| 内蒙古敖包吐萤石矿床地质和地球化学特征 |
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| 关键词:monomineral-fluorite deposit heavy rare earth elements geological characteristics Nd isotope Siziwangqi Inner Mongolia |
| 基金项目:国家自然科学基金项目(编号:40573025);; 中央级公益性科研院所基本业务费项目(编号:K0814) |
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| Geological and Geochemical Characteritics of the Aobaotu Fluorite Deposit in Inner Mongolia |
| This paper has comprehensively summarized geological characteristics of the Aobaotu fluorite deposit and discussed its mineralization and material sources on the basis of studying rare earth elements and Nd isotopes.The Aobaotu fluorite deposit is a monomineral-fluorite deposit occurring at the contact zone between the volcanics-volcanogene sedimentary rocks of Lower Permian Dashizhai Formation and the Middle Yanshanian granitoid.REE contents of fluorite ores range from 8.04×10-6 to 30.04×10-6,19.42×10-6 on average,LREE/HREE ratios range from 0.24 to 0.65,0.52 on average,LaN/YbN ratios range from 0.07 to 0.62,0.26 on average,and δEu range from 0.42 to 0.90,0.6 on average.The REE pattern shows a HREE-enriched distribution with an obvious Eu negative anomaly.Nd isotope data show evolutionary characteristics of the palaeocontinental crust,with εNd(138 Ma)ranging from-7.30 to-30.55,suggesting that the crust is the main source of this deposit.It is held that the ore-forming fluid is a mixture of waters from different sources,as evidenced by the discrimination diagram of Tb/La-Tb/Ca that reflects the remobilization crystallization trend of fluorite.The marine volcanism in Permian formed the source bed through exhalative sedimentary mineralization,and the Middle Yanshanian granitoid supplied fluid and heat energy for the remobilization and concentration of the source bed.The ore-forming fluid precipitated in the structural fracture zone of the Dashizhai Formation and formed the Aobaotu fluorite deposit. |
| XU Dong-qing,NIE Feng-jun,JIANG Si-hong,ZHANG Wan-yi,YUN Fei,YANG Cai,ZHANG Tian-jun,LÜ Xu-guang,LIN Ri-liang.2008.Geological and Geochemical Characteritics of the Aobaotu Fluorite Deposit in Inner Mongolia[J].Acta Geoscientica Sinica,29(4):440-450. |
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