滇西上芒岗金矿床地质地球化学特征  

GEOLOGICAL-GEOCHEMICAL CHARACTERISTICS OF SHANGMANGG ANG GOLD DEPOSIT, WESTERN YUNNAN

作　　者：李红阳[1] 高振敏[1] 杨竹森[1] 罗泰义[1] 饶文波[1] 陶琰[1] 高永丰[2] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学开放室,贵州贵阳550002 [2]石家庄经济学院资源与环境工程系,河北石家庄050031

出　　处：《矿物学报》2001年第4期639-646,共8页Acta Mineralogica Sinica

基　　金：中国科学院重大项目 (编号 :KZ 95 1 A1 40 4 0 2 ) ;王宽城教育基金;矿床地球化学开放基金 (编号 :980 418)

摘　　要：上芒岗金矿由下部原生卡林型和上部红色粘土型金矿体所组成 ,赋矿地层为侏罗系勐戛组砂泥质岩、白云质灰岩和二叠系沙子坡组泥硅质灰岩、白云岩。北东向上芒岗断裂构造与不整合面和岩溶的复合控制了矿床和矿体。围岩蚀变以硅化 (似碧玉岩化 )、黄铁矿化、碳酸盐化和粘土化为主 ,并具有水平与垂向分带性。地球化学研究表明 ,蚀变与矿化岩石的稀土含量与未蚀变泥质灰岩基本一致 ,成矿溶液为富Cl 型和富SO4 2 型 ,爆裂温度为1 83～378℃ ,δ3 4S =6 .4 71‰～ 2 1 .96 5‰ ,δ18O =9.3‰～ 1 1 .6‰ ,δD = 70‰～ 77‰ ,2 0 6Pb/2 0 4 Pb =1 9.5 5 1～ 2 0 .0 5 ,　2 0 7Pb/2 0 4 Pb =1 5 .6 90～1 6 .2 4 0 ,2 0 8Pb/2 0 4 Pb=38.71 0～ 4 0 .1 37。红色粘土型矿石的红土化作用只达到粘土阶段。The Shangmanggang gold deposit is characterized by occurring as the upper red clay type and lower Carlin type. It is hosted in the arenaceous argillaceous rock and dolomitic limestone of the Jurassic Mengga Formation and the argillaceous siliceous limestone of the Permian Shazipo Formation. The Shangmanggang gold deposit and its orebodies are strongly controlled by the Shangmanggang northeast trending fault, discontinuity, and karst. Wall rock alterations, with a well developed horizontal and vertical zonation, are dominantly silicification (jasperoidization), pyritization, carbonatization, and clayization. The REE contents of various altered and mineralized rocks are much closer to those of the unaltered argillaceous limestone. The ore forming fluid was of the Cl rich type and SO 2 4rich type. Filling temperatures range from 183 to 378℃. The δ 34 S values range from 6.471‰ to 21.965‰. The δ 18 O values fall within the range of 9.3‰～11.6‰. The calculated δD values are 70‰～77‰. The Pb isotope ratios are as follows: 206 Pb/ 204 Pb=19.551～ 20.05 , 207 Pb/ 204 Pb=15.690～16.240,and 208 Pb/ 204 Pb=38.710～40.137. The lateritization of the red clay type ore is of the clay stage.

关 键 词：金矿床 地质地球化学特征 云南 粘土化 围岩蚀变 成矿作用 红土化作用 

分 类 号：P618.51[天文地球—矿床学]