U-Pb age and Sr-chemostratigraphy of limestone from the Sorna Formation,Azyr-Tal Range,Kuznetsk Alatau期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

U-Pb age and Sr-chemostratigraphy of limestone from the Sorna Formation,Azyr-Tal Range,Kuznetsk Alatau

Authors:	G. V. Ovchinnikova A. B. Kuznetsov I. M. Gorokhov E. F. Letnikova O. K. Kaurova B. M. Gorokhovskii

Affiliation:	1.Institute of Precambrian Geology and Geochronology,Russian Academy of Sciences,St. Petersburg,Russia;2.Sobolev Institute of Geology and Mineralogy, Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia

Abstract:	The U-Pb(Pb-Pb) age was determined for limestone from member III of the Sorna Formation out- cropped on the Azyr-Tal Range, Kuznetsk Alatau. The weighted average value from three calculated values is 523 ± 5 Ma (MSWD = 0.02, 2σ). This age coincides with the Early Cambrian age interval determined with Sr isotopic chemostratigraphy (⁸⁷Sr/⁸⁶Sr ratio is 0.70850–0.70852). The low value of μ₂ = ²³⁸U/²⁰⁴Pb for limestone is due to the evolution of diagenetic fluid containing lead from the mantle reservoir into the Sorna sediments.

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