Material source analysis and element geochemical research about two types of representative bauxite deposits and terra rossa in western Guangxi, southern China

	Material source analysis and element geochemical research about two types of representative bauxite deposits and terra rossa in western Guangxi, southern China
	Wei Xiao; Ji Hongbing; Li Daojing; Zhang Fenglei; Wang Shijie
通讯作者	Ji Hongbing
	2013
发表期刊	Journal of Geochemical Exploration
卷号	133 期号:1 页码:68-87
摘要	In this study, geologic field observations and geochemical indicators of the types of representative bauxite deposits, terra rossa and underlying carbonate rocks in western Guangxi, southern China, were investigated. Their interrelations, material sources, formation and evolution processes were discussed. The results show an inherited relationship between terra rossa and its underlying limestone. The relevant parameter diagrams of trace and rare earth elements suggest that the two types of bauxite deposits probably possess identical material sources. Both bauxite deposits and terra rossa have close affinities with each other, implying that carbonate rocks similar to the underlying limestone might be a major material source for their formation. However, the eolian component represented by Chinese loess and igneous rock genesis with respect to Emeishan basalt plume may not contribute so much to the material source of bauxite deposits and terra rossa. In the process of leaching and pedogenesis, the mobile elements, such as Ca, Mg and Na, were preferentially dissolved and removed from parent rocks, and the less mobile elements Al, Fe, Ti and Si were accumulated and enriched. During the period of diagenesis and bauxitization, elements K and Si were largely removed from the system. Especially, in transformation from primary bauxite to secondary bauxite deposit, the contents of many “less mobile” elements, such as Fe and Ti, decreased. This finding is possibly due to the strongly acidic environment caused by decomposition of pyrite in primary sedimentation-type bauxite deposit. This study systematically analyzed the inherited relations and evolution processes among carbonate rock, terra rossa, and two types of bauxite deposits, and gave a guide for the bauxite deposit prospecting in western Guangxi.
关键词	Karst-type Bauxite Terra Rossa Material Source Geochemical Characteristic Guangxi China
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5013
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文环境地球化学国家重点实验室
通讯作者	Ji Hongbing
推荐引用方式 GB/T 7714	Wei Xiao,Ji Hongbing,Li Daojing,et al. Material source analysis and element geochemical research about two types of representative bauxite deposits and terra rossa in western Guangxi, southern China[J]. Journal of Geochemical Exploration,2013,133(1):68-87.
APA	Wei Xiao,Ji Hongbing,Li Daojing,Zhang Fenglei,&Wang Shijie.(2013).Material source analysis and element geochemical research about two types of representative bauxite deposits and terra rossa in western Guangxi, southern China.Journal of Geochemical Exploration,133(1),68-87.
MLA	Wei Xiao,et al."Material source analysis and element geochemical research about two types of representative bauxite deposits and terra rossa in western Guangxi, southern China".Journal of Geochemical Exploration 133.1(2013):68-87.

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