Characteristics of fluid inclusions and fluid coupling mineralization of the Pengyang uranium deposit, Ordos Basin

•The ore-forming fluid is a mixed fluid of meteoric water and hydrocarbon fluid.•Although hydrocarbon fluid can bring some uranium, the uranium from the provenance area of the basin may be the main source.•Mineralization is caused by the coupling of uranium-containing oxygen-rich fluid infiltrated from the surface and deep hydrocarbon fluid.