二连盆地伊和高勒地区赛汉组砂岩型铀成矿条件

Sandstone-type Uranium Metallogenic Conditions of Saihan Formation in Yihe Gaole Area,Erlian Basin0

为揭示二连盆地马尼特坳陷伊和高勒地区下白垩统赛汉组砂岩型铀成矿条件,文章通过系统研究伊和高勒地区的构造特征、地层特征、岩性特征、岩石地球化学特征、地层含铀性、沉积相特征、水文地质和放射性水化学特征、氧化特征等,并与巴彦乌拉地区进行对比,分析了砂岩型铀成矿条件。研究区外部铀源条件好,赛汉组含铀性低;具有完善的“补-径-排”体系,放射性水化学异常明显。沙那凹陷具有缓倾的构造斜坡,发育辫状河三角洲,砂体发育,主要为灰色砂岩与泥岩互层;阿北凹陷具有陡倾的构造斜坡,发育扇三角洲,砂体极为发育,岩性为灰色、杂色砾岩夹灰色泥岩;沙那凹陷铀成矿条件较阿北凹陷好,相比巴彦乌拉地区赛汉组铀成矿条件较差。

To reveal the sandstone type uranium metallogeinic conditions of Lower Cretaceous Saihan Formation in Yihe Gaole area of Manit Depression in Erlian Basin,the article systematically studied the structural characteristics,stratigraphic characteristics,lithological characteristics,rock geochemical characteristics,uranium content,sedimentary facies characteristics,hydrogeological and radioactive hydrochemical characteristics,oxidation characteristics,etc.,and compared them to that in Bayan Ula area.The uranium source conditions around the research area were found good,but the uranium content of Saihan Formation is low;The study are is with a full recharge-run off-discharge groundwater system,with obvious radioactive hydrochemical anomalies.The Shana sag has a gently dipping structural slope,developed braided river deltas,and sand bodies mainly consisting of interbedded gray sandstone and mudstone.Abei sag has steep structural slopes,developed fan deltas,and highly developed sand bodies of gray variegated conglomerate interbedded with gray mudstone.The uranium metallogenic conditions in Shana sag are better than those in Abei sag,but worse than those in Saihan Formation in Bayan Ula area.