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  4. 岩石圈演化国家重点实验室
Thallium isotope compositions of subduction-zone fluids: Insights from ultra-high pressure eclogites and veins in the Dabie terrane, eastern China

文献类型：期刊论文

作者Shu, Yunchao1,2,3; Nielsen, Sune G.2,4; Le Roux, Veronique4; Blusztajn, Jerzy2; Guo, Shun5; Huang, Fang1,6
刊名CHEMICAL GEOLOGY
出版日期2022-06-20
卷号599页码:13
关键词Thallium isotopes Eclogites Metamorphic vein Phengite Subduction-zone fluids Dabie orogen
ISSN号0009-2541
DOI10.1016/j.chemgeo.2022.120843
英文摘要Dehydration of the subducted slab is a crucial process in the generation of arc magmas. However, the mineralogical controls of slab dehydration remain uncertain. Thallium (Tl) isotopes have emerged as tracers of sub ducted slab components, but the Tl isotope characteristics of slab fluids are not known. High-pressure metamorphic veins and host eclogites in the Dabie terrane (China) provide important information on the composition and evolution of subduction zone fluids. In this study, we present the first Tl concentration and Tl isotope data for two high-pressure metamorphic epidote-rich veins formed through breakdown of lawsonite, as well as host eclogites and phengite separates, from the Ganghe and Hualiangting areas. The high Tl concentrations in phengite separates and identical Tl isotope compositions between phengites and their host bulk eclogites demonstrate that phengite controls the overall inventory of Tl in the host eclogites. Generally, the vein samples from both areas have much lower Tl concentrations than their host eclogites, suggesting that the fluids from which the veins precipitated were derived from phengite-bearing eclogites that retained Tl in the residue. The Ganghe eclogites display similar Tl isotope compositions compared with Ganghe omphacite-epidote vein. This similarity indicates that the vein-forming fluid was likely derived from the host eclogites, and that Tl isotopes did not fractionate during fluid-release. Three generations of veins in the Hualiangting area record variable Tl isotope values and were likely derived from multi-stage dehydration of heterogeneous host eclogites, some of which may have contained a sediment component. We argue that fluids derived from eclogite dehydration are likely characterized by higher Cs/Tl ratios compared to their host eclogites. Arc magmas that display high Cs/Tl (i.e. >15) that cannot be caused by variations in slab source composition, coupled with relatively low Ba/Th ratios, are likely to directly record the presence of residual phengite at subarc depths.
WOS关键词TRACE-ELEMENT SIGNATURE ; NORTH CHINA ; GEOCHEMICAL EVOLUTION ; CHEMICAL GEODYNAMICS ; METAMORPHIC ROCKS ; VOLCANIC-ROCKS ; CONSTRAINTS ; DEHYDRATION ; BEHAVIOR ; ORIGIN
资助项目National Natural Science Foundation of China[41903008] ; National Natural Science Foundation of China[41922013] ; China Postdoctoral Science Foundation[2019M660153] ; NSF[EAR-1839128] ; NSF[EAR-1829546]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000788798800004
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; NSF ; NSF ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; NSF ; NSF ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; NSF ; NSF ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; NSF ; NSF
源URL[http://ir.iggcas.ac.cn/handle/132A11/105156]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Shu, Yunchao; Nielsen, Sune G.
作者单位1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
2.Woods Hole Oceanog Inst, NIRVANA Nontradit Isotope Res Various Adv Novel A, Woods Hole, MA 02543 USA
3.Okayama Univ, Inst Planetary Mat, Pheast Mem Lab Geochem & Cosmochem, Misasa, Tottori 6820193, Japan
4.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
6.Univ Sci & Technol China, CAS Ctr Excellence Comparat Planetol, Hefei 230026, Anhui, Peoples R China
推荐引用方式
GB/T 7714		 Shu, Yunchao,Nielsen, Sune G.,Le Roux, Veronique,et al. Thallium isotope compositions of subduction-zone fluids: Insights from ultra-high pressure eclogites and veins in the Dabie terrane, eastern China[J]. CHEMICAL GEOLOGY,2022,599:13.
APA Shu, Yunchao,Nielsen, Sune G.,Le Roux, Veronique,Blusztajn, Jerzy,Guo, Shun,&Huang, Fang.(2022).Thallium isotope compositions of subduction-zone fluids: Insights from ultra-high pressure eclogites and veins in the Dabie terrane, eastern China.CHEMICAL GEOLOGY,599,13.
MLA Shu, Yunchao,et al."Thallium isotope compositions of subduction-zone fluids: Insights from ultra-high pressure eclogites and veins in the Dabie terrane, eastern China".CHEMICAL GEOLOGY 599(2022):13.

入库方式： OAI收割

来源：地质与地球物理研究所

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