Sources of the Paleomagnetic Signal in Iron-Rich Marine Sedimentary Rocks

In this work, the results of interpreting the variation of the magnetic signal of iron-rich marine sedimentary rocks were presented by the example of the Cretaceous–Paleogene section of the Bakchar iron ore deposit (Western Siberia). The anomalous values of the magnetic susceptibility are determined...

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Bibliographic Details
Published in:Doklady. Chemistry 2019-05, Vol.486 (1), p.122-125
Main Authors: Rudmin, M. A., Mazurov, A. K., Sergienko, V. I., Savichev, O. G., Semiletov, I. P.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Ferrimagnetism
Historical metallurgy
Ilmenite
Industrial Chemistry/Chemical Engineering
Iron
Iron ores
Iron sulfides
Magnetic permeability
Magnetic signals
Magnetism
Mineral deposits
Paleomagnetism
Pyrrhotite
Sedimentary rocks
Sediments
Siderite
Siltstone
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Summary:In this work, the results of interpreting the variation of the magnetic signal of iron-rich marine sedimentary rocks were presented by the example of the Cretaceous–Paleogene section of the Bakchar iron ore deposit (Western Siberia). The anomalous values of the magnetic susceptibility are determined by two factors: first, a superimposed diagenetic process accompanied by the formation of pyrrhotite, greigite, and siderite among ooidal ironstones; and second, an increase in the continental runoff, causing the accumulation of terrigenous magnetite and ilmenite in the siltstone as the climate becomes increasingly humid and the weathering intensifies. It was shown that the elevated values of the magnetic susceptibility in iron-rich deposits can be due to the formation of ferrimagnetic iron sulfides, which is indicative of methane mobilization through ancient bottom sediments.
ISSN:0012-5008
1608-3113
DOI:10.1134/S0012500819050021