荣成伟德山岩体的侵位机制

THE EMPLACEMENT MECHANISM OF WEIDESHAN INTRUSIVE BODY IN RONGCHENG

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:

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-...