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Book Chapter

Timanide hinterland

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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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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