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VENDIAN-CAMBRIAN ROCKS OF THE UPPER KALAR GRABEN-SYNCLINE OF THE SOUTHERN PART OF SIBERIAN CRATON: MINERALOGY AND MAJOR ELEMENTS GEOCHEMISTRY Vendian-Cambrian Rocks of the Upper Kalar Graben-Syncline of the Southern Part of Siberian Craton: Mineralogy and Major Elements Geochemistry

Published in Russian Journal of Earth Sciences · Volume 24, Issue 4 · Pages 1–14 · Rubric: ORIGINAL ARTICLES
DOI: https://doi.org/10.2205/2024es000923 · EDN: DNFGSX
Received: 16.02.2024 Accepted: 15.07.2024 Published: 26.12.2024
The features of the mineral and chemical composition (major elements) of the Vendian-Cambrian rocks of the Silimkun Formation (V-Є1sl), exposed on the western side of the Upper Kalar graben syncline in the southwest of the Aldan shield, are considered. The studied rocks – sandstones and siltstones, belong to arkoses and subarkoses. According to their chemotype, they correspond normosilites and myosilites. In terms of the alkaline modulus, the studied silites are hyperpotassium and serve as a fairly striking example of the products of Precambrian arid weathering. The standard mineral composition, its variations, the validity of calculations based on petrographic research data, the problems of using climate indices and lithochemical diagrams aimed at reconstructing climatic changes in the geological past are discussed. Chemical Index of Alteration (CIA) index values range from 49, which corresponds to a virtually unchanged rock, to 67. The average is about 58. Minor changes in the index value for this sample are associated primarily with variations in the content of illite cement and muscovite. Robust Weathering index (RW) values range from 37 to 68 (with an average of about 57).
Ediacaran, Cambrian, Udokan region, climate, chemical weathering proxies
Funding
The authors express their deep gratitude to the anonymous reviewers for valuable comments and constructive suggestions on the article revision, which allowed to significantly improve the manuscript. The study was carried out within the framework of the state assignment of the Institute of Oceanology of the Russian Academy of Sciences FMWE-2024-0020. Analytical work was carried out with the support of the state assignment of the Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences. Partial funding from subsidies for the implementation of state assignments of the Geological Institute of the Russian Academy of Sciences FMMG-2023-0007 and Moscow State University AAAA-A16-116033010119-4 and AAAA-A16-116033010120-0.
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