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 | |
刊名 | Geochemical Journal
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2004 | |
卷号 | 38页码:67-76 |
关键词 | Genesis Carbonatite, Syenite Pb Isotope Maoniuping Ree Deposit |
英文摘要 | 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. |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.gyig.ac.cn/handle/42920512-1/8127] ![]() |
专题 | 地球化学研究所_矿床地球化学国家重点实验室 |
作者单位 | 1.Graduate School, Chinese Academy of Sciences, Beijing 100039, China 2.Open Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
推荐引用方式 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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