TY - JOUR
T1 - Main structural lineaments of the southern Cameroon volcanic line derived from aeromagnetic data
AU - Kemgang Ghomsi, Franck Eitel
AU - Kana, Janvier Domra
AU - Aretouyap, Zakari
AU - Ribeiro-Filho, Nelson
AU - Pham, Luan Thanh
AU - Baldez, Raissa
AU - Tenzer, Robert
AU - Mandal, Animesh
AU - Nzeuga, Alain
N1 - Funding Information:
The authors are grateful to the Editors, Prof. Harald G. Dill and Prof. Mapeo, and the two anonymous reviewers for their helpful reviews of the initial manuscript, which really helped us a lot to improve the quality of our article. Crameri (2018b) color maps were employed, ensuring that the underlying data in the figures was accurately represented. Figures were generated in this manuscript using PyGMT (Wessel et al. 2019).
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2022/2
Y1 - 2022/2
N2 - The Cameroon Volcanic Line (CVL) is an African-only active alkaline intraplate feature that ranges in age from Oligocene to recent, with volcanoes crossing the oceanic-continental boundary. Because of its Cenozoic tectonic processes and magmatic features associated to seismic and volcanic activity, studies of the CVL geodynamic are of great importance. Despite its shear zone features, detailed structural geophysical studies of the southern CVL remain elusive. In this work, we use high-resolution airborne magnetic data to reveal geophysical signatures of the CVL. We apply a combination of derivative and phased filters and an improved cross-correlation approach to delineate geological structures of the southern CVL and propose an interpretation from aeromagnetic data. Derivative and phased filters highlight three distinct magnetic domains, with high positive and negative amplitudes. Rata Mount and Rumpi Hills, for example, show a NE-SE trend and a high magnetic amplitude. This finding might be explained by different types of rocks, consisting of the Upper Cretaceous basalt and sandstone sequences. The intensity of the enhanced horizontal gradient amplitude (EHGA) is well associated with geological features and its effects on a topographic relief. From the cross-correlation analysis, we successfully obtained the magnetization direction of a few specific anomalies.
AB - The Cameroon Volcanic Line (CVL) is an African-only active alkaline intraplate feature that ranges in age from Oligocene to recent, with volcanoes crossing the oceanic-continental boundary. Because of its Cenozoic tectonic processes and magmatic features associated to seismic and volcanic activity, studies of the CVL geodynamic are of great importance. Despite its shear zone features, detailed structural geophysical studies of the southern CVL remain elusive. In this work, we use high-resolution airborne magnetic data to reveal geophysical signatures of the CVL. We apply a combination of derivative and phased filters and an improved cross-correlation approach to delineate geological structures of the southern CVL and propose an interpretation from aeromagnetic data. Derivative and phased filters highlight three distinct magnetic domains, with high positive and negative amplitudes. Rata Mount and Rumpi Hills, for example, show a NE-SE trend and a high magnetic amplitude. This finding might be explained by different types of rocks, consisting of the Upper Cretaceous basalt and sandstone sequences. The intensity of the enhanced horizontal gradient amplitude (EHGA) is well associated with geological features and its effects on a topographic relief. From the cross-correlation analysis, we successfully obtained the magnetization direction of a few specific anomalies.
KW - Cameroon volcanic Line
KW - Cross-correlation
KW - Edge enhancement
KW - Magnetization direction
KW - Potential field data
UR - http://www.scopus.com/inward/record.url?scp=85119970269&partnerID=8YFLogxK
U2 - 10.1016/j.jafrearsci.2021.104418
DO - 10.1016/j.jafrearsci.2021.104418
M3 - Journal article
AN - SCOPUS:85119970269
SN - 1464-343X
VL - 186
JO - Journal of African Earth Sciences
JF - Journal of African Earth Sciences
M1 - 104418
ER -