Geological and geochemical characteristics in the paleo-weathering crust sedimentary type REE deposits, western Guizhou, China

	Geological and geochemical characteristics in the paleo-weathering crust sedimentary type REE deposits, western Guizhou, China
	Zhou Lingjie; Zhang Zhengwei; Li Yujiao; You Fuhua; Wu Chengquan; Zheng Chaofei
通讯作者	Zhang Zhengwei
	2013
发表期刊	Journal of Asian Earth Sciences
卷号	73 期号:5 页码:184-198
摘要	A supergene REE deposit closely interrelated with the weathering of the Emeishan basalt formation was produced in the Xuanwei formation, the overlying stratum of the late Permian Emeishan basalt formation in West Guizhou, China. The host strata consist primarily of offwhite kaolinite clay rock and/or grayish black carbonaceous shale. Mineralogical analyses reveal that kaolinites are the major minerals in REE ores with small amounts of smectite, illite, boehmite, hornblende, pyrophyllite, calcite, dolomite and/or iron-bearing minerals, with a certain proportion of feldspar, quartz crystal debris and noncrystal debris. Geochemical analyses reveal high enrichment of trace elements like Cu, Nb, Ta, Zr and Hf. The host strata feature considerable lithological variability, close interrelation of the REE grade with the lithology and uneven spatial distribution of the REE ores, which are mostly found in Lufang, Maojiaping and Zhangsigou profiles of Weining County and can be as thick as 20 m. Of the five stratigraphic profiles, 48% have their whole-rock Sigma REE higher than 1000 ppm. The REE in this framework consists primarily of ion adsorbed phases and REE-rich residual independent mineral phases. Comprehensive analyses suggest that the source may not only include the Emeishan basalt, but the intermediate acid volcanic rocks evolved from the Emeishan basalt in the later periods; the hydrothermal alteration subsequently imposed on the host strata might have boosted the mineralization of the rare earth. The preliminary genetic model should have been: the denudation product from the weathering of the parent rock was migrated to the sea-continental margin at the continent side carrying huge quantities of REE with it and was preserved by the quick marine transgression. The host strata consist primarily of kaolinite clay rock and/or carbonaceous shale, which are so far believed to be a sedimentary type REE deposit closely interrelated with weathering effect.
学科领域	矿床地球化学
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/352002/5033
专题	矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
通讯作者	Zhang Zhengwei
推荐引用方式 GB/T 7714	Zhou Lingjie,Zhang Zhengwei,Li Yujiao,et al. Geological and geochemical characteristics in the paleo-weathering crust sedimentary type REE deposits, western Guizhou, China[J]. Journal of Asian Earth Sciences,2013,73(5):184-198.
APA	Zhou Lingjie,Zhang Zhengwei,Li Yujiao,You Fuhua,Wu Chengquan,&Zheng Chaofei.(2013).Geological and geochemical characteristics in the paleo-weathering crust sedimentary type REE deposits, western Guizhou, China.Journal of Asian Earth Sciences,73(5),184-198.
MLA	Zhou Lingjie,et al."Geological and geochemical characteristics in the paleo-weathering crust sedimentary type REE deposits, western Guizhou, China".Journal of Asian Earth Sciences 73.5(2013):184-198.

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