气候变化领域集成服务门户(CCPortal): Weathering in landslide-prone areas: Evidences from hydrochemistry and sulfur isotopic compositions in the Bailong River, northeastern Qinghai-Tibet Plateau

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DOI	10.1016/j.apgeochem.2023.105645
	Weathering in landslide-prone areas: Evidences from hydrochemistry and sulfur isotopic compositions in the Bailong River, northeastern Qinghai-Tibet Plateau
	Luo, Han; Zhong, Jun; Li, Si-Liang; Chen, Shuai; Ma, Tingting; Duan, Jianzhong
发表日期	2023
ISSN	0883-2927
EISSN	1872-9134
卷号	152
英文摘要	Investigating weathering processes in landslide-prone areas is important for understanding the carbon budget due to weathering during mountain building. Here, we present the monthly hydrochemistry and sulfur isotopic compositions of SO42-(delta 34S-SO42-) in the Bailong River which drained landslide-prone areas in the northeastern Qinghai-Tibet Plateau. Ca2+ and HCO3- were dominant in cations and anions respectively, and delta 34S-SO42-values varied over a narrow range, from 5.1 parts per thousand to 6.7 parts per thousand. We constrained the sources of major cations and SO42-through an inverse model and the mass balance model of delta 34S-SO42-. The results showed that cations in the Bailong River were mainly from carbonate weathering, and sulfide oxidation was an important source of SO42-. Weathering in the Bailong River catchment showed an CO2 source over geologic timescales due to the reaction of H2SO4. The relationship between weathering fluxes and physical erosion rate indicated that high runoff facilitated physical erosion, and in turn accelerated chemical weathering. However, under the conditions of extreme discharge and physical erosion, SO42-fluxes from sulfide oxidation were not as high as expected, which was ascribed to the transport of old landslide deposits where most sulfides had been exhausted. Therefore, in tectonically active areas with massive landslides, the high erosion rate caused by landslides promoted chemical weathering, but sulfide oxidation did not respond sensitively to strong physical erosion under high runoff conditions. This study helped to understand the relationship among landslides, chemical weathering, and geologic carbon cycle.
关键词	Chemical weathering Qinghai-Tibet Plateau Sulfide oxidation Landslide CO 2 budget
英文关键词	CO2 CONSUMPTION; SULFIDE OXIDATION; OXYGEN-ISOTOPE; SOLUTE SOURCES; XIJIANG RIVER; SILICATE; BASIN; CARBONATE; GEOCHEMISTRY; FLUXES
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:000976257700001
来源期刊	APPLIED GEOCHEMISTRY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282862
作者单位	Tianjin University; University of Hong Kong
推荐引用方式 GB/T 7714	Luo, Han,Zhong, Jun,Li, Si-Liang,et al. Weathering in landslide-prone areas: Evidences from hydrochemistry and sulfur isotopic compositions in the Bailong River, northeastern Qinghai-Tibet Plateau[J],2023,152.
APA	Luo, Han,Zhong, Jun,Li, Si-Liang,Chen, Shuai,Ma, Tingting,&Duan, Jianzhong.(2023).Weathering in landslide-prone areas: Evidences from hydrochemistry and sulfur isotopic compositions in the Bailong River, northeastern Qinghai-Tibet Plateau.APPLIED GEOCHEMISTRY,152.
MLA	Luo, Han,et al."Weathering in landslide-prone areas: Evidences from hydrochemistry and sulfur isotopic compositions in the Bailong River, northeastern Qinghai-Tibet Plateau".APPLIED GEOCHEMISTRY 152(2023).