Petrographic and Geochemical Characteristics of the Pouni Palaeoproterozoic Formations North of the Léo Square Degree (Burkina Faso, West Africa)  

作　　者：Adama Ouédraogo Yaméogo Pascal Ouiya Hubert Gounwendmanaghré Zongo Omar Akonyiré Abraham Seydoux Traoré Saga Sawadogo Séta Naba Adama Ouédraogo Yaméogo;Pascal Ouiya;Hubert Gounwendmanaghré Zongo;Omar Akonyiré;Abraham Seydoux Traoré;Saga Sawadogo;Séta Naba(Unité de Formation et de Recherche en Sciences et Technologies, Département des Sciences de la Vie et de la Terre, Université Norbert Zongo, Koudougou, Burkina Faso;Unité de Formation et de Recherche en Sciences de la Vie et de la Terre, Laboratoire Géosciences et Environnement (LaGE), Département des Sciences de la Terre, Université Joseph Ki-Zerbo, Ouaga, Burkina Faso;Ecole Normale Supérieure (ENS), Institut des Sciences et de Technologie (IST), Ouaga, Burkina Faso;Ecole Supérieure d’Ingénieries, Université de Fada N’gourma, Fada N’Gourma, Burkina Faso)

机构地区：[1]Unité de Formation et de Recherche en Sciences et Technologies, Département des Sciences de la Vie et de la Terre, Université Norbert Zongo, Koudougou, Burkina Faso [2]Unité de Formation et de Recherche en Sciences de la Vie et de la Terre, Laboratoire Géosciences et Environnement (LaGE), Département des Sciences de la Terre, Université Joseph Ki-Zerbo, Ouaga, Burkina Faso [3]Ecole Normale Supérieure (ENS), Institut des Sciences et de Technologie (IST), Ouaga, Burkina Faso [4]Ecole Supérieure d’Ingénieries, Université de Fada N’gourma, Fada N’Gourma, Burkina Faso

出　　处：《Open Journal of Geology》2024年第1期126-141,共16页地质学期刊（英文）

摘　　要：The Pouni area is made up of basalts belonging to the Boromo belt, lamprophyres and granitoids. These geological formations are similar to geological formations of the same type in other regions of the Palaeoproterozoic domain of the Man/Leo shield. This study, which focused on the petrographic and geochemical characteristics of these geological formations, led to the following main conclusions: The lamprophyres are basic plutonic rocks that cut through other geological formations. The basalt belongs to the northern part of the Borormo belt and is thought to be a relic of overthickened oceanic plateaus. There are two groups of granitoid rocks. The granodiorite has a geochemical signature close to that of Archean TTGs and is metaluminous in character. It has a low potassium content. The minor element and rare earth element spectra indicate that it could be derived from partial melting of basic magmatic rocks. Biotite granites are peraluminous and highly potassic. Minor element contents and rare earth spectra indicate that they could be derived from partial melting of felsic materials. Geotectonic diagrams show that the granitoids identified in the Pouni zone were emplaced in an active tectonic context, similar to that of present-day subduction zones.The Pouni area is made up of basalts belonging to the Boromo belt, lamprophyres and granitoids. These geological formations are similar to geological formations of the same type in other regions of the Palaeoproterozoic domain of the Man/Leo shield. This study, which focused on the petrographic and geochemical characteristics of these geological formations, led to the following main conclusions: The lamprophyres are basic plutonic rocks that cut through other geological formations. The basalt belongs to the northern part of the Borormo belt and is thought to be a relic of overthickened oceanic plateaus. There are two groups of granitoid rocks. The granodiorite has a geochemical signature close to that of Archean TTGs and is metaluminous in character. It has a low potassium content. The minor element and rare earth element spectra indicate that it could be derived from partial melting of basic magmatic rocks. Biotite granites are peraluminous and highly potassic. Minor element contents and rare earth spectra indicate that they could be derived from partial melting of felsic materials. Geotectonic diagrams show that the granitoids identified in the Pouni zone were emplaced in an active tectonic context, similar to that of present-day subduction zones.

关 键 词：Burkina Faso Dori Man/Léo Shield PETROGRAPHY Geochemistry Partial Melting Geotectonic Context 

分 类 号：P58[天文地球—岩石学]