大别山超高压变质带表壳岩地球化学特征及启示  

THE GEOCHEMICAL CHARACTERISTICS OF ULTRAHIGH PRESSURE METAMORPHIC CRUSTOSE IN THE DABIE MTS AND THE IMPLICATIONS

作　　者：钱存超[1] 路玉林[1] 贾十军[1] 

机构地区：[1]安徽地质调查院

出　　处：《安徽地质》1998年第3期3-11,共9页Geology of Anhui

摘　　要：大别山南部出露较多的变质表壳岩，主要由片麻岩、片岩、长英质粒状岩石、大理岩、斜长角闪岩类等组成，经历了超高压、高压变质作用。通过岩石学、岩石化学、地球化学的研究，对其形成时代、原岩建造、构造背景等作了较深入的分析，认为其成岩时代可能属于早中元古代，原岩为一套碎屑岩，碳酸盐岩夹火山岩建造，构造背景应为与大陆岛弧有关的活动大陆边缘环境。这些研究成果为探讨大别造山带的形成环境、演化、榴辉岩等超高压变质带的形成、折返机制等提供了较充分的地质依据。The outcropped metamorphic crustoses in the southern Dabie Mts which have been subjected to ultrahigh-high pressure metamorphism consist of gneiss,schist,felsic granular rock,marble,plagioclase amphibolite,etc Their diagenesis is thought to have taken place in the early-to mid-Proterozoic time and the protoliths are a suite of detrital rocks and carbonate rocks intercalated with volcanic formation. Their tectonic setting should be the active continental margin related to continental island arc All these are helpful to the discussion on the eclogite and even the ultrahigh pressure metamorphic belt and exhumation mechanism

关 键 词：变质表壳岩 岩石地球化学 岛弧活动 大陆边缘 大别山 

分 类 号：P588.34[天文地球—岩石学] P588.34[天文地球—地质学]