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Zircon U-Pb-Hf isotope data in eclogite and metagabbro from southern Sweden reveal a common long-lived evolution and enriched source
Swedish Museum of Natural History, Department of Geology.
Swedish Museum of Natural History, Department of Geology.
2020 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 142, no 4, p. 253-266Article in journal (Refereed) Published
Abstract [en]

Several orogenies have shaped the bedrock of southern Sweden. While mafic intrusions represent significant sources of information for reconstructing geodynamics and crustal evolution, the characterization of the various generations of such intrusions in Sweden remains limited. We reportin situzircon U-Pb ages and Hf isotope data from a Fe-Ti eclogite and a coronitic metagabbro from the Eastern Segment in southern Sweden. Crystallisation ages at 1683 +/- 17 Ma of the eclogite suggest affiliation with the surrounding 1730-1660 Ma Transscandinavian Igneous Belt intrusions that dominate the Eastern Segment. Secondary zircon growth and Pb-loss in the eclogite sample at 1459 +/- 44 Ma and the crystallisation of the metagabbro at 1431 +/- 26 Ma overlap and are related to magmatic activity during the Hallandian orogeny. Zircon Hf isotope signatures with chondritic and sub-chondritic values at similar to 1683 Ma and similar to 1431 Ma, respectively, correspond to an enriched (or mildly depleted) source in line with a "Mixed Svecofennian Crustal Reservoir". These isotope signatures are more enriched than those in the surrounding gneisses. Zircon isotope data from the herein analysed zircon grains indicate that the eclogite and metagabbro had an enriched mafic source in the mid to lower crust, or within the subcontinental lithospheric mantle below Fennoscandia.

Place, publisher, year, edition, pages
Taylor & Francis, 2020. Vol. 142, no 4, p. 253-266
Keywords [en]
Eclogite; zircon; lu-Hf; u-Pb; eastern Segment; hallandian; sveconorwegian KeyWords Plus:SVECONORWEGIAN OROGEN; BALTIC SHIELD; SW SWEDEN; FENNOSCANDIAN SHIELD; LU-HF; SVECOFENNIAN OROGEN; IDEFJORDEN TERRANE; CONTINENTAL-CRUST; EASTERN SEGMENT; ION-MICROPROBE
National Category
Geology
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-4056OAI: oai:DiVA.org:nrm-4056DiVA, id: diva2:1510963
Available from: 2020-12-17 Created: 2020-12-17 Last updated: 2020-12-17Bibliographically approved

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CiteExportLink to record
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