Zircon Solubility in Solute-Rich Supercritical Fluids and Zr Transfer From Slab to Wedge in the Deep Subduction Process

doi:10.1029/2021JB021970

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	Zircon Solubility in Solute-Rich Supercritical Fluids and Zr Transfer From Slab to Wedge in the Deep Subduction Process
	Chen, Wei 2,3,4,5; Xiong, Xiaolin 1,3,4,5; Takahashi, Eiichi 3,4
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2021-09-01
卷号	126 期号:9 页码:16
关键词	deep subduction supercritical fluid zircon solubility Zr transfer
ISSN号	2169-9313
DOI	10.1029/2021JB021970
通讯作者	Xiong, Xiaolin(xiongxl@gig.ac.cn)
英文摘要	Zircon solubility in aqueous fluids, hydrous melts, and supercritical fluids is important for understanding the high field strength elements (HFSEs) chemical transport in subduction zones. Although zircon solubility was extensively studied in aqueous fluids and hydrous silicate melts, its solubility in solute-rich fluids or supercritical fluids is poorly known. Here, we experimentally determined zircon solubility in KAlSi3O8 (+/- K2O +/- Al2O3) - H2O supercritical fluids at 2.0-6.0 GPa and 800 degrees C-1000 degrees C, close to the slab-top conditions at sub-arc depths. The results show that zircon solubility (expressed as ZrO2 content at zircon saturation) ranges from 65 to 6,400 ppm ZrO2, 10-100 times higher than that in dilute aqueous fluids; it increases with temperature, solute content, and solute alkalinity (molar K/Al ratio) but decreases with pressure. The experiments at 2.0 GPa show that solute alkalinity in addition to temperature and solute content exerts a primary control on zircon solubility, while the experiments at 4.0-6.0 GPa show that the negative effect of pressure on zircon solubility is offset by the increase in solute alkalinity due to the crystallization of Al-rich phases kyanite and muscovite. We suggest that high-alkali supercritical fluids during deep subduction could be significant transfer agents for Zr from slab to mantle wedge.
资助项目	National Key Research and Development Program of China[2018YFA0702704] ; NSFC[92062222] ; NSFC[41573053] ; NSFC[41921003] ; NSFC[42003049] ; [QYZDJ-SSW-DQC012] ; [GML2019ZD0202]
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000703087900032
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/176485]
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	Xiong, Xiaolin
作者单位	1.Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Deep Sea Res Ctr, Qingdao, Peoples R China 3.CAS Ctr Excellence Deep Earth Sci, Guangzhou, Peoples R China 4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China 5.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Chen, Wei,Xiong, Xiaolin,Takahashi, Eiichi. Zircon Solubility in Solute-Rich Supercritical Fluids and Zr Transfer From Slab to Wedge in the Deep Subduction Process[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2021,126(9):16.
APA	Chen, Wei,Xiong, Xiaolin,&Takahashi, Eiichi.(2021).Zircon Solubility in Solute-Rich Supercritical Fluids and Zr Transfer From Slab to Wedge in the Deep Subduction Process.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,126(9),16.
MLA	Chen, Wei,et al."Zircon Solubility in Solute-Rich Supercritical Fluids and Zr Transfer From Slab to Wedge in the Deep Subduction Process".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 126.9(2021):16.