摘要
本文把太古代变质玄武岩分成绿岩带变质玄武岩和高级区变质玄武岩。在地球化学上,这两类玄武岩分别与岛弧-弧后盆地玄武岩和大洋中脊-弧后盆地玄武岩相似。推测它们形成的大地构造环境与现代岛弧-弧后盆地和大洋中脊-弧后盆地有一定相似之处,尽管太古代放射生热比现代高2—4倍。
The Archaean meta-basalts are distinguished into two meta-basalts formed in the greenstone belt and in the high-grade metamorphic region. These two types of meta-basalts are geo-chemically similar to those on the island arc-back basin and those between the mid-ocean ridge and arc-back basin respectively. It is possible that the Archaean meta-basalts erupted in the geological settings which are different in form but not in essence from the recent geological setting, although radiogenic heat is in the Archaean is 2-4 times higher than in the present
出处
《地质科学》
CAS
CSCD
北大核心
1991年第3期222-230,共9页
Chinese Journal of Geology(Scientia Geologica Sinica)
关键词
玄武岩
太古代
地球化学
大地构造
Archaean basalts, geochemistry, geotectonic setting
