Hypostratotype of the Bashkirian Stage of the Carboniferous System (Askyn River, Bashkortostan): Lithology, Isotopes (δ13C, δ18O) and Carbonate Depositional Settingsстатья

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[1] Hypostratotype of the bashkirian stage of the carboniferous system (askyn river, bashkortostan): Lithology, isotopes (δ13c, δ18o) and carbonate depositional settings / V. N. Kuleshov, K. M. Sedaeva, V. M. Gorozhanin, E. N. Gorozhanina // Stratigraphy and Geological Correlation. — 2018. — Vol. 26, no. 6. — P. 686–707. The isotopic composition and lithology of in the hypostratotype of the Bashkirian Stage (Pennsylvanian) in the Askyn River section (Bashkortostan, western slope of the South Urals) are studied. The isotopic study (δ13C, δ18O) was conducted taking the carbonate lithology into account. The succession studied is composed of Upper Serpukhovian, Bashkirian and Lower Moscovian carbonates of various lithological types, changeable throughout the section. The Serpukhovian carbonates are characterized by a relatively light carbon isotopic composition (negative values of δ13C), whereas the Bashkirian and Moscovian sediments have a heavy composition (mainly positive values of δ13C). The isotope-carbon anomaly of the first order, fixed at the Mississippian-Pennsylvanian boundary and with a global distribution, is recorded in the studied hypostratotype section slightly higher than the uniformly accepted boundary level. This may indicate that the section contains “transitional beds” at the base of the Bashkirian. In the studied carbonates, a relationship (of the second order) of the isotope composition of carbon and oxygen from the lithological type of rocks is sometimes recorded. The variation in the values of δ13C and δ18O in carbonates reflects changes in the conditions in which they were formed (temporary and local changes in paleotemperature, bioproductivity, desalination) and epigenetic changes. [ DOI ]

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