Raman Study of Decomposition of Na-Bearing Carbonates in Water Fluid at High P–T Parameters | Sciact - CRIS-system of Boreskov Institute of Catalysis

Raman Study of Decomposition of Na-Bearing Carbonates in Water Fluid at High P–T Parameters Full article

Journal

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
ISSN: 1386-1425 , E-ISSN: 1873-3557

Output data

Year: 2024, Volume: 322, Article number : 124801, Pages count : 12 DOI: 10.1016/j.saa.2024.124801

Tags

Raman spectroscopy; Carbonates; High pressure; High temperature; Abiogenic formation of organics; Organic formates; Organic molecular crystals

Authors

Goryainov Sergey ¹ , Krylov Alexander ² , Borodina Ulyana ¹ , Likhacheva Anna ¹ , Krylova Svetlana ² , Seryotkin Yurii ¹ , Bogdanov Nikita ¹ , Vtyurin Alexander ² , Grishina Svetlana ¹

Affiliations

1	Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, prospect Acad. Koptyug 3, Novosibirsk, 630090, Russia
2	Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, 50, bld. 38, Krasnoyarsk, 660036, Russia

The study of Na-carbonates stability and their transformations in aqueous carbonate fluid under high P–T conditions is relevant from the point of view of the understanding geochemical processes of the Na-assisted carbon circulation in the Earth’s crust and subduction zones. In situ Raman study of Na-bearing carbonate-water-Femetal system in diamond anvil cell (DAC) at high P–T conditions revealed that carbonates decompose witha biogenic formation of formates and other organic compounds that differs from behavior of carbonates in dry system. XRD and FTIR methods have been used additionally to determine the phase composition. Na-bearing carbonates (nahcolite NaHCO3, shortite Na2Ca2(CO3)3 and cancrinite Na7Ca[(CO3)1.5Al6Si6O24]⋅2H2O) in aqueous fluid decompose to form simple carbonates and formates (as dominant organic molecules) at moderate P–T parameters (above ∼0.2 GPa, 200 ◦C). Our experimental results directly confirm the hypothesis of Horita and Berndt (Science, 1999) about possible yield of organic formates in the carbonate-water-metal system. Nahcolite NaHCO3 in aqueous fluid in the presence of Fe metal decomposes into anhydrous phases: natrite -Na2CO3, siderite, magnetite (due to dissolution of Fe steel gasket), Na-formate and likely organic molecular crystalline solvate of Na-formate and methyl formate. Shortite decays into anhydrous phases: aragonite CaCO3, Na-Ca-formates and an amorphous phase. Cancrinite decomposes to unidentified carbonate-alumonosilicate phases, Na-Ca-formates and unknown organic molecular crystal. Magnetite is also formed in this system due to dissolution of Fe steel gasket used in DAC. The present study provides a new insight in processes of abiogenic formation of organic matter from carbonates in the crust and upper mantle

Goryainov S. , Krylov A. , Borodina U. , Likhacheva A. , Krylova S. , Seryotkin Y. , Bogdanov N. , Vtyurin A. , Grishina S.
Raman Study of Decomposition of Na-Bearing Carbonates in Water Fluid at High P–T Parameters
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 2024. V.322. 124801 :1-12. DOI: 10.1016/j.saa.2024.124801 WOS Scopus OpenAlex

Submitted:	Dec 15, 2023
Accepted:	Jul 8, 2024
Published online:	Jul 14, 2024
Published print:	Dec 5, 2024

Web of science:	WOS:001280767400001
Scopus:	2-s2.0-85199292992
OpenAlex:	W4400618267

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