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The Mesozoic–Cenozoic tectonic evolution of the New Siberian Islands, NE Russia

Published online by Cambridge University Press:  25 September 2014

CHRISTIAN BRANDES*
Affiliation:
Institut für Geologie, Leibniz Universität Hannover, Callinstraße, 30167 Hannover, Germany
KARSTEN PIEPJOHN
Affiliation:
Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Stilleweg 2, 30655 Hannover, Germany
DIETER FRANKE
Affiliation:
Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Stilleweg 2, 30655 Hannover, Germany
NIKOLAY SOBOLEV
Affiliation:
A.P. Karpinsky Russian Geological Research Institute (VSEGEI), Sredny av. 74, 199106 Saint-Petersburg, Russia
CHRISTOPH GAEDICKE
Affiliation:
Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Stilleweg 2, 30655 Hannover, Germany
*
Author for correspondence: brandes@geowi.uni-hannover.de

Abstract

On the New Siberian Islands the rocks of the east Russian Arctic shelf are exposed and allow an assessment of the structural evolution of the region. Tectonic fabrics provide evidence of three palaeo-shortening directions (NE–SW, WNW–ESE and NNW–SSE to NNE–SSW) and one set of palaeo-extension directions revealed a NE–SW to NNE–SSW direction. The contractional deformation is most likely the expression of the Cretaceous formation of the South Anyui fold–thrust belt. The NE–SW shortening is the most prominent tectonic phase in the study area. The WNW–ESE and NNW–SSE to NNE–SSW-oriented palaeo-shortening directions are also most likely related to fold belt formation; the latter might also have resulted from a bend in the suture zone. The younger Cenozoic NE–SW to NNE–SSW extensional direction is interpreted as a consequence of rifting in the Laptev Sea.

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Type
Original Articles
Copyright
Copyright © Cambridge University Press 2014 

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