Endre søk
Begrens søket
1 - 31 of 31
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Adediran, Gbotemi A.
    et al.
    Department of Soil and Environment Swedish University of Agricultural Sciences Uppsala Sweden;UK Centre for Ecology and Hydrology Wallingford United Kingdom.
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap. Department of Geosciences Swedish Museum of Natural History Stockholm Sweden.
    Gustafsson, Jon‐Petter
    Department of Soil and Environment Swedish University of Agricultural Sciences Uppsala Sweden.
    Significance of phosphorus inclusions and discrete micron‐sized grains of apatite in postglacial forest soils2022Inngår i: European Journal of Soil Science, ISSN 1351-0754, E-ISSN 1365-2389, Vol. 73, nr 5, artikkel-id e13310Artikkel i tidsskrift (Fagfellevurdert)
  • 2. Andersson, Joel B.H.
    et al.
    Logan, Leslie
    Martinsson, Olof
    Chew, David
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap. Department of Geosciences Swedish Museum of Natural History Stockholm Sweden.
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kampmann, Tobias C.
    Bauer, Tobias E.
    U-Pb zircon-titanite-apatite age constraints on basin development and basin inversion in the Kiruna mining district, Sweden2022Inngår i: Precambrian Research, ISSN 0301-9268, E-ISSN 1872-7433, Vol. 372, s. 106613-106613, artikkel-id 106613Artikkel i tidsskrift (Fagfellevurdert)
  • 3. Barnes, Christopher J.
    et al.
    Bukała, Michał
    Callegari, Riccardo
    Walczak, Katarzyna
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap. Department of Geosciences Swedish Museum of Natural History Stockholm Sweden.
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Majka, Jarosław
    Zircon and monazite reveal late Cambrian/early Ordovician partial melting of the Central Seve Nappe Complex, Scandinavian Caledonides2022Inngår i: Contributions to Mineralogy and Petrology, ISSN 0010-7999, E-ISSN 1432-0967, Vol. 177, nr 9, artikkel-id 92Artikkel i tidsskrift (Fagfellevurdert)
  • 4. Barnes, Christopher J..
    et al.
    Majka, Jarek
    Jeanneret, Pauline
    Ziemniak, Grzegorz
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kośmińska, Karolina
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Schneider, D.A.
    Using Th-U-Pb geochronology to extract crystallization ages of Paleozoic metamorphic monazite contaminated by initial Pb2021Inngår i: Chemical Geology, ISSN 0009-2541, E-ISSN 1872-6836, Vol. 582, s. 120450-120450, artikkel-id 120450Artikkel i tidsskrift (Fagfellevurdert)
  • 5.
    Billström, Kjell
    et al.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Broman, Curt
    Larsson, Alfred
    Schersten, Anders
    Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Sandstone-hosted Pb-Zn deposits along the margin of the Scandinavian Caledonides and their possible relationship with nearby Pb-Zn vein mineralisation2020Inngår i: Ore Geology Reviews, ISSN 0169-1368, E-ISSN 1872-7360Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Numerous sandstone-hosted Pb-Zn deposits occur along the present-day erosional front of the eastern Scandinavian Caledonides. The largest deposit is Laisvall (64.3 Mt at 4.0% Pb, 0.6% Zn and 9.0g/t Ag) and since mineralisations generally share similar characteristics (reminding of both SEDEX and MVT-style) the term Laisvall-type has often been used. Typically, mineralised zones occur along sedimentary bedding and consist of disseminated galena and sphalerite and lesser amounts of calcite, fluorite, baryte, pyrite and sericite forming a cement that fill interstitial pores in Neoproterozoic/Eocambrian (e.g. Laisvall) to Cambrian (e.g. Vassbo) sandstones.

    Deposits occur both in autochtonous and allochtonous sedimentary rocks, and a broad consensus exists about their epigenetic nature, their spatial relationships to syn-sedimentary faults and that ore fluids have scavenged metals from the crystalline basement. However, the detailed ore depositional history and the timing of ore deposition have remained more controversial. New analyses aimed to complement earlier Rb-Sr data (crush-leach technique using sphalerite) fail to support a published three-point isochron age of 467±5 Ma. This is probably due to syn-ore mixing between fluids carrying isotopically variable strontium and inherited problems to analyse sphalerite grains that strictly were deposited from a single ore pulse. Tentatively, strontium in the ores originate from a mix of components derived from the basement, seawater and the local sedimentary host sequences. The lead component has highly radiogenic compositions, and data define sub-parallel linear arrays interpreted to essentially represent mixing of isotopically different types of lead released from regional basement rocks.

    There are obvious similarities when comparing features of deposits representing two Pb-Zn ore styles, the sandstone-hosted dissemination and the fracture-controlled mineralisation in the granite-dominated basement occurring further east of the Caledonian margin. These include low temperature brines responsible for mineral deposition, the mineralogy and the nature of Rb-Sr and Pb isotope data. We suggest that these types of mineralisation have a common origin and time of emplacement, but it is elusive to propose a well-constrained age. Nonetheless, field observations and other evidence suggest that ore formation is due to large-scale fluid flow triggered by the transition from an extensional to compressional tectonic setting at about 500 Ma. Connected to this mid-Cambrian stage was the development of syn-sedimentary faults and fractures in the basement and in overlying consolidated sandstones. 

  • 6. Boethius, Adam
    et al.
    Ahlström, Torbjörn
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kjällquist, Mathilda
    Larsson, Lars
    Assessing laser ablation multi-collector inductively coupled plasma mass spectrometry as a tool to study archaeological and modern human mobility through strontium isotope analyses of tooth enamel2022Inngår i: Archaeological and Anthropological Sciences, ISSN 1866-9557, E-ISSN 1866-9565, Vol. 14, nr 5, artikkel-id 97Artikkel i tidsskrift (Fagfellevurdert)
  • 7. Boethius, Adam
    et al.
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Robson, Harry K.
    Mesolithic Scandinavian foraging patterns and hunting grounds targeted through laser ablation derived 87Sr/86Sr ratios at the Early-Mid Holocene site of Huseby Klev on the west coast of Sweden2022Inngår i: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 293, s. 107697-107697, artikkel-id 107697Artikkel i tidsskrift (Fagfellevurdert)
  • 8. Boethius, Adam
    et al.
    Kjällquist, Mathilda
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Ahlström, Torbjörn
    Larsson, Lars
    Diachronic forager mobility: untangling the Stone Age movement patterns at the sites Norje Sunnansund, Skateholm and Västerbjers through strontium isotope ratio analysis by laser ablation2022Inngår i: Archaeological and Anthropological Sciences, ISSN 1866-9557, E-ISSN 1866-9565, Vol. 14, nr 9, artikkel-id 176Artikkel i tidsskrift (Fagfellevurdert)
  • 9. Boethius, Adam
    et al.
    Kjällquist, Mathilda
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Ahlström, Torbjörn
    Larsson, Lars
    Early Holocene Scandinavian foragers on a journey to affluence: Mesolithic fish exploitation, seasonal abundance and storage investigated through strontium isotope ratios by laser ablation (LA‐MC-ICP‐MS)2021Inngår i: PLOS ONE, E-ISSN 1932-6203, Vol. 16, nr 1, s. e0245222-e0245222Artikkel i tidsskrift (Fagfellevurdert)
  • 10. Caton, Summer A.
    et al.
    Smit, Matthijs A.
    Emo, Robert B.
    Musiyachenko, Kira A.
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap. Department of Geosciences Swedish Museum of Natural History Stockholm Sweden.
    Scherstén, Anders
    Halla, Jaana
    Bleeker, Wouter
    Hoffmann, J. Elis
    Pandey, Om Prakash
    Ravindran, Arathy
    Maltese, Alessandro
    Mezger, Klaus
    Evolution of the sources of TTG and associated rocks during the Archean from in-situ 87Sr/86Sr isotope analysis of apatite by LA-MC-ICPMS2022Inngår i: Lithos, ISSN 0024-4937, E-ISSN 1872-6143, Vol. 428-429, s. 106830-106830, artikkel-id 106830Artikkel i tidsskrift (Fagfellevurdert)
  • 11. Chatterjee, Sukalpa
    et al.
    Mezger, Klaus
    Pandey, Om Prakash
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hofer, Alina
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap. Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden.
    The Singhbhum Craton (India) records a billion year of continental crust formation and modification2023Inngår i: Chemical Geology, ISSN 0009-2541, E-ISSN 1872-6836, Vol. 641, s. 121772-121772, artikkel-id 121772Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The petrogenesis of continental crust from its ultimate mantle source can be reconstructed from the element abundances and radiogenic isotope compositions of ideally pristine igneous rocks. The initial isotope compositions of igneous rocks provide geochemical constraints on the age, composition and evolution of their source(s). Determining initial isotope ratios for rock samples can be challenging, especially in rocks with a long and protracted thermal history. The Rb-Sr system is highly sensitive to parent-daughter element fractionation during magma differentiation. This makes the Rb-Sr isotope systematics ideal to trace the precursor composition of Archean felsic crust and constrain the time of element fractionation during the formation and subsequent modification of continental crust. Initial isotope compositions can be obtained directly from minerals that strongly prefer the daughter element and effectively exclude the parent element of the radio-isotope system of interest. Apatite, having a near zero Rb/Sr ratio, is ideal for preserving its initial 87Sr/86Sr and zircon records initial 176Hf/177Hf compositions. Combined modelling of Sr and Hf isotope data from granitoids of the Archean Singhbhum Craton, indicates that the older Paleoarchean granitoids, emplaced between 3.53 Ga and 3.44 Ga, were derived from a mafic precursor (∼52–54 wt% SiO2) sourced from a depleted mantle at ∼3.71 Ga. Initial 87Sr/86Sr isotope signatures of matrix apatite and apatite inclusions in zircon from the younger Paleoarchean granitoids (3.4–3.2 Ga) of the Singhbhum Craton indicate these younger granitoids were produced by mixing of magma generated from an older mafic source and partial melts derived from the older granitoids. The combined Sr-Hf isotope modelling links the timing of mantle extraction of the precursor material for Paleoarchean Singhbhum granitoids with a known mafic crust extraction event at ∼3.71 Ga. In combination, the new Sr isotope data from apatite combined with whole rock and zircon Hf isotope data from the literature reveal a ∼1 Ga protracted crustal growth and differentiation history of the nucleus of the Singhbhum Craton. By combining radio-isotope systems like 87Rb-87Sr and 176Lu-176Hf, the petrogenesis of Archean felsic crust from the extraction of mafic material from the mantle to reworking in an orogenic cycle to emplacement can be reconstructed. This approach can be applied to other greenstone-gneiss terranes to quantify the spatio-temporal and compositional evolution of voluminous felsic crust and the formation of cratons in the Archean.

  • 12. Cutts, Jamie
    et al.
    Smit, Matthijs
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Two‐Stage Cooling and Exhumation of Deeply Subducted Continents2019Inngår i: Tectonics, ISSN 0278-7407, E-ISSN 1944-9194Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The burial and exhumation of continental crust during collisional orogeny exert a strong controlon the dynamics of mountain belts and plateaus. Constraining the rates and style of exhumation of deeply buried crust has proven difficult due to complexities in the local geology and thermochronometric methods typically used. To advance this field, we applied trace‐element and U‐Pb laser ablation inductively coupled plasma mass spectrometry analyses to rutile from eclogite and amphibolite samples from the Western Gneiss Complex of Norway—an archetypal continental (ultra)high‐pressure (UHP) terrane. Peak temperature and timing of midcrustal cooling were constrained for samples collected along a subduction‐ and exhumation‐parallel transect, using Zr‐in‐rutile thermometry and U‐Pb rutile geochronology, respectively. Peak temperatures decrease from 830 °C in the UHP domain to 730 °C at the UHP‐HP transition, remain constant at 730 °C across most of the terrane, and decrease to 620 °C at the eclogite‐out boundary. U‐Pb results show that most of the terrane cooled through 500 °C at 380–375 Ma except for the lowest grade region, where cooling occurred approximately 20 million years earlier. The results indicate that exhumation was a two stage process, involving (1) flexural rebound and slab flattening at depth combined with foreland‐directed extrusion, followed by (2) synchronous cooling below 500 °C across the, by then, largely flat‐lying Western Gneiss Complex. The latter implies and requires relatively homogeneous mass removal across a large area, consistent with erosion of an overlying orogenic plateau. The Caledonides were at near‐equatorial latitudes at the time. A Caledonian paleo‐plateau thus may represent a so far unrecognized factor in Devonian and Carboniferous atmospheric circulation and climate forcing.

  • 13.
    Drake, Henrik
    et al.
    Linnaeus University, Kalmar.
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Using 87Sr/86Sr LA-MC-ICP-MS Transects within Modern and Ancient Calcite Crystals to Determine Fluid Flow Events in Deep Granite Fractures2020Inngår i: Geosciences, Vol. 10, s. 1-23, artikkel-id 345Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The strontium isotope signature (87Sr/86Sr) of calcite precipitated in rock fractures and faults is a frequently used tool to trace paleofluid flow. However, bedrock fracture networks, such as in Precambrian cratons, have often undergone multiple fracture reactivations resulting in complex sequences of fracture mineral infillings. This includes numerous discrete calcite crystal overgrowths. Conventional 87Sr/86Sr analysis of dissolved bulk samples of such crystals is not feasible as they will result in mixed signatures of several growth zonations. In addition, the zonations are too fine-grained for sub-sampling using micro-drilling. Here, we apply high spatial resolution 87Sr/86Sr spot analysis(80 um) in transects through zoned calcite crystals in deep Paleoproterozoic granitoid fractures using laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) to trace discrete signs of paleofluid flow events. We compare the outermost calcite growth zone with 87Sr/86Sr values of the present-day groundwater sampled in the same boreholes to distinguish potential modern precipitates. We then connect our results to previously reported radiometric dating and C and O isotope signatures to understand the temporal history and physicochemical evolution of fluid flow within the fractures. Comparisons of modern calcite precipitated in a borehole over a period of 17 years with modern waters prove the concept of using 87Sr/86Sr as a marker for fluid origin in this environment and for how 87Sr/86Sr changed during marine water infiltration. Intermittent calcite precipitation over very long time spans is indicated in calcite of the currently open fractures, showing an evolution of 87Sr/86Sr from ~0.705–0.707—a population dated to ~1.43 billion years—to crystal overgrowth values at ~0.715–0.717 that overlap with the present-day groundwater values.This shows that high spatial resolution Sr isotope analysis of fine-scaled growth zonation within single calcite crystals is applicable for tracing episodic fluid flow in fracture networks.

    Fulltekst (pdf)
    Drake et al. 2020
  • 14. Drake, Henrik
    et al.
    Roberts, Nick M. W.
    Reinhardt, Manuel
    Whitehouse, Martin
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Ivarsson, Magnus
    Naturhistoriska riksmuseet, Enheten för paleobiologi.
    Karlsson, Andreas
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Biosignatures of ancient microbial life are present across the igneous crust of the Fennoscandian shield2021Inngår i: Communications Earth & Environment, E-ISSN 2662-4435, Vol. 2, nr 1, artikkel-id 102Artikkel i tidsskrift (Fagfellevurdert)
  • 15. Emo, Robert
    et al.
    Smit, Matthijs
    Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Scherer, Erik
    Sprung, Peter
    Bleeker, Wouter
    Mezger, Klaus
    Evidence for evolved Hadean crust from Sr isotopes in apatite within Eoarchean zircon from the Acasta Gneiss Complex2018Inngår i: Geochimica et Cosmochimica Acta, ISSN 0016-7037, E-ISSN 1872-9533, Vol. 235, s. 450-462Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Current models for the properties of Hadean-Eoarchean crust encompass a full range of possibilities, involving crust that is anywhere from thick and differentiated to thin and mafic. New data are needed to test and refine these models, and, ultimately, to determine how continents were first formed. The Rb-Sr system provides a potentially powerful proxy for crustal evolution and composition. However, this system has thus far been underutilized in studies on early crustal evolution due to its susceptibility to re-equilibration. Overcoming this issue requires new analytical approaches to micro-sample ancient Sr-rich mineral relics that may retain primary Rb-Sr systematics, allowing for the precise and accurate determination of initial 87Sr/86Sr values. In this study, we used a novel application of laser-ablation multi-collector inductively coupled plasma mass spectrometry to determine the Sr isotope composition of apatite inclusions in >3.6 Ga zircon grains from Eoarchean granodiorite gneisses of the Acasta Gneiss Complex, Slave Province, Canada. The 87Rb-corrected 87Sr/86Sr values of these inclusions are largely identical and are distinctly different from values obtained from altered matrix apatite. The inclusion data provide the first direct estimate of initial 87Sr/86Sr for these ancient rocks. Combining this result with information on the protolith and source-extraction age yields estimates for the range of Rb/Sr values, and by extension composition, that the source of these rocks may have had. The data indicate that continental crust containing over 60 wt% of SiO2 was present in the ca. 4.2 Ga source of the Acasta Gneiss Complex. Thus vestiges of evolved crust must have existed within the primitive proto-continents that were present on the Hadean Earth.

  • 16. Glykou, Aikaterini
    et al.
    Eriksson, Gunilla
    Storå, J.
    Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Lidén, Kerstin
    Intra- and inter-tooth variation in strontium isotope ratios from prehistoric seals by laser ablation multi-collector inductively coupled plasma mass spectrometry2018Inngår i: Rapid Communications in Mass Spectrometry, ISSN 0951-4198, E-ISSN 1097-0231, Vol. 32, s. 1215-1224Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Rationale

    Strontium isotope ratios (87Sr/86Sr) in modern‐day marine environments are considered to be homogeneous (~0.7092). However, in the Baltic Sea, the Sr ratios are controlled by mixing seawater and continental drainage from major rivers discharging into the Baltic. This pilot study explores if variations in Sr can be detected in marine mammals from archaeological sites in the Baltic Sea.               

    Methods

    87Sr/86Sr ratios were measured in tooth enamel from three seal species by laser ablation multi‐collector inductively coupled plasma mass spectrometry (LA‐MC‐ICP‐MS). The method enables micro‐sampling of solid materials. This is the first time that the method has been applied to marine samples from archaeological collections.               

    Results

    The analyses showed inter‐tooth 87Sr/86Sr variation suggesting that different ratios can be detected in different regions of the Baltic Sea. Furthermore, the intra‐tooth variation suggests possible different geographic origin or seasonal movement of seals within different regions in the Baltic Sea through their lifetime.               

    Conclusions

    The method was successfully applied to archaeological marine samples showing that: (1) the 87Sr/86Sr ratio in marine environments is not uniform, (2) 87Sr/86Sr differences might reflect differences in ecology and life history of different seal species, and (3) archaeological mobility studies based on 87Sr/86Sr ratios in humans should therefore be evaluated together with diet reconstruction.

    Fulltekst (pdf)
    fulltext
  • 17.
    Grasse, P.
    et al.
    GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany.
    Brezezinski, M.
    Marine Science Institute and the Department of Ecology, Evolution, and Marine Biology & University of California, USA.
    Cardinal, D.
    Sorbonne Universités, Paris, France.
    de Souza, G.F.
    ETH Zurich, Institute of Geochemistry and Petrology, Switzerland.
    Andersson, Per
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Closset, I.
    Sorbonne Universités, Paris, France.
    Cao, Z.
    State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, China.
    Dai, M.
    State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, China.
    Ehlert, C.
    Max Planck Research Group for Marine Isotope Geochemistry, University of Oldenburg, Germany.
    Estrade, N.
    University of British Columbia, Vancouver, British Columbia,.
    Francois, R.
    University of British Columbia, Vancouver, British Columbia,.
    Frank, M.
    GEOMAR, Helmholtz Centre for Ocean Research Kiel, Germany.
    Jiang, G.
    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
    Jones, J.L.
    Marine Science Institute and the Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara USA.
    Kooijman, E.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Liu, Q.
    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
    Lu, D.
    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
    Pahnke, K.
    Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Germany.
    Ponzevera, E.
    Unité de Recherche Géosciences Marines, IFREMER, Brest, France.
    Schmitt, M.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Sun, S.
    Department of Environmental Science and Analytical Chemistry, Stockholm University, Sweden.
    Sutton, J.N.
    Universite de Brest, CNRS, IRD, IFREMER, LEMAR, IUEM, France.
    Thil, F.
    LSCE/IPSL - Laboratoire des Sciences du Climat et de l'Environnement, Gif sur Yvette, France.
    Weis, D.
    University of British Columbia Pacific Center for Isotopic and Geochemical Research, Vancouver, British Columbia,Canada .
    Wetzel, F.
    ETH Zurich, Institute of Geochemistry and Petrology, Switzerland.
    Zhang, A.
    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China.
    Zhang, J.
    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China.
    Zhang, Z.
    State Key Laboratory of Marine Environmental Science,Xiamen University,.
    GEOTRACES Intercalibration of the Stable Silicon Isotope Composition of Dissolved Silicic Acid in Seawater2017Inngår i: Journal of Analytical Atomic Spectrometry, ISSN ISSN 0267-9477, Vol. 32, s. 562-578Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The first inter-calibration study of the stable silicon isotope composition of dissolved silicic acid in seawater, d30Si(OH)4, is presented as a contribution to the international GEOTRACES program. Eleven laboratories from seven countries analyzed two seawater samples from the North Pacific subtropical gyre (Station ALOHA) collected at 300 m and at 1000 m water depth. Sampling depths were chosen to obtain samples with a relatively low (9 mmol L-1, 300 m) and a relatively high (113 mmol L-1, 1000 m) silicic acid concentration as sample preparation differs for low- and high concentration samples. Data for the 1000 m water sample were not normally distributed so the median is used to represent the central tendency for the two samples. Median d30Si(OH)4 values of +1.66‰ for the low-concentration sample and +1.25‰ for the high-concentration sample were obtained. Agreement among laboratories is overall considered very good; however, small but statistically significant differences among the mean isotope values obtained by different laboratories were detected, likely reflecting inter-laboratory differences in chemical preparation including preconcentration and purification methods together with different volumes of seawater analyzed, andthe use of different mass spectrometers including the Neptune MC-ICP-MS (Thermo Fisher™, Germany), the Nu Plasma MC-ICP-MS (Nu Instruments™, Wrexham, UK), and the Finnigan™ (now Thermo Fisher™, Germany) MAT 252 IRMS. Future studies analyzing d30Si(OH)4 in seawater should also analyze and report values for these same two reference waters in order to facilitate comparison of data generated among and within laboratories over time.

    Fulltekst (pdf)
    fulltext
  • 18. Hirst, Catherine
    et al.
    Andersson, Per
    Naturhistoriska riksmuseet, Forskningsavdelningen centralt.
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kutscher, Liselott
    Maximov, Trofim
    Mörth, Carl-Magnus
    Porcelli, Don
    Iron isotopes reveal the sources of Fe-bearing particles and colloids in the Lena River basin2019Inngår i: Geochimica et Cosmochimica Acta, ISSN 0016-7037, E-ISSN 1872-9533Artikkel i tidsskrift (Fagfellevurdert)
  • 19. Kershaw, Jane
    et al.
    Merkel, Stephen W.
    Oravisjärvi, Jani
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    The scale of dirham imports to the Baltic in the ninth century: new evidence from archaeometric analyses of early Viking-Age silver2021Inngår i: Fornvännen, ISSN 0015-7813, E-ISSN 1404-9430, Vol. 116, nr 3, s. 185-204Artikkel i tidsskrift (Fagfellevurdert)
  • 20.
    Matetski, Lagle
    et al.
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Rohtla, Mehis
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Svirgsden, Roland
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Kesler, Martin
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Saks, Lauri
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Taal, Imre
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Hommik, Kristiina
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Paiste, Päärn
    Department of Geology University of Tartu Tartu Estonia.
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap. Department of Geosciences Swedish Museum of Natural History Stockholm Sweden.
    Birzaks, Jānis
    Department of Ecology University of Daugavpils Daugavpils Latvia.
    Saura, Ari
    Natural Resource Institute Finland Helsinki Finland.
    Ziņģis, Mārcis
    Aquaculture Research and Education Centre Institute of Food Safety Animal Health and Environment Fish Farm “Tome” Ķegums Latvia.
    Vaittinen, Matti
    Centre of Economic Development, Transport and the Environment for Southeast Finland Kouvola Finland.
    Vetemaa, Markus
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Variability in stream water chemistry and brown trout ( Salmo trutta L.) parr otolith microchemistry on different spatial scales2021Inngår i: Ecology of Freshwater Fish, ISSN 0906-6691, E-ISSN 1600-0633, Vol. 31, nr 2, s. 438-453Artikkel i tidsskrift (Fagfellevurdert)
  • 21.
    Matetski, Lagle
    et al.
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Rohtla, Mehis
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Svirgsden, Roland
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Kesler, Martin
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Saks, Lauri
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Taal, Imre
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Hommik, Kristiina
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Paiste, Päärn
    Department of Geology University of Tartu Tartu Estonia.
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Birzaks, Jānis
    Department of Ecology University of Daugavpils Daugavpils Latvia.
    Saura, Ari
    Natural Resource Institute Finland Helsinki Finland.
    Ziņģis, Mārcis
    Aquaculture Research and Education Centre Institute of Food Safety Animal Health and Environment, Fish Farm “Tome” Ķegums Latvia.
    Vaittinen, Matti
    Centre of Economic Development, Transport and the Environment for Southeast Finland Kouvola Finland.
    Vetemaa, Markus
    Estonian Marine Institute University of Tartu Tartu Estonia.
    Variability in stream water chemistry and brown trout (Salmo trutta L.) parr otolith microchemistry on different spatial scales2021Inngår i: Ecology of Freshwater Fish, ISSN 0906-6691, E-ISSN 1600-0633Artikkel i tidsskrift (Fagfellevurdert)
  • 22. Piličiauskienė, Giedrė
    et al.
    Kurila, Laurynas
    Simčenka, Edvardas
    Lidén, Kerstin
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap. Department of Geosciences Swedish Museum of Natural History Stockholm Sweden.
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Piličiauskas, Gytis
    The Origin of Late Roman Period–Post-Migration Period Lithuanian Horses2022Inngår i: Heritage, E-ISSN 2571-9408, Vol. 5, nr 1, s. 332-352Artikkel i tidsskrift (Fagfellevurdert)
  • 23. Ravindran, Arathy
    et al.
    Mezger, Klaus
    Balakrishnan, S
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Berndt, Jasper
    Initial 87Sr/86Sr as a sensitive tracer of Archaean crust-mantle evolution: Constraints from igneous and sedimentary rocks in the western Dharwar Craton, India2020Inngår i: Precambrian Research, ISSN 0301-9268, E-ISSN 1872-7433, Vol. 337, s. 1-15, artikkel-id 105523Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Among the rocky planets of the solar system only the Earth has “granitic” continental crust. The timing and processes involved in the formation of Earth’s first extensive crust is still enigmatic. The chemical and isotope compositions of ancient crustal rocks preserve a record of their genesis. The Rb-Sr system proves to be an efficient proxy for the reconstruction of crust-mantle evolution since it can bring together information from seawater as preserved in chemical sedimentary rocks and information from magmatic rocks that can trace the time and extent of crust formation and concomitant mantle depletion during the Archaean eon. The Dharwar Craton in India preserves a suite of metamorphosed igneous and sedimentary rocks that record its early crustal evolution. To overcome the susceptibility for resetting and the difficulty in determining initial 87Sr/86Sr, the minerals barite and apatite are used to obtain precise and accurate 87Sr/86Sr, because these minerals preferentially incorporate Sr and exclude Rb and preserve the initial Sr isotope compositions at the time of their formation. Initial 87Sr/86Sr of apatite were obtained in situ using Laser Ablation Multi-Collector Inductively Coupled Plasma Mass Spectrometry. The robustness and only minor dispersion of the isotope ratios demonstratethe capability of matrix apatites in preserving initial Sr ratios. The least radiogenic value is used as the best estimate for the initial 87Sr/86Sr. The 87Sr/86Sr ratios of apatite from igneous rocks that formed from 3.5 Ga to 2.6 Ga constrain the Rb/Sr of the source over the whole time-span. A comparison of the Sr isotopes between seawater-derived barite and initial Sr isotope ratios in apatite from igneous rocks reveals that significant mafic to intermediate crust had formed by 3.2 Ga. Studying the entire Archaean time window, a dominantly mafic crust was the main source for the granitoid rocks in the Dharwar Craton from 3.5 to 3.1 Ga, whereas the rocks from 2.9t o 2.7 Ga were extracted dominantly from the depleted mantle.

  • 24. Ravindran, Arathy
    et al.
    Mezger, Klaus
    Balakrishnan, Srinivasan
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Berndt, Jasper
    Initial 87Sr/86Sr as a sensitive tracer of Archaean crust-mantle evolution: constraints from igneous and sedimentary rocks in the western Dharwar Craton, India2019Inngår i: Precambrian Research, ISSN 0301-9268, E-ISSN 1872-7433Artikkel i tidsskrift (Fagfellevurdert)
  • 25. Rohtla, Mehis
    et al.
    Silm, Maidu
    Tulonen, Jouni
    Paiste, Päärn
    Wickström, Håkan
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Vaino, Väino
    Eschbaum, Redik
    Saks, Lauri
    Verliin, Aare
    Vetemaa, Markus
    Conservation restocking of the imperilled European eel does not necessarily equal conservation2020Inngår i: ICES Journal of Marine Science, ISSN 1054-3139, E-ISSN 1095-9289, s. 1-11Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    To stop the decline of the European eel population, one of the measures taken is translocating eels for restocking, despite its conservational value being largely unknown. We aimed to contribute to this knowledge gap by (i) investigating the origin of eels caught in coastal waters of Estonia and Finland using otolith microchemistry and (ii) directly estimating restocked eel escapement from Narva River Basin District (NRBD), which is part of the primary Eel Management Unit in Estonia. In Estonia, 74% of the sampled eels (n=140) were natural recruits and 26% were restocked. In Finland, 27% of the sampled eels (n=235) were natural recruits and 73% were restocked. Only 1% of all the coastally collected eels were originally restocked to NRBD. These new data together with the reported commercial landings from the escapement route conflict with the current silver eel escapement estimation for NRBD and question the accuracy and value of such indirect calculations compiled for most Eel Management Units throughout the European Union. It is concluded that restocking eels to freshwaters may be futile as a conservation measure in some situations, and better escapement is likely achieved in restocking eels to coastal waters or undammed freshwater systems with a direct connection to the sea.

  • 26. Sun, Xiaole
    et al.
    Mörth, Carl-Magnus
    Porcelli, Don
    Kutscher, Liselott
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Hirst, Catherine
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Murphy, Melissa J.
    Maximov, Trofim
    Petrov, Roman E.
    Humborg, Christoph
    Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Andersson, Per
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Stable silicon isotopic compositions of the Lena River and its tributaries: Implications for silicon delivery to the Arctic Ocean2018Inngår i: Geochimica et Cosmochimica Acta, ISSN 0016-7037, E-ISSN 1872-9533, Vol. 241, s. 120-133Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Silicon isotope values (d30SiDSi) of dissolved silicon (DSi) have been analyzed in the Lena River and its tributaries, one ofthe largest Arctic watersheds in the world. The geographical and temporal variations of d30SiDSi range from +0.39 to +1.86‰with DSi concentrations from 34 to 121 lM. No obvious patterns of DSi concentrations and d30SiDSi values were observedalong over 200 km of the two major tributaries, the Viliui and Aldan Rivers. In summer, the variations of DSi concentrationsand d30SiDSi values in the water are either caused by biological uptake by higher plants and phytoplankton or by mixing ofwater masses carrying different DSi concentrations and d30SiDSi values. DSi in tributaries from the Verkhoyansk MountainRange seems to be associated with secondary clay formation that increased the d30SiDSi values, while terrestrial biological productionis likely more prevalent in controlling d30SiDSi values in Central Siberian Plateau and Lena Amganski Inter-RiverArea. In winter, when soils were frozen, the d30SiDSi values in the river appeared to be controlled by weathering and clay formationin deep intrapermafrost groundwater. During the spring flood, dissolved silicate materials and phytoliths were flushedfrom the upper thawed soils into rivers, which reset d30SiDSi values to the values observed prior to the biological bloom insummer. The results indicate that the Si isotope values reflect the changing processes controlling Si outputs to the Lena Riverand to the Arctic Ocean between seasons. The annual average d30SiDSi value of the Lena Si flux is calculated to be +0.86± 0.3‰ using measured d30SiDSi values from each season. Combined with the estimate of +1.6 ± 0.25‰ for the Yenisey River,an updated d30SiDSi value of the major river Si inputs to the Arctic Ocean is estimated to be +1.3 ± 0.3‰. This value isexpected to shift towards higher values in the future because of the impacts from a variety of biological and geochemicalprocesses and sources under global warming.

  • 27. Tillberg, Mikael
    et al.
    Ivarsson, Magnus
    Naturhistoriska riksmuseet, Enheten för paleobiologi.
    Drake, Henrik
    Whitehouse, Martin
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Re-Evaluating the Age of Deep Biosphere Fossils in the Lockne Impact Structure2019Inngår i: GeosciencesArtikkel i tidsskrift (Fagfellevurdert)
  • 28. Tual, Lorraine
    et al.
    Smit, Matthijs A.
    Cutts, Jamie
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap. Department of Geosciences Swedish Museum of Natural History Stockholm Sweden.
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Majka, Jarosław
    Foulds, Ian
    Rapid, paced metamorphism of blueschists (Syros, Greece) from laser-based zoned Lu-Hf garnet chronology and LA-ICPMS trace element mapping2022Inngår i: Chemical Geology, ISSN 0009-2541, E-ISSN 1872-6836, Vol. 607, s. 121003-121003, artikkel-id 121003Artikkel i tidsskrift (Fagfellevurdert)
  • 29.
    Tual, Lorraine
    et al.
    Department of Geosciences Swedish Museum of Natural History Stockholm Sweden;Department of Earth, Ocean, and Atmospheric Sciences University of British Columbia Vancouver Canada.
    Smit, Matthijs A.
    Department of Earth, Ocean, and Atmospheric Sciences University of British Columbia Vancouver Canada.
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap. Department of Geosciences Swedish Museum of Natural History Stockholm Sweden.
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Ratschbacher, Lothar
    Geologie TU Bergakademie Freiberg Freiberg Germany.
    Garnet, zircon, and monazite age and REE signatures in (ultra)high‐temperature and high‐pressure rocks: Examples from the Caledonides and the Pamir2022Inngår i: Journal of Metamorphic Geology, ISSN 0263-4929, E-ISSN 1525-1314, Vol. 40, nr 8, s. 1321-1346Artikkel i tidsskrift (Fagfellevurdert)
  • 30. Tuoriniemi, Jani
    et al.
    Holbrook, Timothy R
    Cornelis, Geert
    Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Stärk, Hans-Joachim
    Kooijman, Ellen
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Wagner, Stephan
    Correction: Measurement of number concentrations and sizes of Au nano-particles spiked into soil by laser ablation single particle ICPMS2020Annet (Annet vitenskapelig)
    Abstract [en]

    The authors regret the omission of one of the authors, Ellen Kooijman, from the original manuscript. The corrected list of authors and affiliations for this paper is as shown above.

    The authors also regret the omission of the following sentence from the acknowledgements section: This is Vegacenter publication number #031.

    The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.

  • 31. Walczak, Katarzyna
    et al.
    Ziemniak, Grzegorz
    Barnes, Christopher
    Callegari, Riccardo
    Bukała, Michał
    Kielman-Schmitt, Melanie
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Zagórska, Anna
    Majka, Jarosław
    Late Neoproterozoic extended continental margin development recorded by the Seve Nappe Complex of the northern Scandinavian Caledonides2022Inngår i: Lithos, ISSN 0024-4937, E-ISSN 1872-6143, Vol. 416-417, s. 106640-106640, artikkel-id 106640Artikkel i tidsskrift (Fagfellevurdert)
1 - 31 of 31
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf