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Uraninite——an economic uranium mineral in metamorphic uranium deposit no.3075

Acta Geochimica 1984年第2期 172-186页

作者：曹淑德 Beijing Institute of uranium Geology

Uraninite from the metamorphic deposit investigated is divided into two groups on thebasis of its occurrence and physical and chemical *** of the first group occursas distorted crystals in the form of elongated cubes a{100};the second group occurs mainlyin the form of rhombo-dodecahedra d{100),all belonging to the GaF;type in the *** chemical formulae are 8UO;·UO;·PbO for the first group and 5UO;·UO;·PbO forthe *** dating yields 1,900 and 300 *** the formation time of uraninite inthis *** former value corresponds to the main mineralization period and the latterrepresents the reformation event. *** major economic uranium mineral in metamorphic uranium deposit no.3075is a typical *** account of the low content of Th,it is also called“Th-free’ uranini-te of pure uranium *** is obviously different from the eguivalent with high contentsof Th and rare earths present as accessory minerals in granite and pegmatite elsewhere *** crystal form of uraninite No.1 is simple,whereas that of No.2 is *** UO;/UO;ratio for No.1 is larger than that of uraninite *** No 1 hashigh values for some physical parameters,such as reflectance,cell size,weight gain and har-dness as-compared with uraninite *** two types of uraninite are formed in different geological environments anddifferent in *** No.1 occurring in two-mica quartz-schist in the *** at the base of the Lower Proterozoiic Liaohe Group is of dynamo-thermal meta-morphic origin,as evidenced by:（1）The uraninite occurs as elongated platy crystals andis arranged in a direction paralled with *** is due to directional stress that the crystals have been elongated to become distorted cubic crystals during crystallization;（2）The ore-bearing rocks are generally similar in lithology to the barren rocks,without the in-troduction of extraneous *** is due to the fact that the formation

关键词： Th Uraninite an economic uranium mineral in metamorphic uranium deposit no.3075

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