四川省米易县海塔地区石英脉中巨粒晶质铀矿特征研究
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摘要
四川省米易县海塔地区石英脉中发现了十分罕见的巨粒晶质铀矿,含巨粒晶质铀矿石英脉呈透镜状产于元古宇五马箐组黑云斜长角闪片岩中。晶质铀矿多呈等轴粒状,粒径最大可达1 cm左右,在石英脉中成堆出现,主要与含氟榍石、氟磷灰石、钠长石、磷钇矿、辉钼矿等共生。电子探针分析结果显示,晶质铀矿中还含有一定量的Th、Pb等元素。通过人工合成实验及晶质铀矿形成的环境分析,晶质铀矿形成于高温条件下,远超热液范围(TC=374℃,PC=22.4 MPa)。巨粒晶质铀矿是富含U~(4+)、Th~(4+)、Y~(3+)、Ti~(4+)、P~(5+)、Na~+、Cl~-、F~-等组分的超临界流体运移至相对密闭的空间,因温压条件改变促使铀络合物发生分解,在长期缓慢的过程中所形成。巨粒晶质铀矿是区域铀矿化作用的一种特殊表现形式,也是深部存在大规模铀矿化的重要标志。
A rare gaint grain uraninite was discovered in quartz-vein in Haita area of Miyi country,Sichuan. The quartz-vein with gaint grain uraninite exhibits in lenticular and occurs in biotite plagioclase amphibole schist of Wumaqing Formation, Proterozoic. The gaint grain uraninite mostly exhibits in the shape of isometric texture with a maximum size of about 1 cm and piles up in quartz-vein. Mineral assemblage of uraninite includes mainly sphene containing fluorine, fluorapatite,albite, xenotime and molybdenite and so on. Electron microprobe analysis of uraninite showed uraninite also contains a certain amount of Th, Pb and other elements. The synthetic experiment and the environmental analysis on the formation of the uraninite showed that the uraninite can be formed inthe condition of high temperature which is far beyond the hot liquid range(TC=374℃, PC=22.4 MPa).The gaint grain uraninite maybe formed in long process of decomposition of complex in supercritical fluid rich in U~(4+), Th~(4+), Y~(3+), Ti~(4+), P~(5+), Na~+, Cl~-, F~- which migrated to a relatively confined space and experienced the change of the temperature and pressure which is a long and slow process.Gaint grain uraninite is a special form of regional uranium mineralization, and it is also the important indicator of the larger uranium mineralization in the deep.
A rare gaint grain uraninite was discovered in quartz-vein in Haita area of Miyi country,Sichuan. The quartz-vein with gaint grain uraninite exhibits in lenticular and occurs in biotite plagioclase amphibole schist of Wumaqing Formation, Proterozoic. The gaint grain uraninite mostly exhibits in the shape of isometric texture with a maximum size of about 1 cm and piles up in quartz-vein. Mineral assemblage of uraninite includes mainly sphene containing fluorine, fluorapatite,albite, xenotime and molybdenite and so on. Electron microprobe analysis of uraninite showed uraninite also contains a certain amount of Th, Pb and other elements. The synthetic experiment and the environmental analysis on the formation of the uraninite showed that the uraninite can be formed inthe condition of high temperature which is far beyond the hot liquid range(TC=374℃, PC=22.4 MPa).The gaint grain uraninite maybe formed in long process of decomposition of complex in supercritical fluid rich in U~(4+), Th~(4+), Y~(3+), Ti~(4+), P~(5+), Na~+, Cl~-, F~- which migrated to a relatively confined space and experienced the change of the temperature and pressure which is a long and slow process.Gaint grain uraninite is a special form of regional uranium mineralization, and it is also the important indicator of the larger uranium mineralization in the deep.
引文
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[15]陈佑纬,毕献武,胡瑞忠,等.贵东岩体黑云母成分特征及其对铀成矿的制约[J].矿物岩石地球化学通报,2010,29(4):355-363.
[16]陈佑纬,毕献武,胡瑞忠,等.陕南光石沟伟晶岩型铀矿床黑云母矿物化学研究及其对铀成矿的启示[J].矿物岩石,2013,33(4):17-28.
[17]王蝶,毕献武,周汀,等.金沙金-红河富碱侵入岩磷灰石挥发分组成那个特征及其地质意义[J].矿物学报,2013,33(2):231-238.
[18]王凤岗,范洪海,范存琨.马达加斯加南部Tranomaro地区矽卡岩型钍矿钍的赋存状态及钍矿物特征研究[J].世界核地质科学,2010,27(4):210-213.
[2]刘训,游国庆.中国的板块构造区划[J].中国地质,2015,42(1):1-17.
[3]莫帮洪,赵剑波,刘秀林,等.康滇地轴中段横山岩体的铀矿化类型与找矿方向[J].地质与勘探,2013,49(6):1 070-1 077.
[4]赵凤民,陈璋如,张静宜,等.铀矿物鉴定手册[M].北京:地质出版社,1988:60-65.
[5]王德荫,傅永全.铀矿物学[M].北京:原子能出版社,1981:90-94.
[6]沈才卿,赵凤民.八面体晶质铀矿的人工合成实验研究[J].铀矿地质,2014,30(4):252-256.
[7]刘凯鹏,李友良,张成江,等.四川米易海塔地区富晶质铀矿石英脉成矿物理化学条件研究[J].矿物学报,2015,(S1):599-600.
[8]杜乐天.全球热液铀矿地球化学-对当代国际热液铀矿理论的重建[M].北京:地质出版社,2015:89.
[9]谢鸿森,苏根利.超临界流体与成矿作用.资源环境与可持续发展[M].北京:科学出版社,1999:348-353.
[10]温志坚,毛景文.超临界流体的研究进展及其对成矿地球化学研究的启示[J].地质论评,2002,48(1):106-112.
[11]刘正义,刘红旭.花岗岩铀成矿作用的模拟实验[J].地学前缘,2009,16(1):99-113.
[12]李子颖,黄志章,李秀珍,等.南岭桂东岩浆岩与铀成矿作用[M].北京:地质出版社,2010:256-258.
[13]李子颖,黄志章,李秀珍,等.相山火成岩与铀成矿作用[M].北京:地质出版社,2014:264-271.
[14]刘英俊,曹励明,李兆麟,等.元素地球化学[M].北京:科学出版社,1984:222.
[15]陈佑纬,毕献武,胡瑞忠,等.贵东岩体黑云母成分特征及其对铀成矿的制约[J].矿物岩石地球化学通报,2010,29(4):355-363.
[16]陈佑纬,毕献武,胡瑞忠,等.陕南光石沟伟晶岩型铀矿床黑云母矿物化学研究及其对铀成矿的启示[J].矿物岩石,2013,33(4):17-28.
[17]王蝶,毕献武,周汀,等.金沙金-红河富碱侵入岩磷灰石挥发分组成那个特征及其地质意义[J].矿物学报,2013,33(2):231-238.
[18]王凤岗,范洪海,范存琨.马达加斯加南部Tranomaro地区矽卡岩型钍矿钍的赋存状态及钍矿物特征研究[J].世界核地质科学,2010,27(4):210-213.