The Lithological and Geochemical Features and Paleoclimatic Conditions for the Formation of the Verkhnyaya Lena Group (Southeast of the Siberian Platform

Merenkova, S.I.; Korovnikov, I.V.; Gabdullin, R.R.

Авторы: Merenkova S.I., Korovnikov I.V., Gabdullin R.R.
Журнал: Moscow University Geology Bulletin
Том: 78
Номер: 5
Год издания: 2023
Издательство: Allerton Press Inc.
Местоположение издательства: United States
Первая страница: 573
Последняя страница: 585
Оригинальные версии: Литолого-геохимические особен-ности и палеоклиматические условия формирования пород верхоленской серии Вестник Московского университета. Серия 4: Геология
DOI: 10.3103/S0145875223050095
Аннотация: Abstract—The Verkhnyaya Lena Group (Є2–3vl) has been studied in a section on the right bank of the Malaya Chuya River. Concentrations of main oxides and some trace elements (Cr, V, Ni, Cu, Zn, Rb, Sr, Zr, Ba, U, Th, Y, Nb, and Cl) have been determined in samples using an X-ray spectral fluorescence (XRF) analysis. The normative mineral composition has been determined based on the results of the XRF analysis using the MINLITH software. Based on geochemical data, intervals of change in the weathering features (physical/chemical and arid/humid weathering) are clearly differentiated in the denudation area, which are fixed by variations in the values of the Al2O3/K2O and Ln(Al2O3/Na2O) ratios and concentrations of V, Cu, Zn, Rb, and Ni, as well as the normative mineral composition. Apparently, Cr was transported to the basin exclusively by the aeolian process in this case and marks periods of increased wind transport intensity. Under conditions of tectonic activation and progressive isolation of the Upper Lena paleobasin, the described lithological and geochemical features provide some information about the climate changes that accompanied theseevents.Keywords: paleoclimate, Cambrian, geochemical indicators, Siberian Platform
Добавил в систему: Габдуллин Руслан Рустемович

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