大同地区玄武岩的岩石学特征

大同盆地第四纪的火山可以划分为两部分:西北区(通常称大同火山群)和东南区。西北区的火山群属典型的中心式喷发,其玄武熔岩是碱性橄榄玄武岩。东南区的火山岩属裂隙式喷溢,其玄武岩流主要是由橄榄拉斑玄武岩组成。本文概括了这两个地区的玄武岩类在岩石学、地球化学、稀土和微量元素等方面的差别和各自的特点

CHARACTERISTICS OF PETROLOGY OF THE DATONG BASALTS

For the Datong basin Quaternary volcanic group can be subdivided into two parts:the northwestern area (i.e.the Datong volcanic group) and the southeastern area.The volcanoes in the northwestern area are typical of the central eruption with basaltic lavas of alkaline olivine basalts and ones in the southeastern area of fissure effusion with basaltic lava flow mainly consisting of olivine tholeiites.This paper studies difference between volcanic rocks in the two areas on the basis of petrology,geochemistry,rare earth elements,trace elements and their charactristics