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A similar to 6 Ma chemical weathering history, the grain size dependence of chemical weathering intensity, and its implications for provenance change of the Chinese loess-red clay deposit

文献类型：期刊论文

作者Xiong, Shangfa; Ding, Zhongli; Zhu, Yuanjian; Zhou, Ru; Lu, Haijian
刊名QUATERNARY SCIENCE REVIEWS
出版日期2010-07-01
卷号29期号:15-16页码:1911-1922
ISSN号0277-3791
DOI10.1016/j.quascirev.2010.04.009
文献子类Article
英文摘要Major element chemical analyses of the Baishui loess-red clay sequence (35 degrees 24' 10 '' N, 106 degrees 54' 43 '' E, Gansu Province, China) reveal that, the chemical weathering intensities inferred from CIA (chemical index of alteration) values have progressively weakened and increased in amplitude with decreasing age. The general trend of the CIA can be correlated well with the oxygen isotope variations of the deep sea sediments. Analyses of multiple size fractions (<5 mu m, 5-20 mu m and 20-63 mu m) indicate that the CIA and the major element abundances are strongly grain size dependent. The chemical alternation of all three size fractions is relatively weak, and the long-term variation in chemical composition of the loess red clay is mainly controlled by the mixing of fresh detritus from different source areas. The CIA variability of the coarse fractions (5-20 pm and 20-63 pm) within the section is apparently different from that of the fine fraction (<5 pm), implying a different erosion transportation deposition weathering history. From 1 Ma onward, CIA values for all size fractions decrease, indicating an increasing input of fresh or poorly weathered detritus in the desert source regions of loess deposits. Sequential variations in the K(2)O/Al(2)O(3), Na(2)O/Al(2)O(3), CaO/Al(2)O(3) and MgO/Al(2)O(3) ratios from 4.5 Ma to about 0.6 Ma in bulk and size fractioned samples may reflect provenance change as well as changing chemical weathering processes. (C) 2010 Elsevier Ltd. All rights reserved.
WOS关键词NORTHERN-HEMISPHERE GLACIATION ; ASIAN WINTER MONSOON ; ISOTOPIC VARIATIONS ; CONTINENTAL-CRUST ; SILICATE ROCKS ; SOURCE AREAS ; DESERT SAND ; MYR AGO ; PLATEAU ; SR
WOS研究方向Physical Geography ; Geology
语种英语
WOS记录号WOS:000279758400016
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Chinese Academy of Sciences(KZCX2-YW-130 ; Chinese Academy of Sciences(KZCX2-YW-130 ; National Natural Science Foundation of China(40972226 ; National Natural Science Foundation of China(40972226 ; KZCX2-YW-Q05 ; KZCX2-YW-Q05 ; 40672117) ; 40672117) ; KZCX2-SW-133) ; KZCX2-SW-133) ; Chinese Academy of Sciences(KZCX2-YW-130 ; Chinese Academy of Sciences(KZCX2-YW-130 ; National Natural Science Foundation of China(40972226 ; National Natural Science Foundation of China(40972226 ; KZCX2-YW-Q05 ; KZCX2-YW-Q05 ; 40672117) ; 40672117) ; KZCX2-SW-133) ; KZCX2-SW-133) ; Chinese Academy of Sciences(KZCX2-YW-130 ; Chinese Academy of Sciences(KZCX2-YW-130 ; National Natural Science Foundation of China(40972226 ; National Natural Science Foundation of China(40972226 ; KZCX2-YW-Q05 ; KZCX2-YW-Q05 ; 40672117) ; 40672117) ; KZCX2-SW-133) ; KZCX2-SW-133) ; Chinese Academy of Sciences(KZCX2-YW-130 ; Chinese Academy of Sciences(KZCX2-YW-130 ; National Natural Science Foundation of China(40972226 ; National Natural Science Foundation of China(40972226 ; KZCX2-YW-Q05 ; KZCX2-YW-Q05 ; 40672117) ; 40672117) ; KZCX2-SW-133) ; KZCX2-SW-133)
源URL[http://ir.iggcas.ac.cn/handle/132A11/73460]  
专题中国科学院地质与地球物理研究所
通讯作者Xiong, Shangfa
作者单位Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Xiong, Shangfa,Ding, Zhongli,Zhu, Yuanjian,et al. A similar to 6 Ma chemical weathering history, the grain size dependence of chemical weathering intensity, and its implications for provenance change of the Chinese loess-red clay deposit[J]. QUATERNARY SCIENCE REVIEWS,2010,29(15-16):1911-1922.
APA Xiong, Shangfa,Ding, Zhongli,Zhu, Yuanjian,Zhou, Ru,&Lu, Haijian.(2010).A similar to 6 Ma chemical weathering history, the grain size dependence of chemical weathering intensity, and its implications for provenance change of the Chinese loess-red clay deposit.QUATERNARY SCIENCE REVIEWS,29(15-16),1911-1922.
MLA Xiong, Shangfa,et al."A similar to 6 Ma chemical weathering history, the grain size dependence of chemical weathering intensity, and its implications for provenance change of the Chinese loess-red clay deposit".QUATERNARY SCIENCE REVIEWS 29.15-16(2010):1911-1922.

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来源：地质与地球物理研究所

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