二连盆地北部中新生代火山岩地球化学特征及地质意义

GEOCHEMICAL FEATURE AND GEOLOGIC MEANING OF MESO-CENOZOIC VOLCANIC ROCK IN NORTHERN ERLIAN BASIN

岩浆岩的化学成分特别是微量元素的含量及分布特征反映了其物质来源和大地构造背景。本文通过对中生代—新生代二连盆地北部典型火山岩样品的分析和结果处理 ,认为中生代的火山岩以碱性系列为主 ,轻稀土元素相对富集 ,产生于大陆板块环境 ;新生代火山岩的岩浆来源较深 ,形成于大陆裂谷环境。这对二连盆地的形成及演化研究提供了基础资料。

The chemical compositions of magmatite reflect the material source and the tectonic background,especially the content and distribution of microelements.By means of analyzing and processing typical Meso Cenozoic volcanic rocks in the northern Erlian basin,it is considered that the Mesozoic volcanic rocks are dominated by alkalibasalt,the light rare earth elements concerntrate relatively and come out continent plate surrounding;And the magma of Cenozoic volcanic rocks come from deep crust and they form in rift valley of continent.It presents basic material to research the formation and evolution of the Erlian basin.