RMZ â MATERIALI IN GEOOKOLJE

More documents

Recommendations

Info

348 Akinola, O. O., Talabi, A. O.compressive strength 32.4–84.50 N/mm 2 ; wet density 2.01–2.30 g/cm 3 ;water absorption capacity 0.02–0.24 %; porosity 0.01–0.58 % and pH6.7–7.3. Industrial assessments using the evaluated physical propertiesindicate that the gneisses, quartzite, epidiorite and granite of the area aresuitable for construction purposes.Izvleček: Kamnine predkambrijske podlage z območja Ijero Ekiti vjugozahodni Nigeriji smo raziskali z namenom opredeliti njihovosestavo in geotehnične lastnosti v luči njihove gospodarskeuporabnosti. Del raziskave je obsegal sistematično geološko kartiranještudijskega ozemlja. Nadalje so bile v šestih vzorcih odvsake glavne kamnine podlage določene glavne kemične prvine zinduktivno vezano plazemsko atomsko emisijsko spektrometrijo(ICP- AES) v Activation Laboratories v Ontariu v Kanadi, medtemko so opravili fizikalne preiskave v laboratoriju organizacije TreviFoundations v Lagosu v Nigeriji.Geološko kartiranje območja je razkrilo kamnine kompleksa migmatitnegagnajsa, kvarcit, mafično-ultramafično združbo in skrilavekamnine z redkimi granitnimi in pegmatitnimi intruzijami,strmo vtisnjenimi v starejših kamninskih skladovnicah. S petrografskoraziskavo so bili ugotovljeni kremen, albit, biotit, rogovačo,olivin, piroksen in biotit kot poglavitni minerali v kamninahpodlage. Analizni rezultati kažejo, da tvorijo glavni delež oksidovv kamninah SiO 2, Al 2O 3and Fe2O3. Izjema je kalcitni gnajs, ki vsebujevisoke deleže CaO (15,15 %) in MgO (13,49 %). VsebnostiTiO 2in P2O 5sta v vseh preiskovanih kamninah manjši od 0,1 %oziroma 0,3 %. Rezultati fizikalnih preizkusov so naslednji: prostorninskamasa 2,54–2,85 g/cm 3 , tlačna trdnost 32,4–84,50 N/mm 2 , gostotav vlažnem stanju 2,01–2,30 g/cm 3 , vpojnost vode 0,02–0,24 %,poroznost 0,01–0,58 % in pH 6,7–7,3. Iz ugotovljenih fizikalnihlastnosti sledi, da so gnajsi, kvarcit, epidiorit in granit s tega območjaprimerni za uporabo v gradbeništvu.Key words: Archean-proterozoic, geotechnical characteristics,basement rocks, compressive strengthKljučne besede: arhaik-proterozoik, geotehnične lastnosti, kamninepodlage, tlačna trdnost<strong>RMZ</strong>-M&G 2012, 59
Petrochemical characteristics and geotechnical properties of crystalline rocks in the ...349IntroductionRugged relief characterized by prominentinselbergs is a common feature ofmany parts of Nigeria and in particularEkiti State in the southwestern part ofthe country. These rocks, apart from notgenerating revenue from tourism, havenot been fully exploited for other majoreconomic purposes considering theavailable enormous quantity that occurin the area. Underutilization of theserocks may be attributable to insufficientgeological information on the assessmentof their properties on the one handand shallow knowledge of what theycould be used for on the other hand.These crystalline rocks could serve asraw material in most construction industriesand as such contribute tremendouslyto the socio-economic developmentof the study area. This investigationis therefore aimed at evaluatingthe compositional features and physicalcharacteristics of Ekiti crystalline rocksvis-à-vis their industrial application.Regional Geological SettingNigeria lies within the Pan-Africanmobile belt specifically between theCongo craton to the southeast andWest African craton to the west (Figure1). Geology of Nigeria is made ofsedimentary and crystalline rocks inalmost equal proportions. The sedimentaryrock sequences occupy themarginal and intracontinental basinsand belong to the Cretaceous-Recentage spectrum and lie unconformablyon the basement complex rocks.The rocks constituting the basementcomplex (Figure 2), despite disagreementson lithological delineations, areloosely categorized into three majorgroups: the migmatite-gneiss complex,the schist belts and the Pan-AfricanGranites (Elueze, 2000). The migmatitegneiss complex 2.0–3.0 Ga; (Rahamanet al., 1988, Dada & Briqueu,1998) is the oldest and most abundantrock type in the basement and is a productof several tectonothermal eventsthat have brought rocks of variousorigins together. In addition, the schistbelts, comprise low-grade metasedimentsand metabasic rocks that cropout in a series of distinctly N-S trendingsynformal troughs infolded intothe crystalline migmatite-gneiss complex.They are about the best-studiedgroup of rocks in Nigeria (Russ, 1957,Truswell & Cope, 1963) because ofthe mineralization such as gold, BandedIron Formation (BIF), tin, tantalum,niobium and marble, associated withthem (Oyinloye, 2006). These rocksshow distinctive petrological, structuraland metallogenic features (Okunlola,2005). The schist belts in southwesternNigeria include Iseyin-Oyan,Egbe-Isanlu, Ife-Ilesha and Igarraschist belts (Rahaman, 1976; Odeyemi,1977; Annor et al 1996). Others<strong>RMZ</strong>-M&G 2012, 59
Page 4 and 5: IVTable of Contents - KazaloProfess
Page 7 and 8: Calculation of stress-strain depend
Page 11 and 12: () = (, )() () ()Calculation
Page 13 and 14: , ) (, )(, ) 1 () + = (, ) =
Page 21: RMZ - Materials and Geoenvironment,
Page 25 and 26: Petrochemical characteristics and g
Page 34 and 35: 360 Akinola, O. O., Talabi, A. O.A
Page 36 and 37: 362 Akinola, O. O., Talabi, A. O.of
Page 38 and 39: 364 Sunmonu, L. A., Adagunodo, T. A
Page 66 and 67: 392 Shemetov, P. A., Bibik, I. P.in
Page 68 and 69: 394 Shemetov, P. A., Bibik, I. P.
Page 70 and 71: k =1.05+Dλ = 1+k =( s )396 Shemeto
Page 72 and 73:
398 Shemetov, P. A., Bibik, I. P.si
Page 74 and 75:
у 3 b400 D = f eShemetov, P. A., B
Page 76 and 77:
V4BEK Q σBEad = ,commQрσV 01 +
Page 78 and 79:
404 Shemetov, P. A., Bibik, I. P.wh
Page 80 and 81:
thrмR iλ = 2 λ= 100⋅exp[ −(
Page 82 and 83:
qLevel of average technical (theore
Page 84 and 85:
.6670.05=0.35k1,05+D avet( s3≥ Kt
Page 86 and 87:
RMZ-M&G 2012, 59
Page 88 and 89:
414 Adewale, A., Olawale, O. O., Ma
Page 90 and 91:
Page 92 and 93:
Page 94 and 95:
Page 96 and 97:
Page 98 and 99:
Page 100 and 101:
Page 102 and 103:
RMZ-M&G 2012, 59
Page 104 and 105:
430 Kos, A., Dervarič, E.novega ve
Page 106 and 107:
432 Kos, A., Dervarič, E.diamond w
Page 108 and 109:
434 Kos, A., Dervarič, E.chines to
Page 110 and 111:
436 Kos, A., Dervarič, E.the best
Page 112 and 113:
438 Kos, A., Dervarič, E.Before th
Page 114 and 115:
440 Kos, A., Dervarič, E.nally to
Page 116 and 117:
RMZ-M&G 2012, 59
Page 118 and 119:
444 Lajovic, A.disc brakes, further
Page 120 and 121:
446 Lajovic, A.Slika 2. Izrez iz Si
Page 122 and 123:
448 Lajovic, A.Livne lonce smo na n
Page 124 and 125:
450 Lajovic, A.Ingersol pa je bil z
Page 126 and 127:
452 Lajovic, A.Med delavci, ki so b
Page 128 and 129:
454 Lajovic, A.imel vsak delavec na
Page 130 and 131:
456 Lajovic, A.Slika 5. Izdelki Že
Page 132 and 133:
458 Lajovic, A.pa se ni najbolje iz
Page 134 and 135:
460 Lajovic, A.za delo. Promet na z
Page 136 and 137:
462 Lajovic, A.Sredi osemdesetih le
Page 138 and 139:
464 Lajovic, A.njem delu forme. Na
Page 140 and 141:
466 Lajovic, A.Enourni film je mars
Page 142 and 143:
RMZ-M&G 2012, 59
Page 144 and 145:
470 Medved, J., Rosina, A., Vončin
Page 146 and 147:
472 Author’s IndexAuthor`s Index,
Page 148 and 149:
RMZ-M&G 2012, 59
Page 150 and 151:
Contents476Phase contrast method fo
Page 152:
Contents47859/4Calculation of stres
Page 155 and 156:
Instructions to authors481Compositi
Page 157 and 158:
Instructions to authors483NAVODILA
Page 159 and 160:
Instructions to authors485Knjige:Ro
Page 161 and 162:
Template487TEMPLATEThe title of the
Page 163 and 164:
Template489References (Times New Ro
Page 165 and 166:
Template491Obstajata dve sprejemlji
show all

RMZ â MATERIALI IN GEOOKOLJE

Create successful ePaper yourself

Delete template?

Save as template?

RMZ â MATERIALI IN GEOOKOLJE