论文部分内容阅读
含柯石英、金刚石榴辉岩是南大别超高压变质岩石的主体,在这些榴辉岩的未退变质核心、退变质斜长角闪岩及超高压围岩中,保存有大量不同变质时期的宏观—微观变形构造.其中主要的变形构造是在单剪应力状态下,由具有顶端指向NW动向的角闪岩相变形作用D2形成的a型褶皱F2,以共轴样式叠加于纯剪应力状态下榴辉岩相变形作用D1形成的斜卧褶皱F1之上的二次叠加褶皱,总体形态符合Ramsay第三种干涉型.这两期变形作用揭示了超高压变质岩石在折返过程中存在两种动力学机制,它们相续作用才使得这些超高压岩石出露地表.
The coesite-bearing and eclogite-bearing eclogites are the main bodies of the ultra-high-pressure metamorphic rocks in the South Dabie area. In these retrograde metamorphic amphiboles and retrogressive amphibolite and ultrahigh-pressure wall rocks, a large number of different metamorphic periods Macro - micro deformation structure. Among them, the main deformation structure is a-type fold F2 formed by the amphibolite facies deformation D2 with the top pointing to the NW direction under the condition of single shear stress, and co-axially superimposed on the eclogite facies deformation under pure shear stress Effect of D1 formation of the reclining fold F1 fold over the second fold, the overall shape in line with Ramsay third interference type. These two phases of deformation reveal that there are two kinds of dynamical mechanisms in the UHP metamorphic rocks during the reentry, and their continuation of the UHP metamorphic rocks has exposed the surface of the UHP rocks.