摘要
该矿区位于天山—五阴山纬向构造带与新华夏张广才岭隆起带的交接部位。西邻开原幅的金凤岭、红透山东西向巨大复式背斜东延至此倾没,并被华夏式构造截断。东西向构造是该区的主要构造形迹,但燕山运动以后,受到新华夏系各种扭动构造的明显改造。矿区处于柳河地堑西北边缘太古代地层内,柳河地堑长80km,宽9—15km,由侏罗—白垩系陆相火山岩组成,与太古界呈不整合或断层接触。含矿岩石为燕山期酸性火山岩—次火山岩类,与铼罗—白垩纪火山岩是同源岩浆产物。岩体受北东向吉乐—龙头压扭性断裂控制,沿NE70°方向呈椭圆形分布,长约2000m,宽约600m,与太古界鞍山群呈侵入接触关系(见图)。
This mine is located in the west of the Liuhe graben and the deposit is in the Archaean strata.The ore-bearing bodies are controlled by the NE- trending Jile-Longtou fracture,belonging to acid volcanic-subvolcanic rocks. The lodes are quartz veins and cabonate veins and its distribution is contro- lled by the fissures.The ore is poor in sulphide,and natural gold is mainly in pyrite and quartz,sometimes,a little in sphalerite and calcite.The decrepitation temperture is 260—300℃ from quartz,belonging to interme- diate hydrothermal series.According to the determination of S isotope,it is plutonic on origin.According to determination of Pb isotope,it is 1200— 1400Ma in age.From the above-mentioned facts,we can know the ore-for- ming substances are derived from old basement.According to the geological features,the author holds that the Xiaoluwanzi gold deposit is a magma activation type deposit related to the Yanshanian volcanic activities.
出处
《吉林地质》
1989年第4期71-76,共6页
Jilin Geology
