小松山超基性杂岩体橄榄石的岩组分析  

FABRIC ANALYSIS OF OLIVINE FROM XIAOSONGSHAN ULTRABASIC COMPLEXS

作　　者：赵东宏[1] 

机构地区：[1]西安地质矿产研究所,西安710054

出　　处：《陕西地质》2003年第2期45-48,共4页Geology of Shaanxi

摘　　要：沿贺兰山台褶带北部西缘深大断裂带分布的小松山超基性杂岩体属岩浆结晶分异形成的似层状含铬岩体 ,岩组分析表明岩体中橄榄石具有高度的定向性。笔者通过研究认为 ,这种定向性系岩浆上侵过程中的流动分异作用影响造成 。Xiaosongshan ultrabasic Complex is Cr bearing layeroid body formed by the crystallization and differentiation of magm.It is located in deep profound zone at the west side of Northern part of the folded belt in Helanshan platform. Fabric analysis suggests that the olivine in the complex has a intensely oriented direction.Based on the analysis of formation principle,the author thinks that the oriented direction of olivine was formed by the influence of flow differentiation in the upswing course of magma from magma chamber,and it also reflects that Xiaosongshan ultrabasic Complex was formed in unstable tectonic setting.

关 键 词：超基性杂岩体 橄榄石 岩组分析 小松山 

分 类 号：P588.125[天文地球—岩石学]