Indicator Isotope–Geochemical Characteristics of Sulfides from the Satka Magnesite Ore Field (South Urals Province)
- Authors: Krupenin M.T.1, Michurin S.V.2
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Affiliations:
- Institute of Geology and Geochemistry, Ural Branch
- Institute of Geology, Ufa Science Center
- Issue: Vol 478, No 1 (2018)
- Pages: 108-111
- Section: Geochemistry
- URL: https://journals.rcsi.science/1028-334X/article/view/192031
- DOI: https://doi.org/10.1134/S1028334X18010233
- ID: 192031
Cite item
Abstract
The stable enrichment of pyrite from magnesite ores in δ34S isotope (from 5.4 to 6.9‰) compared with pyrite from the host (sedimentary and igneous) rocks was established in the classical Satka sparry magnesite ore field. Concretionary segregations of fine-grained pyrite in dolomite are depleted in the heavy sulfur isotope (δ34S, from–9.1 to–5.8‰). Pyrite from dolerite is characterized by δ34S values (–1.1 and 1.7‰) close to the meteorite sulfur. The δ34S values in barite from the underlying dolomite horizon vary in the range of 32.3–41.4‰. The high degree of homogeneity of the sulfur isotope composition in pyrite from magnesite is a result of thermochemical sulfate reduction during the syngenetic crystallization of pyrite and magnesite from epigenetic brines, formed during dissolution of evaporite sulfate minerals at the stage of early catagenesis of the Riphean deposits.
About the authors
M. T. Krupenin
Institute of Geology and Geochemistry, Ural Branch
Author for correspondence.
Email: krupenin@igg.uran.ru
Russian Federation, Yekaterinburg, 620016
S. V. Michurin
Institute of Geology, Ufa Science Center
Email: krupenin@igg.uran.ru
Russian Federation, Ufa, 450077