准噶尔盆地北部顶山地区乌伦古河组W-1旋回岩石-地球化学特征

顶山地区是1992—1994年在准噶尔盆地开展的小比例(1：100万-1：50万)砂岩型铀矿区域预测工作中，划分出的一级远景区，并于1998—2002年进行的1：25万～1：20万带钻铀矿区域预测评价工作进一步落实的砂岩型铀成矿远景区，在主要目的层乌伦古河组的W-1旋回中已发现3个工业铀矿化孔．通过对研究区的地质构造特征W-1旋回岩石-地球化学特征等分析研究，认为该旋回为一套厚大的砾质辫状平原相砾岩、砂砾岩、(含砾)粗砂岩组合，夹薄层泥岩、粉砂岩，根据岩石结构、构造等特征，划分出3种岩石类型．同时乌伦古河组W-1旋回原生灰色岩石分布较为局限，大致呈EW向带状展布，并向东部延伸至杜热一带．东部杜热地区是值得进一步工作的远景区．

CHARACTERISTIC OF ROCK GEOCHEMISTRY FOR W-1 CYCLE OF WULUNGUHE FORMATION AT DINGSHAN AREA IN NORTH JUNGAR BASIN

Dingshan area is the first class propecting area that was affirmed while small scale (1:1000000-1:500000) regional propecting for sandstone uranium deposit. From 1998 to 2002, 1:250000-1:200000 regional ore prospecting with drilling was made in this area. Three industrial mineralized drill was found in W-1 cycle of Wulunguhe formation. According to the study on characteristics of geologic structure, rock grochemistry of W-1 cycle, we conclude that W-1 cycle belongs to a suit of thick, gravelly, braided plain conglomerate, glutenite, (pebbled) gritstone and with laminar mudstone and aleurolite interlining. Three rock types was distinguished based on rock texture and petrotectonic. The distribution of W-1 cycle primary gray rock trending in EW direction was localized and its east end extends to Dure which area is one of the promising propective area..