万岩基性火山-侵入杂岩的地球化学及其构造背景

来源期刊：中南大学学报(自然科学版)1993年第2期

论文作者：刘继顺 何绍勋 肖禧砥

文章页码：149 - 154

关键词：火山-侵入杂岩; 地球化学; 板内玄武岩; 伸展构造; 湖南

Key words：volcanic-intrusive complex; geochemistry; intraplate basalt; extension; Hunan

摘    要：万岩基性火山-侵入杂岩地处湖南省古丈县境内,江南古陆的西北缘,主要由超浅成的辉长-辉绿岩、基性熔岩和火山碎屑岩所组成。岩石化学和微量元素、稀土元素以及钕同位素地球化学研究表明,万岩基性火山-侵入杂岩属碱性-钙碱性系列的板块内部(即大陆内部)火山作用的产物,形成于雪峰期大陆拉张伸展构造背景之下。

Abstract: Located in the northwest of Jiangnan Old Landmass,Hunan,South China,Wanyan vol-canic-intrusive complex consists mostly of ultra-supergene gabbro-diabases,basic lavas andpyroclastic rocks,belonging to alkaline series-calci-alkaline series.Petrochemistry and geo-chemistries of trace element,REE and Nd isotope reveal that Wanyan complex resulted fromthe intraplate(continental)basic volcanism and developed by the continental extension dur-ing Xuefengian Period.