中条山区裂谷型层状铜矿床

中条山铜矿集中区位于华北地台南缘。中太古代时地壳已克拉通化,因华南板块俯冲,相继产生北东及北西向深大断裂,形成三叉形裂谷。在晚太古代有“双峰态”火山活动、碱性岩浆喷发和侵入,反映了裂谷拉张特征。至中元古代,因挤压而产生钙碱性岩浆,有安山岩覆盖后,裂谷消亡。铜矿集中区的铜(钼、铀)矿化作用,贯穿在裂谷演化作用的始终,主要成矿期在裂谷发展的拉张阶段,特别与中条运动(吕梁期,1.8Ga左右)的地质事件关系密切。

STRATIFORM COPPER DEPOSITS WITHIN THE RIFT VALLEYS OF ZHONGTIAOSHAN AREA

Copper deposits in Zhongtiaoshan area of Shanxi are concentrated onthe southern margin of North China Platform. The crust there was cratonizedduring the mid-Archaeozoic era. As a result of subducting by South ChinaPlate, there occurred NE and NW trending deep fractures forming fork-likerift valleys. During the late Archaeozoic, there was bimodal volcanism,alkalic magma eruption and intrusion, showing the tension-riftedcharacteristics of the valleys. Up-to mid-proterozoic, calcic-alkalic magmawas produced by squeeze and pressure, and the rift valleys extincted afterbeing covered by andesite. The copper (molybdenum,uranium) metallogeneticprocesses in this area lasted the whole evolution period of the rift valleys.The major metallogenetic stages were in the tensional fracturing stageand might be closely associated with the geological events of ZhongtiaoMovement (Lu Liang Movement, about 1800 m.y.).