海南岭壳铜(银-金)矿床地质特征及找矿方向

岭壳铜(银-金)矿床赋存于白垩纪岭壳村组流纹质角砾凝灰熔岩和早白垩世花岗闪长岩中.目前已发现11条铜(银-金)矿(化)体,矿体的产出严格受断裂破碎带控制,与成矿关系密切的围岩蚀变呈现出自东(20线)向西的钾化→绢云母化→强高岭石化、绿泥石化蚀变分带,矿化相应呈现从铜(金)向铜(银)的过渡.根据其对称性的蚀变分带,应加强20线以东的地质找矿;根据成矿元素分形和统计研究发现,Au,Ag矿化具有专属性,即在流纹质凝灰熔岩中寻找Cu,Ag矿,而在花岗闪长岩中以寻找Cu,Au矿为主.

GEOLOGICAL CHARACTERISTICS AND PROSPECTING DIRECTIONS IN LINGQIAO Cu(Ag-Au) DEPOSIT,HAINAN PROVINCE

Lingqiao Cu(Ag-Au) deposit is hosted in rhyolitic breccia tuffaceous lava of the Cretaceous Lingqiao formation and in the early Cretaceous granodiorite.At present,eleven ore(mineralized) bodies have been discovered.These ore bodies are strictly controlled by fault zones.The ore-related wallrock alteration can be divided into potassium zone,sericitization zone,strong kaolinization and chloritization zone from east(exploration line 20) to the west.And ore mineralizing types change from Cu-Au to Cu-Ag.Systematic studies of the ore geological characteristics show that the mineralization characteristics of the Lingqiao deposit are similar to that of the classical porphyry copper deposit.Therefore,further prospecting work should be focused on the region in east of exploration line 20 according to the symmetry alteration zoning features of the porphyry copper deposit.Moreover,fractal and statistical analysis of ore-forming elements indicate that Au and Ag mineralization are developed in specified rocks,that is,rhyolitic breccia tuffaceous lava is benefit to Cu and Ag mineralization,while the granodiorite is the main Cu and Au hosting rock.