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Late Neoproterozoic granitoid magmatism in the basement to the Pechora Basin, NW Russia: geochemical constraints indicate westward subduction beneath NE Baltica

By
V. Pease
V. Pease
1
Department of Geology and Geochemistry, Stockholm University, SE-106 91 Sweden, and Laboratory for Isotope Geology, Swedish Natural History Museum
Stockholm, Sweden
vicky.pease@geo.su.se
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E. Dovzhikova
E. Dovzhikova
2
Timan-Pechora Scientific Research Centre
Pushkina 2, 169400 Ukhta, Russia
vicky.pease@geo.su.se
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L. Beliakova
L. Beliakova
2
Timan-Pechora Scientific Research Centre
Pushkina 2, 169400 Ukhta, Russia
vicky.pease@geo.su.se
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D. G. Gee
D. G. Gee
3
Uppsala University
Villavägen 16, SE-752 36 Uppsala, Sweden
vicky.pease@geo.su.se
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Published:
January 01, 2004

Abstract

A unique collection of deep (up to 4.5 km) drillcores from across the Pechora Basin of NW Russia indicate that the Precambrian basement beneath Palaeozoic sediments mainly comprise Neoproterozoic metasedimentary and magmatic complexes. These Neoproterozoic rocks are variously deformed and metamorphosed. They are intruded by granitoids of latest Neoproterozoic age (557 ± 6 Ma, 95% confidence). The granitoids are variably deformed, metamorphose their country rock, and represent syn- to post-tectonic magmatism. Major element, trace element, and Sm-Nd and Rb-Sr isotopic data indicate that these intrusions represent continental arc magmatism. Their geochemistry indicates assimilation of older crust by a magma derived from a depleted mantle source. We infer that the granitoids were generated by westward subduction of oceanic crust beneath Baltica (present day coordinates) at c. 560 Ma.

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Contents

Geological Society, London, Memoirs

The Neoproterozoic Timanide Orogen of Eastern Baltica

David G. Gee
David G. Gee
Uppsala University, Sweden
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Victoria Pease
Victoria Pease
Stockholm University, Sweden
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Geological Society of London
Volume
30
ISBN electronic:
9781862394056
Publication date:
January 01, 2004

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