川西丹巴燕子沟金矿床流体包裹体特征及矿床成因  

Characteristics of fluid inclusions and genesis of Yanzigou gold deposit in Danba area,western Sichuan,China

作　　者：牛刚[1] 熊发挥[2] 周丽芹[2] 宋鹏华[3] 肖渊甫[4] 

机构地区：[1]四川省地质矿产勘查开发局物探队,成都610072 [2]中国地质科学院地质研究所,北京100037 [3]西南大学家蚕基因组生物学国家重点实验室,重庆400715 [4]成都理工大学地球科学学院,成都610059

出　　处：《合肥工业大学学报（自然科学版）》2012年第12期1693-1701,共9页Journal of Hefei University of Technology：Natural Science

基　　金：矿物;岩石;矿床学国家重点学科建设资助项目(SZD0407);成都理工大学地质勘查资助项目(HD0038)

摘　　要：燕子沟金矿床位于四川省丹巴县,大地构造位置位于扬子准地台西缘,松潘—甘孜造山带东缘。泥盆系危关组炭质千枚岩、板岩是主要的赋矿围岩。成矿过程分为沉积成矿期、热液期和风化期,其中热液期是金的主要成矿期。流体成矿过程包括3个阶段:石英-金-硫化物阶段、硫盐-金(银)-石英阶段和铅锌硫化物-金-碳酸盐阶段。流体包裹体以VCO2、LCO2和LH2O三相与两相包裹体为主,主要是H2O-CO2三相水溶液包裹体,另有纯液相和含CO2单相包裹体存在。金的成矿作用主要发生在中温(285～295℃)、浅成(0.11～0.92km)、低盐度(w(NaCl)=2.22%～9.21%)、低密度(0.75～0.85g/cm3)的物理化学条件下,岩浆岩体与矿化关系密切,既为成矿提供热源,也提供了一定的物质来源,并与大气降水共同作用,从而形成了沉积-热液改造型浅成中温金矿床。Yanzigou gold deposit is located in Danba County, Sichuan Province and its tectonic position is located in the west margin of Yangzi quasi platform and the east edge of Songpan-Ganzi orogenic belts. The carbonaceous thousand pieces rock and slate of the Devonian dangerous shut group are the main ore-wall rock. The ore-forming process is divided into sedimentary metalizing period, hydrother- real period and weathering period, and the hydrothermal period is the main mineralization period. The fluid metallogenic process includes the following three stages： quartz-gold-sulfide stage, sulfur salt- gold（silver）-quartz stage and lead and zinc sulfide-gold-carbonate stage. The majority of fluid inclu- sion which are mainly existed in the form of three-phase of Vco2 , Lco2, LH2o and two-phase inclusions, mainly three-phase aqueous inclusions of H20-CO2. Additionally, there are pure liquid and CO2 con- taining single-phase inclusions. Gold mineralization mainly occurs in the physical and chemical condi- tions of mesotherm （285-295℃）, epithermal （0. 11-0.92 kin）, low salinity （w （NaC1） = 2. 22G- 9.21%） and low density（0. 75-0. 85 g/cm3）. There is close relationship between magmatic rock and mineralization, for the magmatic rock not only provides heat source but certain material source, and works together with the function of meteoric precipitation, thereby forming the gold deposits of sedi mentary-hydrothermal hypabyssal temperature.

关 键 词：川西丹巴 燕子沟金矿床 流体包裹体 矿床成因 

分 类 号：P618.130.2[天文地球—矿床学]