北秦岭德河黑云二长花岗片麻岩体的成岩时代——TIMS和SHRIMP锆石U-Pb同位素年代学  

The age of the Dehe biotite monzogranite gneiss in the NorthQinling: TIMS and SHRIMP U-Pb zircon dating

作　　者：陈志宏[1] 陆松年[2] 李怀坤[2] 宋彪[3] 李惠民[2] 相振群[2] 

机构地区：[1]中国地质科学院,北京100037 [2]中国地质调查局天津地质矿产研究所,天津300170 [3]北京离子探针中心,北京100037

出　　处：《地质通报》2004年第2期136-141,共6页Geological Bulletin of China

基　　金：国土资源部国际合作与科技司项目(编号:2000305);国家自然科学基金重点项目(编号:40032010-c)研究成果

摘　　要：德河黑云母二长花岗片麻岩体侵位于秦岭造山带北秦岭前寒武纪变质岩系内,遭受了强烈的变形作用改造,具有典型S型花岗岩的矿物组成特征。TIMS和SHRIMP法锆石U-Pb同位素年龄测定结果分别为(964.4±5.2)Ma和(943±18)Ma,两者在误差范围内是一致的。鉴于SHRIMP法锆石微区测年具有更好的代表性,建议以(943±18)Ma代表德河黑云母二长花岗片麻岩的侵位时代。The Dehe biotite monzogranite gneiss is intruded in the North Qinling Precambrian metamorphic series in the Qinling orogen and has undergone strong reworking, exhibiting the mineralogical characteristic of typical S-type granite. TIMS and SHRIMP U-Pb zircon dating give ages of 964.4±5.2 Ma and 943±18 Ma respectively, which are consistent in the error range. The authors suggest that the 943±18 Ma age represents the age of emplacement of the Dehe biotite monzogranite gneiss in consideration that the SHRIMP age is more representative.

关 键 词：豫西西峡县德河村 黑云母二长花岗片麻岩 锆石U-Pb年龄 TIMS测年 SHRIMP测年 

分 类 号：P588.121[天文地球—岩石学] P588.345[天文地球—地质学]