【作者】 张春池； 杨恩秀； 李秀章； 宁振国； 张贵丽； 王巧云； 朱继托；

【Author】 ZHANG Chun-chi;YANG En-xiu;LI Xiu-zhang;NING Zhen-guo;ZHANG Gui-li;WANG Qiao-yun;ZHU Ji-tuo;Institute of Geological Survey,Shandong province;

【机构】 山东省地质调查院；

【摘要】 山东新生代火山岩是古近纪始新世以来火山活动的产物,分为沙河街旋回、牛山旋回、尧山旋回和史家沟旋回。火山岩化学成分由早至晚向富碱、钛、镁,贫硅、锰、钙的方向演化,属于碱性玄武岩系列,为大陆裂谷型玄武岩。岩浆分异程度晚期较早期高。岩石内有大量二辉橄榄岩、方辉橄榄岩等幔源包体和透长石、普通辉石、尖晶石等巨晶。火山岩岩浆来源于上地幔。玄武岩同位素年龄为48.4~0.33Ma。更多还原

【Abstract】 The igneous rocks are the product of the volcanism since Eocene epoch,which are divided into Shahejie cycle,Niushan cycle,Raoshan cycle and Shijiagou cycle.The igneous rocks are considered to be continental rift valley basalts,the geochemical compositions of which belong to alkaline basalt series,rich in alkali,titanium,magnesium,depleted in silica,manganese and calcium.The magma differentiation is more evolved compared with early stage.Mantlederived plutons containing abundant Iherzolite and harzburgite,and huge grain crystals of feldspar,augite and spinel are observed in the igneous rocks.The igneous magma originated from upper mantle.The isotopic age of the basalt was determined to be 48.4-0.33 Ma.更多还原