SMSPS Stephan Mueller Special Publication Series SMSPS Stephan Mueller Spec. Publ. Ser. 1868-4564 Copernicus Publications Göttingen, Germany 10.5194/smsps-4-177-2009 Provenance analysis and tectonic setting of the Triassic clastic deposits in Western Chukotka, Northeast Russia Tuchkova M. I. 1 Sokolov S. 1 Kravchenko-Berezhnoy I. R. 1 Geological Institute, Russian Academy of Sciences, Moscow, Russia 17 09 2009 4 177 200 Copyright: © 2009 M. I. Tuchkova et al. 2009 © European Geosciences Union 2009 This article is available from https://smsps.copernicus.org/articles/4/177/2009/smsps-4-177-2009.html The full text article is available as a PDF file from https://smsps.copernicus.org/articles/4/177/2009/smsps-4-177-2009.pdf

The study area is part of the Anyui subterrane of the Chukotka microplate, a key element in the evolution of the Amerasia Basin, located in Western Chukotka, Northeast Russia. The subterrane contains variably deformed, folded and cleaved rhythmic Triassic terrigenous deposits which represent the youngest stage of widespread marine deposition which form three different complexes: Lower-Middle Triassic, Upper Triassic (Carnian) and Upper Triassic (Norian). All of the complexes are represented by rhythmic interbeds of sandstone, siltstone and mudstone. Macrofaunas are not numerous, and in some cases deposits are dated by analogy to, or by their relationship with, other units dated with macrofaunas. The deposits are composed of pelagic sediments, low-density flows, high-density flows, and shelf facies associations suggesting that sedimentation was controlled by deltaic progradation on a continental shelf and subsequent submarine fan sedimentation at the base of the continental slope. Petrographic study of the mineral composition indicates that the sandstones are lithic arenites. Although the Triassic sandstones appear similar in outcrop and by classification, the constituent rock fragments are of diverse lithologies, and change in composition from lower grade metamorphic rocks in the Lower-Middle Triassic to higher grade metamorphic rocks in the Upper Triassic. This change suggests that the Triassic deposits represent an unroofing sequence as the source of the clastic material came from more deeply buried rocks with time.

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