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Riverine Mg isotopes response to glacial weathering within the Muztag catchment of the eastern Pamir Plateau

文献类型：期刊论文

作者Li, Liangbo1,2; Zhang, Fei1,3; Jin, Zhangdong1,3,4; Xiao, Jun1,3; Gou, Long-Fei1,2; Xu, Yang1,2
刊名APPLIED GEOCHEMISTRY
出版日期2020-07-01
卷号118页码:13
关键词Glacial catchment Mg isotopes Fractionation and source Carbonate weathering Eastern pamir
ISSN号0883-2927
DOI10.1016/j.apgeochem.2020.104626
通讯作者Zhang, Fei(zhangfei@ieecas.cn) ; Jin, Zhangdong(zhdjin@ieecas.cn)
英文摘要It has been proposed that the riverine Mg isotopes are sensitive to primary mineral dissolution and the formation of secondary minerals and are served as an effective tracer for chemical weathering. Glacial comminution can produce fresh mineral surfaces that provide easily leached cations to the rivers and thus could potentially modify the riverine Mg isotopic behavior. However, the mechanism controlling riverine Mg isotopes under glacial environment is poorly constrained. Here we investigated Mg and Sr isotopic compositions of river and spring waters, bedrocks and sediments within the glacial-covered Murtag catchment in the northeastern Pamir Plateau. The delta Mg-26 and Sr-87/Sr-86 values of dissolved loads along the mainstream increased from -1.56 parts per thousand and 0.713050 at the glacier margin to -1.12 parts per thousand and 0.713855 at the downstream, respectively, both showing strong negative correlation with elevation. The lower delta Mg-26 but higher molar Ca/Mg and Ca/Na ratios of glacial river waters than those of non-glacial rivers indicate a preferential dissolution of carbonates under glacial environment, further supported by a negative liner correlation between delta Mg-26 and carbonate weathering proportion. In contrast, the high delta Mg-26 but low Ca/Mg and Ca/Na ratios at the downstream reflect an increased input of silicate weathering. Saturation state modelling suggests little chance of secondary mineral formation and limited impact on the Mg isotopic behavior in glacial rivers, characterized by low ionic concentrations and short water residence time. These observations, together with complied data from other glacial rivers, suggest preferential carbonate weathering under glacial environment could directly release low Mg isotopes to river water, different from the process of Mg isotopic fractionation by secondary mineral formation. Our findings would provide insight in carbonate weathering regulating riverine Mg isotopic evolution and its potential influence on global carbon cycle, in particular under present warming scenario.
WOS关键词CO2 CONSUMPTION ; ATMOSPHERIC CO2 ; TIBETAN-PLATEAU ; CHEMICAL DENUDATION ; SEASONAL-VARIATIONS ; CARBON-DIOXIDE ; EROSION RATES ; CENTRAL-ASIA ; MAGNESIUM ; FRACTIONATION
资助项目National Natural Science Foundation of China[41991322] ; National Natural Science Foundation of China[41403111] ; Youth Innovation Promotion Association of CAS[E029070299] ; West Light Foundation of CAS[529061299]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000544889100006
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China ; Youth Innovation Promotion Association of CAS ; West Light Foundation of CAS
源URL[http://ir.ieecas.cn/handle/361006/15010]  
专题地球环境研究所_加速器质谱中心
第四纪科学与全球变化卓越创新中心
通讯作者Zhang, Fei; Jin, Zhangdong
作者单位1.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Xian 710061, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
4.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Peoples R China
推荐引用方式
GB/T 7714		 Li, Liangbo,Zhang, Fei,Jin, Zhangdong,et al. Riverine Mg isotopes response to glacial weathering within the Muztag catchment of the eastern Pamir Plateau[J]. APPLIED GEOCHEMISTRY,2020,118:13.
APA Li, Liangbo,Zhang, Fei,Jin, Zhangdong,Xiao, Jun,Gou, Long-Fei,&Xu, Yang.(2020).Riverine Mg isotopes response to glacial weathering within the Muztag catchment of the eastern Pamir Plateau.APPLIED GEOCHEMISTRY,118,13.
MLA Li, Liangbo,et al."Riverine Mg isotopes response to glacial weathering within the Muztag catchment of the eastern Pamir Plateau".APPLIED GEOCHEMISTRY 118(2020):13.

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来源：地球环境研究所

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