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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 内蒙古查干德勒苏地区下白垩统巴音戈壁组沉积体系及其对可地浸砂岩型铀矿的制约