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.
出处
《现代地质》
CAS
CSCD
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)
关键词
固溶体
透辉石
地幔岩
温压计
出溶叶片
玄武岩
solid solution
diopside
mantle rock
thermobarometer
exsolution lamellae
