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The behavior of fluid mobile elements during serpentinization and dehydration of serpentinites in subduction zones
Wu Kai1; Yuan HongLin1; Lyu Nan1; Zhang LiPeng2,3
2020
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume36Issue:1Pages:141-153
Corresponding AuthorWu Kai(wukai0302@gmail.com)
AbstractSerpentine is one of the most important carriers of water and fluid mobile elements in the oceanic lithosphere and subduction zones. The behavior of fluid mobile elements during serpentinization and dehydration of serpentinites is crucial for understanding the geochemical cycle in subduction zones. Serpentinite consists mostly of the serpentine-group minerals including lizardite, chrysotile and antigorite. Fluid mobile elements (B, Li, As, Sb, Pb, Cs, U, Sr, Ba, etc.) are remarkably enriched during serpentinization, and there exist some geochemical differences between abyssal serpentinites and forearc serpentinites due to different protoliths, fluid compositions and oxygen fugacity. For example, forearc serpentinites are relatively more enriched in As, Sb and B, but less enriched in U, indicating of the contributions from subducting sediments. The transition from lizardite to antigorite during dehydration of serpentinite in subduction zones will release more than 50% F and Cl, as well as some fluid mobile elements (e. g. B and Li); formation of metamorphic olivine at the expense of antigorite will release fluids with high fluid mobile element concentrations with Cl, Cs, Pb, As, Sb, Ba, Rb, B, Sr, Li and U up to several orders of magnitude higher than that of primitive mantle. Due to the higher Fe3+ proportions in lizardite compared to antigorite, the transition from lizardite to antigorite will be accompanied by a series of redox reactions in subduction channels, which may affect the nature of the dehydrated fluids and the composition of antigorite formed during this stage. The similarity in enrichments of fluid mobile elements between serpentinites and arc magmas indicates that serpentine minerals play a critical role in element cycling in subduction zones. In addition, the release of F, Cl and B during the phase transition from lizardite to antigorite may play a vital role in formation of porphyry gold deposits, gold deposits in ophiolite and boron deposits reserved in serpentinites.
KeywordSubduction zones Fluid mobile elements Element fractionation Serpentinite Serpentinization
DOI10.18654/1000-0569/2020.01.14
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000533247400014
PublisherSCIENCE PRESS
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/167464
Collection深海极端环境与生命过程研究中心
Corresponding AuthorWu Kai
Affiliation1.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
2.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Marine Geol, Qingdao 266061, Peoples R China
3.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanog, Qingdao 266071, Peoples R China
Recommended Citation
GB/T 7714
Wu Kai,Yuan HongLin,Lyu Nan,et al. The behavior of fluid mobile elements during serpentinization and dehydration of serpentinites in subduction zones[J]. ACTA PETROLOGICA SINICA,2020,36(1):141-153.
APA Wu Kai,Yuan HongLin,Lyu Nan,&Zhang LiPeng.(2020).The behavior of fluid mobile elements during serpentinization and dehydration of serpentinites in subduction zones.ACTA PETROLOGICA SINICA,36(1),141-153.
MLA Wu Kai,et al."The behavior of fluid mobile elements during serpentinization and dehydration of serpentinites in subduction zones".ACTA PETROLOGICA SINICA 36.1(2020):141-153.
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