摘要
中国太古宙地体基本上分布在华北地台范围内,主要为花岗岩绿岩带.少部分为高级变质带.它们的主要特征是:(1)中国的太古宙绿岩带变质程度普遍较高,多为角闪岩相至麻粒岩相;(2)普遍经受后来构造岩浆活动的叠加和改造,它们的活动性显著高于国外的太古宙地体;(3)绿岩带下部的超镁铁质火山岩组合,多以镁铁质火山岩为主,超镁铁质火山岩比较薄;(4)科马提岩主要为玄武岩质科马提岩,可见变余火山组构.中国太古宙地体蕴藏着丰富的矿产,是金、铁的主要来源.
China's Archeozoic Terrane, mainly a granite-greenstone belt, a small part of which been metamorphosed at a high grade, is basically located in North China Platform distributive area. Their principal features arc: (1) generally metamorphosed at a higher degree, most of them went through metamorphism of hornblende to granulite facies; (2) had been remoulded themselves by subsequent repeated
tectonic-magmatic activities; (3) of the volcanic rocks underneath the greenstone belt, the mafic ones
are in a predominant position while the ultramafic ones are subordinate and small in thickness; (4)
blasto-volcanic texture was found in komatiite (mainly basaltic). Chin' Archeozoic terrane, being, rich
in mineral resources, is the principal source of gold and iron ores.
出处
《地质与勘探》
CAS
CSCD
北大核心
1990年第7期1-5,共5页
Geology and Exploration
