Located in the middle and southern part of the Kangdian axis,Bajiaojing area in Huili,Sichuan Province is a rare Proterozoic uranium mining area in China.However,the relevant study is insufficient due to its complex structural conditions,and hardly any research has been reported on albite,an important uranium bearing rock in this area,which seriously restricts further uranium exploration.On the basis of previous studies,through the field geological survey of 1841 uranium mineralization points in Bajiaojing area,the geochemical analysis of rock elements of albite and the test analysis of zircon U-Pb chronology,it is found that albite in the study area is divided into magmatic albite and metasomatic albite.The samples are enriched in Th,U,Zr and REE,and relatively depleted in Ba,K,Sr and Rb.The dating results show that the two main peak ages are～2.3 Ga and～1.8 Ga.The albite is mainly derived from the partial melting of metamorphic mudstone in the lower crust and the addition of mantle derived materials,which was formed in the tectonic environment of intracontinental rift.The formation of its protolith is related to the collision event in the southwest margin of the Yangtze platform during 2.4-2.3 Ga,and underwent magmatism at about 1.8 Ga to form albite,and U element is enriched here.The two magmatic activities recorded by its chronological data are the response of the convergence of Columbia supercontinent in the southwest margin of the Yangtze block.
Southwest margin of Yangtze blockColumbia supercontinentalbitegeochemistryzircon U-Pb datingpetrology
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