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| The Geochemical Characteristics and Accessory Minerals of Biotite From U Deposit Bearing and U Deposit Barren Granite in Douzhashan Area |
| LI Jie，ZOU Mingliang，LIU Zijie，ZHANG Tao，ZHANG Jian |
| Research Institute No. 230，CNNC，Changsha，Hunan 410011，China |
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Abstract Located in the middle part of Miaoershan，Douzhashan pluton and Xiangcaoping pluton are similar in diagenetic times and near in spatial，but they are respectively the represent of U-deposit bearing and barren pluton. The fresh granites of Douzhashan and Xiangcaoping pluton were selected for the study of biotites. Based on the comprehensive analysis of electron microprobe data of biotite and the types of the accessory mineral the in Zhuguang，Guidong uranium orefield，It was found that the biotite in the U-deposit bearing granite was mainly composed of siderophyllite，while the biotites of the u-deposit barren granite was Fe-biotites in the diagram of （Fe2++Mn）-（ⅥAl+Fe3++Ti）-Mg. The former was relatively rich in aluminum，iron，manganese，low in magnesium，titanium. The SEM back scattering spectrum of Douzhashan granite and Xiangchaoping granite showed that the accessory mineral was obvious different. The former is a combination of zircon，xenotime，monazite，ilmenite，rutile，thorite，uraninite，and the latter is zircon，apatite，allanite，monazite，which is characterized by the lack of thorite and uraninite. In addition，different subspecies are different in diagenetic and metallogenic environment and there is a direct correspondence to the different types of mineralization. Therefore，the occurrence of siderophyllite can be used as an indirect discriminant mark for the uranium metallogenic potential of the U-deposit bearing and U-deposit barren granites.
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Received: 01 July 2019
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| [1] |
QU Kai 1,YIN Qingqing 1,2,LIU Xing 1,SIMA Xianzhang 1,WEN Guodong 3,ZHANG Panpan 3,YAN Guoqiang 1,ZHANG Chao 1. Mineral Chemistry Feature and its Geological Significance of Biotite From Liushuwan Granitic Pegmatite Type Uranium Deposit in North Qinling Orogen[J]. URANIUM GEOLOGY, 2019, 35(06): 330-342. |
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2021, Vol. 37 
