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Title: | The Formation of Authigenic Carbonates at a Methane Seep Site in the Northern Part of the Laptev Sea |
Authors: | Ruban, Aleksey Sergeevich Rudmin, Maksim Andreevich Dudarev, Oleg Viktorovich Mazurov, Aleksey Karpovich |
Keywords: | окисление; изотопы кислорода; море Лаптевых; authigenic carbonate; cold seep; anaerobic methane oxidation; oxygen and carbon isotopes; fluid source; Laptev Sea |
Issue Date: | 2020 |
Publisher: | MDPI AG |
Citation: | The Formation of Authigenic Carbonates at a Methane Seep Site in the Northern Part of the Laptev Sea / A. S. Ruban, M. A. Rudmin, O. V. Dudarev, A. K. Mazurov // Minerals. — 2020. — Vol. 10, iss. 11. — [948, 14 p.]. |
Abstract: | Authigenic carbonates from cold seeps are unique archives for studying environmental conditions, including biogeochemical processes associated with methane-rich fluid migration through the sediment column. The aim of this research was to study major oxide, mineralogical, and stable isotopic compositions of cold-seep authigenic carbonates collected in the northern part of the Laptev Sea. These carbonates are represented by Mg-calcite with an Mg content of 2% to 8%. The ?13C values range from ?27.5‰ to ?28.2‰ Vienna Peedee belemnite (VPDB) and indicate that carbonates formed due to anaerobic oxidation of methane, most likely thermogenic in origin. The authigenic pyrite in Mg-calcite is evidence of sulfate reduction during carbonate precipitation. The ?18O values of carbonates vary from 3.5‰ to 3.8‰ VPDB. The calculated ?18Ofluid values show that pore water temperature for precipitated Mg-calcite was comparable to bottom seawater temperature. The presence of authigenic carbonate in the upper horizons of sediments suggests that the sulfate–methane transition zone is shallowly below the sediment–water interface. |
URI: | http://earchive.tpu.ru/handle/11683/64781 |
Appears in Collections: | Репринты научных публикаций |
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reprint-nw-34102.pdf | 3,27 MB | Adobe PDF | View/Open |
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