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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
Source PublicationGeochemical Journal
Volume38Pages:67-76
Abstract

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.

KeywordGenesis Carbonatite, Syenite Pb Isotope Maoniuping Ree Deposit
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8127
Collection矿床地球化学国家重点实验室
Affiliation1.Open Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.Graduate School, Chinese Academy of Sciences, Beijing 100039, China
Recommended Citation
GB/T 7714
CHENG XU;HUAN ZHANG;ZHILONG HUANG;CONGQIANG LIU;LIANG QI;WENBO LI;TAO GUAN. Genesis of the carbonatite-syenite complex and REE deposit at Maoniuping, Sichuan Province, China: Evidence from Pb isotope geochemistry[J]. Geochemical Journal,2004,38:67-76.
APA CHENG XU;HUAN ZHANG;ZHILONG HUANG;CONGQIANG LIU;LIANG QI;WENBO LI;TAO GUAN.(2004).Genesis of the carbonatite-syenite complex and REE deposit at Maoniuping, Sichuan Province, China: Evidence from Pb isotope geochemistry.Geochemical Journal,38,67-76.
MLA CHENG XU;HUAN ZHANG;ZHILONG HUANG;CONGQIANG LIU;LIANG QI;WENBO LI;TAO GUAN."Genesis of the carbonatite-syenite complex and REE deposit at Maoniuping, Sichuan Province, China: Evidence from Pb isotope geochemistry".Geochemical Journal 38(2004):67-76.
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