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岩相学研究表明,广泛发育于鲁东造山带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;第二类为含蓝晶石、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 -辉石岩及有关岩石(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 -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,反映出板块俯冲碰撞动力学机制。
Petrographic studies show that eclogites widely developed in the Ludong orogenic belt can be divided into four types: the first type is coesite-bearing and eclogitic eclogite; the second type is eclogite with kyanite and zoisite Eclogite and picealite eclogite; the third type is a garnet-omphacite-quartz combination eclogite; the fourth type is (amphibole) garnet-pyroxene and related rocks (atypical Pluton ”). The symbiotic assemblages of metamorphic minerals and the evaluation of P-T conditions of these four types of eclogites show that they should belong to the product of high temperature and ultrahigh pressure-high pressure metamorphism, and their metamorphic PTt trajectories appear as clockwise Evolution trend, reflecting the subduction collision kinetic mechanism.