FIRST DISCOVERY OF AUTHIGENIC CARBONATES ON THE LAPTEV SEA FLANK OF THE GAKKEL RIDGE (ARCTIC OCEAN)

D. V. Kaminsky; Каминский Д. В.; B. G. Pokrovsky; Покровский Б. Г.; O. V. Petrov; Петров О. В.; A. O. Kiel; Киль А. О.; P. B. Semenov; Семенов П. Б.; O. I. Okina; Окина О. И.; E. A. Logvina; Логвина Е. А.; V. D. Kaminsky; Каминский В. Д.; A. S. Dubensky; Дубенский А. С.; K. E. Degtyarev; Дегтярев К. Е.; M. I. Bujakaite; Буякайте М. И.; I. A. Neevin; Неевин И. А.; A. A. Krylov; Крылов А. А.; N. P. Chamov; Чамов Н. П.; T. Yu. Tolmacheva; Толмачева Т. Ю.

doi:10.31857/S2686739723601102

FIRST DISCOVERY OF AUTHIGENIC CARBONATES ON THE LAPTEV SEA FLANK OF THE GAKKEL RIDGE (ARCTIC OCEAN)

Authors: Kaminsky D.V.¹, Pokrovsky B.G.², Petrov O.V.³, Kiel A.O.¹, Semenov P.B.¹, Okina O.I.², Logvina E.A.¹, Kaminsky V.D.¹, Dubensky A.S.², Degtyarev K.E.², Bujakaite M.I.², Neevin I.A.³, Krylov A.A.¹, Chamov N.P.², Tolmacheva T.Y.³
Affiliations:
1. All-Russian Science Research Institution Okeangeologiya
2. Geological Institute of the Russian Academy of Sciences
3. All-Russian Geological Institution
Issue: Vol 512, No 2 (2023)
Pages: 219-224
Section: MINERALOGY
Submitted: 18.10.2023
Published: 01.10.2023
URL: https://journals.rcsi.science/2686-7397/article/view/140411
DOI: https://doi.org/10.31857/S2686739723601102
EDN: https://elibrary.ru/DXEQIA
ID: 140411

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Abstract

The article describes the first find of authigenic carbonates on the southern flank of the Gakkel Ridge in the zone of its junction with the Laptev Sea continental margin of the Russian Federation. The samples are represented by dense magnesian calcites and aragonites, including rounded and angular fragments of terrigenous material, as well as microphytoplankton of different ages, spores and pollen of terrestrial and aquatic plants. Elemental and organochemical characteristics indicate the predominance of oxidizing or intermediate between oxidizing and reducing conditions of carbonate crystallization, which may be a consequence of their formation near the bottom surface. The isotopic composition of O, C, and Sr allows us to conclude that the diagenetic carbonates of the Gakkel Ridge were deposited mainly in isotopic equilibrium with bottom water at a temperature of about 0°C, which corresponds to measurements from the ship. A wide range of δ¹³С (–23.5 до –37.3) indicates that methane was an important, but not the only source of carbon in carbonates. The wide variations in the ⁸⁷Sr/⁸⁶Sr (0.70906–0.70933), which correlate with the δ¹³С values, show that the carbonate-forming fluid was not only modern sea water, but also diagenetic solutions coming from the sedimentary cover together with methane and the products of methane and organic matter oxidation. Intense discharge of heterogeneous methane-bearing fluids may be related to the high modern tectonic activity of the studied region.

Keywords

Gakkel Ridge, authigenic carbonates, Arctic Ocean, aragonite, magnesian calcite, methane, isotope geochemistry

References

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