A Study of Metamorphism of Metapelites from the Kuanping Group, Northern Tongbai

• 责任者：Hu Juan (Institute of Geomechanics ; Chinese Academy of Geological Sciences ; Beijing 100081 ; China) ; Liu Xiaochun
• 刊名：Earth Science Frontiers
• 出版年：2010
• 卷期：17（1)
• 关键词：变泥质岩 ; metapelite ; 变质作用 ; metamorphism ; 大别山 ; Dabie Mountains
• 页码：p.104-113
• 图表：4 illus., 2 tables, 26 refs.
• 分类号：0802
• issnNo：ISSN1005-2321
• isbnNo：CN11-3370/P

In this paper, the authors report petrological results on four garnet-bearing metapelites from this group, including a staurolite-kyanite-bearing sample collected from the Huilongsi Formation, and a sillimanite-bearing sample taken from the Zuolaozhuang Formation.  Garnet from samples in the Huilongsi Formation exhibits a pronounced compositional zoning that resulted from progressive metamorphism, whereas that from samples in the Zuolaozhuang Formation is weakly affected by late low-temperature diffusion. The close association of lower-upper amphibolite facies Kuanping Group, lower amphibolite facies Erlangping Group and granulite facies Qinling Group with similar metamorphic ages (440～400 Ma) suggests that collisional orogenesis occurred between arc, microcontinent and southern margin of the North China craton during the Silurian to the Early Devonian.