胶东地区郭家岭岩体岩石构造组合特征及地质意义

摘要

通过对前人就郭家岭花岗岩构造地质学、岩石化学、同位素年代学等地质信息资料的分析、研究，认为胶东地区郭家岭花岗闪长岩一花岗岩总体上归属于幔源岩浆与壳源岩浆混合后经分异作用而成的同熔深成型花岗岩类；主要形成于由洋壳俯冲引起的火山岛弧环境、大陆碰撞环境和弧后拉张性质的大陆边缘环境；其定位机制为：沿着NEE向挤压带从小面积到大面积频率式脉动或涌动热轻气球膨胀式定位；该岩石构造组合主体形成于早白垩世。从岩石构造组合的概念，将其定义为造山中期郭家岭弱片麻状花岗闪长岩～花岗岩组合。%Through analysis and study on previous information of granite tectonics, petroclaemlstry, isotope geochronology and other geological information of Guojialing group, it is regarded that granodiorite--granite of Guojialing group in Jiaodong area generally belongs to syntexis plutonic granites which were formed by differentiation after the mixture of mantle--derived magma and crustal magma. It was mainly formed by volcanic island arc environment, continental collision and back--arc extensional environment casued by the subduction of oceanic crust. Its positioning mechanism is as follows： small square to large square of squee- zing belts with the trend of NNE frequency pulse type or magma swelling hot--air balloon expandable positioning. This combination body was formed in early Cretaceous. From the concept of rock combination, it is defined as the Guojialing weak gneissic granodiorite and granite combination in middle orogenic period.