Open AccessSources of paleomagnetic signal in iron-bearing marine sedimentary deposits
Author(s) -
Maxim Rudmin,
Maxim Rudmin,
Aleksey Mazurov,
Aleksey Mazurov,
В. И. Сергиенко,
В. И. Сергиенко,
Олег Геннадьевич Савичев,
Олег Геннадьевич Савичев,
I. P. Semiletov,
I. P. Semiletov
Publication year - 2019
Publication title -
doklady akademii nauk. rossijskaâ akademiâ nauk
Language(s) - English
Resource type - Journals
ISSN - 0869-5652
DOI - 10.31857/s0869-5652486153-56
Subject(s) - diagenesis , geology , sedimentary rock , siderite , greigite , magnetite , pyrrhotite , geochemistry , paleogene , paleomagnetism , cretaceous , pyrite , weathering , paleontology
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.