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Neoproterozoic Orogeny along the margins of Siberia

By
V. A. Vernikovsky
V. A. Vernikovsky
1
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch, Russian Academy of Sciences
Koptyug Prosp., 3, 630090, Novosibirsk, Russia
taimyr@uiggm.nsc.ru
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A. E. Vernikovskaya
A. E. Vernikovskaya
1
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch, Russian Academy of Sciences
Koptyug Prosp., 3, 630090, Novosibirsk, Russia
taimyr@uiggm.nsc.ru
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V. L. Pease
V. L. Pease
2
Department for Geology and Geochemistry, Stockholm University
SE-10691 Stockholm, Sweden
taimyr@uiggm.nsc.ru
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D. G. Gee
D. G. Gee
3
Department of Earth Sciences, Uppsala University
Villavagen 16, SE-75236 Uppsala
taimyr@uiggm.nsc.ru
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Published:
January 01, 2004

Abstract

The Siberian Craton is bounded by fold-and-thrust belts involving Neoproterozoic (locally Mesoproterozoic) complexes on the southern (Baikal-Vitim), western (Yenisey Ridge and Turukhansk-Igarka), northern (Taimyr), and eastern (Verkhoyansk) sides. This paper focuses on the geological structure and evolution of these formations. Previous and new geochronological data show that passive continental margins existed around most of the Siberian Craton during the early Neoproterozoic and possibly the late Mesoproterozoic. Between about 850–760 Ma, the southern, western and northern passive margins of the Siberian Craton were transformed into active margins. Middle-late Neoproterozoic island arcs and ophiolites were formed between c. 750–650 Ma along these margins; they are inferred to have been obducted onto the Siberian continental margin at c. 600 Ma, prior to late Vendian deposition. New ion microprobe U–Pb ages of ophiolitic rocks from Taimyr's Central domain are presented. The Neoproterozoic record in the Cretaceous Verkhoyansk fold-and-thrust belt indicates that the eastern part of the Siberian Craton remained a passive continental margin during the Neoproterozoic and Palaeozoic. Baltica-Siberia relationships are also discussed.

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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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