NDLI: Sr–Nd isotope and geochemical characterisation of the Paleoproterozoic Västervik formation (Baltic Shield, SE-Sweden): a southerly exposure of Svecofennian metasiliciclastic sediments

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Sr–Nd isotope and geochemical characterisation of the Paleoproterozoic Västervik formation (Baltic Shield, SE-Sweden): a southerly exposure of Svecofennian metasiliciclastic sediments

Content Provider	Springer Nature Link
Author	Kleinhanns, I. C. Fischer Gödde, M. Hansen, B. T.
Copyright Year	2011
Abstract	The Paleoproterozoic Västervik formation represents the southernmost exposure of Svecofennian metasediments and comprises a large psammitic succession of up to 5,000 m thickness dominated by quartzite with minor pelite and arkose. The Västervik formation was deposited in a time interval of ~30 m.y. from 1.88 until 1.85 Ga. Whole-rock geochemical data and Rb–Sr–Sm–Nd analyses in combination with bulk zircon U–Pb ID–TIMS studies help to gain insight into the depositional and geodynamic history of the metasiliciclastic units of the Västervik formation. Discrimination function diagrams show good agreement of major element composition with petrographic characterisation pointing towards a quartzose sedimentary provenance area with a tendency towards felsic igneous provenance. Trace element characteristics show typical upper crustal composition and remarkably similar patterns despite the respective petrographic differences. Sm–Nd isotope systematics reveal a restricted range of TDM with 2.3 ± 0.1 Ga and initial Nd (1.80 Ga) values from −4 to −2. These values are in agreement with known values from other Svecofennian sedimentary basins and support the interpretation of the Västervik formation as a typical Svecofennian metasedimentary sequence. Three samples were analysed with the zircon U–Pb ID–TIMS technique, and resulting mixing ages of ~2.1 Ga are typical for Svecofennian metasediments. The final stage of the geodynamic history of the Västervik area was a HT/LP overprint that caused intense migmatisation and anatectic production of in situ granite melts. This was accompanied by large-scale metasomatism, which led to a regional disturbance of the Rb–Sr isotope system indicating an age of ~1,750 Ma for this event. This age overlaps with timing of the tectonic activity of the Loftahammar-Linköping deformation zone (LLDZ), a large-scale deformation zone, lying directly to the north of the study area, presumably linking these two events.
Starting Page	39
Ending Page	55
Page Count	17
File Format	PDF
ISSN	14373254
Journal	International Journal of Earth Sciences
Volume Number	101
Issue Number	1
e-ISSN	14373262
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-05-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Västervik basin Svecofennian domain Baltic Shield Rb–Sr Sm–Nd U–Pb Geophysics/Geodesy Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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