大山火山锥幔源包体与寄主岩成因分析  

A Study on the Genesis of the Mantle-Derived Inclusions and the Host Rock in Dashan Volcanic Cone

作　　者：高知云[1] 章廉澄 

机构地区：[1]西北大学地质学系

出　　处：《西北大学学报（自然科学版）》1994年第1期61-65,共5页Journal of Northwest University（Natural Science Edition）

摘　　要：认为大山火山锥由过碱性霞石岩组成，其中含尖晶石二辉橄榄岩包体和捕虏晶；包体与寄主岩共存，但二者无成因联系；寄主岩是石榴石二辉橄榄岩部分熔融的产物，形成深度在７５ｋｍ以下；包体则是５０ｋｍ深处富化地幔岩石碎块及其解离的产物。这一结论对建立渤海裂谷区的上地幔剖面具重要意义。Dashan volcanic cone is composed of the nephelinite , containing a Large quantity of themantle,derived inclusions. The host rocks were formed in the garnet-lherjolite source areas under75km. The spinel-lherjolite inclusions are the metasomatic mantle-derived rocks and their minerals. They are equilibrium in 1. 7GPb(75km).

关 键 词：火山锥 霞石岩 幔源包体 寄主岩 

分 类 号：P588.14[天文地球—岩石学]