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Intracontinental and arc-related hydrothermal systems display distinct delta Hg-202 and Delta Hg-199 features: Implication for large-scale mercury recycling and isotopic fractionation in different tec
Changzhou Deng; Bernd Lehmann; Tingting Xiao; Qinping Tan; Di Chen; Zhendong Tian; Xueyun Wang; Guangyi Sun; Runsheng Yin
2022
Source PublicationEarth and Planetary Science Letters
Volume593Pages:117646
Abstract

Mercury isotopes display both mass-dependent and mass-independent fractionation and allow the tracing of pathways and storage of surface-derived Hg in the lithosphere. While the subduction-related orogenic recycling of Hg from marine reservoirs into hydrothermal systems in continental arc settings has been documented recently, the source of Hg in intracontinental hydrothermal systems remains unclear. We measured Hg isotopes in two intracontinental anorogenic/postorogenic Late Mesozoic hydrothermal gold deposits in the South China craton and the Central Asian orogenic belt of northern China, respectively. The ore and sulfide samples from the studied systems have positive δ202Hg (0.70 ± 0.39‰, 1SD, n = 49) and negative Δ199Hg values (−0.12 ± 0.05‰, 1SD, n = 49). These values are different from their country rocks and regional geological environment (volcanic arc granites, marine sedimentary rocks) which have positive Δ199Hg values, but similar to that of their Precambrian supracrustal basement rocks of largely non-marine continental materials. We conclude that Hg in the intracontinental hydrothermal systems was leached from basement rocks by upper crustal basinal fluid circulation driven by regional heat flow, likely due to lithospheric thinning and upwelling of the asthenosphere in the Late Mesozoic. The intracontinental hydrothermal systems and their continental sources with positive δ202Hg and negative Δ199Hg values are complementary to volcanic-arc and marine sedimentary rocks with opposite δ202Hg - Δ199Hg compositions. The distinct Hg isotopic features of hydrothermal systems in different tectonic settings, in particular the indelible Δ199Hg signature, allow the tracing of large-scale material cycling in the Earth.

DOI10.1016/j.epsl.2022.117646
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Indexed BySCI
Language英语
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Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/13530
Collection矿床地球化学国家重点实验室
环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.Mineral Resources, Technical University of Clausthal, Clausthal-Zellerfeld, Germany
3.University of Chinese Academy of Sciences, Beijing, 100049, China
4.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Recommended Citation
GB/T 7714
Changzhou Deng,Bernd Lehmann,Tingting Xiao,et al. Intracontinental and arc-related hydrothermal systems display distinct delta Hg-202 and Delta Hg-199 features: Implication for large-scale mercury recycling and isotopic fractionation in different tec[J]. Earth and Planetary Science Letters,2022,593:117646.
APA Changzhou Deng.,Bernd Lehmann.,Tingting Xiao.,Qinping Tan.,Di Chen.,...&Runsheng Yin.(2022).Intracontinental and arc-related hydrothermal systems display distinct delta Hg-202 and Delta Hg-199 features: Implication for large-scale mercury recycling and isotopic fractionation in different tec.Earth and Planetary Science Letters,593,117646.
MLA Changzhou Deng,et al."Intracontinental and arc-related hydrothermal systems display distinct delta Hg-202 and Delta Hg-199 features: Implication for large-scale mercury recycling and isotopic fractionation in different tec".Earth and Planetary Science Letters 593(2022):117646.
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