胶东地区变质地层新划分—新厘定胶东群、荆山群介绍

A NEW DIVISION OF THE METAMORPHOSED STRATA IN THE JIAODONG REGION AN ACCOUNT ON THE NEWLY DELIMITED JIAODONG GROUP AND JINGSHAN GROUP

经近年来区调,对胶东地区变质地层作了新的划分。胶东群得以净化,新建荆山群。重行厘定之胶东群的层序自下而上:唐家庄组、英庄夼组、齐山组和林家寨组,原岩系一套火山碎屑和火山碎屑沉积岩,属晚太古代;荆山群自下而上:禄格庄组、野头组、陡崖组,原岩为一套富铝泥砂质——钙镁质碳酸盐岩沉积,属早元古代。

A new division of the metamorphosed strata in the Jiaodong Region is presented, following the regional geological mapping in the Region in recent years. The Jiaodong Group is purified by separating the Jingshan Group from it. Thus the stratigraphic sequence of the Jiaodong Group, which is of the Late Archaean era, goes like (in the declining order of age): Tangjiazhuang Formation, Yingzhuangkuang Formation, Qishan Formation and linjiazhai Formation, with its source rocks as a feries of pyroclastic rocks and volcaniclastic-sedimentary rocks whereas the stratigraphic sequence of the newly established Jingshan Group, which is of the Early Proterozoic era, goes as (in the declining order of age): Lugezhuang Formation, Yetou Formation and Douya Formation, with its source rocks as a series of Al—rich argillo—arenaceous sediments—calcic—magnesio carbonates.