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  • 1.
    Claeson,, Dick
    Sveriges geologiska undersökning.
    Persson, Per-Olof
    Swedish Museum of Natural History, Department of Geology.
    Morris, George
    Sveriges geologiska undersökning.
    U-Pb zircon age of host quartz trachyte at the Kallak iron ore deposit east of Björkholmen, map sheet 27I Tjåmotis SO, Norrbotten County2018Report (Other academic)
  • 2.
    Claeson, Dick
    Sveriges geologiska undersökning.
    Persson, Per-Olof
    Swedish Museum of Natural History, Department of Geology.
    U-Pb zircon age of metagranite with relict phenocryst texture at Linavare, map sheet 27K Nattavaara, Norbotten county2018Report (Other academic)
    Abstract [en]

    Norrbotten, Sweden is a key area of Europe for future exploration and mining. To establish age relations for magmatic activity and metamorphic overprinting in this area, the sampled rock was selected (Fig. 1, 2, 21). This rock occurs at Linavare as mega-xenoliths of strongly deformed, foliated, recrystallised and low-radiation metagranite in massive subvolcanic granite to rhyolite porphyry that was age determined to 1870 ± 6 Ma, giving a lower age of the high-grade metamorphic event (this issue). The age of the regional metamorphic event may be deduced from the age of these two rocks, occurring between their igneous crystallisation ages. Determine the magmatic age of the metagranite is the main aim and if the zircon display metamorphic rims or overgrowths, these should be studied too.

  • 3.
    Claeson,, Dick
    Sveriges geologiska undersökning.
    Persson, Per-Olof
    Swedish Museum of Natural History, Department of Geology.
    Morris, George
    Sveriges geologiska undersökning.
    U-Pb zircon age of the host granite of the REE and Mo (U, Th, Nb, Ta) mineralisation at Tåresåive, map sheet 27J Porjus SV, Norrbotten County2018Report (Other academic)
  • 4.
    Kathol, Benno
    Sveriges geologiska undersökning.
    Persson, Per-Olof
    Swedish Museum of Natural History, Department of Geology.
    Morris, George
    Sveriges geologiska undersökning.
    U–Pb zircon age of a granodioritic gneiss from Rimokojan at Stora Luleälven, Norrbotten County, northern Sweden2018Report (Other academic)
    Abstract [en]

    A granodioritic gneiss from Rimokojan at Stora Luleälven north of Jokkmokk in the central part of Norrbotten County, has been dated using U–Pb SIMS analyses of zircon. The sampled gneiss occurs within a massif of granodioric to tonalitic gneisses together with strongly deformed basic dykes and intrusions of almost undeformed gabbro to diorite of the Haparanda suite. This rock association occurs in the southern part of a distinct magnetic anomaly in the area of the Muddus National Park. Analyses of oscillatory zoned zircon domains from the Rimokojan gneiss sample yielded a weighted average 207Pb/206Pb age of 2668 ± 3 Ma (2σ) which is interpreted to date the protolith at c. 2.67 Ga. This figure is similar to other age determinations of Archaean rocks in southeastern Norrbotten County (2.70–2.64 Ga). Field relations suggest that the gneiss protolith has been deformed during at least two different deformational events which both predate the emplacement of the 1.91–1.87 Ga Haparanda suite. Two analyses of low Th/U, cathodoluminescence (CL)-dark unzoned zircon rims from the same sample are interpreted to date a metamorphic event at c. 2.61 Ga.

  • 5.
    Ling, Johan
    et al.
    University of Gothenburg.
    Stos-Gale, Zophia
    Grandin, Lena
    Billström, Kjell
    Swedish Museum of Natural History, Department of Geology.
    Hjärthner-Holdar, Eva
    Persson, Per-Olof
    Moving metals II: Provenancing Scandinavian Bronze Age artefacts by lead isotope and elemental analyses2014In: Journal of Archaeological Science, ISSN 0305-4403, Vol. 41, p. 106-132Article in journal (Refereed)
    Abstract [en]

    The first part of this research published previously proved without doubt that the metals dated to the Nordic Bronze Age found in Sweden were not smelted from the local copper ores. In this second part we present a detailed interpretation of these analytical data with the aim to identify the ore sources from which these metals originated. The interpretation of lead isotope and chemical data of 71 Swedish Bronze Age metals is based on the direct comparisons between the lead isotope data and geochemistry of ore deposits that are known to have produced copper in the Bronze Age. The presented interpretations of chemical and lead isotope analyses of Swedish metals dated to the Nordic Bronze Age are surprising and bring some information not known from previous work. Apart from a steady supply of copper from the Alpine ores in the North Tyrol, the main sources of copper seem to be ores from the Iberian Peninsula and Sardinia. Thus from the results presented here a new complex picture emerges of possible connectivities and flows in the Bronze Age between Scandinavia and Europe.

  • 6.
    Lynch, Edward
    et al.
    Sveriges geologiska undersökning.
    Bauer, Tobias
    Luleå University of Technology.
    Jörnberger, Johan
    Sveriges geologiska undersökning.
    Smarlus, Zmar
    Luleå University of Technology.
    Morris, George
    Sveriges geologiska undersökning.
    Persson, Per-Olof
    Swedish Museum of Natural History, Department of Geology.
    Petrological and structural character of c. 1.88 Ga meta-volcanosedimentary rocks hosting iron oxide-copper-gold and related mineralisation in the Nautanen–Aitik area, northern Sweden2018In: SGU Rapporter och meddelanden, ISSN 0349-2176, Vol. 141, p. 107-150Article in journal (Refereed)
    Abstract [en]

    The petrological and deformation characteristics of a Palaeoproterozoic meta-volcanosedimentary sequence in the Nautanen–Aitik area (near Gällivare, northern Sweden) are presented. The investigated sequence (part of the Muorjevaara group) predominantly comprises metavolcaniclastic rocks displaying variable grain size, textural and syn-depositional features (e.g. grading, cross-laminae, compositional banding). Locally, poorly sorted agglomerate-like horizons with coarser clasts (lapilli-to block-size) occur. Interbedded sections of mainly fine-grained, volcanogenic (epiclastic) metasedimentary rocks contain syn-depositional features that suggest a sub-aqueous, relatively shallow depositional environment. Locally preserved cross-laminae in this unit provide evidence of way-up and paleocurrent directions. Intercalations of pelite, mica schist and amphibolitic schist also occur throughout the sequence. In general, least altered samples indicate a predominantly intermediate (basaltic andesitic to andesitic), calc-alkaline composition for the sequence.

    U-Pb SIMS zircon dating of a meta-andesite horizon, intercalated within the sequence, has yielded a precise U-Pb concordia age of 1 878 ± 7 Ma (2σ, n = 12). This date constrains the timing of intermediate volcanism and the deposition of syn-volcanic epiclastic material. By inference, it also provides an estimate for the age of Muorjevaara group rocks hosting the Nautanen Cu-Au and Aitik Cu-Au-Ag deposits. When combined with lithogeochemical signatures, the new age also confirms a genetic link between the metavolcaniclastic package and gabbroic to dioritic intrusions in the area (e.g. the c. 1.88 Ga Aitik stock). Additionally, several zircon cores record 207Pb/206Pb apparent ages between c. 1.90 and 1.89 Ga, suggesting inheritance of marginally older volcanic ± plutonic material not exposed at the present erosion level.

    The Nautanen–Aitik area contains the roughly north-northwest-trending Nautanen deformation zone (NDZ), a major composite brittle-ductile structure hosting hydrothermal iron oxide-Cu-Au (IOCG)-style mineralisation (e.g. the Nautanen deposit). Here, the bedrock is relatively intensely altered and sheared, and has been transposed into a sub-parallel high-strain zone predominantly consisting of a composite planar penetrative fabric. Outside the high-strain zone, relatively large-scale approximately north-northwest-aligned folds and discordant brittle structures occur. Magnetic susceptibility and VLF-resistivity modelling of the NDZ confirm that composite planar structures mainly dip steeply to the west-southwest and continue at depth.

  • 7.
    Lynch, Edward
    et al.
    Sveriges geologiska undersökning.
    Hellström, Fredrik
    Sveriges geologiska undersökning.
    Huhma, Hannu
    Geological survey of Finland.
    Jörnberger, Johan
    Sveriges geologiska undersökning.
    Persson, Per-Olof
    Swedish Museum of Natural History, Department of Geology.
    Morris, George
    Sveriges geologiska undersökning.
    Geology, lithostratigraphy and petrogenesis of c. 2.14 Ga greenstones in the Nunasvaara and Masugnsbyn areas, northernmost Sweden2018In: SGU Rapporter och meddelanden, ISSN 0349-2176, Vol. 141, p. 19-77Article in journal (Refereed)
    Abstract [en]

    Two Palaeoproterozoic greenstone successions in the Nunasvaara and Masugnsbyn areas of north-central Norrbotten (northernmost Sweden) have been investigated to (1) characterise their primary depositional features; (2) establish lithostratigraphic correlations between both areas; and (3) gain insights into the petrogenesis of greenstone-type volcano-sedimentary successions in this sector of the Fennoscandian Shield.

    In the Nunasvaara area (Vittangi greenstone group), a partly conformable, polydeformed, approxi­mately 2.4 km thick greenstone sequence mainly consists of basaltic (tholeiitic) metavolcanic and metavolcaniclastic rocks (amygdaloidal lava, laminated tuff). Intercalated metasedimentary units include graphite-bearing black schist, and pelite. The uppermost part consists of amphibolitic pelite with intercalated metacarbonate layers and rare meta-ironstone, metachert and meta-ultrabasic horizons. Numerous metadoleritic sills occur throughout the package.

    In the Masugnsbyn area (Veikkavaara greenstone group) a relatively conformable approximately 3.4 km thick greenstone sequence displays lithological, geochemical and geophysical characteristics similar to that at Nunasvaara. This succession consists of a dominant basaltic metatuff sequence over­lain by metasedimentary units towards the top (e.g. meta-ironstone, metachert, amphibolitic schist, calcitic and dolomitic marbles). Minor metadolerite sills occur in the metatuffs. Near the base of the metatuff package, a graphitic black schist horizon occupies a similar stratigraphic position to a prom­inent black schist layer at Nunasvaara (here named the Nunasvaara member). This unit is a key mark­er horizon providing lateral correlation between both successions and also acts as a useful strain marker for reconstructing deformational events.

    Both greenstone successions record the effects of overprinting syn-to late-orogenic (Svecokarelian) tectonothermal events. These include complex, polyphase ductile deformation (D1 to D3 events at Nunasvaara, forming the Nunasvaara dome), peak amphibolite facies metamorphism, metasomatic-hydrothermal alteration and late-stage retrogression and brittle faulting (composite D4 at Nunasvaara). Locally, these overprinting processes formed metamorphic graphite, skarn-related Fe ± Cu and hydro­thermal Cu ± Pb ± Mo mineralisation.

    U-Pb SIMS zircon dating of a metadolerite dyke from Nunasvaara and a metadolerite sill from Masugnsbyn have yielded mean weighted 207Pb/206Pb ages of 2 144 ±5 Ma (2σ, n = 10) and 2 139 ±4 Ma (2σ, n = 5) Ma, respectively. These precise dates constrain the timing of hypabyssal mafic magmatism, provide a minimum age for the deposition of the volcanic and sedimentary rocks, and identify a new approximetly 2.14 Ga episode of tholeiitic magmatism in this sector of the Fennoscandian Shield. Whole-rock initial εNd values for greenstone meta-igneous units range from +0.4 to +4.0 at Nunasvaara (n = 11) and +0.4 to +3.7 at Masugnsbyn (n = 7). These data indicate a juvenile depleted to partly enriched mantle (asthenospheric or lithospheric) as a major source of the tholeiitic melts. Corresponding trace element systematics have enriched mid-ocean ridge (E-MORB)-type signatures, and indicate minor assimilation of Archaean continental crust (i.e. Norrbotten craton) during magma ascent and storage. Overall, the combined geological, geochemical and isotopic characteristics of the greenstones are consistent with protolith formation within an incipient oceanic basin (epieric Norrbotten Seaway) during approximetly 2.14 Ga rifting and sagging of the Norrbotten craton.

  • 8.
    Martinsson, Olof
    et al.
    Luleå University of Technology.
    Bergman, Stefan
    Sveriges geologiska undersökning.
    Persson, Per-Olof
    Swedish Museum of Natural History, Department of Geology.
    Hellström, Fredrik
    Sveriges geologiska undersökning.
    Age and character of late-Svecokarelian monzonitic intrusions in northeastern Norrbotten, northern Sweden2018In: SGU Rapporter och meddelanden, ISSN 0349-2176, Vol. 141, p. 381-400Article in journal (Refereed)
    Abstract [en]

    Palaeoproterozoic magmatism in northern Norrbotten shows a complex evolution, with several different plutonic suites ranging in age 1.93–1.70 Ga. Here we present data for three monzonitic intrusions from different parts of the area. They are petrographically and chemically similar, consisting mainly of perthite, augite and orthopyroxene, with megacrysts of poikilitic biotite as a characteristic minor component, and with high Sr and Ba. The intrusions have been dated at 1.80 Ga and may be part of a more extensive magmatic event in northern Sweden, including other chemically similar monzonitic and gabbroic intrusions, which often occur as ring dykes at the Merasjärvi gravity high (MGH) in northeastern Norrbotten. The monzonitic intrusions have A-type signatures and chemical characteristics overlapping those of rocks in arc and within-plate settings. These intrusions may thus have formed in either a back arc setting related to eastward subduction associated with the Transscandinavian Igneous Belt further west (TIB 1), or through a separate igneous event caused by a mantle plume.

  • 9.
    Martinsson, Olof
    et al.
    Luleå Tekniska Universitet.
    Bergman, Stefan
    SGU.
    Persson, Per-Olof
    Swedish Museum of Natural History, Department of Geology.
    Schöberg, Hans
    Swedish Museum of Natural History, Department of Geology.
    Billström, Kjell
    Swedish Museum of Natural History, Department of Geology.
    Shumlyanskyy, Leonid
    Stratigraphy and ages of Palaeoproterozoic metavolcanic and metasedimentary rocks at Käymäjärvi, northern Sweden2018In: Swedish Geological Survey, Rapporter och meddelanden, Vol. 141, p. 79-106Article in journal (Refereed)
  • 10. Melheim, Lene
    et al.
    Grandin, Lena
    Persson, Per-Olof
    Swedish Museum of Natural History, Department of Geology.
    Billström, Kjell
    Swedish Museum of Natural History, Department of Geology.
    Stoz-Gale, Zofia
    Williams, A.
    Angelini, I.
    Canovaro, C.
    Hjärthner-Holdar, Eva
    Kristiansen, K.
    Possible origins for copper in Bronze Age Denmark based on lead isotopes and geochemistry2018In: Journal of Archaeological Science, ISSN 0305-4403, E-ISSN 1095-9238, Vol. 96, p. 85-105Article in journal (Refereed)
  • 11.
    Nysten,, Per
    Sveriges geologiska undersökning.
    Hellström, Fredrik
    Sveriges geologiska undersökning.
    Age of the rhyolite hosting the Ultevis Mn-Fe-Ba-As mineralisation, northern Sweden2018Report (Other academic)
    Abstract [en]

    A feldspar-porphyric Svecofennian rhyolite associated with Mn-mineralisations at Ultevis, west of Jokkmokk, northern Sweden, has been dated to 1872 ± 9 Ma. This figure also gives a maximum age of deposition of the stratigraphically overlaying sedimentary rock sequence (the Snavva–Sjöfall group). The position of Mn-Fe-Ba-As-F-U-(W-Mo) mineralisations is discussed in relation to the transition from volcanic to sedimentary environments in the Tjåmotis–Ultevis area.

  • 12.
    Nysten, Per
    et al.
    Sveriges geologiska undersökning.
    Persson, Stefan
    Sveriges geologiska undersökning.
    Triumf, Carl-Axel
    Sveriges geologiska undersökning.
    Persson, Per-Olof
    Swedish Museum of Natural History, Department of Geology.
    Hellström, Fredrik
    Sveriges geologiska undersökning.
    Morris, George
    Sveriges geologiska undersökning.
    U-Pb zircon dating of granodiorite from the Muddus structure, northern Sweden.2018Report (Other academic)
    Abstract [en]

    A Svecofennian granodiorite forming the core of the Muddus structure, has been dated to 1889±5 Ma. This is interpreted as the igneous crystallisation age of the rock. The geophysical signature and geological composition of this structure is also discussed.

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