鲁东造山带榴辉岩变质作用特征及其动力学机制

岩相学研究表明，广泛发育鲁东造山逞中的榴辉岩可以划分为四种类型：第一类为含柯石英及其假象榴辉岩；么二类为含蓝晶石 、黝帘石及多硅白云母等榴辉岩；第三类为石榴石－绿辉石－石英组合榴辉岩；第四类为（角闪石）石榴石－辉及有关岩石（非典型“榴辉岩”）。这四类榴辉岩峰期前进变质矿物共生组合及Ｐ－Ｔ条件估算结果均显示它们应属于高温与超高压变质作用产物，其变质作用ＰＴｔ轨迹表现为顺时针演化趋势，反映出板块俯冲碰

Characteristics and Dynamic Mechanism of Eclogite Metamorphism in Ludong (Eastern Shandong) Orogenic Belt

Petrofacies studies show that eclogites widely distributed in Ludong orogenic belt can be divided into four types, i.e., (1) eclogites containing coesite and its fake, (2) eclogites containing kyanite zoisite, phengite etc., (3) eclogites of garnet-omphacite-quartz association, and (4) rocks of amphibole, garnet and pyroxene association. Mineral intergrowths and P_T conditions of peak metamorphism suggest that these four types of eclogites are products of metamorphism under dominated high temperature and high-superhigh pressure, and PTt paths of metamorphism show clockwise evolution, reflecting the dynamic mechanism of division and collision of tectonic plate.