摘要
安徽潜山硬玉石英岩和榴辉岩共生，呈透镜或似层状产于云母片麻岩中。两类岩石原生矿物组合分别为柯石英＋硬玉＋石榴石＋石英＋金红石和金刚石＋柯石英＋石榴石＋石英＋文石＋黝帘石。本文报导的硬玉石英岩中柯石英及其假象为世界首例。榴辉岩原岩分别为大洋拉斑玄武岩和大陆玄武岩，硬玉石英岩原岩为杂砂岩；两类岩石中矿物组合及其变形特征，表明它们都经历了相同的榴辉岩相超高压变质作用及后期从角闪岩相到绿片岩相的退变质作用的改造；这两种不同构造环境下形成的原岩在一起共生及其强烈的剪切变形，表明它们是经构造作用而混杂在一起的。
The jadeite一quartzite and associated eclogite lenses from Qianshan, Anhui province are sur-rounded by mica(phengite) gneiss. Paragenetic association of the peak metamorphism is:Cs +Jd+Gt+Q+Ru in jadeite quartzite and Dia +Cs +Gt +Q+Arg +Zo in eclogite. Coesite inclusions and its pseudomorphsare the first time to be found in jadeite一quartzite, Study of petrology and geochemistry indicates that thejadeite一quartzite was originally graywacke, The rnineral assemblages, ductile and brittle deformnation pre-sented here indicate that both the eclogite and jadeite一quartzite underwent ecIogite facies ultra一high pres-sure metamorphisrn at early stage and then retrograded to amphibolite and greenschist facies。 The paragene-sis of the two different kinds of rocks and its strongly sheared matrix demonstrate that they are derived fromtectonic mingling.
出处
《安徽地质》
1995年第2期7-21,共15页
Geology of Anhui
基金
国家自然科学基金
安徽省地质矿产局资助项目
