Arid
DOI10.1016/j.apgeochem.2013.05.013
The dominance of loess weathering on water and sediment chemistry within the Daihai Lake catchment, northeastern Chinese Loess Plateau
Zhang, Fei1; Jin, Zhangdong1,2; Li, Fuchun3; Yu, Jimin4; You, Chen-Feng5; Zhou, Ling1
通讯作者Jin, Zhangdong
来源期刊APPLIED GEOCHEMISTRY
ISSN0883-2927
出版年2013
卷号35页码:51-63
英文摘要

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. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.


类型Article
语种英语
国家Peoples R China ; Australia ; Taiwan
收录类别SCI-E
WOS记录号WOS:000322065800007
WOS关键词RIVER-WATER ; DISSEMINATED CALCITE ; ISOTOPIC-RATIOS ; INNER-MONGOLIA ; NORTH CHINA ; SR ISOTOPE ; GEOCHEMISTRY ; PROVENANCE ; ND ; DEPOSITS
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
来源机构中国科学院地球环境研究所
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/175775
作者单位1.Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian 710075, Peoples R China;
2.Xi An Jiao Tong Univ, Sch Human Settlement & Civil Engn, Xian 710049, Peoples R China;
3.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Jiangsu, Peoples R China;
4.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia;
5.Natl Cheng Kung Univ, Earth Dynam Syst Res Ctr, Tainan 70101, Taiwan
推荐引用方式
GB/T 7714
Zhang, Fei,Jin, Zhangdong,Li, Fuchun,et al. The dominance of loess weathering on water and sediment chemistry within the Daihai Lake catchment, northeastern Chinese Loess Plateau[J]. 中国科学院地球环境研究所,2013,35:51-63.
APA Zhang, Fei,Jin, Zhangdong,Li, Fuchun,Yu, Jimin,You, Chen-Feng,&Zhou, Ling.(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, Fei,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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