哈达门沟金矿床地质特征及其形成时代研究  

GEOLOGICAL CHARACTERISTIS AND THE TIMING OF THE GOLD MINERALIZATION IN HADAMENGOU GOLD DEPOSIT, INNER MONGOLIA

作　　者：苗来成[1] Yu-min.QIU 关康[1] NealMcNaughton 裘有守[1] 罗镇宽[1] DavidGroves 

机构地区：[1]天津地质研究院,天津300061 [2]CentreforStrategicMineralDeposits,DepartmentofGeologyandGeophysics,theUniversityofWestemAustralia

出　　处：《地质找矿论丛》1999年第4期76-82,共7页Contributions to Geology and Mineral Resources Research

基　　金："中国-西澳经济技术基金"!"中国华北克拉通北缘金矿床区域成矿条件和矿床成因"研究项目部分成果

摘　　要：哈达门沟金矿床位于华北地台北缘西段,产于新太古代乌拉山岩群变质岩系中。矿床以发育一系列含金钾长石-石英脉为特征,这些钾长石-石英脉沿近东西向的韧、脆性叠加断裂成群产出。钾长石化是最发育的近矿围岩蚀变。采用离子探针(SHRIMP)对矿体边部的钾长石化蚀变岩锆石U-Pb 定年结果表明:矿化钾长石化蚀变岩的年龄为132±2 Ma。由于钾长石化蚀变岩本身被金矿化,因此金矿化年龄小于或接近于132±2 Ma,应为燕山晚期成矿。Hademengou gold deposit in the western portion of the northen margin of the North China Craton, is hosted by the metamorphic rocks of the Wulashan Group with New Archaean age. The gold deposit is characterized by swarms of K feldspar quartz veins which occurred along nearly E W trending faults undergone ductile and brittle deformations. The potassic alteration is the strongest wall rock alteration around the orebodies. One sample collected from the potassic alteration rock immediately beside the orebody No.13 in Hademengou gold deposit has been analyzed using Sensitive High Resolution Ion Microprobe (SHRIMP) technique. The result shows that the mineralized polassic alleration rock formed at 132±2 Ma thus gold mineralization dating should be less than or approximate to 132±2 Ma, that is, the gold mineralization in Hademengou gold deposit took place during Late Yanshanian Period which is similar to gold mineralization in Jiaodong area, China.

关 键 词：哈达门沟 金矿床 成矿时代 锆石 地质特征 

分 类 号：P618.510.2[天文地球—矿床学]