陕甘宁盆地层间氧化带砂岩型铀矿成矿远景研究

与已知产有层间氧化带砂岩型铀矿化的“造山带型”盆地相比，“陆台型”的陕甘宁盆地无论是在盆地产出的地球动力学背景、成盆后水文地质的演化，还是在成矿作用的动力——造山作用的表现形式上都有明显的差异，因而中亚地区层间氧化带型铀矿的区域预测准则可能并不完全适用。本文从陕甘宁盆地独特的区域地质条件出发，详细研究了盆地中新生代盖层的水文地质条件，划分了水文地质旋回，据此阐明了盆内层间氧化带砂岩型铀矿的产出前景，指出该类铀矿化的找矿靶区，并进一步预测了成矿的深度。

STUDY ON METALLOGENETIC PROSPECT OFINTERLAYER OXIDATION ZONE SANDSTONETYPE URANIUM DEPOSIT IN SHANGANNING BASIN

As Compared with orogenic zone basin, which the interlayer oxidation zone sandstonetype uranium deposits are found, the Shanganning basin a continental platform type basin isdistinct either in the geodynamic background and the post--basin hydrogeological evolution orin the appearance of the metallogenetic dynamics--orogenesls. The prediction crlterla summarized for interlayer oxidation zone type U--deposits in Middle Asia therefore can not be completely applied in such a basin. Based on analysis of the typical regional geological setting.the hydrogeology of the Meso--Cenozoic cover is studied in detail. Three hydrogeological cycles have been divided, and prospects of uranium deposits have been clarified and the mostpromising target have been proposed.