摘要
在3．SGPa、1200℃条件下对取自大别地区的不同类型岩石进行了重结晶实验，并采用偏光显微镜、X射线粒晶衍射和电子探针对实验产物的结晶特点、矿物组成及矿物成分进行了研究。结果表明：①石榴橄榄岩的岩石成因与共生的榴辉岩相同；②榴辉岩的重结晶经历了从单斜辉石岩、石榴辉石岩到榴辉岩的过程；③超高压片麻岩主要由石榴子石、绿辉石、多硅白云母和柯石英组成，不含斜长石、黑云母和绿帘石等常规矿物；④柯石英和文石是超高压岩石的两个基本矿物相。本次实验澄清了一些长期争论的岩石学和矿物学问题。
An experiment on the crystallization of different types of rocks from the Dabie district wasmade at pressure 3. 5GPa and temperature 1200℃. The characters of crystallization, mineral as-semblage and composition of the experimental products have been studied by means of polarizedlight microscope, X-ray powder diffraction and electron probe. The results suggest that: (1) thepetrogenesis of garnet peridotite is similar to that of coexisting eclogite; (2) the recrystallization ofeclogite underwent a process from clinopyroxenite through garnet clinopyroxenite to eclogite f (3)ultrahigh-pressure gneiss is composed mainly of garnet, omphacite,phengite and coesite other thancommon minerals such as plagioclase, quartz, biotite, epidote, etc. ; and (4) coesite and aragoniteare common minerals in ultrahigh-pressure rocks. This experiment provides the basis for ihe solu-tion of some petrological and mineralogical problems.
出处
《矿物学报》
CAS
CSCD
北大核心
1995年第3期305-311,共7页
Acta Mineralogica Sinica
关键词
矿物组合
岩石成因
岩石
超高压结晶
类型
ultrahigh-pressure
recrystallization
mineral assemblage
petrogenesis
