新疆伊犁盆地达拉地铀矿床多层性成矿机理

新疆伊犁盆地达拉地铀矿床产于构造活动强烈区具承压自流水特征的小型达拉地盆式向斜,属伊犁盆地南缘东部构造活动区南部向斜带的一部分．主含矿地层水西沟群(J1-2sh)以独特的“煤-砂-泥”结构为主,层间砂体较发育。具多层性成矿特点．工业铀矿化主要是煤岩型,其次是砂岩型．通过与其它矿床对比分析,认为构造活动区小构造中难以形成和保存大矿,而构造稳定的大范围单斜区具“泥-砂-泥”结构地层,易于形成和保存大型后生淋滤型砂岩铀矿．

THE MECHANISM OF MULTI-LAYER ORE-FORMING OF DALADI URANIUM DEPOSIT IN THE ILI BASIN, AND ITS INSPIRATION SIGNIFICANCE FOR URANIUM PROSPECTING

The Daladi uranium deposit is located at Daladi basin-like syncline of tectonically active region.Daladi basin-like syncline is a small-area artesian basin.The main ore-bearing strata, Shuixigou Group (J1-2sh),is of constitution of "coal and sandstone bodies and argillite" rock association, and interbeded sandstone bodies in it developed better than in the other region. So the Daladi uranium deposit is characteristed by multi-layer mineralization. Ingredient type is the dominated industrial uranium reserves and sandstone type is following. According to comparing the layer mineralization of Daladi uranium deposit to the other uranium deposit in Ili basin,author proposed that in the small-area tectonic form of tectonically active region,forming and reserving of large-scale uranium deposit is difficult. In the large-area tectonically stable region occurring monoclinal stratum.,the large-scale epigenetic mineralization of sandstone-type uranium deposit is easy to occur in the strata with constitution of "argillite and sandstone bodies .and argillite" association.