新疆西昆仑切列克其铁矿成因——地球化学及流体包裹体证据  

Genesis of Qieliekeqi Iron Deposit in West Kunlun,Xinjiang:Evidence from Geochemistry and Fluid Inclusions

作　　者：曾威[1] 孙丰月[2] 赵财胜[3] 张雪梅[4] 段明[1] 俞礽安[1] 奥琮 

机构地区：[1]中国地质调查局天津地质矿产研究所,天津300170 [2]吉林大学地球科学学院,吉林长春130061 [3]国土资源部科技与国际合作司,北京100812 [4]天津地热勘查开发设计院,天津300250

出　　处：《现代地质》2015年第6期1296-1308,共13页Geoscience

基　　金：中国地质调查局地质大调查项目(1212010630708;1212011220515;12120113068800)

摘　　要：新疆切列克其铁矿位于西昆仑造山带南带,矿体呈层状、似层状产于志留系温泉沟组地层中。在对矿床地质特征进行研究的基础上,开展了详细的岩矿石地球化学及流体包裹体研究,探讨了切列克其铁矿的成因。切列克其铁矿经历了2期成矿作用：早期为海底热水喷流成矿作用,是主要成矿期,主要形成层状、纹层状和条带状矿体,硅质条带中流体包裹体均一温度为140~160℃,盐度为4.79%~5.09%Na Cl eqv,成矿流体为低温低盐度流体;晚期为岩浆热液成矿作用,该期成矿作用造成了菱铁矿的活化迁移,形成了细脉状菱铁矿石,通过对含菱铁矿石英脉中包裹体的研究,可见气液两相、含子矿物三相和富气相3种类型包裹体,成矿流体包括中高温高盐度流体和中低温低盐度流体。Qieliekeqi iron deposit is located in the south belt of West Kunlun orogenic belt. Ore bodies occur as layer,layer-like in Wenquangou Formation. On basis of research on geological characteristics and combining with study of geochemistry and fluid inclusions,we propose that Qieliekeqi deposit mainly formed by hydrothermal exhalative process which formed bedded,lamellar and banded orebodies. The orebodies reformed by magmatic hydrothermal fluids at the later stage,which lead to the formation of veinlet coarse siderite. Homogenization temperature of fluid inclusions in siliceous bands ranges from 140 ℃ to 160 ℃,the salinity is 4. 79%-5. 09% Na Cl eqv. Three types of fluid inclusions are recognized in quartz vein formed in post mineralization stage,which is vapor-liquid type,vapor-rich type and halite-bearing multiphase type. The ore-forming fluids are medium to high temperature with high salinity fluid and low temperature with low salinity fluid.

关 键 词：西昆仑 菱铁矿 热水喷流 流体包裹体 地球化学 新疆 

分 类 号：P618.31[天文地球—矿床学]