Volume 72, Issue 1, April 2024, Pages 49–64
Martial Pohn Koffi Adingra1, Koffi Yao Augustin2, Fossou Jean-Luc Hervé KOUADIO3, Likpia Ivanne Ange Theodora SIKELY4, and Yacouba Coulibaly5
1 Laboratory of Geology, Mineral and Energy Resources (LGRME), Training and research Unit and Earth Science and Mineral Resources, Félix Houphouët Boigny University, Abidjan, Côte d’Ivoire
2 Laboratoire de Géologie du socle et de Métallogénie, UFR STRM, Université Félix Houphouët Boigny de Cocody Abidjan, 22 BP 582 Abidjan 22, Côte d’Ivoire
3 Laboratory of Geology, Mineral and Energy Resources, Training and Research Unit in Earth Sciences and Mineral Resources, University Felix HOUPHOUËT-BOIGNY, Abidjan, Côte d’Ivoire
4 Laboratory of Geology, Mineral and Energy Resources, Training and Research Unit in Earth Sciences and Mineral Resources, University Felix HOUPHOUËT-BOIGNY, Abidjan, Côte d’Ivoire
5 Université Félix HOUPHOUET-BOIGNY, Laboratoire de Géologie des Ressources Minérales et Energétiques, UFR STRM, Abidjan, Côte d’Ivoire
Original language: English
Copyright © 2024 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The study area is located in the southeastern part of the Comoé basin (southeast of Côte d’Ivoire, north of the town of Alépé). The geology of this study area is marked by granitoids (two-mica bearing granites, granodiorites, microgranites and pegmatites) and metamorphic rocks (gneiss, micaschists, metawackes and schists) which are crossed by several quartz veins. The aim of this study is to identify the petro-structural and metallogenic features of the quartz veins in this part of the Ivorian birimian. The methodology used focused on geological surveys, petrographic descriptions (macroscopic and microscopic), structural analysis and metallogenic analyzed. The petro-structural study revealed the presence of saccharoid quartz veins, tourmaline bearing quartz veins, banded tourmaline quartz veins, biotite bearing quartz vein, translucent quartz veins, smoky quartz veins, white to milky white quartz vein. The morphology of the veins is variable: rectilinear or fusiform with a main NE-SW orientation and secondary orientations NNW-SSE and E-W. In addition, these veins are generally deformed in the form of folds, tension slots, sigmoidal figures. These structures demonstrate the existence of shear corridors. The presence of rolling extinction and quartz subgrains were highlighted by microscopic observations, confirming the dislocation creep mechanism. This mechanism indicates high temperature and differential stress conditions. Observations with metallographic microscopes coupled with geochemical analysis data show that sulphides and gold are present in the fracture planes and quartz subgrains and generally associated with the quartz-tourmaline veins. Hence, the interest in taking into account the quartz-tourmaline association in gold prospecting in the Birimian rocks.
Author Keywords: Gold, Tourmaline, Quartz veins, Subgrains, Côte d’Ivoire.
Martial Pohn Koffi Adingra1, Koffi Yao Augustin2, Fossou Jean-Luc Hervé KOUADIO3, Likpia Ivanne Ange Theodora SIKELY4, and Yacouba Coulibaly5
1 Laboratory of Geology, Mineral and Energy Resources (LGRME), Training and research Unit and Earth Science and Mineral Resources, Félix Houphouët Boigny University, Abidjan, Côte d’Ivoire
2 Laboratoire de Géologie du socle et de Métallogénie, UFR STRM, Université Félix Houphouët Boigny de Cocody Abidjan, 22 BP 582 Abidjan 22, Côte d’Ivoire
3 Laboratory of Geology, Mineral and Energy Resources, Training and Research Unit in Earth Sciences and Mineral Resources, University Felix HOUPHOUËT-BOIGNY, Abidjan, Côte d’Ivoire
4 Laboratory of Geology, Mineral and Energy Resources, Training and Research Unit in Earth Sciences and Mineral Resources, University Felix HOUPHOUËT-BOIGNY, Abidjan, Côte d’Ivoire
5 Université Félix HOUPHOUET-BOIGNY, Laboratoire de Géologie des Ressources Minérales et Energétiques, UFR STRM, Abidjan, Côte d’Ivoire
Original language: English
Copyright © 2024 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The study area is located in the southeastern part of the Comoé basin (southeast of Côte d’Ivoire, north of the town of Alépé). The geology of this study area is marked by granitoids (two-mica bearing granites, granodiorites, microgranites and pegmatites) and metamorphic rocks (gneiss, micaschists, metawackes and schists) which are crossed by several quartz veins. The aim of this study is to identify the petro-structural and metallogenic features of the quartz veins in this part of the Ivorian birimian. The methodology used focused on geological surveys, petrographic descriptions (macroscopic and microscopic), structural analysis and metallogenic analyzed. The petro-structural study revealed the presence of saccharoid quartz veins, tourmaline bearing quartz veins, banded tourmaline quartz veins, biotite bearing quartz vein, translucent quartz veins, smoky quartz veins, white to milky white quartz vein. The morphology of the veins is variable: rectilinear or fusiform with a main NE-SW orientation and secondary orientations NNW-SSE and E-W. In addition, these veins are generally deformed in the form of folds, tension slots, sigmoidal figures. These structures demonstrate the existence of shear corridors. The presence of rolling extinction and quartz subgrains were highlighted by microscopic observations, confirming the dislocation creep mechanism. This mechanism indicates high temperature and differential stress conditions. Observations with metallographic microscopes coupled with geochemical analysis data show that sulphides and gold are present in the fracture planes and quartz subgrains and generally associated with the quartz-tourmaline veins. Hence, the interest in taking into account the quartz-tourmaline association in gold prospecting in the Birimian rocks.
Author Keywords: Gold, Tourmaline, Quartz veins, Subgrains, Côte d’Ivoire.
How to Cite this Article
Martial Pohn Koffi Adingra, Koffi Yao Augustin, Fossou Jean-Luc Hervé KOUADIO, Likpia Ivanne Ange Theodora SIKELY, and Yacouba Coulibaly, “Geological features of quartz veins in the southeastern part of the Comoé Birimian basin (Southeast Cote d’Ivoire, North Alépé),” International Journal of Innovation and Scientific Research, vol. 72, no. 1, pp. 49–64, April 2024.
