绿岩带与胶东花岗－绿岩地体

Early Precambrian Greenstone Belts and Jiaodong Granite-Greenstone Terrain

本文通过对胶东地区早前寒武变质地层和花岗岩的研究，提出胶东绿岩带在变质地层、同位素年龄、变质程度、韧性剪切带和矿产等方面存在的证据，与世界典型绿岩带相比，胶东绿岩带具有５个方面的显著特征：①胶东绿岩带下部层位未发现完整科马提岩地层；②胶东绿岩带变质程度较高，一般可达角闪岩相，少数达麻粒岩相；③胶东绿岩带分布面积不大；④胶东绿岩带形成时间在２８．５８～２６亿ａ；⑤胶东绿岩带主要产出Ａｕ，Ａｇ，Ｚｎ，Ｃｕ等矿产。

This paper discussed the early Percambrian greenstone belts in Jiaodong district.The au-thor holds that the Jiaodong greenstone belt is generally similiar to those of the whole world,but additionally Jiaodong greenstone belt has its own characteristics,such as(1)no completekomatiite beds have been found in the lower part of Jiaodong greenstone belt;(2)Jiaodonggreenstone belt has a high metamorphic grade,generally they belong to amphibolite facies,some attain to granulite facies;(3)Jiaodong greenstone belt has a small area distribution;(4)the isotope age of Jiaodong greenstone belt is 2.858-2. 6 Ga;(5)the main mineral de-posits of Jiaodong greenstone belt are Au,Ag,Pb,Zn, Cu,and so on.