Triassic deposits of Chukotka, Wrangel Island and Mendeleev Rise, Arctic Sea: sedimentology and geodynamic implications

A comparative analysis of Upper Triassic sandstones from Mendeleev Rise, Wrangel Island, and Chukotka reveals distinct geodynamic origins. Sandstones from Mendeleev Rise show evidence of intense weathering and a quartzose sedimentary provenance, unlike those from Wrangel Island (intermediate igneous) and Chukotka (mafic igneous). Facies studies suggest Mendeleev sandstones formed in shallow or coastal-marine settings near a continent, while Wrangel and Chukotka deposits accumulated in deeper marine environments. Detrital zircon populations across all regions are dominated by Paleozoic grains, supporting shared tectonic influences. This study highlights the diverse sedimentary histories of Arctic Triassic deposits, offering insights into paleogeographic reconstructions.

Tuchkova, M. I., Shokalsky, S. P., Petrov, O. V., Sokolov, S. D., Sergeev, S. A., & Moiseev, A. V. (2020). Triassic deposits of Chukotka, Wrangel Island and Mendeleev Rise, Arctic Sea: sedimentology and geodynamic implications. Gff, 142(2), 158–168. https://doi.org/10.1080/11035897.2020.1724668