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

被引：0
作者：
Kochnev, B. B. [1 ,2 ,3 ]
Pokrovsky, B. G. [3 ]
Kuznetsov, A. B. [4 ]
机构：
[1] Russian Acad Sci, Trofimuk Inst Petr Geol & Geophys, Siberian Branch, 3 Academician Koptyug Ave, Novosibirsk 630090, Russia
[2] Novosibirsk State Univ, 1 Pirogov St, Novosibirsk 630090, Russia
[3] Russian Acad Sci, Geol Inst, 7-1 Pyzhevsky Ln, Moscow 119017, Russia
[4] Russian Acad Sci, Inst Precambrian Geol & Geochronol, 2 Makarova Emb, St Petersburg 199034, Russia
来源：
GEODYNAMICS & TECTONOPHYSICS | 2023年 / 14卷 / 03期
关键词：
Vendian; Ediacaran; Lower Cambrian; C-and Sr-isotope chemostratigraphy; Siberian Platform; Lena-Anabar trough; OLENEK UPLIFT; WESTERN SLOPE; CARBONATE; STRATIGRAPHY; MAGMATISM; STRATOTYPE; RECORD; MARGIN; CRATON; OXYGEN;
D O I：
10.5800/GT-2023-14-3-0698
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
. 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 & delta;13C values in carbonates of the Turkut and Kessyusa formations in the Khastakhskaya-930 borehole are +7.0...+7.4 & PTSTHOUSND;, 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.
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页数：12
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