荣成伟德山岩体的侵位机制  

THE EMPLACEMENT MECHANISM OF WEIDESHAN INTRUSIVE BODY IN RONGCHENG

作　　者：陈守田[1] 刘春华[1] 

机构地区：[1]长春地质学院

出　　处：《山东地质》1996年第1期69-75,共7页Geology of Shandong

摘　　要：伟德山岩体就位于大型韧性剪切带中，是构造后的花岗岩体，侵位时代为１３３—１５８Ｍａ。该岩体为同源岩浆演化的产物，演化规律为早期富含暗色组分，晚期富含浅色组分，并向二长花岗岩方向演化。其岩体形态为条带状和同心环带状。叶理、包体方向平行于接触线，无接触变质晕，条带与围岩协调。岩体向东有横向拓宽的趋势，并改造围岩。根据岩体形成、岩浆演化规律及区域地质构造背景等特征，认为伟德山岩体的侵位机制既不是单纯的被动模式，也非单纯的主动模式，而是以被动、主动先后为主导的侵位机制模式。Abstract Weideshan Intrusive body is a post-tectonic granite-complex which is located in a large ductile shear zone. The time of emplacement was about 133-158Ma. The complex is the product resulted from the evolution of a cognate magma. The rocks formed in the early stage of the evolution are rich in dark-colored minerals whereas those fomed in the late stage of the evolution are rich in light-colored minerals with a trend of the evolution towards morzonitic granite.The complex has a striped and concentric-ring shape. The direction of foliation and inclusions parallel to the contact of line,but there is no contact metamorphic aureole. The strips are coformable to the country rocks. The concentric-ring rocks unconformable to country rocks are widened to the east and make the country rocks reformed.According to the Characteristics of the shape of the complex, the regularity of magma evolution and the regional geological setting, the authors suggest that the emplacement of Weideshan complex fits neither to the pure “passive” model nor to the pure “forceful” model,but the model with the “passive” character dominated in the early time and “forceful” character more prominent in the late stage.Abstract

关 键 词：岩体 侵位机制 花岗岩 伟德山岩体 

分 类 号：P588.121[天文地球—岩石学]