C- AND Sr-ISOTOPE CHEMOSTRATIGRAPHY OF THE UPPER PROTEROZOIC – LOWER CAMBRIAN TRANSITIONAL DEPOSITS IN THE LENA-ANABAR TROUGH (NORTHEASTERN SIBERIAN PLATFORM)-Reference-Cited by-同舟云学术

C- AND Sr-ISOTOPE CHEMOSTRATIGRAPHY OF THE UPPER PROTEROZOIC – LOWER CAMBRIAN TRANSITIONAL DEPOSITS IN THE LENA-ANABAR TROUGH (NORTHEASTERN SIBERIAN PLATFORM)

Published:2023-06-18 Issue:3 Volume:14 Page:
ISSN:2078-502X
Container-title:Geodynamics & Tectonophysics
language:
Short-container-title:Geodin. tektonofiz.

Author:

Kochnev B. B.¹,Pokrovsky B. G.²,Kuznetsov A. B.³

Affiliation:

1. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University; Geological Institute, Russian Academy of Sciences

2. Geological Institute, Russian Academy of Sciences

3. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Abstract

Studies have been made of the carbon and strontium isotope composition in carbonate sediments of the Khorbusuonka group and Kessyusa formation corresponding to the Upper Vendian in deep Khastakhskaya-930 and Burskaya-341-0 boreholes at the northeastern margin of the Siberian Platform. The maximum δ13С values in carbonates of the Turkut and Kessyusa formations in the Khastakhskaya-930 borehole are +7.0...+7.4 %, while the minimum 87Sr/86Sr ratios are as low as 0.7079. Such isotope-geochemical characteristics suggest that these formations are younger (Tommotian) or older (early Vendian) than it was supposed and allow for the possibility of alternatives to their regional correlation with the Burskaya-341-0 borehole and Olenek uplift sections. The deposition of sediments of the age considered, more intensive than in the adjacent regions, may be indicative of rift-related extension settings.

Publisher

Institute of Earth's Crust, Siberian Branch of the Russian Academy of Sciences

Subject

Earth-Surface Processes,Geophysics,Geology,Economic Geology

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