滇西龙川江盆地中南部砂岩型铀矿成矿特征及成因探讨

Discussion on the Genesis and Mineralization of sandstone Type Uranium Deposit in the Southern-Central Longchuanjiang Basin, Westem Yunlan province

研究了龙川江盆地中南部的沉积特征、构造特征及含矿岩系特征 ,提出铀成矿与构造演化中的 2个沉积间断面关系密切。通过对龙川江盆地中南部铀矿化特征的研究 ,在 3 82矿床内发现了沥青铀矿、铀黑和磷钙铀矿 ,在 3 81矿床发现了超显微状放射性矿物 ,并根据龙川江盆地中南部 3 82矿床成矿年龄的研究 ,提出了龙川江盆地中南部铀矿化的多阶段成因。

The paper mainly discusses the character istics of the depositional systems, geological structures and ore-bearing series in the south-cental Longchuanjiang basin, and points out that the uranium mineralization is closely related to the two depositional discontinuities caused by the tectonic evolution. Based on the characteristics of uranium mineralization in the area, piochblende, uranium blacks and phosphuranylite are discovened in No.382 uranium deposit and radiometric super-microminerals in No.381 deposit. The research on the uranium mineralization age in No.382 deposit shows that the mineralization in the south-central part of the basin has genetically multi-staged.