湘南—桂北及邻区的地球物理场特征,深部构造和铀矿床

本文讨论了湘南-桂北及邻区的地球物理场特征、深部构造及其与铀矿床的关系。研究结果主要表明了以下几点: (1)铀矿化分布在重力场反映的深断裂上,尤其在断裂构造的交汇处。 (2)铀矿化位于莫(?)面的变化带上,并在变化带的转弯部位。 (3)铀矿化与大规模的岩浆活动有关,产铀岩体厚度大,铀源来自深部花岗岩浆。 (4)所有铀矿化区与低磁区有关,产出在低磁区的边缘,这种低磁区是由于热液作用所致。花岗岩型铀矿床的形成主要是非岩浆水的热液作用,隐伏断裂为地层中的热液水运移到岩体中提供了通道,地球物理场指示了这些隐伏断裂的存在。

GEOPHYSICAL FIELD FEATURES, DEEP STRUCTURES AND URANIUM DEPOSITS IN SOUTHERN HUNAN AND NORTHERN GUANGXI AND ITS SURROUNDING AREAS

This paper discusses the geophysical features, deep structures and their relationship with uranium deposit The study results are as follows: 1. Uranium mineralization is distributed on the deep fracture shown by gravity field, particularly, on the intersection of fracture structures. 2. Uranium mineralization occurs on the bends of variation belts of Moho. 3. Uranium mineralization is associated with large scale magmatism. Uranium producing massif is thick and uranium comes from deep sranite magma. 4. All uranium mineralization is associated with low magnetic areas and occurs on the margins of low magnetic areas formed by hydrothermal process Granite-type uranium deposit is mainly formed under hydrothermal process of non-magmatic solution. Blind fractures provide channels for hydrothermal solution in the strata to migrate into granite massif. Geophysical field indicates the existence of these blind fractures.