乳山西涝口金矿床地质特征及找矿标志

乳山西涝口地处莱阳盆地东北缘,区内岩性复杂多样,断裂构造发育。金矿床产于新元古代震旦期鹊山二长花岗岩体与古元古代荆山群接触带内。主要金矿体赋存于荆山群大理岩的裂隙带中。成矿具有多阶段特点。荆山群中的蚀变大理岩为该区成矿的岩性标志;硅化、钾化、绢云母化、碳酸盐化及黄铁矿化为矿体的蚀变标志;物探激电异常及化探Au,Ag,As,Sb,Bi异常为找矿的间接标志。鹊山岩体与荆山群接触带及与中生代地层接触带为成矿的有利部位,分布于其中的NE向断裂构造与成矿具有密切关系。

Geological Characteristics and Ore Exploration Sign of Xilaokou Gold Deposit in Rushan City

Xilaokou in Rushan city locates in northeast edge of Laiyang basin.Rock property is very complicated with structual fault.Gold deposit occurs in contacting belt of adamellite in Neoproterozoic Sinian period and Paleoproterozoic Jingshan group.Major gold ores occur in diorite fault belt of Jingshan group.Ore-forming has the characteristics of multi-period.Altered diorite in Jingshan group is the symbol of ore-forming,while silicification,potash alteration,sericitization,carbonation and pyritization are alteration symbols.Induced polarization effected by geophysical exploration and Abnomality of Au,Ag, As,Sb and Bi by geochemical exploration are indirect symbol for ore exploration.Contacting belt of Qushan rock and Jingshan group and Contacting belt of Mesozoic strata are good belts for ore-forming.Faults with the trend of NE distributed in this part has close relation with ore-forming.