Genesis of the carbonatite-syenite complex and REE deposit at Maoniuping,Sichuan Province, China: Evidence from Pb isotope geochemistry

	Genesis of the carbonatite-syenite complex and REE deposit at Maoniuping,Sichuan Province, China: Evidence from Pb isotope geochemistry
	CHENG XU; HUAN ZHANG; ZHILONG HUANG; CONGQIANG LIU; LIANG QI; WENBO LI; TAO GUAN
	2004
发表期刊	Geochemical Journal
卷号	38 期号:1 页码:67-76
摘要	The Maoniuping REE deposit is the second largest light rare earth elements deposit (1.45 million tons of REE2O3) in China, located in the Panxi rift, Sichuan Province. It is a vein-type deposit hosted within, and genetically related to the Himalayan alkalic carbonatite-syenite complex. The initial 206Pb/204Pb and 208Pb/204Pb ratios from the Maoniuping carbonatites are similar to syenites, which, however, show more radiogenic 207Pb/204Pb ratios. This could not only be attributed to contamination by crustal materials. The Pb-Pb isotope plots from carbonatites and syenites define a linear array between EM1 and EM2. It suggests their sources were located in a heterogeneous lithospheric mantle and produced by the mixture of EM1 with EM2. The initial 206Pb/204Pb and 208Pb/204Pb ratios from fluorites, galenas, pyrites and feldspar are similar to carbonatites and syenites, and different from granites. Their 207Pb/204Pb ratios also plot to between syenites and carbonatites. This suggests the REE ore-forming fluids were derived from carbonatite and syenite magmas. The Pb isotopic results are consistent with a model for REE deposition involving mixing of the F-rich, syenite-derived fluid with Ca-, CO2-bearing fluid evolved from carbonatite magma. The early fluorites have higher 207Pb/204Pb ratio than the later ones, which shows that the REE ore-forming fluids were not contaminated by country rocks fluids.
关键词	Genesis Carbonatite Syenite Pb Isotope Maoniuping Ree Deposit
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/352002/6797
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
推荐引用方式 GB/T 7714	CHENG XU,HUAN ZHANG,ZHILONG HUANG,et al. Genesis of the carbonatite-syenite complex and REE deposit at Maoniuping,Sichuan Province, China: Evidence from Pb isotope geochemistry[J]. Geochemical Journal,2004,38(1):67-76.
APA	CHENG XU.,HUAN ZHANG.,ZHILONG HUANG.,CONGQIANG LIU.,LIANG QI.,...&TAO GUAN.(2004).Genesis of the carbonatite-syenite complex and REE deposit at Maoniuping,Sichuan Province, China: Evidence from Pb isotope geochemistry.Geochemical Journal,38(1),67-76.
MLA	CHENG XU,et al."Genesis of the carbonatite-syenite complex and REE deposit at Maoniuping,Sichuan Province, China: Evidence from Pb isotope geochemistry".Geochemical Journal 38.1(2004):67-76.

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