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

doi:10.1016/j.catena.2013.07.005

	Release of iron from chlorite weathering and links to magnetic enhancement in Chinese loess deposits
	Peng, Shuzhen 1,2; Hao, Qingzhen 2; Oldfield, Frank 3; Guo, Zhengtang 2
刊名	CATENA
	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
DOI	10.1016/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
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000334481700005
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)
内容类型	期刊论文
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.