| 114铀矿床地质特征及成矿作用 |
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| 引用本文：.1983.Geologic Features And Mineralization Of The 114 Uranium Ore Deposit[J].Mineral Deposits,2(4):61~68 |
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| Geologic Features And Mineralization Of The 114 Uranium Ore Deposit |
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| Abstract:The uranium ore deposit in question, generally considered to be a mesoepithermal monomineralic U-deposit, is situated in the area where the Dadongshan-Guidong subzone of Nanling E-W tectonic zone, the west flank of northern Guangdong E-type structure, a N-S structure and the Neocathaysia:n tectonic systems overlap each other. Ore bodies mainly occur in carbonate rocks of the Carboniferous and Permian strata arid are controlled by the NW trending tensile fractures of the Neocathaysian. The mining area is surrounded by the Yenshanian granites; within this area there exist rhyolite-porphyry of unknown age and lamprophyre dikes, quartz-porphyry dikes and small bodies of late Yenshanian period. Uranium concentration is controlled by the late Neocathaysian structure mainly by the NW trending tensile fracture zone and its adjacent interformational fracture zone, along which lenticular ore bodies were formed. Of all minerals in ore. only uranium minerals are useful, and pitch blende is the principal one. Associated with it are calcite. hematite. pyrite, galena, marcasite and dickite of the first mineralization stage, ond calcite, pyrite and galena of the second minerlization stage. Calcitization, hematitization and pyritization took place during the uraniym hydrothermal mineralization process, the first one being relatively strong and widespread. In addition, there is also redization caused by radioactivity. It is believed that Uranium was provided by Yenshanian granites in that the granites surrounding the ore deposit contain much more uranium (0.0011-0.0019%) than Carboniferous, Permian and Triassic strata in the mining area (averaging 0.0019%). Homogenization temperatures of gaseous-liquid inclusions in the second mineralization stage calcite, presumably the ore-forming temperatures, range from 105-210℃. Pitchblende has been dated at 70 m.y., pertaining in time to late Yenshanian movement. |
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