DEFORMATION MECHANISMS, TIMING AND SHEAR SENSE ANALYSIS OF PART OF THE PRECAMBRIAN TERRAIN OF SOUTHWESTERN NIGERIA
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Date
2019-01-01
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university of el oued/جامعة الوادي
Abstract
The study area is part of the polycyclic Precambrian Basement Complex of southwestern
Nigeria, which comprises meta-sediments and granitoids of varying compositions. The area
was primarily deformed into a large-scale sheeted structure, which was sequentially followed
by developments of first and second phases of folding that interfered with each other. Brittle
to semi-ductile shear deformations, initiated by an ESE-directed transport of the hanging wall
of a major NE-SW trending low-angle normal fault culminated in the third phase of fold and
development of widespread shear zones. Latter phases of deformation resulted in rotation of
finite strain axis relative to the instantaneous strain during a non-coaxial progressive simple
shear deformation. We posit that the dominant terminal mechanism of deformation in the area
is the late-kinematic progressive heterogeneous simple shear during the late- to post-Pan
African orogenesis.
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Keywords
Shear; deformation; tectonic; poikiloblast; rotation; isoclines
Citation
A. D. Adedoyin, E. P. Ebiri, M. T. Alebiosu,DEFORMATION MECHANISMS, TIMING AND SHEAR SENSE ANALYSIS OF PART OF THE PRECAMBRIAN TERRAIN OF SOUTHWESTERN NIGERIA .Journal of Fundamental and Applied Sciences.VOL11 N01.01/01/2019.university of el oued [visited in ../../….]. available from [copy the link here]