STABILITY OF CARBONATES DURING SUBDUCTION: INFLUENCE OF THE DEHYDRATION REGIME OF CHLORINE-BEARING METAPELITE

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

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.

Авторлар туралы

A. Sokol

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: sokola@igm.nsc.ru
Russian Federation, Novosibirsk

A. Kruk

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: sokola@igm.nsc.ru
Russian Federation, Novosibirsk

O. Koz’menko

Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: sokola@igm.nsc.ru
Russian Federation, Novosibirsk

Yu. 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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© А.Г. Сокол, А.Н. Крук, О.А. Козьменко, Ю.Н. Пальянов, 2023

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