Lithochemical features of Vendian clay rocks of the Shkapovo-Shikhan depression: In search of camouflage pyroclastics
https://doi.org/10.24930/1681-9004-2021-21-2-158-171
Abstract
Research subject. Vendian clay rocks of the Shkapovo-Shikhan depression, which is situated in the east of the Volga-Ural region, and volcanic tuffs present among the Vendian deposits (Sylvitsa and Asha groups) on the western slope of the Middle and South Urals.
Material and methods. The research was conducted using data on the content of the main rock-forming oxides in about 70 samples of clay rocks and volcanic tuffs. On this basis, a number of indicator ratios (lithochemical modules) were calculated. These calculated values, as well as the contents of some rock-forming oxides, were compared with both the available data on volcanic tuffs and literature threshold values, which differentiate “ordinary sedimentary rocks” from those presumably comprising camouflage pyroclastics.
Results. It is impossible to draw any definite conclusion regarding the presence of camouflage pyroclastics in the clay rocks of the Staropetrovo, Salikhovo and Karlin formations of the Shkapovo-Shikhan depression based exclusively on lithochemical studies. It seems that the investigated samples either contain no camouflage pyroclastics, or its amount is rather small.
Conclusions. In order to reliably establish the presence of camouflage pyroclastics in the Vendian deposits of the Shkapovo-Shikhan depression, research into the bulk chemical composition of clay rocks should be continued both on a more representative sample collection and using geochemical methods.
Supporting agencies: The research was carried out with the financial support of the Russian Science Foundation (grant No. 19-17-00099)
About the Author
A. V. Maslov
A.N. Zavaritsky Institute of Geology and Geochemistry, Urals Branch of RAS; V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of RAS
Russian Federation
Russian Federation
Andrey V. Maslov
15 Akad. Vonsovsky st., Ekaterinburg 620016; 3 Akad. Koptyug av., Novosibirsk 630090
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Review
For citations:
Maslov A.V. Lithochemical features of Vendian clay rocks of the Shkapovo-Shikhan depression: In search of camouflage pyroclastics. LITHOSPHERE (Russia). 2021;21(2):158-171. (In Russ.) https://doi.org/10.24930/1681-9004-2021-21-2-158-171
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