内蒙古呼伦贝尔盟博克图南部变质堆晶角闪辉长岩的U-Pb锆石年龄及地质意义  

THE U-Pb ZIRCON AGE OF THE META-CUMULUS BOJITE IN SOUTHERN BUGT, INNER MONGOLIA: Its Geological Implication

作　　者：张明[1] 何会文[1] 

机构地区：[1]内蒙古自治区地质调查院,内蒙古呼和浩特010020

出　　处：《地质与资源》2007年第1期56-58,67,共4页Geology and Resources

摘　　要：博克图南部的变质堆晶角闪辉长岩锆石U-Pb年龄测定结果为2096±36Ma,表明本区的变质堆晶角闪辉长岩形成于古元古代.结合岩石化学及岩石地球化学特征研究表明,岩石可能形成于俯冲环境,是造山作用过程中弧岩浆活动的早期产物,标志着区内一个新的构造岩浆旋回的开始,不能作为古元古代末期大陆裂解的产物.The U-Pb zircon age of the meta-cumulus bojite in southern Bugt, Inner Mongolia is detected to be 2096 ± 36 Ma. The result indicates that the rock was formed in Paleoproterozoic era. Study on the petrochemical and geochemical characteristics shows that it is the product in subduction environment, probably resulted from early volcanic arc magma activity during orogeny. It marks the beginning of a new tectonomagmatic cycle in the area. The rock may not be regarded as the result of the late Paleoproterozoic continental splitting.

关 键 词：博克图 变质堆晶角闪辉长岩 锆石U-PB年龄 地质意义 

分 类 号：P588.3[天文地球—岩石学] P597[天文地球—地质学]