黑龙江鸡东五星铂钯矿床含矿岩体的锆石U-Pb年龄及其地质意义  

Zircon U—Pb age of mineral-bearing rock body from Wuxing Pt—Pd deposit in Jidong,Heilongjiang Province and its geological significance

作　　者：李光辉[1] 孙景贵[2] 黄永卫[1] 梁树能[2] 李怡欣[2] 崔培龙[2] 郭佳[2] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]吉林大学地球科学学院,长春130061

出　　处：《世界地质》2010年第1期28-32,共5页World Geology

基　　金：国家自然科学基金项目(40472050;40772052)

摘　　要：黑龙江省鸡东五星铂钯矿床的成岩成矿时代长期未能确定。通过对其含矿岩体内的单颗粒锆石SHRIMP U-Pb年龄的测定,获得的12组实验数据的年龄变化区间为35.8-40.3 Ma,加权平均年龄为37.79±0.76 Ma;结合锆石的CL图像特征,初步确立五星含矿岩体的成岩和铜镍、铂钯成矿年龄发生在始新世晚期,考虑其形成时代与敦密断裂带的碱性玄武岩浆喷发作用事件相一致,因此形成环境应与敦密深断裂作用有关,并为东北地区进一步寻找铜镍、铂钯矿床指明了方向。Diagenetic and metallogenetic ages of Wuxing Pt—Pd deposit in Jidong of Heilongjiang Province has been uncertain for a long time.Single zircon SHRIMP U—Pb dating from mineral-bearing rock body indicates that the ages of 12 groups of experimental data are 35.8~40.3 Ma,the weighted mean age is 37.79±0.76 Ma.Combining with the characteristics of zircon CL image,the authors comfirm that the diagenetic time of Wuxing mineral-bearing rock body and the metallogenetic time of Cu—Ni and Pt—Pd are Late Eocene.Considered the formation time being consistent to the eruption event of alkali basalt magmatic in Dunmi fracture zone,it is concluded that the formation environment was related to Dunmi fracture,which shows the direction to look for Cu—Ni、Pt—Pd deposits in Northeast China.

关 键 词：U-PB测年 成岩成矿时代 地质意义 五星铜镍铂钯矿床 黑龙江 

分 类 号：P597[天文地球—地球化学] P618.53[天文地球—地质学]