【摘要】 硬玉石英岩是大别—苏鲁超高压 (UHP)变质带内重要超高压岩石类型之一 ,其变形机制和动力学背景参数 (应变、应力、应变速率 )对于全面了解超高压造山带的形成和演化有非常重要的意义 .对大别山双河地区超高压硬玉石英岩 3个样品中的主要组成矿物硬玉和石英进行显微组构和透射电镜 (TEM)的初步研究 .晶格优选方位 (LPO)测量成果表明 :硬玉组构类型与绿辉石相近 ,为L ,LS型 ;石英组构类型主要为单斜对称 .TEM研究表明硬玉滑移系以 (1 0 0 ) [0 0 1 ]、(1 1 0 ) [0 0 1 ]及 (1 - 1 0 ) 1 / 2 [1 1 0 ]为主 .石英中位错发育 ,滑移系以 (0 0 0 1 ) [1 1 2 - 0 ]底面滑移为主 ,代表硬玉石英岩折返过程中经历的区域性剪切作用更多还原

【Abstract】 Jadeite-quartzite of Dabie Mountains is one of the important rock types occurring in ultrahigh-pressure (UHP) metamorphic belts. It is significant to study the jadeite-quartzite’s deformation mechanisms and geodynamical parameters (such as stress, strain, strain rate) for the knowledge on the formation and evolution of the Dabie-Sulu ultrahigh-pressure (UHP) metamorphic belts. Three representative samples of the Shuanghe jadeite-quartzite from Dabie UHP belt were undertook by the microfabric and TEM for lattice preferred orientation (LPO). The results show that the LPOs of jadeite are similar to those of omphacite. Their LPOs are L- and LS-type. However, the LPOs of quartze are monoclinic symmetry type. The slip systems of jadeite are mainly (100), (110) and (1-10)1/2. Abundant dislocations develop in quartz, which is of dominant slip system of (0001)-derived from basal glide. The slip system represented regional shearing durin g the exhumation of the UHP belt.更多还原