青海北巴颜喀拉山地区浊积岩中金(锑)矿成矿地质特征——以大场—加给陇洼一带为例  

Geological characteristics of Au(Sb) deposits in turbidite sequences in North Bayan Har in Qinghai province——examples from gold deposits in Dachang-Jiageilongwa area

作　　者：赵俊伟[1] 孙丰月[1] 李世金[1] 何安全[2] 范桂忠[2] 马秀兰[2] 

机构地区：[1]吉林大学地球科学学院 [2]青海省地质调查院

出　　处：《黄金》2007年第9期8-13,共6页Gold

基　　金：东昆仑成矿带重大找矿疑难问题研究(项目编号:1212010531404)

摘　　要：北巴颜喀拉造山带是青海重要的贵金属成矿带,金矿床(点)众多,矿床的形成与巴颜喀拉洋的演化有密不可分的联系,矿床的形成与晚华力西—印支早期巴颜喀拉洋的俯冲、碰撞造山作用及该区广泛发生的印支晚期幔源岩浆的侵入活动有较密切的成因联系。赋矿地层为三叠纪巴颜喀拉山群浅变质浊积岩系,与世界上其它地区浊积岩型金矿床类似,相当于Groves等(1998)提出的造山型金矿床。矿脉常顺层产出,层控特征明显,主要产于含碳泥质板岩、变钙泥质粉砂岩中。区内金矿床(点)具有相似的成矿地质—地球化学特征,矿脉受褶皱和韧脆性断裂双重控制,且以韧脆性断裂为主,金矿化强度与蚀变强度呈正比,成矿地质条件优越,已显示出很好的成矿和找矿潜力,研究该区金矿成矿作用和矿床特征具有重要的理论和实际意义。The North Bayan Har orogenic belt is an important metallogenic belt in Qinghai province. Lots of gold deposits formed in it were related closely with the evolution of the Bayan Har Ocean, which formed in the Late Hercynian-Early Indosinian subduction and collision, and late Indosinian mantle-derived magmatic underplating. The orebearing strata are epimetamorphic turbidite sequences of Triassic Bayan Har group, which, is similar with those of other gold deposits in turbidite sequences of the world. Those deposits in study area may belong to orogenic gold deposits proposed by Groves et al （1998）. Bedded veins occur often in turbidite sequences, which are stratabound in carbonaceous argillaceous slate and calcareous argillaceous siltstone. Those Au （Sb） deposits are characterized by similar geological and geochemical characteristics. And veins are controlled by dominant ductile-brittle faults and folds. The gold intensity of mineralization has positive correlation with the intensity of alteration. It was shown that there are excellent metallgonenic conditions and good metallogenic or prospective potentials in this area. Studying the geological characteristics and gold metallogeny in it is of important theoretical and actual meanings.

关 键 词：巴颜喀拉造山带 浊积岩型金(锑)矿 超大型矿床 地质特征 

分 类 号：P618.51[天文地球—矿床学]