American Journal of Geophysics, Geochemistry and Geosystems
Articles Information
American Journal of Geophysics, Geochemistry and Geosystems, Vol.2, No.2, Apr. 2016, Pub. Date: Jul. 15, 2016
Structural Framework and Petrology of the Sedimentary Rocks in Parts of the Western Flank of Ikom – Mamfe Basin, Southeastern Nigeria
Pages: 15-22 Views: 2054 Downloads: 1158
Authors
[01] Efosa Udinmwen, Department of Geology, University of Calabar, Calabar, Nigeria.
Abstract
The study area is part of the western flank of the Ikom – Mamfe basin and contains sedimentary rocks which are made up of basically sandstones with minor mudstone, limestone and shale. Thin section analysis show that the sandstones are probably lithic sub-arkosic sandstone with a parent material most likely of igneous or metamorphic origin. The limestone and mudstone occur as thin beds within sandstone and the shales are baked in some cases. Sediments in the study area were probably deposited in high and low energy environments characterized by shallow and deep marine transgression events which led to the deposition of limestone and black shale respectively. The bedding planes in the sedimentary rocks dips gently and are cut by fractures oriented in the NW – SE/ESE – WNW, NNW – SSE, ENE – WSW and NNE – SSW directions. The fracture characteristics support the occurrence of two episodes of deformation in this basin.
Keywords
Ikom – Mamfe Basin, Fracture, Sandstone, Limestone, Shale
References
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