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桂北地区的重磁场与铀矿化有着密切的联系,地球物理场的特征反映了与铀成矿有关的地质环境。研究表明,桂北地区的铀矿化主要有如下一些明显的特点;(l)铀矿化位于不同规模的地球物理场或异常的边缘,尤其是大规模的铀矿化产在区域重力低异常(对应于地壳增厚区即地幔拗陷区)的边缘;(2)深部地质作用如莫霍面的起伏、深部大规模的岩浆活动和深断裂作用是铀成矿的重要控制因素;(3)花岗岩体不仅是花岗岩型铀矿化,而且也是碳硅泥岩型铀矿化的铀源体,且岩浆的动力场愈强烈,岩体的铀含量愈高,对铀成矿愈有利;(4)与铀成矿有关的热液流体为非岩浆成因,具有很强的去碰能力,花岗岩为热液循环提供动力;(5)与铀矿化密切共生的黄铁矿主要源于岩体的“磁性壳”;(6)铀矿床形成于中-低温、浅地表的地质环境。
The heavy and magnetic field in North Guangxi is closely related to uranium mineralization. The characteristics of geophysical field reflect the geological environment related to uranium mineralization. The study shows that uranium mineralization in the northern part of the country has some obvious features as follows: (1) Uranium mineralization is located at different scales of geophysical fields or anomalous edges, especially large-scale uranium mineralization. In regional low-gravity anomalies (Corresponding to the crust thickening area that is the mantle depression) edge; (2) deep geological processes such as the Moho fluctuation, deep large-scale magmatic activity and deep faulting are important controlling factors for uranium mineralization; (3) ) Granite is not only granitic uranium mineralization but also uranium source of carbon-silicon mudstone-type uranium mineralization, and the more intense magma dynamic field, the higher the uranium content of rock mass is, ) Hydrothermal fluids related to uranium mineralization are of non-magmatic origin and have a strong ability to strike off. Granites provide impetus for the hydrothermal cycle. (5) Pyrite closely intergrown with uranium mineralization is mainly derived from “Magnetic shell”; (6) Uranium deposits formed in the medium-low temperature, shallow surface geological environment.