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Channelized CO₂-Rich Fluid Activity along a Subduction Interface in the Paleoproterozoic Wutai Complex, North China Craton

Wang, Bin and Tian, Wei and Fu, Bin and Fang, Jia-Qi (2021) Channelized CO₂-Rich Fluid Activity along a Subduction Interface in the Paleoproterozoic Wutai Complex, North China Craton. Minerals, 11 (7). Art. No. 748. ISSN 2075-163X. doi:10.3390/min11070748. https://resolver.caltech.edu/CaltechAUTHORS:20210721-214405010

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Abstract

Greenschist facies metabasite (chlorite schist) and metasediments (banded iron formation (BIF)) in the Wutai Complex, North China Craton recorded extensive fluid activities during subduction-related metamorphism. The pervasive dolomitization in the chlorite schist and significant dolomite enrichment at the BIF–chlorite schist interface support the existence of highly channelized updip transportation of CO₂-rich hydrothermal fluids. Xenotime from the chlorite schist has U concentrations of 39–254 ppm and Th concentrations of 121–2367 ppm, with U/Th ratios of 0.11–0.62, which is typical of xenotime precipitated from circulating hydrothermal fluids. SHRIMP U–Th–Pb dating of xenotime determines a fluid activity age of 1.85 ± 0.07 Ga. The metasomatic dolomite has δ¹³C_(V-PDB) from −4.17‰ to −3.10‰, which is significantly lower than that of carbonates from greenschists, but similar to the fluid originated from Rayleigh fractionating decarbonation at amphibolite facies metamorphism along the regional geotherm (~15 °C/km) of the Wutai Complex. The δ¹⁸O_(V-SMOW) values of the dolomite (12.08–13.85‰) can also correspond to this process, considering the contribution of dehydration. Based on phase equilibrium modelling, we ascertained that the hydrothermal fluid was rich in CO₂, alkalis, and silica, with X(CO₂) in the range of 0.24–0.28. All of these constraints suggest a channelized CO₂-rich fluid activity along the sediment–basite interface in a warm Paleoproterozoic subduction zone, which allowed extensive migration and sequestration of volatiles (especially carbon species) beneath the forearc.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3390/min11070748DOIArticle
ORCID:
AuthorORCID
Wang, Bin0000-0002-7635-6535
Alternate Title:Channelized CO2-Rich Fluid Activity along a Subduction Interface in the Paleoproterozoic Wutai Complex, North China Craton
Additional Information:© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Received: 17 June 2021; Accepted: 7 July 2021; Published: 9 July 2021. Suggestions and comments from Cees-Jan De Hoog and three anonymous reviewers improved the quality of this article. We thank I.H. Campbell, H.W. Li, X.L. Li, and F. Ma for their assistance with experimentations, and Z.P. Wang, M.Y. Gong, and Y.K. Di for their participation in the field work. B. Wang thanks B.F. Han for his course of systematic and frontier lectures about subduction. This research was funded by the National Key Research and Development Program of China, grant number 2019YFA0708503, and the National Natural Science Foundation of China, grant numbers 41973028 and 42030304. Author Contributions: Conceptualization, B.W. and W.T.; methodology, B.W., W.T., B.F., and J.-Q.F.; validation, B.W. and W.T.; formal analysis, B.W., B.F., and J.-Q.F.; investigation, B.W., W.T., B.F., and J.-Q.F.; resources, W.T. and B.F.; data curation, B.W., W.T., B.F., and J.-Q.F.; writing—original draft preparation, B.W.; writing—review and editing, W.T.; visualization, B.W.; supervision, W.T.; project administration, W.T.; funding acquisition, W.T. All authors have read and agreed to the published version of the manuscript. The authors declare no conflict of interest. The funders had no role in the design of the study, in the collection, analyses, or interpretation of data, in the writing of the manuscript, or in the decision to publish the results. Data Availability Statement: Some of the data presented in this study are available in the Supplementary Materials, Tables S1–S3.
Funders:
Funding AgencyGrant Number
National Key Research and Development Program of China2019YFA0708503
National Natural Science Foundation of China41973028
National Natural Science Foundation of China42030304
Subject Keywords:dolomite; C–O isotopes; fluid channelization; carbon cycle; warm subduction
Issue or Number:7
DOI:10.3390/min11070748
Record Number:CaltechAUTHORS:20210721-214405010
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210721-214405010
Official Citation:Wang, B.; Tian, W.; Fu, B.; Fang, J.‐Q. Channelized CO2‐Rich Fluid Activity along a Subduction Interface in the Paleoproterozoic Wutai Complex, North China Craton. Minerals 2021, 11, 748. https://doi.org/10.3390/min11070748
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109961
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Jul 2021 22:53
Last Modified:26 Jul 2021 22:53

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