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云南金满、水泄铜多金属矿床的Ar-Ar同位素年代学及其地质意义

徐晓春, 黄震, 谢巧勤, 岳书仓, 刘因   

  1. 合肥工业大学资源与环境工程学院,合肥 230009
  • 收稿日期:2004-06-20 修回日期:2004-06-20 出版日期:2004-06-20 发布日期:2004-06-20

Ar-Ar Isotopic Ages of Jinman and Shuixie Copper Polymetallic Deposits in Yunnan Province,and Their Geological Implications

XU Xiao-chun, HUANG Zhen, XIE Qiao-qin, YUE Shu-cang, LIU Yin   

  1. School of Resources Environmental Engineering, Hefei University of Technology, Hefei 230009, China
  • Received:2004-06-20 Revised:2004-06-20 Online:2004-06-20 Published:2004-06-20

摘要: 滇西北兰坪中新生代盆地西缘铜多金属成矿带受澜沧江断裂带控制,赋矿围岩为二叠系至第三系,主要由下二叠统经上三叠统到上侏罗统砂岩、粉砂岩和页岩组成的碎屑岩建造、火山岩建造及含盐红色碎屑岩建造,矿体主要以脉状或透镜状产出。对该成矿带上的金满铜矿床和水泄铜(钴)矿床主成矿阶段的石英进行了^40Ar-^39Ar快中子活化法同位素地质年龄测定,获得坪年龄分别为56.7±1.0Ma和59.2±0.8Ma,且各自与对应的等时年龄在误差范围内完全一致,都可以代表矿石的形成年龄。综合已发表的有关兰坪盆地西缘及盆地内部铜、多金属矿床成岩成矿同位素年代学研究结果,表明两矿床与区域矿床具有一致的成矿时代,反映区域铜、多金属矿床均形成于喜马拉雅造山运动早期统一的地球动力学背景之下。

Abstract: Lanping basin of the northwestern Yunnan province is an important Cu,Ag,polymetallic mineralization-concentrated area in the western China.There are many large,middle and small scale Cu-polymetallic deposits located in three metallogenic belts of the basin.The metallogenic belt of the western border of the basin is characterized by enrichment in copper and controlled by Lancangjiang fault belt.