Petro-Structural Study of Paragneiss in the SASCA Domain(GbowéSector at Grand-Bereby),Southwestern Cote d’Ivoire  

作　　者：Fossou Jean-Luc Hervé Kouadio Mamadou Sangare N’Guessan Nestor Houssou Marc Ephrem Allialy Sagbrou Chérubin Djro 

机构地区：[1]Laboratory of Geology,Mineral and Energy Resources(LGRME),Faculty of Earth Science and Mineral Resources,Félix Houphouet Boigny University,Abidjan,Cote d’Ivoire

出　　处：《Journal of Geoscience and Environment Protection》2020年第5期1-16,共16页地球科学和环境保护期刊（英文）

摘　　要：The petrographic and structural study of Gbowé (Grand-Béréby) formations located in the SASCA domain (South-West of C&#244te d’Ivoire) revealed migmatitic paragneisses. For an in-depth understanding of the petrographic, structural and metamorphic characteristics, six (6) thin sections were made from these paragneisses. These gneisses are characterized by paleosomes and neosomes (leucosome and melanosome), consisting of quartz, garnet, plagioclase, biotite, cordierite, sillimanite, myrmekite and microcline. The mineralogical assemblage thus described indicates a retrograde metamorphism (transition from granulitic facies to amphibolitic facies). The structural and microstructural study identified two types of deformation (ductile and brittle). The ductile deformation is characterized by phases D1 (NE-SW flattening) and D2 (NW-SE flattening), materialized by foliations (N140&#730, N050&#730), folds (asymmetrical folds, similar folds, concentric folds, ptymatic folds) and boudins. Fracture schistosity and fold fracture schistosity are characteristic of the brittle deformation (phase D3). The microstructural study coupled with the metamorphic study shows that the deformations had an impact on the texture of the minerals (recrystallization and mineral reactions). It also allowed giving the paragenesis of phases D1 and D2. The D1 phase is characterized by garnet1, biotite1, quartz1, sillimanite1 and cordierite1 and the D2 phase is characterized by garnet1, quartz2, sillimanite2, biotite2, garnet2 and orthose2. These parageneses thus highlighted bear witness to a polydeformation and polymorphism that affects the study area.The petrographic and structural study of Gbowé (Grand-Béréby) formations located in the SASCA domain (South-West of C&#244te d’Ivoire) revealed migmatitic paragneisses. For an in-depth understanding of the petrographic, structural and metamorphic characteristics, six (6) thin sections were made from these paragneisses. These gneisses are characterized by paleosomes and neosomes (leucosome and melanosome), consisting of quartz, garnet, plagioclase, biotite, cordierite, sillimanite, myrmekite and microcline. The mineralogical assemblage thus described indicates a retrograde metamorphism (transition from granulitic facies to amphibolitic facies). The structural and microstructural study identified two types of deformation (ductile and brittle). The ductile deformation is characterized by phases D1 (NE-SW flattening) and D2 (NW-SE flattening), materialized by foliations (N140&#730, N050&#730), folds (asymmetrical folds, similar folds, concentric folds, ptymatic folds) and boudins. Fracture schistosity and fold fracture schistosity are characteristic of the brittle deformation (phase D3). The microstructural study coupled with the metamorphic study shows that the deformations had an impact on the texture of the minerals (recrystallization and mineral reactions). It also allowed giving the paragenesis of phases D1 and D2. The D1 phase is characterized by garnet1, biotite1, quartz1, sillimanite1 and cordierite1 and the D2 phase is characterized by garnet1, quartz2, sillimanite2, biotite2, garnet2 and orthose2. These parageneses thus highlighted bear witness to a polydeformation and polymorphism that affects the study area.

关 键 词：PETROGRAPHY Structural Migmatitic Paragneiss Retrograde Metamorphism Gbowé SASCA Domain C?te d’Ivoire 

分 类 号：P58[天文地球—岩石学]