Isotopic signatures of deposition and transformation of Lower Cambrian saliferous rocks in the Irkutsk amphitheater: Communication 1. Sulfur isotopic composition |
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| Authors: | V I Vinogradov G A Belenitskaya M I Bujakaite V N Kuleshov M A Minaeva B G Pokrovskii |
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| Institution: | (1) Geological Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017, Russia;(2) Karpinskii All-Russia Research Institute of Geology, Srednii pr. 74, St. Petersburg, 199106, Russia |
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| Abstract: | New isotope data on Lower Cambrian rocks of the Irkutsk amphitheater are reported in three communications. The first communication
is devoted to the sulfur isotopic composition, which is most sensitive to ostsedimentary geochemical transformations of sulfate
rocks in saliferous formations. It is shown that δ34S values in Bel’sk and Zhigalovo boreholes are within 22–35‰ The lowest values are close to the sulfur isotopic composition
of a halogenic basin, while the highest values are related to epigenetic sulfate reduction. This process was responsible for
the elimination of 100 m of anhydrites from the Lower Cambrian section. |
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