论粉子山群的划分与对比

胶北隆起区的福山、蓬莱、莱州等地分布的粉子山群,是一套由石英岩、长石石英岩、片岩、变粒岩、透闪岩、大理岩等中等变质程度的岩石所组合的区域变质岩系,覆于胶东群之上而被上元古界蓬莱群所覆盖。自上而下划分为岗嵛组、巨屯组、张格庄组、祝家夼组。三个地区的粉子山群,在地层层序、沉积旋回和建造、沉积环境、区域变质作用和混合岩化特点、层位与岩性、含矿性诸方面都具有共性,彼此间完全可以对比。但在某些方面,三区又有不同,反映了三个地区成岩时的大地构造环境是相同的,而各自的小环境却有差异。同位素年龄测定结果证明,粉子山群的时代划归为中元古代是合适的。

DIVISION AND CORRELATION OF THE FENZISHAN GROUP

The Fenzishan Group distributed in Fushan,Penglai and Laizhou areas, etc. within the Jiaobei Uplift is a regional metamorphic series composed of quartzite, feldspathic quartzite, schist, leptynite, tremolite and marble with medium metamorphic grade. Underlain by the Jiaodong Group and overlain by the Penglai Group, this group is divided into the Gangyu-, Jutun-, Zhanggezhuang-and Zhujiakuang formations from top to bottom. The Fenzishan Group occurred in the three separate areas share some common aspects, Su...