胶东东部荣成超单元的岩石谱系划分及成因探讨

CLASSIFICATION OF ROCK PEDIGREE OF RONGCHENG

摘要:

胶东东部广泛发育的一套片麻状花岗闪长岩—二长花岗岩系列，依据同源岩浆演化理论，可划分为大时家、威海两个亚超单元，共１０个单元，归并为荣成超单元。该超单元位于秦岭大别胶南造山带的北东段，呈ＮＥ—ＮＮＥ向展布，侵入于早元古代荆山群及中元古代海阳所超单元中，并被晚元古代玲珑超单元所侵入，形成时代为晚元古代晋宁期（同位素年龄值６４８～８９０Ｍａ），属华北板块与扬子板块碰撞同构造期花岗岩。其中大时家亚超单元形成于活动板块边缘，导源于洋陆俯冲以幔源物质为主，硅铝质物质为辅的壳幔混合岩浆；威海亚超单元形成于陆陆碰撞带，为硅铝质陆壳广泛熔融的产物。

Abstract:

the basis of comagmatic evolution theory,the gneissic granodiorite and monzonitic granite which widely spread in the east of Jiaodong (east of Shandong) can be divided into Dashijia and weihai sub-superunit and 10 units,and constitutes Rongcheng superunit.This superunit distributes in northeast part of Qinling-Dabei-Jiaonan tectonic belt,strenching in NE to NNE,intruding into Paleoproterozoic Jingshan group and Mesoproterozoic Haiyangsuo superunit,intruded by Neoproterozoic Linglong superunit,and formed ...