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Suomen Geologinen Seura. N : 0 35. Geologiska Sällskapet i Filliand. 57 • tt tt OJ # tt :p JW;u tt tt tt tt • f. tt • • • 0 tt tt· • i ~" I J Fig. 1. Location of the sampies investigated. 1 = microcline; 2 = orthoclase; I = map sheet 2232; II = map sheet 3134. 10 8996-63
58 Bulletin de la Commission geologique de Finlande N: 0 212. Fig. 2. Granite with orthoclase porphyroblasts at the church of Keuruu, Central Finland. clase (Fig. 2). This rocks is quite homogeneous and in the yards and along the streets of Keuruu it is weIl exposed at many places. The potash feldspar is mainly concentrated into insets, the matrix being of granodioritic composition (Table 1). Among the dark minerals, biotite conspicuously prevails Table 1. '~ Chemie al eomposition and ealeulated mode of the matrix of monzonitie or· thoclase granite. Speeimen 449 /LP/62. Keuruu Village. Analyst: Pentti Ojanperä, 1963. Weight per cent Si0 2 ..•••••••••••••.••••••••••...••• TiO •... . ... .. . ... ..... .. ............ Al.O s .......... ... .. ........ ....... . Fe 2 0 a ......... • .. .... ... .... .. ...... FeO ............................... . MnO ............................... . MgO .............................. .. CaO ..... .... ....... . ..... ....... .. . Na.O .............................. . K 2 0 . ... .. ..... . ..... .. ........ . .. . . p.O s ............................... . CO •........... . . .... ... .. ...... ..... H.O+ ............................. . H.O- ................ ....... .. .... . F ................................ . . . 64.79 O.H 15.57 1. 79 3.68 0.09 1.52 4.10 3.45 3.55 0.16 0.00 0.'8 0.10 0.05 99.87 -O=F2 ····· ··· ····················O.02 99.85 Calculated mode quartz .......................... . albite .................. ..... .... . anorthite ...... . ............... .. . potash feldspar .................. . biotite ...... ... ........... . ..... . ma~netite ....................... . sphene ........ ..... .. ........... . apatite ...... .. .................. . rest .... . ....................... . 23.70 28.82 17.61 13.H 11.36 2.5 5 1.87 0.3' 0.86 99.85
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REFERENCES BAAS BECKING, L. G. M. a
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