RMZ â MATERIALI IN GEOOKOLJE

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356 Akinola, O. O., Talabi, A. O.In pegmatite, the feldspars exist asporphyries of microcline with its characteristicstrong cross hatched twiningand strong to weak micro perthitic intergrowth.Tourmaline crystals exhibitlong needle-like prismatic shapes withacicular habit (Figure 7).Modal analysis (Table 1) shows thatquartz is adequately represented inmost of the basement rocks withquartzite, granite, gneisses and pegmatiteshowing larger percentages whileepidiorite, amphibole schist and calcgneissrecord substantially low values.Plagioclase is well represented ingranite, pegmatite and the gneisses butwith low representation in the schistoserocks. Biotite is another mineralthat cut across most of the basementrocks. However, highest percentagesare recorded in biotite schist and biotitegneiss while calc-gneiss does notshow any trace of the mineral at all. Asregards amphibole schist, hornblendehas the highest percentage while it is ofan average value in epidiorite. Olivineand pyroxene are only represented inepidiorite while tourmaline and lepidoliteare present only in pegmatite.Results and discussionGeochemical featuresGeochemical result (Table 2) showsthat average SiO 2content of all thebasement rocks are high and rangefrom lowest value in epidiorite (55.72%) to highest value in granite (73.61%). The gneisses have average SiO 2similar to those found around Ileshaarea (Elueze, 1981). Alumina contentranges from lowest in calc-gneiss(9.23 %) to higher values in amphiboleschist (15.62 %) and highest in biotiteschist (18.03 %). The mean Al 2O 3contentof the schistose rock around Ijerois generally higher than similar rocksencountered around Ibadan (Okunlolaet al, 2009)Mean Fe 2O 3content of Epidiorite(11.16 %)) and biotite schist (8.53)are comparable. These values arehigher than biotite gneiss (7.02 %) andpegmatite (6.49 %). Low mean MnOvalue is common to all the basementrocks except quartzite (2.18 %) whichrecords the highest, and this valueis higher than calc-gneiss (1.64 %).All other basement rocks have averageMnO values that are less than 0.6%, for instance, epidiorite and biotiteschist both record 0.08 %. Mean MgOcontent of Calc-gneiss (13.49 %) isslightly lower than epidiorite (14.80%). Other rocks, amphibole schist(6.25 %), biotite gneiss (3.08 %), biotiteschist (8.94 %), quartzite (1.00 %)have low mean values while the remainingbasement rocks record lowervalues. Average CaO values of migmatitegneiss (2.51 %), biotite gneiss(2.14 %) and amphibole schist (2.04%) are comparable. However, these<strong>RMZ</strong>-M&G 2012, 59
Petrochemical characteristics and geotechnical properties of crystalline rocks in the ...357Figure 7. Photomicrograph of pegmatite in transmitted light showing tourmaline crystals(T), Quartz (Q) and muscovite (M).Table 1. Modal composition of the basement rocks in Ijero-Ekiti area (%)Minerals *MG *BG *CG *QZ *EP *BS *AS *GR **PGQuartz 48 42 25 56 17 34 18 46 37Plagioclase 22 18 4 10 35 12Microcline 12 7Calcite 36Muscovite 32 29 11 26Biotite 23 32 10 13 58 15 5 8Hornblende 4 6 18 4 32 6 1Olivine 17Pyroxene 21 5Tourmaline 8Epidote 6 4 3Lepidolite 4Opaque 3 3 5 2 9 2Others 1 1MG (Migmatite gneiss), BG (Biotite gneiss), CG (Calc-gneiss), QZ (Quartzite), EP (Epidiorite),BS (Biotite schist), AS (Amphibole schist), GR (Granite), PG (Pegmatite); * Average of 6samples, ** Average of 5 samples<strong>RMZ</strong>-M&G 2012, 59
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qLevel of average technical (theore
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414 Adewale, A., Olawale, O. O., Ma
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430 Kos, A., Dervarič, E.novega ve
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432 Kos, A., Dervarič, E.diamond w
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434 Kos, A., Dervarič, E.chines to
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436 Kos, A., Dervarič, E.the best
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438 Kos, A., Dervarič, E.Before th
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440 Kos, A., Dervarič, E.nally to
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444 Lajovic, A.disc brakes, further
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446 Lajovic, A.Slika 2. Izrez iz Si
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448 Lajovic, A.Livne lonce smo na n
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450 Lajovic, A.Ingersol pa je bil z
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452 Lajovic, A.Med delavci, ki so b
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454 Lajovic, A.imel vsak delavec na
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456 Lajovic, A.Slika 5. Izdelki Že
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458 Lajovic, A.pa se ni najbolje iz
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460 Lajovic, A.za delo. Promet na z
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462 Lajovic, A.Sredi osemdesetih le
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464 Lajovic, A.njem delu forme. Na
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466 Lajovic, A.Enourni film je mars
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470 Medved, J., Rosina, A., Vončin
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472 Author’s IndexAuthor`s Index,
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Contents476Phase contrast method fo
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Contents47859/4Calculation of stres
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Instructions to authors481Compositi
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Instructions to authors483NAVODILA
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Instructions to authors485Knjige:Ro
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Template487TEMPLATEThe title of the
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Template489References (Times New Ro
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Template491Obstajata dve sprejemlji
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