Petrologic and Structural Features of Basement Rocks of Parts of Mukuru Area, Southeastern Nigeria
Volume 2, Issue 4, August 2013, Pages: 96-103
Received: Jul. 10, 2013;
Published: Aug. 10, 2013
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Ndukauba Egesi, Department of Geology, University of Port Harcourt, Port Harcourt, Nigeria
Victor U. Ukaegbu, Department of Geology, University of Port Harcourt, Port Harcourt, Nigeria
Field investigations in the western part of Mukuru area indicate intense structural imprints and high HT/HP metamorphism, and some magmatism. The rock units in the area include migmatitic gneisses, granulites, amphibolites, schists, charnockites, epidiorites and granites. The charnockites which are common in the shear zone and boundary areas appear to mark the end of magmatism. However, relicts of magmatic rocks mapped at Ubong Community in the study area suggest earlier magmatism. The metamorphic rocks are strongly deformed in a N-S to NE-SW direction with ghost structures, pinch and swell structures, ptygmatic veins, showing evidence of extensional tectonics. No visible contact relationship between the migmatitic gneisses and schists was observed. Diagnostic metamorphic structures like fine banding/layering of alternating dark- and light-coloured layers are conspicuous in gneisses and some amphibolites while schistosity and deep weathering are present in schists. The geodynamic features prevalent in Mukuru area are deformation and metamorphism. They indicate a possible petrogenetic link to southern Obudu Plateau in the north, western Cameroon in the east than Bansara in the west.
Victor U. Ukaegbu,
Petrologic and Structural Features of Basement Rocks of Parts of Mukuru Area, Southeastern Nigeria, Earth Sciences.
Vol. 2, No. 4,
2013, pp. 96-103.
Edet A. E., Teme, S. S., Okereke, C. S., Esu, E. O., 1994. Lineament analysis for groundwater exploration in Precambrian Oban Massif and Obudu Plateau, SE Nigeria. Journal of Mining Geology Vol. 30, No. 1, pp. 87 – 95.
Egesi, N. and Ukaegbu, V. U., 2010a. Trace and Rare Earth Element Geochemical Fingerprints on the Petrogenesis and Geotectonics of the Enderbite-Adamellite-Granite Complex in parts of Bansara (Sheet 304 NE and SE), SE, Nigeria. The IUP J. of Earth Sciences Vol. 4 No.2:7-25 www.iupindia.org
Egesi, N. and Ukaegbu, V. U., 2010b. Petrologic and Structural Characteristics of the Basement Units of Bansara Area, southeastern Nigeria. Pacific Journal of Science and Technology (PJST) 11(1):510 – 525. http://www.akamaiuniversity.us/PJST11_1_510.pd
Egesi, N. and Ukaegbu, V. U., 2011. Petrology and Major Element Geochemistry of Late to Post Neoproterozoic Peraluminous Granitoids in parts of Bansara Southeastern Nigeria. The IUP J. of Earth Sciences Vol. 5 No. 3: 7-19 www.iupindia.org
Ekwueme, B. N., 1987. Structural Orientations and Precambrian Deformational Episodes of Uwet Area, Oban massif SE Nigeria. Precambrian Res. 34: 269-289.
Ekwueme, B. N., 1994. Structural features of southern Obudu Plateau, Bamenda massif, SE Nigeria: Preliminary interpretations. Journ. Mining Geol. Vol. 30. No. 1 pp. 45 – 59.
Goggle Earth 2011. Remote sensing map of study area with the prominent Cameroon Volcanic Line in NE-SW.
Grant, N. K., 1978. Structural distinction between a sedimentary cover and underlying basement in 600Mya Pan-africa domain of North-western Nigeria, West Africa. Geo. Soc. Am. Bull. 89, 50 – 58.
Orajaka, S., 1964. Geology of the Obudu area, Ogoja province, Eastern Nigeria. Le Naturaliste Canadian, Vol. XCL, No. 3, pp. 72 – 86.
Okeke, P.O., 1995. A handbook Metamorphic Geochemistry. Dulacs Press Enugu p.128
Rahaman, M. A., 1976. Progressive Polyphase metamorphism in pelitic schist around Aiyetoro, Oyo State, Nigeria. Nig. Journ. Min. Geol. Vol. 13, No. 2, pp. 33 – 44.
Toteu, S. F., Penaye, J., and Djomani, Y.P., 2004. Geodynamic Evolution of pan-African Belt in Central Africa with Special Reference to Cameroon. Can. J. Earth Sci. 41: 73-85.
Ukaegbu, V. U., 2003. The Petrology and Geochemistry of parts of southern Obudu Plateau, Bamenda Massif southeastern Nigeria. Unpubl. Ph.D. Dissertation. Univ. of Port Harcourt, Nigeria p.321
Ukaegbu, V. U. and Oti, M. N., 2005. Structural elements of the Pan-African Orogeny and their geodynamic implications in Obudu Plateau,southeastern Nigeria. [J]. Journ. Min. Geol. 41, 41 – 49.