Geochemical constraints on origin of hydrothermal volatiles from southern Tibet and the Himalayas: Understanding the degassing systems in the India-Asia continental subduction zone
文献类型：期刊论文
| 作者 | Zhang, Maoliang; Guo, Zhengfu; Zhang, Lihong; Sun, Yutao; Cheng, Zhihui |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2017-10-10 |
| 卷号 | 469页码:19-33 |
| 关键词 | Gas geochemistry Enriched mantle source Hydrothermal degassing systems Continental subduction zone Southern Tibet and the Himalayas |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2017.02.023 |
| 文献子类 | Article |
| 英文摘要 | Hydrothermal activities (e. g., hot springs and geysers) are extensively distributed in southern Tibet and the Himalayas, forming an east-west trending, similar to 2000-km-long, hydrothermal belt that represents the ongoing degassing systems in the India-Asia continental subduction zone (IACSZ). In this study, we report new data of chemical compositions and He-C-N isotopes for gas samples fromrepresentative hot springs in the hydrothermal belt, aimed at understanding volatile origin of the hydrothermal degassing systems in the IACSZ and their tectonic implications. According to spatial location, the samples are divided into western, central and eastern subgroups, which display spatially discernible geochemical characteristics, such as He-3/He-4 and CO2/He-3 ratios. The essential components required for volatile evolution include silicate rocks, carbonate rocks, sedimentary organicmatter and amantle-derived end-member, which are all expected in the IACSZ following a tectonicmodel incorporating an accretionary wedge and a magmatic front. On the basis of He-C-N isotope mixing calculations, together with constraints from petrogeochemical and geophysical studies, an enriched mantle wedge (EMW) is proposed as a potential candidate for the source of the mantle-derived components, which highlights the importance of recycled Indian continental materials compared to previous models that do not take this possibility for mantle source enrichment in account. The regional crustal rock assemblages composed of silicate rocks, carbonate rocks and sedimentary organicmatter are interpreted as contaminants of the EMW-derived volatiles (as exemplified by degassing systems in the magmatic front) or as source materials of hydrothermal volatiles from degassing systems in the accretionarywedge. Following tectonic framework of the IACSZ, we suggest that spatial variations in volatile geochemistry (e. g., He-3/He-4) are predominantly controlled by tectonic affinities (i.e., the accretionary wedge and magmatic front) of the hydrothermal degassing systems in southern Tibet and the Himalayas. The crustal-like He-3/He-4 ratios and high N-2 and He-4 contents agree well with the high sedimentary contributions to degassing systems in the accretionary wedge (including the Himalayas and fore-arc basins), whereas the high mantle-derived helium emissions in southern Tibet exhibit close affinities with contributions from the EMW-derived melts beneath the magmatic front. Moreover, regional fault systemswith variable scales and depths of penetrationwould act as an extra factor thatmay perturb the across-IACSZ profile of He-3/He-4 ratios controlled by tectonic settings. Our interpretation on degassing systems in southern Tibet and theHimalayas may have the potential to provide constraints fromvolatile geochemistry for understanding material recyclingmechanism and tectonic settings of the IACSZ. (C) 2017 Elsevier B.V. All rights reserved. |
| WOS关键词 | DEEP CARBON-CYCLE ; EASTERN LHASA TERRANE ; RICH MAFIC MAGMATISM ; ZIRCON U-PB ; BENEATH SOUTHERN ; COLLISION ZONES ; NOBLE-GASES ; LITHOSPHERIC DELAMINATION ; MAGNETOTELLURIC DATA ; ISOTOPE SYSTEMATICS |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000412553200003 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | Strategic Priority Research Program (B) of Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41572321 ; 41602341) ; Strategic Priority Research Program (B) of Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41572321 ; 41602341) ; Strategic Priority Research Program (B) of Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41572321 ; 41602341) ; Strategic Priority Research Program (B) of Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China(41572321 ; 41602341) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/61989]  |
| 专题 | 地质与地球物理研究所_中国科学院新生代地质与环境重点实验室 |
| 通讯作者 | Guo, Zhengfu |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Maoliang,Guo, Zhengfu,Zhang, Lihong,et al. Geochemical constraints on origin of hydrothermal volatiles from southern Tibet and the Himalayas: Understanding the degassing systems in the India-Asia continental subduction zone[J]. CHEMICAL GEOLOGY,2017,469:19-33. |
| APA | Zhang, Maoliang,Guo, Zhengfu,Zhang, Lihong,Sun, Yutao,&Cheng, Zhihui.(2017).Geochemical constraints on origin of hydrothermal volatiles from southern Tibet and the Himalayas: Understanding the degassing systems in the India-Asia continental subduction zone.CHEMICAL GEOLOGY,469,19-33. |
| MLA | Zhang, Maoliang,et al."Geochemical constraints on origin of hydrothermal volatiles from southern Tibet and the Himalayas: Understanding the degassing systems in the India-Asia continental subduction zone".CHEMICAL GEOLOGY 469(2017):19-33. |
入库方式： OAI收割
来源：地质与地球物理研究所
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