气候变化领域集成服务门户(CCPortal): Deep-sourced CO2 emissions from the Eastern Himalaya Syntaxis and the Tengchong Volcanic Field, southeast Tibet

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DOI	10.1016/j.chemgeo.2023.121888
	Deep-sourced CO2 emissions from the Eastern Himalaya Syntaxis and the Tengchong Volcanic Field, southeast Tibet
	Li, Jujing; Guo, Zhengfu; Zhang, Maoliang; Zhao, Wenbin; Dingwell, Donald B.; Zheng, Guodong; Sun, Yutao; Cheng, Zhihui
发表日期	2024
ISSN	0009-2541
EISSN	1872-6836
卷号	645
英文摘要	The India-Asia collision zone is believed to play a central role in Earth's geological carbon budget. The processes controlling soil CO2 flux and mechanism at this continental subduction zone margin remain however poorly constrained. Here, we focus on hydrothermal CO2 emissions from southeast Tibet, specifically from the Eastern Himalaya Syntaxis (EHS) and the Tengchong Volcanic Field (TVF), with the twin goals of informing models of carbon cycling and ascertaining the source of hydrothermal degassing systems. In-situ measurements of soil CO2 flux from the Aqiong, Caquka, Nongchaka, Rongduo, and Woka hydrothermal fields of the EHS yield average soil CO2 fluxes of 72, 5, 13, 66, and 10 g m(-2) day(-1), respectively. Regional heat flow, tectonic regimes, and CO2 content in the spring gas are plausible controlling factors for soil CO2 flux, which is crucial to quantifying total CO2 output in continental collision zones. The compositions and He-C-N isotopes of hydrothermal volatiles from two study regions are reported here as well. Analysis of the He-C-N isotopes in terms of distances to the Jiali fault and the nearest Holocene volcano confirms that the Jiali fault and Holocene volcanoes have a significant impact on discharging deep-sourced CO2 from the EHS and TVF hydrothermal systems to the surface. The He-3/He-4 values of EHS hydrothermal volatiles (92 to 98 degrees E), combined with previous data (82 to 92 degrees E), show a clear increasing trend from south to north. Thus, we propose an updated model of enriched mantle wedge source for the EHS hydrothermal volatiles, based on multi-component mixing calculations of the He-CO2 systematics. The EHS hydrothermal volatiles exhibit systematics spatial variations from the core location to the bilateral segments, suggesting the highest He-3/He-4 ratio and carbonate-rich characteristics at the core location possibly controlled by the asthenosphere upwelling caused by the deep fragmentation structure.
英文关键词	CARBON-ISOTOPE SYSTEMATICS; HOT-SPRING GASES; GEOTHERMAL FIELDS; MAFIC MAGMATISM; MANTLE FLUIDS; LOWER CRUST; HELIUM; SUBDUCTION; FLUX; CONSTRAINTS
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001146615500001
来源期刊	CHEMICAL GEOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283225
作者单位	Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Tianjin University; University of Munich; China University of Geosciences - Wuhan; Hebei GEO University; LingNan Normal University
推荐引用方式 GB/T 7714	Li, Jujing,Guo, Zhengfu,Zhang, Maoliang,et al. Deep-sourced CO2 emissions from the Eastern Himalaya Syntaxis and the Tengchong Volcanic Field, southeast Tibet[J],2024,645.
APA	Li, Jujing.,Guo, Zhengfu.,Zhang, Maoliang.,Zhao, Wenbin.,Dingwell, Donald B..,...&Cheng, Zhihui.(2024).Deep-sourced CO2 emissions from the Eastern Himalaya Syntaxis and the Tengchong Volcanic Field, southeast Tibet.CHEMICAL GEOLOGY,645.
MLA	Li, Jujing,et al."Deep-sourced CO2 emissions from the Eastern Himalaya Syntaxis and the Tengchong Volcanic Field, southeast Tibet".CHEMICAL GEOLOGY 645(2024).