2023
DOI: 10.3390/geosciences13050130
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Fluid Redox Fingerprint of the CaCO3+Antigorite Dehydration Reaction in Subducted Metacarbonate Sediments

Abstract: Antigorite dehydration is a process able to release, in comparison with other minerals, the highest amount of H2O from a subducting slab. The released fluid delivers critical elements (e.g., S, Cu, and REE) to the overlying subarc mantle, modifying the mantle source of arc magmas and related ore deposits. Whether antigorite breakdown produces oxidising or reducing fluids is debated. Whereas previous studies have investigated antigorite dehydration in serpentinites (i.e., in a (C)AMFS-H2O system), this contribu… Show more

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Cited by 2 publications
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“…S2 and tables S1 and S2; and see Supplementary Text). The rock consists of calcite (ex-aragonite), dolomite, forsterite, and diopside and has experienced multiple syn-subduction carbonate dissolution-precipitation events ( 38 40 ).…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…S2 and tables S1 and S2; and see Supplementary Text). The rock consists of calcite (ex-aragonite), dolomite, forsterite, and diopside and has experienced multiple syn-subduction carbonate dissolution-precipitation events ( 38 40 ).…”
Section: Resultsmentioning
confidence: 99%
“…The equation of state of ( 63 ) was used to compute the properties of pure H 2 O and CO 2 , and the modified Redlich-Kwong equation of state of ( 64 ) was used to compute the properties of all other solvent species and the activities of all solvent species. For the carbonate sediment composition [Ca-Mg-Fe-Si-C-O 2 -H 2 -S 2 , CMFS-COHS system; DM675; for details on the composition, see ( 39 , 40 )], the closed system phase equilibria were calculated with the “Lagged Speciation” algorithm (an iterative version of the back-calculation algorithm) ( 60 , 65 ). The solid solution models used for the chemical phase diagram calculations for DM675 are reported in table S6.…”
Section: Methodsmentioning
confidence: 99%