摘要
大别山超高压变质岩至少经过５期变形。第１期产生于榴辉岩相变质前；第２期大致与榴辉岩相变质作用同步．岩石产生紧密同斜褶皱及榴辉岩相糜棱岩；第３期产生于超高压变质岩向中地壳折返的过程中，以榴辉岩的布丁化及基质的透入性剪切为特征；第４期主要形成剪切条带及伸展沿劈理．是大别山碰撞后差异隆升，岩层向南滑脱的结果；最后一期为脆性变形，岩层沿北东向断层产生左行平移。通过超高压变质岩的变形分析，可以了解超高压变质岩形成和折返的构造运动过程。
The ultrahigh-pressure metamorphic(UHPM)rocks in the Dabie Mountains went through at least five generations of deformation.The first generation of deformation occurred before the eclogite facies metamophism.The second one approximately synchronized with the eclogite factes metamorphism,and the UHPM rocks underwent tight-isedinal folding and eclogite facies myloniization.The third one formed in the exhumation process of the UHPM rocys to fourth one produced asymmetric open-tight folds,shear bands and extensional crenulation cleavages.which were the results of post-collisional uplifting and southward sliping of the UHPM rocks.The last one is a brittle deformation, and the UHPM rocks were cut by NE-trending strike-slip faults and moved left-laterally along the faults.The formation and exhumation processes of the UHPM rocks can be recognized by structure analysis of the UHPM rocks.
出处
《安徽地质》
1996年第3期7-17,86,共12页
Geology of Anhui
基金
国家自然科学基金
安徽省地矿局资助
关键词
大别山
超高压
变形
Dabie Mountains,Ultrahigh-pressure,Deformation
