牟平、乳山地区早元古代地层

PALEOPROTEROZOIC STRATA IN MUPINGAND RUSHAN AREA

摘要:

牟平、乳山地区的荆山群出露较全，依其原岩性质、变质岩石组合及接触关系，自下而上划分为禄格庄组、野头组和陡崖组，各组根据岩石组合特征可进一步划分为上、下两段。荆山群是继晚太古代胶东群沉积之后，在以升降运动为主且较稳定的浅海陆棚环境中形成的，经历过中压相系高角闪岩相区域变质。其成岩年龄为１８４８～２４８４Ｍａ。年代地层划归下元古界。

Abstract:

The Jingshan group in Muping and Rushan area outcropped relatively completely. According to its protolith characteristics,metamorphic rock associations and contact relationship,it can be divided into Lugezhuang formation,Yetou formation and Douya formation from lower to upper. Every formation can be further divided into upper and lower parts according to the characteristics of rock s associations. It was formed in a mainly going up,but a relatively steady shallow-sea shelf environment after Jiaodong gro...