华北地台地球物理场、深部构造和金矿床

本文通过分析华北地台上地球物理场的特点,探讨了与金矿赋存有关的重力梯度带、局部重力低及负磁异常区产生的地质原因,推断了河北北部深断裂构造格架、热液蚀变区及花岗岩类侵入体的分布.结合华北地台上两个矿区实例,说明地球物理场、深部构造和金矿床的关系,从而建立了金矿床成矿的地球物理- 地质模型.最后对河北金矿远景区进行了成矿预测.

GEOPHYSICAL FIELD, DEEP-SEATED STRUCTURES AND GOLD DEPOSITS IN NORTH CHINA PLATFORM

Based on analysing characteristics of the geophysical field of North China Platform, this paper deals tentatively with geological factors causing gravity gradient zones, localized gravity low and negative magnetic anomalies related to gold deposits, and deduces structural framework of deep-seated faults, hydro-thermal alteration areas as well as distribution of granitoid intrusives in northern Hebei. Taking two ore districts on North China Platform as examples, it illust rates the relationship of geophysical field and deep-seated structures to gold deposits, thus establishing a geophysical-geological model for gold metallization. Finally, ore prediction is given for gold prospects in Hebei Province.