柴东盆地重磁场特征及构造单元划分

Characteristic of gravitational-magnetic field and division of tectonic unites in Chaidamu Basin

本文通过对柴东盆地各地质体 (层 )物性参数和重磁场特征分析 ,推断解释盆地的基底结构、岩相特征、磁源体埋深、断裂构造性质及其控盆作用和对沉积盖层凹凸格局的影响 ,对柴东盆地的基底及盖层构造单元进行了划分。笔者建议在相对稳定的地区 ,寻找基底埋藏浅、沉积盖层厚度较薄 ,有利于铀成矿的斜坡带。

Through the analysis on the geophysical parameters and gravitational magnetic characteristics of different geologic bodies in the eastern Chaidamu basin, the basement structure of the basin, features of lithofacies, depth of magnetic bodies, the property of fault and its controlling role on the basin formation, the influence of uplift subsidence pattern of sedimentary cover are inferred and interpreted, the division of tectonic units of the basement and the sedimentary cover of the basin is made in this paper. The author suggests to look for the slope zone which is favourable for uranium ore formation. The slope zone is an area where tectonic activity is relatively stable, the basement is shallowly buried, and the sedimentary cover is relatively thin.