中条山北段元古宙岩浆活动与陆壳生长机制  

PROTEROZOIC MAGMATISM AND MECHANISM OF CONTINENTAL CRUST AL GROWTH IN THE NORTHERN SECTOR OF THE ZHONGTIAO MOUNTAINS

作　　者：朱勤文[1] 叶德隆[1] 叶松 

机构地区：[1]中国地质大学

出　　处：《地质论评》1997年第3期257-263,共7页Geological Review

摘　　要：中条山北段元古宙未变质和变质的火成岩分属于3大阶段5期岩浆活动的产物。综合分析本区火成岩的岩石学、地球化学特征和沉积相与变质变形作用的关系后提出,中条山北段元古宙时期不是大陆裂谷,而是古大陆边缘活动带。中基性岩浆活动是该区元古宙地壳演化的重要组成部分,幔源基性岩浆的底侵导致了陆壳的垂向增生,而两期火山活动则导致了陆壳的水平侧向增生。The Proterozoic non-metamorphic and metamorphic igneous rocks in the northern sector of the Zhongtiao Mountains are products of three stages and five periods of magmatic activities. A comprehensive analysis has been made on the geological, petrological geochemical features of these igneous rocks and the sedimentary facies and metamorphism. The results indicate that in the Proterozoic the northern sector of the Zhongtiao Mountains appeared to be not a simple continental rift but a paleocontinental-margin mobile belt. The intermediate-basic magmatism was an important component part of the Proterozoic crustal evolution. The underplating of mantle-derived basic magma might lead to vertical growth of continental crust. The volcanic activities during two periods were probebly the mechanism of continental crustal horizontal growth.

关 键 词：岩浆活动 构造环境 陆壳生长 中条山 元古宙 

分 类 号：P588.11[天文地球—岩石学] P547[天文地球—地质学]