云南大红山矿区梳状断裂构造系及其控矿作用

The comb fracture system in Dahongshan area,Yunnan province and its ore-controlling role

大红山铜(铁)矿床的形成与分布受控于康滇地轴早元古代裂陷海槽背景下发育的梳状断裂构造系;梳状断裂构造系通过控制沉积盆地、曼岗河组沉积作用、火山活动等间接控制了铜(铁)矿空间展布和定位。大红山矿区外围找矿首先应沿着同沉积断裂寻找古海底洼地。在康滇地轴基底大红山群及同时代含矿火山-沉积建造普遍被中生界覆盖的情况下,同沉积断裂相对于其他标志可能更易于识别,因而可作为区内勘查大红山式铜(铁)矿的重要准则。

This article puts forward that formation and distribution of Dahongshan copper （iron） deposit is controlled by the comb fracture system which was developed under Early Proterozoic aulogen background in Kangdian geo-axis. The fracture system directly controls sedimentary basin, sedimentation of Manganghe formation and the volcanism so as to indirectly control the location and spatial distribution of the copper （iron） deposit. The further prospecting in surroundings of Dahongshan copper （iron） deposit should directed to paleo-ocean depressions along the syn-depositional fault. Under the circumstance of general Mesozoic cover above the basement of Kangdian geotaxis, i.e. Dahongshan group and the contemporary ore-bearing volcanic-sedimentary formations the syn-depositional fault can be distinguished more easily thus is regarded as the important indicator for prospecting other Dahongshan style copper （iron） deposit.