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Thallium isotope compositions of subduction-zone fluids: Insights from ultra-high pressure eclogites and veins in the Dabie terrane, eastern China
Shu, Yunchao1,2,3; Nielsen, Sune G.2,4; Le Roux, Veronique4; Blusztajn, Jerzy2; Guo, Shun5; Huang, Fang1,6
2022-06-20
Source PublicationCHEMICAL GEOLOGY
ISSN0009-2541
Volume599Pages:13
AbstractDehydration 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.
KeywordThallium isotopes Eclogites Metamorphic vein Phengite Subduction-zone fluids Dabie orogen
DOI10.1016/j.chemgeo.2022.120843
Funding OrganizationNational 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
WOS KeywordTRACE-ELEMENT SIGNATURE ; NORTH CHINA ; GEOCHEMICAL EVOLUTION ; CHEMICAL GEODYNAMICS ; METAMORPHIC ROCKS ; VOLCANIC-ROCKS ; CONSTRAINTS ; DEHYDRATION ; BEHAVIOR ; ORIGIN
Language英语
Funding ProjectNational Natural Science Foundation of China[41903008] ; National Natural Science Foundation of China[41922013] ; China Postdoctoral Science Foundation[2019M660153] ; NSF[EAR-1839128] ; NSF[EAR-1829546]
Funding OrganizationNational 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
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000788798800004
PublisherELSEVIER
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105156
Collection岩石圈演化国家重点实验室
Corresponding AuthorShu, Yunchao; Nielsen, Sune G.
Affiliation1.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
Recommended Citation
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.
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