@misc{10481/85025,
year = {2023},
month = {8},
url = {https://hdl.handle.net/10481/85025},
abstract = {Fluids released through the dehydration of serpentinite can be rich in Cl −, which enables the
significant mobility of Cr in subduction zones. However, the Cr isotope behavior accompanying the mobility
of Cr during serpentinite dehydration is still poorly constrained. Here, we report high-precision Cr isotope
data for a unique suite of serpentinites that represent metamorphic products at different depths in oceanic
subduction zones. Low-grade serpentinites affected by significant Cr loss during serpentinization exhibit
remarkably higher δ 53Cr, while samples with Cr contents >∼1,800 ppm typically preserve mantle-like δ 53Cr.
Antigorite serpentinites have an average δ 53Cr value of −0.17‰ ± 0.19‰ (n = 12, 2SD), which is statistically
lower than those of low-grade serpentinite (−0.05‰ ± 0.30‰, n = 80, 2SD) and higher-grade chlorite
harzburgite (−0.10‰ ± 0.27‰, n = 22, 2SD). This suggests that resolvable Cr isotope fractionation occurs
during serpentinite dehydration, which is explained by the variability of Cr isotope behavior in the presence of
Cl-bearing fluids at different dehydration stages. No obvious Cr isotope fractionation was found during chlorite
harzburgite dehydration, probably related to the limited Cr mobility in a Cl-poor fluid. Other processes, such as
melt extraction, external fluid influx and retrograde metamorphism, have negligible effects on the Cr isotope
systematics of meta-serpentinites. Fluids released by serpentinite dehydration may have a great effect on the Cr
isotope heterogeneity of mantle wedge peridotites and arc magmas.},
organization = {National Key Ramp;D Program of China},
organization = {Strategic Priority Research Program (B) of CAS	2018YFA0702600},
organization = {National Natural Science Foundation of China (NSFC)	XDB41000000},
organization = {Fundamental Research Funds for the Central Universities	42073029
41973004},
organization = {CNSA},
organization = {MICIN/AEI	D020204},
organization = {FEDER program "Una manera de hacer Europa"	PID2022-136471N-B-C21 C22
PID2019-111715GB-I00},
organization = {AEI},
organization = {FSE program "FSE invierte en tu futuro"	RYC2018-024363-I},
organization = {Junta de Andalucia},
organization = {European Union (EU)	Postdoc_21_00791},
organization = {European Social Fund (ESF)},
organization = {Junta de Andalucia		
RNM-131
RNM-374},
publisher = {Wiley},
title = {Chromium Isotope Behavior During Serpentinite Dehydration in Oceanic Subduction Zones},
doi = {10.1029/2023JB026601},
author = {Xiong, Jia-Wei and Marchesi, Claudio and Padrón Navarta, José Alberto and Menzel, Manuel D. and Garrido, Carlos J.},
}