Phase Stability and Reactions of Subducting CaCO3 under Upper Mantle Conditions

CaCO3 is an important component of marine sediments and one of the major deep‐carbon carriers at subduction zones. Some subducted CaCO3 can be dissolved in subduction fluids and recycled back to the surface via arc volcanoes degassing. At the same time, there still remain large amounts of CaCO3 and...

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Bibliographic Details
Published in:Acta geologica Sinica (Beijing) 2023-02, Vol.97 (1), p.309-315
Main Authors: GUI, Weibin, SHEN, Kewei, LIU, Jin
Format: Article
Language:English
Subjects:
Biosphere
Calcium carbonate
calcium carbonates
Carbon
Chemical properties
Chemicophysical properties
Degassing
Earth mantle
Fluids
High pressure
Hydrosphere
Marine sediments
Phase stability
Reaction products
Sediments
Slabs
subducting carbon
Subduction
Subduction (geology)
subduction zone
Subduction zones
Upper mantle
Volcanoes
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Summary:CaCO3 is an important component of marine sediments and one of the major deep‐carbon carriers at subduction zones. Some subducted CaCO3 can be dissolved in subduction fluids and recycled back to the surface via arc volcanoes degassing. At the same time, there still remain large amounts of CaCO3 and its reaction products, which could be further transported into Earth's deep interior. These internal processes link atmosphere, hydrosphere and biosphere with the deep solid Earth, modifying the environments of our planet. In this review, we summarize current understanding from high pressure‐temperature experiments and field petrological observations on the physical and chemical properties of CaCO3. In particular, the phase stability and reactions of CaCO3 largely control the migration and reservation of oxidized carbon in subducting slabs. Finally, we present several critical but unsolved questions on CaCO3 subducting in the deep mantle.
ISSN:1000-9515
1755-6724
DOI:10.1111/1755-6724.15040