| Carbon and Oxygen Isotopic Characteristics of REE—Fluorocarbonate Minerals and Their Genetic Implications,Bayan Obo Deposit,Inner Mongloia,China |
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| 引用本文： | 方涛,裘愉卓,等.Carbon and Oxygen Isotopic Characteristics of REE—Fluorocarbonate Minerals and Their Genetic Implications,Bayan Obo Deposit,Inner Mongloia,China[J].中国地球化学学报,1996,15(1):82-86. |
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| 作者姓名： | 方涛 裘愉卓 |
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| 作者单位： | [1]InstituteofGeochemistry,ChineseAcademyofSciences,Guiyang,550002 [2]InstituteofGeochemistry,ChineseAcadem |
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| 摘 要： | REE－fluorocarbonates as major REE minerals in the Bayan Obo deposit,the largest REE deposit in the world,were analyzed for their stable isotopic compositions,The δ^13 C and δ^18 O values of huanghoite,cebaite and bastnaesite from late-stage veins vary in the ranges of 7.8--4.0‰ and 6.7-9.4‰,respectively,These data are relatively similar to those of bastnaesites from banded ores:δ^13C-5.6--5.2‰ andδ^18O3.6-5.5‰.The REE fluorocarbonates from both late-staege veins and banded ores are characterized by lower δ^13 C and δ^18O values,especially the δ^18O values of bastnaesites from banded ores.Compared with them,the disseminated bastnaesits the dolomite-type ores possess rather highδ^13 C and δ^18O values,i.e.,-2.1-0.4‰ and 8.6-12.9‰ respectively.The high values are typical of the sedimentary host dolomite rocks as well as of the dolomite-type-ores.The carbon and oxygen isotopic characteristics of REE fluorocarbonate minerals provide new evidence for the hypothesis on the origin of Bayan Obo deposit-epigenetic hydrothermal metasomatism.
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| 关 键 词： | 碳同位素 氧同位素 稀土元素 稀土矿床 铁矿床 中国内蒙古 钕矿床 |
Carbon and oxygen isotopic characteristics of REE-fluorocarbonate minerals and their genetic implications,Bayan Obo deposit,Inner Mongolia,China |
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| Tao Fang,Yuzhuo Qiu,Xiuhua Qiu.Carbon and oxygen isotopic characteristics of REE-fluorocarbonate minerals and their genetic implications,Bayan Obo deposit,Inner Mongolia,China[J].Chinese Journal of Geochemistry,1996,15(1):82-86. |
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| Authors: | Tao Fang Yuzhuo Qiu Xiuhua Qiu |
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| Institution: | 1. Institute of Geochemistry, Chinese Academy of Sciences, 550002, Guiyang
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| Abstract: | REE-fluorocarbonates as major REE minerals in the Bayan Obo deposit, the largest REE deposit in the world, were analyzed for their stable isotopic compositions. The δ13C and δ18O values of huanghoite, cebaite and bastnaesite from late-stage veins vary in the ranges of —7.8– ?4.0‰ and 6.7–9.4‰ respectively. These data are relatively similar to those of bastnaesites from banded ores : δ13C ?5.6– ?5.2‰ and δ18O 3.6–5.5‰ The REE fluorocarbonates from both late-stage veins and banded ores are characterized by lower δ13C and δ18O values, especially the δ18O values of bastnaesites from banded ores. Compared with them, the disseminated bastnaesits the dolomite-type ores possess rather high δ13C and δ18O values, i. e., ?2.1–?0.4‰ and 8.6–12.9‰ respectively. The high values are typical of the sedimentary host dolomite rocks as well as of the dolomite-type ores. The carbon and oxygen isotopic characteristics of REE fluorocarbonate minerals provide new evidence for the hypothesis on the origin of Bayan Obo deposit—epigenetic hydrothermal metasomatism. |
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