Climatic and tectonic controls on weathering in south China and Indochina Peninsula: Clay mineralogical and geochemical investigations from the Pearl, Red, and Mekong drainage basins

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	Climatic and tectonic controls on weathering in south China and Indochina Peninsula: Clay mineralogical and geochemical investigations from the Pearl, Red, and Mekong drainage basins
	Liu, ZF ; Colin, C ; Huang, W ; Le, KP ; Tong, SQ ; Chen, Z ; Trentesaux, A
刊名	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
	2007
卷号	8 页码:-
关键词	clay minerals major elements chemical weathering Pearl River Red River Mekong River geochemistry : alteration and weathering processes mineralogy and petrology : alteration and weathering processes geochemistry : major and trace element geochemistry
ISSN号	1525-2027
通讯作者	lzhifei@mail.tongji.edu.cn
中文摘要	[1] Results of clay mineralogy, major element geochemistry, and Sr and Nd isotopes in 93 argillaceous samples collected from drainage basins of the Pearl, Red, and Mekong rivers reveal different degrees of chemical weathering in Southeast Asia despite similar climate conditions across these regions. The kaolinite/illite ratio, illite chemistry index, and illite crystallinity can be used as indicators of chemical weathering intensity. These mineralogical proxies combined with the K2O/(Na2O + CaO) molar ratio, chemical index of alteration (CIA), and weathering trends observed from major element results indicate intensive silicate weathering in the Pearl River basin, moderate to intensive in the Mekong River basin, and moderate in the Red River basin. Although a significant modification of epsilon Nd(0) values in our riverine sediments during chemical weathering and transport is unlikely, Sr-87/Sr-86 ratios are controlled by various states of chemical weathering of high-Sr minerals such as plagioclase (rich in Na and Ca) with a linear decrease trend from the Pearl, Mekong, to Red river basins. Our results suggest that it is not the warm climate with heavy monsoon precipitation but tectonics playing the most significant role in controlling weathering and erosion processes in south China and Indochina Peninsula. Strong physical erosion caused by tectonic activities and river incision along the eastern margin of the Tibetan Plateau and along the Red River fault system is responsible for high contents of primary minerals in the lowlands of Red and Mekong river basins.
学科主题	Geochemistry & Geophysics
收录类别	SCI
原文出处	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000246493400001
公开日期	2011-07-03
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/5897]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 GB/T 7714	Liu, ZF,Colin, C,Huang, W,et al. Climatic and tectonic controls on weathering in south China and Indochina Peninsula: Clay mineralogical and geochemical investigations from the Pearl, Red, and Mekong drainage basins[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2007,8:-.
APA	Liu, ZF.,Colin, C.,Huang, W.,Le, KP.,Tong, SQ.,...&Trentesaux, A.(2007).Climatic and tectonic controls on weathering in south China and Indochina Peninsula: Clay mineralogical and geochemical investigations from the Pearl, Red, and Mekong drainage basins.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,8,-.
MLA	Liu, ZF,et al."Climatic and tectonic controls on weathering in south China and Indochina Peninsula: Clay mineralogical and geochemical investigations from the Pearl, Red, and Mekong drainage basins".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 8(2007):-.