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The dominance of loess weathering on water and sediment chemistry within the Daihai Lake catchment, northeastern Chinese Loess Plateau
Zhang, F (Zhang, Fei)[ 1 ]; Jin, ZD (Jin, Zhangdong)[ 1,2 ]; Li, FC (Li, Fuchun)[ 3 ]; Yu, JM (Yu, Jimin)[ 4 ]; You, CF (You, Chen-Feng)[ 5 ]; Zhou, L (Zhou, Ling)[ 1 ]
2013-08-30
Source PublicationAPPLIED GEOCHEMISTRY
Volume35Pages:51-63
Subtype期刊论文
Abstract

This study investigated modern loess weathering and its control on the chemistry of surface water and sediment within the Daihai Lake catchment. The mineral types and the abundances of major and trace elements in loess, sediments and bedrocks were determined to ascertain the provenance of river sediment. The major cation compositions and Sr isotopic ratios of surface and subsurface waters were measured to distinguish the contributions of dissolved loads from various parent materials. The data show that mineralogical characteristics and elemental abundances of the river sediments are almost identical with those of the loess, but are different from the bedrocks, indicating that river sediments are predominantly derived from loess. River waters feeding Daihai Lake show a similar range in Sr-87/Sr-86 ratios as those of HOAc-soluble carbonate minerals in loess from the Chinese Loess Plateau. The slightly lower Sr-87/Sr-86 of river waters in the southern catchment relative to other rivers reflect potential weathering of large areas of outcropping basalt. These results imply that (1) surface processes are dominated by weathering of loess which only accounts for 18% of the total catchment area, and (2) loess weathering but not basalt controls the river Sr isotopic signature, although the latter covers a larger catchment area. For groundwater, Sr-87/Sr-86 ratios indicate that subsurface processes might be controlled by interactions with ambient lithology and hydrological flowpaths. Comparing the rivers draining the Chinese Loess Plateau with global rivers, both Mg/Ca and Sr-87/Sr-86 in the Daihai surprisingly agree well with those in the upper and downstream Huanghe (Yellow River), as well as HOAc-soluble loess, but differ significantly from other global rivers. This result reinforces the argument that loess weathering plays the most important role in controlling the sediment and water chemistry in the loess-covered areas, whereas the influence of bedrock weathering is minor. This study on modern processes might provide baselines to decipher down core records for paleoclimate reconstructions, especially for lake/river sediments in (semi-)arid areas.

DOI10.1016/j.apgeochem.2013.05.013
Indexed BySCI ; EI
Language英语
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Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10048
Collection加速器质谱中心
Corresponding AuthorJin, ZD (Jin, Zhangdong)[ 1,2 ]
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China;
2.School of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
3.College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China;
4.Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia;
5.Earth Dynamic System Research Center, National Cheng Kung University, Tainan 70101, Taiwan
Recommended Citation
GB/T 7714
Zhang, F ,Jin, ZD ,Li, FC ,et al. The dominance of loess weathering on water and sediment chemistry within the Daihai Lake catchment, northeastern Chinese Loess Plateau[J]. APPLIED GEOCHEMISTRY,2013,35:51-63.
APA Zhang, F ,Jin, ZD ,Li, FC ,Yu, JM ,You, CF ,&Zhou, L .(2013).The dominance of loess weathering on water and sediment chemistry within the Daihai Lake catchment, northeastern Chinese Loess Plateau.APPLIED GEOCHEMISTRY,35,51-63.
MLA Zhang, F ,et al."The dominance of loess weathering on water and sediment chemistry within the Daihai Lake catchment, northeastern Chinese Loess Plateau".APPLIED GEOCHEMISTRY 35(2013):51-63.
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