气候变化领域集成服务门户(CCPortal): Hydrothermal systems with radiogenic Sr in the North Qaidam ultrahigh-pressure metamorphic belt, NE Tibetan Plateau and implications for regional dissolved Sr budget

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DOI	10.1016/j.apgeochem.2022.105214
	Hydrothermal systems with radiogenic Sr in the North Qaidam ultrahigh-pressure metamorphic belt, NE Tibetan Plateau and implications for regional dissolved Sr budget
	Liu, Yudong; Yang, Yibo; Song, Bowen; Galy, Albert; Zhang, Fei; Jin, Zhangdong; Zhang, Guibin; Ye, Chengcheng; Fang, Xiaomin
通讯作者	Yang, YB (通讯作者)
发表日期	2022
ISSN	0883-2927
EISSN	1872-9134
卷号	138
英文摘要	Hydrothermal systems, including hot springs and hydrothermal calcite, are common features of orogenic belts. The hot springs and hydrothermal calcite in the Himalayas are characterized by radiogenic Sr related to meta-morphic processes. Such metamorphism-driven processes have contributed significant amounts of radiogenic Sr to rivers and groundwater, which has affected the evolution of global seawater (SrSr)-Sr-87-Sr-/86 during the Cenozoic. However, whether such hydrothermal systems with highly radiogenic Sr occur in other continental collisional belts with intense metamorphism remains unknown, which hinders a better understanding of regional and global Sr cycles. Compiled (SrSr)-Sr-87-Sr-/86 ratios in surface water around the Tibetan Plateau show that the Qilian-North Qaidam region displays a higher (SrSr)-Sr-87-Sr-/86 ratio than other regions, except for the Himalayas. Here, we report (SrSr)-Sr-87-Sr-/86 ratios of a hydrothermal system on the northern margin of the early Paleozoic North Qaidam ultrahigh-pressure metamorphic belt, NE Tibetan Plateau. The high (SrSr)-Sr-87-Sr-/86 ratios (0.757-0.734) of the hot spring water and the acetic acid leachates of the surrounding rocks (gneiss and schist) with other isotopic tracers (e.g., oxygen, hydrogen, lithium, and boron isotopes) indicate that 1) Sr was exchanged during metamorphism between car-bonate and silicate phases in crustal rocks and the high (SrSr)-Sr-87-Sr-/86 ratio of the hot spring water was acquired from a deep water-rock reaction process; and 2) hydrothermal systems around the Qilian-North Qaidam region operate like those in the Himalayas. Mass balance calculations indicate that the metamorphism-forced hydro-thermal system plays a key role in delivering radiogenic Sr to rivers and lakes and yielding higher (SrSr)-Sr-87-Sr-/86/Sr-86 ratios in surface water around the Qilian Shan region than in the surrounding areas. The reactivated early Paleozoic Qilian orogenic belts with ultrahigh-pressure metamorphism caused by the India-Asia collision have significantly impacted the regional water (SrSr)-Sr-87-Sr-/86 ratio, suggesting that the reactivated old orogenic belts with intense metamorphic processes formed by continental subduction/collision can play a pivotal role in regulating past seawater (SrSr)-Sr-87-Sr-/86 evolution.
关键词	WEATHERING PROCESSES RIVER WATERS STRONTIUM ISOTOPES TECTONIC EVOLUTION HIMALAYAN RIVERS NANGA-PARBAT QILIAN SHAN SALT LAKES NW CHINA BASIN
英文关键词	(SrSr)-Sr-87-Sr-/86 ratio ; Hot spring; Qilian Shan; Qaidam Basin
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000799035900004
来源期刊	APPLIED GEOCHEMISTRY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260741
推荐引用方式 GB/T 7714	Liu, Yudong,Yang, Yibo,Song, Bowen,et al. Hydrothermal systems with radiogenic Sr in the North Qaidam ultrahigh-pressure metamorphic belt, NE Tibetan Plateau and implications for regional dissolved Sr budget[J]. 中国科学院青藏高原研究所,2022,138.
APA	Liu, Yudong.,Yang, Yibo.,Song, Bowen.,Galy, Albert.,Zhang, Fei.,...&Fang, Xiaomin.(2022).Hydrothermal systems with radiogenic Sr in the North Qaidam ultrahigh-pressure metamorphic belt, NE Tibetan Plateau and implications for regional dissolved Sr budget.APPLIED GEOCHEMISTRY,138.
MLA	Liu, Yudong,et al."Hydrothermal systems with radiogenic Sr in the North Qaidam ultrahigh-pressure metamorphic belt, NE Tibetan Plateau and implications for regional dissolved Sr budget".APPLIED GEOCHEMISTRY 138(2022).