MINERALOGY OF CONTINENTAL SEDIMENTS FROM THE ULAN-ZHALGA KEY SECTION (WESTERN TRANSBAIKALIA): RESPONSE TO QUATERNARY CLIMATIC CONDITIONS

E. P. Solotchina; Солотчина Э. П.; M. A. Erbajeva; Ербаева М. А.; A. A. Shchetnikov; Щетников А. А.; M. I. Kuzmin; Кузьмин М. И.; P. A. Solotchin; Солотчин П. А.; A. N. Zhdanova; Жданова А. Н.

doi:10.31857/S2686739723601096

MINERALOGY OF CONTINENTAL SEDIMENTS FROM THE ULAN-ZHALGA KEY SECTION (WESTERN TRANSBAIKALIA): RESPONSE TO QUATERNARY CLIMATIC CONDITIONS

Authors: Solotchina E.P.¹, Erbajeva M.A.², Shchetnikov A.A.³^,4^,5, Kuzmin M.I.⁴, Solotchin P.A.¹, Zhdanova A.N.¹
Affiliations:
1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
2. N.L. Dobretsov Geological Institute of the Siberian Branch of the Russian Academy of Sciences
3. Institute of the Earth`s Crust of the Siberian Branch of the Russian Academy of Sciences
4. A.P. Vinogradov Institute of Geochemistry of the Siberian Branch of the Russian Academy of Sciences
5. Geological Institute of the Russian Academy of Sciences
Issue: Vol 512, No 2 (2023)
Pages: 225-232
Section: MINERALOGY
Submitted: 18.10.2023
Published: 01.10.2023
URL: https://bakhtiniada.ru/2686-7397/article/view/140412
DOI: https://doi.org/10.31857/S2686739723601096
EDN: https://elibrary.ru/FOHYWC
ID: 140412

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Abstract

We present the results of studying the material composition of Quaternary subaerial-slope sediments of the new key section Ulan-Zhalga (Western Transbaikalia) with a thickness of about 30 m. The research methods include X-ray diffractometry (XRD), infrared spectroscopy, laser grain size analysis, elemental analysis. Quartz, feldspar, clay minerals, carbonates, hematite and traces of amphibole were found in the mineral composition of the studied sediments. For the first time the composition and structure of carbonate minerals were shown as a reliable indicator of climatic changes in the Pleistocene and Holocene for the subaerial section. For correct identification and determination of quantitative ratios of carbonates the mathematical modeling of their XRD patterns by the Pearson VII function was used. It has been established that the structure of the section involves two thick sequences differing in lithological and mineralogical features corresponding to two major stages of sedimentation. The lower sequence was formed under conditions of moderate wind activity and relatively high humidity as evidenced by the widespread development of soil horizons and the presence of low-Mg carbonates. The upper sequence, formed under colder and drier conditions with increased dynamics of aeolian processes is characterized by the presence of calcite, high-Mg calcite and excess-Ca dolomite.

Keywords

subaerial sediments, XRD analysis, carbonates, quartz, feldspars, Quaternary period, Western Transbaikalia

References

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