CAJ | 학술논문

平水铜矿是位于扬子板块和华夏板块结合带(即钦杭结合带)北东段的典型火山岩型块状硫化物矿床,其铜矿主要形成于石英-黄铁矿-黄铜矿-闪锌矿阶段.本文对其块状矿体下部发育的含硫化物石英脉中锆石进行了LA-ICP-MS U-Pb精确测年,CL图像和Th/U比值显示锆石多为岩浆成因,测年数据可分为5组:981-988 Ma、(950±15)Ma、(926±13)Ma、(899±21)Ma和93～120 Ma.地质证据和定年结果表明平水铜矿的成矿年龄为新元古代早期(～899 Ma).白垩纪的热事件(93～120 Ma)对矿体进行了叠加改造作用.这一认识对深入了解平水铜矿的成因、形成和演化具有重要地质意义,同时提供了在钦杭结合带寻找火山岩型块状硫化物矿床的年代学信息.
평수동광시위우양자판괴화화하판괴결합대(즉흠항결합대)북동단적전형화산암형괴상류화물광상,기동광주요형성우석영-황철광-황동광-섬자광계단.본문대기괴상광체하부발육적함류화물석영맥중고석진행료LA-ICP-MS U-Pb정학측년,CL도상화Th/U비치현시고석다위암장성인,측년수거가분위5조:981-988 Ma、(950±15)Ma、(926±13)Ma、(899±21)Ma화93～120 Ma.지질증거화정년결과표명평수동광적성광년령위신원고대조기(～899 Ma).백성기적열사건(93～120 Ma)대광체진행료첩가개조작용.저일인식대심입료해평수동광적성인、형성화연화구유중요지질의의,동시제공료재흠항결합대심조화산암형괴상류화물광상적년대학신식.
The Pingshui copper deposit in Zhejiang Province is a typical volcanics-hosted massive sulfide deposit (VHMSD) in the northeast part of Qinzhou-Hangzhou collision belt between Yangtze and Cathaysia blocks. Its copper mineralization occurred mainly in the quartz-pyrite-chalcopyrite-sphalerite stage. This paper reports LA-ICP-MS U-Pb ages of zircon from sulfide-bearing quartz veins beneath the.massive ore body. The results of dating are (981～988) Ma, (950±15) Ma, (926±13) Ma, (899±21) Ma and (93～120) Ma. CL images and Th/U ratios of the zircons show that both Neoproterozoic and Cretaceous zircons are almost of magmatic origin. Geological evidence and the findings indicate that the ore deposit was formed in the Neoproterozoic (～899 Ma) and the ores were affected by Cretaceous (93～120 Ma) thermal event. These results are of great significance for further researches on the genesis, formation and evolution of the Pingshui copper deposit and also provide chronological information in search for contemporaneous VHMSD along the Qinzhou-Hangzhou collision belt between Yangtze and Cathaysia blocks.