摘要
根据近期 1:5万区调和科研成果 ,认为大别山镁铁质—超镁铁质岩可划分两期 :一期为前寒武纪变质镁铁质—超镁铁质岩 ,另一期为中生代未变质镁铁质—超镁铁质岩 ,前者由橄榄岩、橄辉岩、辉橄岩、榴辉岩、角闪石岩、斜长角闪岩等组成 ,原岩是由基性 -超基性侵入岩或火山岩经过构造就位的 ;后者由辉石岩、辉闪岩、辉长岩、闪长岩组成 ,属于燕山期基性 -超基性侵入岩 ,具有同源岩浆演化序列。通过对其岩石学、岩石化学、地球化学等详细研究表明 ,大别山目前还不存在蛇绿岩套 ,北大别榴辉岩及燕山期基性 -超基性侵入岩的确定 ,为认识大别造山带的构造演化提供了重要基础资料。
According to recent 1:50000 geological mapping and scientific research, mafic-ultramafic rocks of the Dabieshan can be classified into two terms: One is metamorphosed in Precambrian, the other is unmetamorphosed in Mesozoic. The former consists of peridotite ,eclogite, homblende rock, plagioclase amphibolite etc and the protoliths are mafic-ultramafic intrusire rocks or volcanic rocks by structure reached. The latter is composed of pyroxentie, gabbro, diorite etc, belonging to Yanshan period mafic-ultramafic intrusive rocks, cognate magam evolvution sequence .The petrology, petrochemical, geochemistry study of them indicates that there exists no ophiolite. The determination of eclogite and Yanshan period mafic-ultramafic intrusive rock of the north in the Dabieshan provided important geological basic data for recognizing structual evolvution of the Dabie orogeny .
出处
《火山地质与矿产》
2001年第4期269-277,共9页
Volcanology & Mineral Resources
基金
地质行业发展基金项目 (HY97980 2 9)
安徽地矿局联合资助
