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Depositional system of the Bayangobi Formation,Lower Cretaceous and its control over in-situ leachable sandstone-type uranium deposits in Chagandelesu area,Inner Mongolia 內矇古查乾德勒囌地區下白堊統巴音戈壁組沉積躰系及其對可地浸砂巖型鈾鑛的制約