Morphological Studies and Petrogenetic Relationship of Metatexite Cum Diatexite Migmatites Around Buzaye Area, Bauchi, Nigeria

Yıl 2022, Cilt: 4 Sayı: 3, 380 - 394, 30.12.2022

Sadiq Mohammed Salısu Ahmed Isah Haruna Maimunatu Halılu Faisal Abdullahı Tahir Garba Ahmad

Öz

The geology and petrogenetic studies of migmatites around Buzaye area were conducted to evaluate their morphological units and geochemical affinity. Field mapping revealed migmatite with stromatic structures represented the metatexite while parts of the migmatite with schollen and schlieren structures with granitic component represent the diatexite. Fourteen rock samples from different outcrops were cut and examined for geochemical analyses for their major and trace element using XRF pressed pellet technique. Geochemically, diatexite migmatites samples show SiO2 content from 68.40wt.% to 82.06 wt.% while samples collected from the metatexites has shown silica content as low as 56.42 wt.%. Variation diagrams show negative correlation between MgO, CaO, TiO2, FeO2 and Al2O3 with SiO2 but positive correlation with Na2O and K2O indicating the normal magma crystallization trends. Based on the major and trace element data, the migmatites in the study area were classified into peraluminous, theolitic and S–type granitoids. On primitive mantle-normalized spider diagrams, all samples show marked negative anomalies in Yb, P and Ti which are similar to that commonly observed in High-K magmas generated along sub-duction zone. Tectonically, the plutons are classified as volcanic arc or subduction related and are late orogenic to post orogenic with respect to the Pan-African Orogeny.

Anahtar Kelimeler

Migmatites, Buzaye, Diatexite, Schlieren, Stromatic, Pan-African Orogeny

Kaynakça

• Attoh, K., 1998. High-pressure granulite facies metamorphism in the Pan-African Dahomeide orogen, West Africa. Journal of Geology 106, 236-246.
• Batchelor, R.A., Bowden, P., 1985. Petrogenetic interpretation of granitoid rock series using multi cationic parameters. Chemical Geology 48, 43-55.
• Black, R., Liegeois, J.P., 1993. Cratons, mobile belts, alkaline rocks and continental lithospheric mantle: The Pan-African testimony. Journal of the Geological Society 150, 89-98.
• Black, R., Latouche, L., Liegeois, J.P., Caby, R., Bertrand, J.M., 1994. Pan-African displaced terranes in the Tuareg shield (central Sahara). Geology 22, 641-644.
• Brown, M., 1973. The definition of metatexites, diatexites and migmatites. Proceedings of the Geologists' Association 84, 371-82.
• Caby, R., 1989. Precambrian terranes of Benin–Nigeria and Northeast Brazil and the Late Proterozoic South Atlantic fit. Geological Society of America Special Paper 230, 145-158.
• Caby, R., 1994. Precambrian coesite from northern Mali: first record and implications for plate tectonics in the trans Saharan segment of the Pan-African belt. European Journal of Mineralogy 6, 235-244.
• Caby, R., 2003. Terrane assembly and geodynamic evolution of Central–Western Hoggar: a synthesis. Journal of African Earth Sciences 37, 133-159.
• Castaing, C., Triboulet, C., Feybesse, J.L., Chèvremont, P., 1993. Tectonometamorphic evolution of Ghana, Togo and Benin in the light of the Pan-African/Brasiliano orogeny. Tectonophysics 218, 323-342.
• Cox, K.G., Bell, J.D., Pankhurst, R.J., 1979. The interpretation of igneous rocks; George Allen and Unwin, London, 450p.
• Dada, S.S., Respaut, J.P., 1989. La monzonite à fayalite de Bauchi (bauchite), nouveau témoin d’un magmatisme syntectonique panafricain au nord du Nigéria. Comptes Rendus de l’Académie des Sciences de Paris 309, 887-892.
• Dada, S.S., Lancelot, J.R., Briqueu, L., 1989. Age and origin of the annular charnockitic complex at Toro, Northern Nigeria: U–Pb and Rb–Sr evidence. Journal of African Earth Sciences 9, 227-234.
• Dada, S., Birck, J.L., Lancelot, J.R., Rahaman, M.A., 1993. Archean migmatite–gneiss complex of North Central Nigeria: its geochemistry, petrogenesis and crustal evolution. International Colloquium on African Geology, Mbabane, Swaziland, 97-102.
• Dada, S.S., 1998. Crust-forming ages and proterozoic crustal evolution in Nigeria: a reappraisal of current interpretations. Precambrian Research 87, 65-74.
• Djouadi, M.T., Gleizes, G., Ferré, E., Bouchez, J.L., Caby, R., Lesquer, A., 1997. Oblique magmatic structures of two epizonal plutons, Hoggar, Algeria: late-orogenic emplacement in a transcurrent orogen. Tectonophysics 279, 351-374.
• Ferre, E.C., Caby, R., Peucat, J.J, Capdevila, R., Monie, P., 1998. Pan-African, post-collisional, ferro-potassic granite and quartz–monzonite plutons of Eastern Nigeria. Lithos 45, 255-279.
• Ferre, E.C., Gleizes, G., Caby, R., 2002. Tectonics and post-collisional granite emplacement in an obliquely convergent orogen: The Trans-Saharan belt, Eastern Nigeria. Precambrian Research 114, 199-219.
• Ferre, C.E., Caby, R., 2006. Granulite Facies Metamorphism and Charnockite plutonism: Examples from the Neoproterozoic Belt of Northern Nigeria. Journal of Geology 100/06006.
• Frost, B.R., Calving, G.B., William, J.C., Richard, J.A., David, J.E., Carrol, D.F. 2001. A geochemical classification for granitic rocks. Journal of Petrology 42 (11), 2033-48.
• Garrels, R.M., Mackenzie, F., 1971. Evolution of sedimentary Rock, Norton and Co: New York 394 pp. Irvine, T.N., Baragar, W.R.A., 1971. A guide to the chemical classification of the common volcanic rocks. Canadian Journal of Earth Sciences8, 523-548.
• Jahn, B., Caby, R., Monié, P., 2001. Precambrian UHP eclogites from northern Mali, West Africa: age of UHP metamorphism, nature of protoliths and tectonic implications. Chemical Geology (Isotope Geoscience Section) 178, 143-158.
• Liégeois, J.P., Black, R., Navez, J., Latouche, L., 1994. Early and late Pan-African orogenies in the Aïr assembly of terranes (Tuareg shield, Niger). Precambrian Research 67, 59-88.
• Middlemost, E.A.K., 1994. Naming materials in the magma/igneous rock system. Earth-Science Reviews 37, 215-224.
• Pearce, J.A., Harris, N.B.W., Tindle, A.G., 1984.Trace element Discrimination Diagrams for the Tectonic Interpretation of Granitic Rocks. Journal of Petrology 25 (4), 956-983.
• Peccerillo, A., Taylor S.R., 1976.Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey. Contrib Mineral Petrol 58: 63-81.
• Sawyer, E.W., 2008. Working with Migmatites. Mineralogical Association of Canada Short Course Series, 38.
• Shearer, C.K.., Papike, J.J., Laul, J.C., 1985. Chemistry of Potassium Feldspars from Three Zoned Pegmatites, Black, Hills, South Dakota: Implication Concerning Pegmatite Evolution. Geochemica et Cosmochimica Acta 49, 663-673.
• Tarney, J., 1977. Petrology, mineralogy and geochemistry of the Falkland Plateau basement rocks, Site 30, deep sea drilling project. Initial Report, Vol. 36, 893-920.
• Taylor, S.R., McLennan, S.M., 1985. The Continental Crust: its composition and evolution. Oxford: Blackwell.
• Willaseca, C., Barbero, L., Herreros, V., 1998. A re-examination of the typology of peraluminous granite types in intra continental orogenic belts. Transactions of the Royal Society of Edinburgh, Earth Sciences 89, 113-119.
• Wright, E.P., 1971. Basement Complex. In (Geological Survey of Nigeria; ed.). The geology of the Jos Plateau. Geological Survey of Nigeria, Place, 12-47.