Abstract
AbstractThe intracontinental Ordos Basin hosts many large uranium deposits, and its evolution was controlled by the surrounding orogenic belts during the Paleozoic to Mesozoic. Paleocurrent data of the Jurassic Zhiluo Formation reveal that its sedimentary detritus were transported dominantly from southwest to northeast in the basin. However, the detrital zircon age pattern of the Zhiluo Formation is similar to those of the Inner Mongolia Paleo-uplift, the Central Asian Orogenic Belt (CAOB), the Yinshan Block, and the Khondalite Belt to the north but is remarkably different from those of the Qinling Orogenic Belt (QOB) and the North Qilian Belt to the south. Discriminant diagrams using immobile elements also reveal that the detritus of the Zhiluo Formation are dominated by felsic volcanic rocks and andesitic arc rocks, consistent with rock types in its northern orogenic units. The Zhiluo sandstones show high chemical index of weathering values (68–83), suggesting long-distance transportation and intensive ...
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