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Release of iron from chlorite weathering and links to magnetic enhancement in Chinese loess deposits

文献类型：期刊论文

作者Peng, Shuzhen1,2; Hao, Qingzhen2; Oldfield, Frank3; Guo, Zhengtang2
刊名CATENA
出版日期2014-06-01
卷号117页码:43-49
关键词Chinese loess Chlorite weathering Magnetic susceptibility East Asian summer monsoon
ISSN号0341-8162
DOI10.1016/j.catena.2013.07.005
文献子类Article
英文摘要Chlorite weathering is potentially useful as an indicator of in situ weathering related to the strength of the East Asian summer monsoon in Chinese loess deposits. The chlorite ratio (the integral area ratio of chlorite diffraction peaks at 0.47 nm and 0.7 nm) is a new proxy for evaluating the release of free iron from chlorite weathering. This ratio was measured using X-ray diffraction (XRD) on the < 2 mu m fraction of samples from four loess sections spanning the last 130 ka across the eastern Chinese Loess Plateau. The variations in the chlorite ratio in the four loess sections indicate that the release of free iron from chlorite weathering had taken place in all four last Interglacial Si soils and also, with the exception of the northernmost Huanxian section, in the middle Holocene SO soils. In contrast, the illite/chlorite (I/C) ratio measurements point to a reduction in chlorite content only in the southernmost Weinan section. This comparison suggests that chlorite weathering was initially characterized by Fe2+ leaching rather than by conversion of chlorite to another mineral phase during the incipient weathering stage. The southward increase in the chlorite ratio along the four sections is entirely consistent with the weathering gradient resulting from the present-day summer monsoon climate pattern. Thus, the chlorite ratio provides a more quantitative and sensitive tool for evaluating chlorite weathering. The results also suggest that chlorite weathering may be responsible for supplying free Fe for the formation of fine-grained secondary ferrimagnets in most, if not all, of the eastern Loess Plateau region. (C) 2013 Elsevier B.V. All rights reserved.
WOS关键词GLACIAL-INTERGLACIAL CYCLES ; LAST 130,000 YEARS ; MONSOON VARIATIONS ; NORTH CHINA ; PLATEAU ; SEQUENCE ; LUOCHUAN ; CLAY ; SUSCEPTIBILITY ; GEOCHEMISTRY
WOS研究方向Geology ; Agriculture ; Water Resources
语种英语
WOS记录号WOS:000334481700005
出版者ELSEVIER SCIENCE BV
资助机构National Basic Research Program of China (973 Program)(2010CB950204) ; National Basic Research Program of China (973 Program)(2010CB950204) ; National Natural Science Foundation of China(41072260 ; National Natural Science Foundation of China(41072260 ; Natural Science Foundation of Shandong(ZR2011DM012) ; Natural Science Foundation of Shandong(ZR2011DM012) ; 41172323) ; 41172323) ; National Basic Research Program of China (973 Program)(2010CB950204) ; National Basic Research Program of China (973 Program)(2010CB950204) ; National Natural Science Foundation of China(41072260 ; National Natural Science Foundation of China(41072260 ; Natural Science Foundation of Shandong(ZR2011DM012) ; Natural Science Foundation of Shandong(ZR2011DM012) ; 41172323) ; 41172323) ; National Basic Research Program of China (973 Program)(2010CB950204) ; National Basic Research Program of China (973 Program)(2010CB950204) ; National Natural Science Foundation of China(41072260 ; National Natural Science Foundation of China(41072260 ; Natural Science Foundation of Shandong(ZR2011DM012) ; Natural Science Foundation of Shandong(ZR2011DM012) ; 41172323) ; 41172323) ; National Basic Research Program of China (973 Program)(2010CB950204) ; National Basic Research Program of China (973 Program)(2010CB950204) ; National Natural Science Foundation of China(41072260 ; National Natural Science Foundation of China(41072260 ; Natural Science Foundation of Shandong(ZR2011DM012) ; Natural Science Foundation of Shandong(ZR2011DM012) ; 41172323) ; 41172323)
源URL[http://ir.iggcas.ac.cn/handle/132A11/85272]  
专题中国科学院地质与地球物理研究所
通讯作者Peng, Shuzhen
作者单位1.Taishan Univ, Key Lab Tourism & Resources Environm Univ Shandon, Tai An 271021, Shandong, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
3.Univ Liverpool, Sch Environm Sci, Liverpool L69 7ZT, Merseyside, England
推荐引用方式
GB/T 7714		 Peng, Shuzhen,Hao, Qingzhen,Oldfield, Frank,et al. Release of iron from chlorite weathering and links to magnetic enhancement in Chinese loess deposits[J]. CATENA,2014,117:43-49.
APA Peng, Shuzhen,Hao, Qingzhen,Oldfield, Frank,&Guo, Zhengtang.(2014).Release of iron from chlorite weathering and links to magnetic enhancement in Chinese loess deposits.CATENA,117,43-49.
MLA Peng, Shuzhen,et al."Release of iron from chlorite weathering and links to magnetic enhancement in Chinese loess deposits".CATENA 117(2014):43-49.

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来源：地质与地球物理研究所

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