摘要
山东临朐-昌乐地区新生代火山岩是新近纪中新世-上新世火山活动产生的大陆溢流玄武岩,分为牛山期、山旺期和尧山期,主喷发期为牛山期和尧山期,属于碱性玄武岩系列。火山岩化学成分由早至晚向富碱、钛、钙,贫硅、镁、锰的方向演化,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。玄武岩K-Ar年龄为4.34～18.87Ma。火山岩岩浆来源于上地幔。
The Cenozoic lava in linqu-changle area of shandong province is continental overflow basalt produced in the volcanic activities from Miocene epoch to Pliocene epoch, it can be divided into niushan stage, shanwang stage and yaoshan stage. The major eruption period is in niushan stage and yaoshan stage, the lava belong to alkali basaltoid. Chemical composition of the lava enriched alkali,titanium, calcium and decreased in silicon, magnesium, manganese from forepart to later period, the degree of the magmatic differentiation is more higher the later than the earlier. There are lot of inclusion of Iherzolite, harzburgites and other mantled-derived inclusion and large crystals of sanidinite, augite and spinel. The K-Ar age of the lava is 4.34-18.87Ma. The lava magma is derived from upper mantle.
出处
《上海地质》
2010年第B11期137-139,156,共4页
基金
中国地质调查局项目"山东省1:5万临朐县
王坟幅区域地质调查"
