| Brittle deformation in the Afikpo Basin （Southeast Nigeria）： Evidence for a terminal Cretaceous extensional regime in the Lower Benue Trough, Nigeria |
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| 作者单位： | Department of Geology, University of Port Harcourt, Port Harcourt, Nigeria |
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| 摘 要： |
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| 关 键 词： | 白垩纪末期 伸展变形 尼日利亚 盆地 海槽 脆性变形 菲 证据 |
Brittle deformation in the Afikpo Basin (Southeast Nigeria): Evidence for a terminal Cretaceous extensional regime in the Lower Benue Trough,Nigeria |
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| Authors: | MI Odigi Levi C Amajor |
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| Institution: | Department of Geology, University of Port Harcourt, Port Harcourt, Nigeria |
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| Abstract: | This paper deals with the regional and structural framework of the Cretaceous rocks in the Afikpo Basin located in the southeastern
part of the Lower Benue Trough. Results from regional tectonics are presented together with those of the microtectonic analysis
of microfaults in the Owutu-Afikpo-Adadama area in the basin.
The Owutu-Afikpo-Adadama ridge at the north-central part of the basin marks the boundary between the Late Cenomanian-Turonian-Conianian
sediments and the Campanian-Maastrichtian sandstones. This ridge trends N45°E on average and is faulted in three main directions,
namely: (1) N-S normal faults; (2) NE-SW strike-slip faults; and (3) NW-SE strike-slip faults. The faulted rocks along these
brittle discontinuities are mainly cataclastics with internal fracture cleavage and sigmoidal quartz mosaics that are reminiscent
of extensional deformation. The cataclasites often bear slickenside striations. |
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| Keywords: | brittle deformation Afikpo Basin (Southeast Nigeria) Cretaceous extensional regime Lower Benue Trough Nigeria |
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