Sources of paleomagnetic signal in iron-bearing marine sedimentary deposits

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Abstract

This paper presents the results of interpreting the change in the magnetic signal of ferruginous marine sedimentary rocks using the example of the Cretaceous-Paleogene Bakchar deposit (Western Siberia). Anomalous magnetic susceptibility (MS) values are determined by two factors: (a) a diagenetic process accompanied by the formation of pyrrhotite, greigite and siderite in ironstones, (b) an increase detrital input with deposition of magnetite and ilmenite in the siltstones on the background of climate moistening and intense weathering. It is shown that increased MS values in iron-bearing marine sedimentary deposits can be associated with the formation of ferrimagnetic sulfides, which indicates to the methane emission through ancient marine bottom sediments.

About the authors

M. A. Rudmin

National Research Tomsk Polytechnic University

Author for correspondence.
Email: rudminma@tpu.ru
Russian Federation, 30, Lenin Avenue,Tomsk, 634034

A. K. Mazurov

National Research Tomsk Polytechnic University

Email: rudminma@tpu.ru
Russian Federation, 30, Lenin Avenue,Tomsk, 634034

V. I. Sergienko

Pacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences

Email: rudminma@tpu.ru

Academician of the RAS

Russian Federation, 43, Baltiyskaya Street, Vladivostok, 690041

O. G. Savichev

National Research Tomsk Polytechnic University

Email: rudminma@tpu.ru
Russian Federation, 30, Lenin Avenue,Tomsk, 634034

I. P. Semiletov

National Research Tomsk Polytechnic University; Pacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences

Email: rudminma@tpu.ru

Correspondent member of RAS

Russian Federation, 30, Lenin Avenue,Tomsk, 634034; 43, Baltiyskaya Street, Vladivostok, 690041

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