DEPOSITIONAL ENVIROMENTS OF THE BIMA SANDSTONE OF THE YOLA ARM, BENUE TROUGH

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dc.contributor.authorNUHU., KADAI SAMAILA
dc.date.accessioned2014-02-06T14:18:37Z
dc.date.available2014-02-06T14:18:37Z
dc.date.issued2014-02-06
dc.descriptionA thesis submitted to the Postgraduate School, Ahmadu Bello University, in partial fulfillment of the requirements for the degree of Master of Science in Sedimentology Department of Geology, Faculty of Science, Ahmadu Bello University, Zaria, Nigeria. Marchen_US
dc.description.abstractThe Yola Arm of the Benue Trough is an elongate basin approximately 210km long, and average 70km in width,, It trends roughtly east-west, and was formed by sinistral displacements of inherited transcurrent faults during the Aptian-Albi an (Cretaceous)times. A study of the sedimentary structures and depositional motif of the Bima Sandstone, the oldest formation in the Yola Arm, suggest deposition in alluvial fans, 1acustrine/f1oodplain, and f1uvial environments were dominant. The alluvial fans consist of unstratified coarse-grained conglomerates on the southern margin, and parallel to cross-stratified fine grained conglomerates on the northern margin. The 1acustrine/f1oodplain depositional environment is characterised by silts and shales with wavy and lenticular bedding,mudcracks, and shale rip-up clasts. The f1uvia1 environment is characterized by planar and trough cross-bedded structures of unimodal vectors. Bynsedimentary deformation structures in the basin's axial deposits may suggest several tectonic causes, one which is penecontemporaneous seismic activity at the basin - margin faults. The Yola Arm is considered a pull-apart basin for the following reasons: (i)rapid facies changes from basin margin to basin margin, (ii) migration of depocenter causing over-lap of basement by the sediments, (iii) great thickness of deposits estimated at 4.6km from geophysical studies, (iv) complexity in sedimentary structures, and (v) evidence of strike-slip movementen_US
dc.identifier.urihttp://hdl.handle.net/123456789/531
dc.language.isoenen_US
dc.subjectDEPOSITIONAL,en_US
dc.subjectENVIROMENTS,en_US
dc.subjectBIMA SANDSTONE,en_US
dc.subjectYOLA ARM,en_US
dc.subjectBENUE TROUGHen_US
dc.titleDEPOSITIONAL ENVIROMENTS OF THE BIMA SANDSTONE OF THE YOLA ARM, BENUE TROUGHen_US
dc.typeThesisen_US
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