摘要
韩长冲地区主要由超高压变质岩、碱长花岗片麻岩、二长花岗片麻岩组成。前者包括超高压片麻岩、大理岩、榴辉岩和石英硬玉岩等。其中存在由黑云斜长片麻岩、石英硬玉岩、大理岩及层状榴辉岩组成的超高压变质表壳岩组合。超高压变质岩先后经过柯石英榴辉岩相、石英榴辉岩相、角闪岩相及绿片岩相多阶段的变质作用；经过榴辉岩相、角闪岩相、角闪岩相后及脆性等四期变形。其中角闪岩相变形形成本区的主要构造要素，以发育大量Ａ型褶皱及普遍的糜棱岩化为特征。碱长花岗片麻岩及二长花岗片麻岩只经过角闪岩相及其后的变质和变形作用。超高压变质岩与碱长花岗片麻岩呈侵入接触，可能沿缓倾向ＳＳＥ的韧性剪切带逆掩于二长花岗片麻岩之上。
The main rochs in the Hanchangchong are ultrahigh pressure metamorphic (UHP) rocks,allkali granitic gneiss and monzonitic gneiss The UHP rocks are composed of high pressure gneiss,marhle,eclogite and quratz-jadeitite,in which there is a UHP metamophosed supracrustal rock association composed of biotite plagiochase gnsiss, quartz-jadeitite,marble and bended eclogite The UHP rocks suffered coesite-ecogite facies,quartx-ecloite facies,amphibolite facies and green schist facies metamorphism,and underwent eclogite facies,amphibolite facies and post-amphibolite facies and brittle deformation,in which the amphibolite facies deformation is the main deformation and characterized by A-type folding and extensive mylonization The alkali granitic gneiss and monzomitic gneiss show only amphibolite facies and post-amphibolite facies metamophism and deformation The UHP rocks were intruded by the alkali-ganitic gneiss and possibly overthrust over the monzonitic gneiss along the ductile shear zonergently dipping to SSE
出处
《安徽地质》
1998年第1期10-18,共9页
Geology of Anhui
