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Effects of decarbonation on elemental behaviors during subduction-zone metamorphism: Evidence from a titanite-rich contact between eclogitefacies marble and omphacitite
Xiao, Yuanyuan1,2,3; Niu, Yaoling1,2,4; Zhang, Hong-Fu5,6; Wang, Kuo-Lung3; Iizuka, Yoshiyuki3; Lin, Jinyan5; Tan, Yulong5; Xu, Yongjiang5
2017-03-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
Volume135Pages:338-346
SubtypeArticle
AbstractIn this paper, we show the effects of subducted carbonates on geochemical processes during subduction-zone metamorphism (SZM) through the study of an eclogite-facies marble coexisting with metabasite from the ultrahigh pressure metamorphic belt of the Chinese Western Tianshan orogen. Between the marble and metabasite is a titanite-rich contact resulting from fluid-facilitated metamorphic reactions between the two lithologies, and recording elemental changes of geodynamic significance. Because this titanite-rich contact is dominated by titanite (an important host for high field strength elements, HFSEs) without white micas (an important host for large ion lithophile elements, LILEs), HFSEs are largely conserved in titanite whereas LILEs are moved away. This observation emphasizes the potential signifitance of subducting carbonate in retaining HFSEs in the slab through the formation and stabilization of titanite, contributing to the characteristic "arc signature" unique to subduction-zone magmatism (i.e., high LILEs, low HFSEs). The implicit assumption in this interpretation is that the observed lithological assemblage represents residues of subducting oceanic crust that has undergone major episodes of dehydration. Subducted carbonates also have significant implications for the origin of mantle isotopic heterogeneity as revealed from oceanic basalts. (C) 2017 Elsevier Ltd. All rights reserved.
KeywordMarine Carbonate Subduction Behaviors Of Chemical Elements Subduction-zone Metamorphism Subduction-zone Magmatism Mantle Isotopic Heterogeneity
DOI10.1016/j.jseaes.2017.01.006
Indexed BySCI
Language英语
WOS IDWOS:000394484600026
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/136768
Collection海洋地质与环境重点实验室
Affiliation1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
3.Acad Sinica, Inst Earth Sci, Taipei 11529, Taiwan
4.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
5.Northwest Univ Xian, Dept Geol, Xian 710069, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Xiao, Yuanyuan,Niu, Yaoling,Zhang, Hong-Fu,et al. Effects of decarbonation on elemental behaviors during subduction-zone metamorphism: Evidence from a titanite-rich contact between eclogitefacies marble and omphacitite[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,135:338-346.
APA Xiao, Yuanyuan.,Niu, Yaoling.,Zhang, Hong-Fu.,Wang, Kuo-Lung.,Iizuka, Yoshiyuki.,...&Xu, Yongjiang.(2017).Effects of decarbonation on elemental behaviors during subduction-zone metamorphism: Evidence from a titanite-rich contact between eclogitefacies marble and omphacitite.JOURNAL OF ASIAN EARTH SCIENCES,135,338-346.
MLA Xiao, Yuanyuan,et al."Effects of decarbonation on elemental behaviors during subduction-zone metamorphism: Evidence from a titanite-rich contact between eclogitefacies marble and omphacitite".JOURNAL OF ASIAN EARTH SCIENCES 135(2017):338-346.
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