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Petrography and Petrogenesis of Pre-Mesozoic rocks, Ago-Iwoye NE, SW Nigeria
Abstract:
Detailed geological mapping was carried out in a part of Ago-Iwoye NE with a view to identify the rock types and determine their origin. Petrographic and whole rock analysis of seven rock samples collected during the initial mapping exercise was done through thin sectioning, and X-ray fluorescence. Minerals were studied in cross and plane polarized light; their contact angle and boundary interaction were inferred in thin section. Normative mineralogy of the rocks was also determined using CIPW Norm.
The study area is underlain by both igneous and metamorphic rocks; the gneisses are migmatized and intruded by granitic rocks and pegmatite. The dominant minerals in thin section include quartz, biotite, muscovite and hornblende. Estimated mineral contact angle is ~56° and ~26° for hornblende-biotite and hornblende-muscovite, respectively. Mineral grain boundaries are planar and undulating in thin section.
The geochemical study revealed major oxides such as SiO
Rocks of the study area are Pan African granitoids emplaced into the polycyclic Pre-Cambrian migmatized complex host rock.
DOI:
10.3809/jvirtex.2012.00313