个旧矿集区东区重力场特征及地质-地球物理找矿模型

Characteristics of gravity field and establishment of geological and geophysical prospecting model in east Gejiu ore concentration area

利用1∶5万重力测量数据,分析云南省个旧矿集区东区重力(剩余)异常特征;基于剩余重力异常,综合分析多尺度断裂体系的构造特征,确定了11条断裂,其中EW向4条断裂为主要控岩控矿断裂;圈定了隐伏岩体突起范围。依据物性(密度)测定结果,结合2条剖面成果推断矿区深部岩体和矿体分布形态;并圈定隐伏矿体13处,其中6处为已知矿体,其余7处找矿前景良好。总结了花岗岩体和断裂与重力异常特征的对应关系,根据花岗岩体、断裂构造与矿体之间的关系,建立了地质-地球物理找矿模型。

Gejiu tin-copper polymetallic ore concentration area is located in Yunnan Province, and is currently the largest tin-polymetallic ore concentration area in China. In this paper, 1∶50000 gravimetric data are used to study the gravity(residual) anomaly characteristics in the eastern Gejiu ore concentration area. Based on the residual gravity anomaly, the structural characteristics of the multi-scale fault system are comprehensively analyzed, and 11 faults are identified, among which 4 faults in the EW direction are determined as main rock and ore controlling faults, and the bulge range of hidden rock mass is also defined. According to the results of physical property(density) measurement and combined with the results of two sections, the distribution form of deep rock mass and ore body in the mining area is inferred. Thirteen hidden ore bodies are delineated, of which 6 are previously known ore bodies and the other 7 have good prospecting prospects. The corresponding relationship between granitic body, fault and gravity anomaly is comprehensively summarized, and a geological-geophysical prospecting model is established in reference to the relationship.