山东胶南-威海造山带荣成岩套花岗质片麻岩的形成时代——锆石SHRIMP U-Pb定年  

The Forming Age of Granitic Gneiss in Rongcheng Rock Series in Jiaonan-Weihai Orogen Belt

作　　者：王世进[1] 万渝生[2,3] 宋志勇[1] 王伟[4] 董春艳[2] 张贵丽[1] 

机构地区：[1]山东省地质调查院,山东济南250013 [2]中国地质科学院地质研究所,北京100037 [3]北京离子探针中心,北京100037 [4]中国科学院地质与地球物理研究所,北京100029

出　　处：《山东国土资源》2012年第5期1-8,共8页Shandong Land and Resources

摘　　要：胶南-威海造山带荣成岩套花岗质片麻岩由闪长质片麻岩-石英闪长质片麻岩-英云闪长质片麻岩-奥长花岗质片麻岩-花岗闪长质片麻岩-黑云二长花岗质片麻岩-二长花岗质片麻岩类组成,早期为TTG质花岗岩,晚期为二长花岗岩类。自早到晚存在明显的富钾演化特征。根据新的SHRIMP U-Pb锆石定年结果,该岩套早期闪长质片麻岩年龄为(741±10)Ma,英云闪长质片麻岩年龄为780～760Ma。晚期二长花岗质片麻岩年龄为760～714Ma。所以,可把荣成岩套花岗岩时代限定在800～700Ma之间(南华纪),其形成与华北克拉通岩石圈减薄有关。Granitic gneisses in Rongcheng rock series of Jiaonan- Weihai orogen belt is composed of dioritic gneiss - quartz dioritic gneiss - tonalitic gneiss - trondhjemitic granitic gneiss - granodioritic gneiss - biotite monzonitic granitic gneiss -monzonitic granite. It is TTG granitoids in early period, while is monzogranite in the late period. It has obvious evolution characteristics of potassium - rich from early to late period. Ac- cording to new SHRIMP U- Pb zircon dating results, the age of dioritic gneiss in early period is （741± 10） Ma, and the age of tonalite gneiss is 780-760Ma. The age 714Ma. Therefore, the era tion has close relation with of Rongcheng rock series is limited lithospheric thinning of the North of adamellite gneiss in late period is 760 between 800-700Ma （Nanhua）. Its forma- China craton.

关 键 词：荣成岩套 花岗质片麻岩 南华纪 SHRIMP U-PB定年 胶南-威海造山带 山东省 

分 类 号：P597.3[天文地球—地球化学]