摘要
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。
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.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2000年第2期140-151,184,共13页
Acta Petrologica et Mineralogica
基金
华北陆台早前寒武纪变质动力学及构造变形演化 "项目!(编号:85 0 2 2 0 5)
关键词
鲁东造山带
榴辉岩
动力学机制
变质作用
Ludong orogenic belt
eclogite
dynamic mechanism
division and collision of tectonic plate
