Email this article STABILITY OF CARBONATES DURING SUBDUCTION: INFLUENCE OF THE DEHYDRATION REGIME OF CHLORINE-BEARING METAPELITE
- Authors: Sokol A.G.1, Kruk A.N.1, Koz’menko O.A.1, Palyanov Y.N.1
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Affiliations:
- Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
- Issue: Vol 509, No 1 (2023)
- Pages: 50-55
- Section: МИНЕРАЛОГИЯ
- URL: https://journals.rcsi.science/2686-7397/article/view/135744
- DOI: https://doi.org/10.31857/S2686739722602381
- EDN: https://elibrary.ru/THTDZE
- ID: 135744
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Abstract
It was shown that at a pressure of 3.0–7.8 GPa and a temperature of 750–1030°C, a set of reactions occurred in carbonate-bearing and Cl-enriched pelite that is finally converted into eclogite-like assemblage and formed H2O–CO2 Cl-enriched fluid. The eclogite-like assemblage remains stable when P-T conditions change concordantly with hot subduction geotherms, whereas carbonate is completely dissolved in the fluid already at ≥5.5 GPa. In quenched fluid the content of CO2 reaches 30 wt. %. However, preliminary defluidization of pelite at 3.0 GPa and 750°С leads to chlorine removal and carbonate stabilization at 5.5 GPa and at 7.8 GPa in equilibrium with the next chlorine-free portions of fluid. Thus, the stability of carbonates under P-T conditions typical of subduction zones is dependent on the behavior of chlorine during defluidization of marine sediments.
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About the authors
A. G. Sokol
Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Author for correspondence.
Email: sokola@igm.nsc.ru
Russian Federation, Novosibirsk
A. N. Kruk
Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Email: sokola@igm.nsc.ru
Russian Federation, Novosibirsk
O. A. Koz’menko
Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Email: sokola@igm.nsc.ru
Russian Federation, Novosibirsk
Yu. N. Palyanov
Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Email: sokola@igm.nsc.ru
Russian Federation, Novosibirsk
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