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学科主题: Geology
题名: Chemical weathering of monsoonal eastern China: implications from major elements of topsoil
作者: Qiu, SF ; Zhu, ZY ; Yang, T ; Wu, Y ; Bai, Y ; Ouyang, TP
通讯作者: qiushifan@126.com ; zhuzy@gig.ac.cn
关键词: Chemical weathering ; Monsoonal eastern China ; Topsoil ; Major elements
刊名: JOURNAL OF ASIAN EARTH SCIENCES
发表日期: 2014
卷: 81, 页:77-90
收录类别: sci
部门归属: [Qiu, Shifan ; Zhu, Zhaoyu ; Bai, Yang ; Ouyang, Tingping] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Guangdong, Peoples R China ; [Qiu, Shifan ; Bai, Yang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China ; [Yang, Tian] Guangxi Normal Univ, Coll Environm & Resources, Guilin 541004, Peoples R China ; [Wu, Yi] Chinese Acad Sci, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China
项目归属: 海洋地质
资助者: National Basic Research Program of China [2010CB833405]; National Natural Science Foundation of China [40872111, 40930106]
摘要: Major element compositions of 36 bulk samples and 41 clay samples, which were obtained from 47 topsoils collected in monsoonal eastern China, were investigated with conventional wet chemistry and X-ray fluorescence (XRF) spectrometry, respectively. Based on major element analyses, the mobility of major elements and latitudinal distributions of SiO2/Al2O3 ratio, chemical index of alteration (CIA), chemical index of weathering (CIW) and weathering index of Parker (WIP) were analyzed. Meanwhile, the suitability of these chemical weathering indices to topsoils in monsoonal eastern China and its controls were discussed. These investigations indicate that Na, K, Ca, Mg, and Si are relatively depleted, while Mn, P, Fe and Ti are relatively enriched in topsoils of the study area by comparison with their contents in the upper continent crust (UCC), and that alkali metal (Na, K) and alkaline earth metal (Ca, Mg) elements are generally easier to be depleted from their parent materials than other major elements during chemical weathering. The latitudinal distributions of CIA, CIW and WIP show that they are suitable to both bulk and clay samples, but SiO2/Al2O3 is only suitable to clay samples, not suitable in bulk ones. All these investigations indicate a significant dependence of grain-size in major element abundance and latitudinal distributions of SiO2/Al2O3, CIA, CIW and WIP, but parent rock type has little effect on them, except its impact on the latitudinal distribution of WIP in clay samples. The significant grain-size dependence probably indicates the presence of unaltered minerals in bulk samples, thus we suggest that clay samples are more suitable to investigating chemical weathering of sediments on continents than bulk samples. The trivial effect of parent rock type probably indicates a relatively uniform chemical weathering on various parent rocks. Correlation analyses indicate that climate is the dominant control of chemical weathering of topsoils in the study area, and the significant latitude effect indicated by the spatial distributions of chemical weathering indices actually reflect the climate control on chemical weathering of topsoils. Chemical weathering indices actually reflect the integrated weathering history in the study area. Besides the dominant control of climate, other factors like tectonics, parent rock, biology, landform and soil depth and age might also have some effect on the chemical weathering of topsoils in the study area, which needs further research. (C) 2013 Elsevier Ltd. All rights reserved.
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WOS记录号: WOS:000331483300007
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10647
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Qiu, SF; Zhu, ZY; Yang, T; Wu, Y; Bai, Y; Ouyang, TP.Chemical weathering of monsoonal eastern China: implications from major elements of topsoil,JOURNAL OF ASIAN EARTH SCIENCES,2014,81():77-90
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