东天山康古尔塔格金矿带两类成矿流体地球化学特征及流体来源  

Geochemical characteristics and source of two-type ore-forming fluids in Kanggultage gold ore belt, east Tianshan.

作　　者：张连昌[1] 姬金生[2] 李华芹[3] 沈远超[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]西安工程学院,西安710054 [3]中国地质科学院宜昌地质矿产研究所,宜昌443003

出　　处：《岩石学报》2000年第4期535-541,共7页Acta Petrologica Sinica

基　　金：国家"三○五"攻关项目;中国科学院黄金创新工程重大项目 (KZCX1-Y-0 3 -0 1)资助

摘　　要：东天山康古尔塔格金矿带位于塔里木地块东北部晚古生代阿齐山 -雅满苏岛孤带的北缘。金矿床主要类型有与脆韧性剪切带有关的蚀变岩型金矿、岩浆热液石英脉型金矿和浅成热液石英脉型金矿。从矿物流体包裹体的类型、均一温度、流体盐度、压力及气液相成分等资料 ,可将该金矿带成矿流体类型划归为浅成热液和中深成热液两类。浅成热液类表现为流体包裹体类型简单、低盐度、低压力、低 CO2 / H2 O和 Na+ / K+ 比值 ;中深成热液类表现为包裹体类型复杂、中等盐度、较大的压力、较高的 CO2 / H2 O及 Na+ / K+ 比值。石英流体包裹体 H、O、Sr同位素组成反映 ,位于康古尔塔格金矿带东段的小尖山、西凤山等金矿床成矿流体主要来源于岩浆水 ,位于矿带西段的西滩等金矿成矿流体主要来自大气降水 ,而位于矿带中段的康古尔等金矿成矿流体来自变质水 。The Kanggultage gold ore belt is located in the northern Late Paleozoic Aqishan Yamansu island arc belt in the northeast of Tarim plate. This glod ore belt includes the gold deposits of altered rock type related to brittle ductile shear zone, magmatic hydrothermal quartz vein type and epitherma1 quartz vein type. According to the data from fluid inclusion types, homogenization temperature, fluid salinity, fluid pressure, gas and liquid phase composition, the ore forming fluid in Kanggultage gold ore belt can be classified into epithermal solution type and mid katathermal solution type. The former shows characteristics of simple inclusion type with lower salinity (0.8~6.7wt%NaCl) and pressure (3.5×10 5~ 50×10 5Pa ), lower CO 2/H 2O ratio (0.00~0.005) and Na +/K + ratio (0.20×10 -6 ~0.29×10 -6 ); the later shows characteristics of complex inclusion type with high salinity (8.5~32.7 wt%NaCl) and pressure (100~1000×10 5Pa), high CO 2/H 2O ratio ( 0.023 ~0.166) and Na +/K + ratio (2.70×10 -6 ~6.68×10 -6 ). The data from hydrogen, oxygen and strontium isotopic composition in fluid inclusions show that mineralizing fluid of Xiaojianshan and Xifengshan gold deposits located in eastern ore belt was magmatic water, that of Xitan gold deposit located in western ore belt was meteoric water and that of Kanggul gold deposit located in middle ore belt was a kind of mixed hydrothermal solution which was composed of metamorphic water, meteoric water and magmatic water.

关 键 词：流体包裹体 成矿流体 流体地球化学 金矿床 

分 类 号：P618.51[天文地球—矿床学] P594[天文地球—地质学]