Genesis of Clastic Dykes and Soft-Sediment Deformation Structures in the Mamfe Basin, South-West Region, Cameroon: Field Geology Approach

This paper aims to investigate the genesis of clastic dykes and soft-sediment deformation structures in the Mamfe Basin, South West-Region, Cameroon. Results from this study portray the following: (1) The clastic dykes are extrusive and were generated from preexisting soft-sediments that penetrate f...

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Bibliographic Details
Published in:Journal of Geological Research 2018-01, Vol.2018, p.1-8
Main Authors: Ekoko Eric, Bokanda, Emile, Ekomane, John Takem, Eyong, Isaac Konfor, Njilah, Ethel Nkongho, Ashukem, Rita Ndige, Bisong, Salomon Bertrant, Bisse
Format: Article
Language:English
Subjects:
Basins
Casts
Cretaceous
Deformation
Deformation mechanisms
Fault lines
Faults
Fluidization
Fluidizing
Folds
Fractures
Geology
Grain size
Gravitation
Gravity
Hydrochloric acid
Joints
Liquefaction
Plate tectonics
Precambrian
Rifting
Rock intrusions
Sediment load
Sedimentary geology
Sedimentation
Sediments
Seismic activity
Shock loads
Structures
Volcanic activity
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Summary:This paper aims to investigate the genesis of clastic dykes and soft-sediment deformation structures in the Mamfe Basin, South West-Region, Cameroon. Results from this study portray the following: (1) The clastic dykes are extrusive and were generated from preexisting soft-sediments that penetrate fissures caused by seismic activity. It can be concluded that clastic dykes originate from seismic shacking, probably induced by volcanic-tectonic activity and magmatic dykes that cut across the Precambrian and Cretaceous formations of the Mamfe Basin. (2) The soft-sediment deformation structures (flexures, sheared foliations, anticlinal folds, load casts, and flame structures) are likely triggered by seismic shocks. The inferred influence of seismic activity results from rifting and rapid subsidence of basin-fill during the Cretaceous. Some of these soft-sediment deformation structures (SSDS) are induced by fluidization and liquefaction triggered by rapid sedimentation within tectonically active settings, as well as density variations illustrated by local occurrence of load casts with weak lateral extensions. (3) The synsedimentary features (joints, faults, filled fractures) are related to local stress triggered by gravitational sliding, because the fractures were filled by unconsolidated clastic materials.
ISSN:1687-8833
1687-8841
DOI:10.1155/2018/3749725