The Strontium Isotopic Composition in Glendonites of the Middle Jurassic in Northern Siberia


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Abstract

The Sr isotope composition in glendonites from two sections of the Middle Jurassic of Northern Siberia has been determined for the first time. Glendonite was formed by the replacement of icite by calcite during diagenesis. The 87Sr/86Sr in most of the samples of glendonites (0.70687–0.70715) is insignificantly lower than this ratio in the Late Bathonian–Early Bajocian ocean. This may indicate a contribution from the Callovian seawater in the formation of individual calcite generations or the influence of methanogenic fluid of deep origin.

About the authors

M. A. Rogov

Geological Institute; St. Petersburg State University

Author for correspondence.
Email: russianjurassic@gmail.com
Russian Federation, Moscow; St. Petersburg

A. B. Kuznetsov

St. Petersburg State University; Institute of Precambrian Geology and Geochronology

Email: russianjurassic@gmail.com
Russian Federation, St. Petersburg; St. Petersburg

G. V. Konstantinova

Institute of Precambrian Geology and Geochronology

Email: russianjurassic@gmail.com
Russian Federation, St. Petersburg

T. L. Turchenko

Institute of Precambrian Geology and Geochronology

Email: russianjurassic@gmail.com
Russian Federation, St. Petersburg

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