摘要
铜陵是中国著名的铜 (金 )、铁成矿带 ,其金属矿产与区内燕山期侵入岩有着密切的时空、成因联系。对与铜陵地区典型的夕卡岩型朝山金矿有关的辉石闪长岩中的锆石进行了SHRIMP精确定年研究 ,辉石闪长岩锆石2 0 6Pb/2 3 8U年龄为14 2 .9± 1.1Ma ,结合新获得的新桥矶头石英闪长岩和铜官山石英闪长岩的锆石U Pb年龄。认为铜陵地区幔源岩浆底侵作用发生在早白垩世 (133± 14 3Ma) ,这一时期也是成矿的重要时期。
Sensitive High Resolution Ion Microprobe (SHRIMP) U-Pb zircon dating of pyroxene diorite from the Chaoshan gold deposit in Tonglin mineral district of Anhui Province indicates intrusive activity at 142.9±1.1 Ma. New U-Pb ages were obtained for quartz diorite from Tongguanshan quartz diorite and the Xinqiao Cu-S-Fe-Au deposit. These data indicate that mantle source magma-tic underplating occurred in Early Cretaceous (133~143 Ma). This suggests that magma-tism and associated ore-forming process became active in this area since the Yanshanian movement.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2004年第4期423-427,共5页
Acta Geoscientica Sinica
基金
国土资源部国际合作与科技司"同位素新技术的地质应用研究"项目 ( 2 0 0 10 2 0 9)资助
关键词
金属矿产
侵入岩
夕卡岩
辉石闪长岩
地质年代学
SHRIMP U-Pb geochronlogy pyroxene diorite the Chaoshan gold deposit underplating