陕西省丹凤地区花岗伟晶岩型铀矿特征及找矿方向
Characteristics and Prospecting Direction of Granitic Pegmatite-Type Uranium in Danfeng Area, Shaanxi Province
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摘要: 陕西省丹凤地区花岗伟晶岩型U矿呈脉状产于加里东期花岗岩株内外接触带的富U黑云母花岗伟晶岩脉中,矿石以中粗粒花岗结构、块状构造为主,副矿物组合为磷灰石-锆石,铀矿物主要是晶质铀矿。矿石矿物为富团块状黑云母、棕红色更长石,富Si、富K、铝过饱和, Eu亏损,轻稀土元素富集,富Mo、Zr、F元素特点。该类型铀矿是加里东期壳幔混源含U、含F、低氧逸度的岩浆-热液过渡性流体体系,在拉伸大陆动力学背景下随富U黑云母花岗伟晶岩成岩结晶分异形成。流体体系中U以F的铀酰络合物方式迁移,岩浆结晶分异成岩过程中U形成晶质铀矿物富集于黑云母花岗伟晶岩局部形成了铀矿(化)体, F形成团块状黑云母矿物。岩体东南部花岗岩株内外接触带300 m是铀矿体分布范围及找矿方向。
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关键词:
- 陕西省丹凤地区 /
- 花岗伟晶岩型铀矿特征 /
- 找矿方向
Abstract: Distributed in vein form, the granitic pegmatite-type uranium in Danfeng Area, Shaanxi Province originates from uranium-rich biotite granitic pegmatite dyke, in the inside and outside contact belts of granitic stock in Caledonian Period. The ore is basically consisted of coarse granitic block and the accessory ore assemblage is apatite-zircon. Containing mass biotite and brownish-red oligoclase, the uranium ore is mainly uraninite, with characteristics like Si-rich, K-rich, Al-oversaturated, Eu-loss, LREE-rich, Mo-rich, Zr-rich, F-rich etc. This kind of Uranium belongs to crust-mantle mixing, magmatic-hydrothermal transitional fluid system with Ur, F elements and low-oxygen fugacity. Under the background of tensile continental dynamics, the uranium deposit is formed along with the differentiation and crystallization of Ur-rich biotite granitic pegmatite. In the fluid system, Ur is transported in F uranyl complex. In diagenetic process of magmatic crystallization differentiation, Ur formed uraninite and enriched in biotite granitic pegmatite, part of it developed into Uranium deposit body, and F developed into mass biotite mineral. It is also concluded that 300 m inside and outside contact belt of granitic stock southeast to the rock mass is the distribution range and prospecting direction of Uranium ore body. -
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冯张生,张荣志,沙亚洲,等.陕西省商南县光石沟铀矿床外围铀矿普查报告[R].陕西省核工业地质局二二四大队,2011.
Feng Zhangsheng, Zhang Rongzhi, Sha Yazhou, et al. The light gully uranium deposits peripheral uranium census report in Shaanxi Province, Shangnan[R]. No.224 Geological Team,Shaanxi Nuclear Geology Bureau, 2011.
罗忠戌,沙亚洲,张展适,等.丹凤地区花岗伟晶岩型铀矿富集规律及成矿远景预测研究报告[R].中国核工业地质局,2008.
Luo Zhongxu, Sha Yazhou, Zhang Zhanshi, et al. The study on Uranium enriching regularity and metallogenic prognosis study of Danfeng granitic-pegmatite uranium Deposit[R]. China Nuclear Industry Geological Bureau, 2008.
王涛,胡能高,裴先治,等.秦岭杂岩的组成、构造格局及演化[J].地球学报,1997,18(4):345-351.
Wang tao, Hu Nenggao, Pei Xianzhi, et al. composition, tectonic framework and evolution of the Qinling complex[J].Earth Science, 1997,18(4):345-351.
张德会,张文淮,许国建,等.富F熔体-溶液体系流体地球化学及其成矿效应研究现状及存在问题[J].地学前缘(中国地质大学.北京)2004,11(2):479-489.
Zhang Dehui,Zhang Wenhuai, Xu Guojian, et al. Rich F melt a solution of system fluid geochemistry and mineralization effects of the present condition and existence problem[J].Earth Science Frontiers (China University of Geosciences, Beijing)2004,11(2):479-489.
冯张生,焦金荣,张夏涛,等.丹凤地区北部加里东期岩浆岩演化特征与铀矿化关系.世界核地质科学,2011,28(4):202-207.
Feng Zhangsheng, Jiao Jinrong, Zhang Xiatao, et al. The relationship on evolution characteristics and uranium mineralization of the Caledonian magmatic rocks in the northern of Danfeng[J].Nuclear Seience,2011, 28(4):202-207.
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