| Abstrakt: |
Sandstone-type uranium deposits (STUDs) are the most important global source of uranium. However, it is unclear why STUDs have a non-random distribution in time and space. It is generally thought that STUDs are formed by the circulation of groundwater in sandstone rocks. The groundwater is typically oxidized and sourced from local precipitation, which suggests the regional climate may have a role in the formation of STUDs. The groundwater circulation is mainly affected by basin evolution, which means that regional tectonism may also control the formation of STUDs. In this study, the author examined STUDs in Asia, and compiled previously reported ages for STUDs and compared these with the uplift history of the major ore-hosting regions and the late Mesozoic–Cenozoic climatic evolution of Asia. Apart from a few uranium deposits in the Transural region, most of the STUDs in Asia were formed during the Late Cretaceous to Quaternary, and can be classified into three stages: Late Cretaceous–early Paleogene (80–50 Ma; stage I), Oligocene–mid-Miocene (25–17 Ma; stage II), and late Miocene–present (8–0 Ma; stage III). The formation of STUDs in Asia was closely related to regional uplift caused by India–Eurasia collision, subduction of oceanic plates, and increased humidity during greenhouse climate periods and intensification of the Asian Monsoon. [ABSTRACT FROM AUTHOR] |
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