大椅山玄武岩中幔源透辉石岩的辉石出溶作用及其地质意义  

PYROXENE EXSOLUTION IN DIOPSIDE PYROXENITE IN DAYISHAN BASALT AND ITS GEOLOGICAL SIGNIFICANCE

作　　者：罗照华[1] 苏尚国[1] 刘翠[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083

出　　处：《现代地质》2001年第2期184-188,共5页Geoscience

基　　金：国家重点基础研究发展规划项目! (G19980 40 80 3) ;国家"30 5"项目! (96 915 0 70 3)

摘　　要：吉林省辉南县大椅山第四纪玄武岩的幔源透辉石岩包体中发现一种具有斜方辉石和尖晶石出溶叶片的透辉石碎斑 ,认为该碎斑矿物曾经是均一的晶体 ,在后续地质事件的影响下发生了固溶体分解。对透辉石碎斑出溶前后所处的物理化学环境进行的研究表明 ,该区地幔岩在进入玄武质熔浆之前曾经有过上升的历史 ,上升幅度约为 38km。It is discovered that there is a kind of porphyroclastic diopside in mantle derived diopside pyroxenite in Dayishan Quaternary basalt of Huinan County,Jilin Province.It has exsolution lamellae of orthopyroxene and spinel.In this paper,the authors consider it was a heterogeneous crystal.Exsolution was taken place in the subsequence geological events.Its temperature and pressure conditions before and after the exsolution are estimated.It is suggested that the mantle had ascended before it was captured in the basaltic magma.And the uplifted range was about 38 km at the pressure gradient of 35 km/GPa.

关 键 词：固溶体 透辉石 地幔岩 温压计 出溶叶片 玄武岩 

分 类 号：P588.145[天文地球—岩石学]