Mineralogy Feature and Tectonic Significance of Garnet from Garnet-Mica Schist at the West Section of Xinyang-Shucheng Fault Belt

详细信息   

• 责任者：Ren Shenglian (School of Resources and Environmental Engineering ; Hefei University of Technology ; Hefei 230009 ; China) ; Song Chuanzhong
• 刊名：Chinese Journal of Geology
• 出版年：2011
• 卷期：46(2)
• 关键词：石榴子石族 ; garnet group ; 黑云母片岩 ; biotite schist ; 白云母片岩 ; muscovite schist ; 河南 ; Henan Province
• 页码：p.350-363
• 图表：6 illus., 4 tables, 43 refs.
• 分类号：0802
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

摘要

At the western part of the Xinyang-Shucheng fault of Tongbai Mountains, garnet porphyroblast in garnet-mica schist retained many deformation and metamorphic information during the process of rock formation.   Garnet microprobe analysis shows that it belongs to almandine, and reflects it had experienced mid-level regional metamorphism.  Compositional zoning of garnet shows that the rocks had experienced progressive metamorphism. First metamorphic environment was continuous temperature-pressure, and in mid-term there were two non-synchronous transient cooling and decompression process, and finally underwent decompression and warming process of the thermal relaxation environment, not subjected to significant retrograde metamorphism. Dislocations of garnet observed through TEM are mainly edge dislocations and dislocation walls.