山东胶北地体的前寒武纪地层问题

详细信息

刊出日期: 1995-08-15

PROBLEMS ON PRECAMBRIAN STRATA OF THE JIAOBEI TERRANE,SHANDONG PROVINCE

Publish Date: 15 August 1995

摘要: 认为胶东群应当完全解体，大于２５００Ｍａ的地层为第一期绿岩，２５００－２３００Ｍａ的地层为第二期绿岩，２３００－１８５０Ｍａ的地层主要为孔达岩系；蓬菜群的时代，在否定证据不足的情况下，仍沿用前人确定的震旦纪为宜。胶北地体前寒武纪地质构造基本格架是：以胶北群和齐山群组成的变质核为中心，粉子山群围绕其四周分布呈“洋葱状”构造。

Abstract: An intensive study of Precambrian strata of the Jiaobei terrane is of great significance forsolving the problems on geological evolution,tectonic framework and mineralization,The au-thors hold that the Jiaodong Group can be dismembered into three units:the strata older than2500 Ma are the first-phase greenstone,those ranging in age from 2500 to 2300 Ma are the sec-ond-phase greenstone,and those from 2300 to 1850 Ma are khondalite. It is advisable that Sini-an be still applied for the age of the Penglai Group before enough evidence is obtained to negatethis age. Based on the above-mentioned stratigraphic sequences,the Precambrian tectonicframework of the Jiaobei terrane can be described as an onion-shaped structure with the meta-morphic core composed of the Jiaobei and Qishan Groups as the center surrounded by the Fen-zishan Group.