The behavior of fluid mobile elements during serpentinization and dehydration of serpentinites in subduction zones

doi:10.18654/1000-0569/2020.01.14

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	The behavior of fluid mobile elements during serpentinization and dehydration of serpentinites in subduction zones
	Wu Kai 1; Yuan HongLin 1; Lyu Nan 1; Zhang LiPeng 2,3
刊名	ACTA PETROLOGICA SINICA
	2020
卷号	36 期号:1 页码:141-153
关键词	Subduction zones Fluid mobile elements Element fractionation Serpentinite Serpentinization
ISSN号	1000-0569
DOI	10.18654/1000-0569/2020.01.14
通讯作者	Wu Kai(wukai0302@gmail.com)
英文摘要	Serpentine 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.
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000533247400014
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/167463]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Wu Kai
作者单位	1.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 2.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanog, Qingdao 266071, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Marine Geol, Qingdao 266061, Peoples R China
推荐引用方式 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.