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