Cold-seep carbonates of the Laptev Sea continental slope: Constraints from fluid sources and environment of formation; Chemical Geology; Vol. 610

Cold-seep carbonates of the Laptev Sea continental slope: Constraints from fluid sources and environment of formation; Chemical Geology; Vol. 610

Bibliographic Details
Parent link:Chemical Geology
Vol. 610.— 2022.— [121103, 13 p.]
Corporate Author: Национальный исследовательский Томский политехнический университет Инженерная школа природных ресурсов Отделение геологии
Other Authors: Ruban A. S. Aleksey Sergeevich, Rudmin M. A. Maksim Andreevich, Mazurov A. K. Aleksey Karpovich, Chernykh D. V. Denis Vyacheslavovich, Dudarev O. V. Oleg Viktorovich, Semiletov I. P. Igor Petrovich
Summary:Title screen
This study presents results of the petrographic, mineralogical, stable isotopes of oxygen and carbon, and trace element investigation of authigenic carbonates collected at newly discovered active cold seeps on the Laptev Sea continental slope at ∼300 m water depth. These carbonates are mainly represented by Mg-calcite with MgCO3 content from 9.1 mol% to 14.0 mol%. The low δ13C values of carbonates ranging from −50.6 ‰ to −32.4 ‰ (V-PDB) indicate that they were formed from anaerobic oxidation of biogenic methane and minor participation of other carbon sources. The difference between measured (from 4.7 ‰ to 5.5 ‰) and calculated (4.0 ‰) δ18Ocarb values might be inherited from fluids enriched in 18O due to dissociation of gas hydrates, which could be the source of methane. The carbonates exhibit weak enrichment in Co, moderate and strong enrichments in As, Mo, and Sb, and strong enrichment in U. Interestingly, As, Sb, and Co correlate with the pyrite content. This indicates that authigenic iron sulfides promote the immobilization of these redox-sensitive elements in seep sediments. The (Mo/U)EF values and anomalies of concentration of Mo and U probably indicate variations in the redox conditions during carbonate formation due to episodically seepage activity changes. Ascending methane-bearing fluids were the main contributor to the enrichment of cold-seep carbonates in As, Mo, Sb, and U at the Laptev Sea continental slope. However additional input from the particulate shuttle process can not be ruled out.
Режим доступа: по договору с организацией-держателем ресурса
Language:English
Published: 2022
Subjects:
электронный ресурс
труды учёных ТПУ
authigenic carbonates
cold seep
stable oxygen and carbon isotopes
trace element enrichments
redox conditions
Laptev Sea
Online Access:https://doi.org/10.1016/j.chemgeo.2022.121103
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=668683

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