摘要
清河镇超单元花岗岩，位于华北地台与吉黑地槽拼接带内，同位素年龄值２７４±４Ｍａ（单颗粒锆石Ｐｂ—Ｐｂ法），层于早二叠世。据同源岩浆演化理论，按照岩石谱系单位划分原则，将其划分为阎家堡子单元、籍家街单元、杨木林子单元和吴家沟４个单元。主要岩石类型为二长花岗岩，成因类型为Ｓ型花岗岩类，由于侵位过程中的同构造变形作用，局部形成糜棱岩化花岗岩和片麻状花岗岩，岩浆侵位为膨胀底劈—顶蚀脉动上侵。
糎J1*2] Qinghezhen ultraunit granite occurred in the joining belt of North China platform and Jilin Heilongjiang geosyncline,which its isotopic age is 274±4Ma(by single grained zircon Pb Pb method),belonging to Early Permain epoch.Based on the evolution theory of comagma and subdivision principle of rock lineage unit,it can be subdivided into 4 units:Yanjiapuzi unit,Jijiajie unit,Yangmulingzi unit and Wujiagou unit.The major rock is monzonitic granite and the genesis type is S type granitoid.Because of syntectonic deformation during emplacement,there are mylonitic and gneissic granite locally, and its emplacement mechanism is expansion diapir stoping pulsation uprising.
关键词
清河镇
华北地台
二长花岗岩
地质特征
花岗岩
Qinghe town North China platform Jilin Heilongjiang geosyncline Monzonitic granite S type granite Early Permain
