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huca ?- . li,,,ilmcn Lima -aluccrn kllhupc°r :in clci,mipicn kicilajicn pctrOtv,ikaalisia t)minai,uulc,ia csit( , ttv'n3 lihc s ,uskcptihilitcetti clia< ranunrilla I ) Alcnunan arkcci,cn kuurcn granuliittilohkojen 2Mlajuja (cmhv - I it) sck :i ya,Ciacia alenlntan ntetanIOrliu),,ia,trcn raniu)icluja ja mi matiittcja pNccl) . 2) GraniittiutunLIta ( I11jv11t) sek :i hicrIynLII2 a
+0 Summary : YRF-Q JA"I'FRNAR)' ROCKS OE THF IISALMI MAP SHEET AREA Introduction The area covered by the lisalmi nrtp sheet is situated in northern Savo, halfway between Kuopio and Kajaani . The bedrock of the area was previously mapped by Wilknlan (1929 & 1935) at I : -400 000 scale . Some special surveys . e .g . of block structures (Kauppinen 1973) and diahases (Toivola 1988), have also been made in the area . The map sheet area consists predominantly (ca 5Kb) of Archaean amphiholite-banded tonalitic and trondhjemitic mignlatites . Relatively extensive Proterozoic intrusive',, granites . granodiorites . tonalites and quartz diorites, are concentrated in the western part of the map sheet area, close to the craton border . Proterozoic schists are mainly unexposed . The only mica schist and gneiss outcrops are ill the western Illargin area . The Archaean bedrock shoves very intense block faulting in the Tisalmi area . The blocks are usually separated front each other by blastomylonites . Abrupt changes in the erosion level and concequently in the nletamorphir grade between the blocks are also characteristic of the area . Archaean area because of the substantial block movements, the Archaean rocks in the lisalnli area vary' greatly in appearance and metamorphic grade . The most typical Archaean rock in the area is an amphiholite-handed tonalitic-tiondhjenlitic nligmatite or granitoid, which play he strongly cataclastic, epidotized and alhitized . This type of basement is characteristic of the western border zone, next to the Proterozoic area and around the intense fractures . Neosonle is locally predominant . hut large coherent amphiholitic palaeosome horizons also occur . Stronlatic and schollen migmatites are predominant but the nehulitic type frequently occurs in the western border zone . Well-preserved granulite facies mineral assemblages are met with in the highgrade blocks . which are clearly distinguished on the magnetic map (Fig . 7) as strong positive anomalies . The rocks of the high-grade blocks are handed or honogeneous hypersthene-hearing quartz diorites leucodiorites (enderbites), rich in plagioclase . Amphiholite hands and broader horizons mostly contain two pyroxenes and are often garnetiferous . Blastonlvlonitic quartz-epidote rocks and amphiholites occur in the zones between the blocks . These fracture and fault zones have clearly been active several times, probably ever since the late Archaean .
Page 1 and 2: WOMEN GEOLOGINEN KARTTA 1 :100 000
Page 3 and 4: 2 Paavola, Jorma 1991 . lisaluicn k
Page 5 and 6: SISALTO-CONTENTS Tutkimusvaiheet 5
Page 7 and 8: 6 IISALMI 3341 Kuva 1 . Fri tutkilo
Page 9 and 10: 8 Kuv .i 3 . Amfiboliittiraitainen
Page 11 and 12: 1 0 huv'a ~; . Aehuliitt t,t :u -kc
Page 13 and 14: 1 2 Kuva 7 . lisalmen kartta-alueen
Page 15 and 16: 1 4 Kuva 9 . Ruhjeeseen liittyvaa m
Page 17 and 18: Ku, a I I . RU h cvv hvkk son Intty
Page 19 and 20: 18 Taulukko 1 . Tektono-metasomaatt
Page 21 and 22: ?(I scn sU - atigrafiaa . HCICIan j
Page 23 and 24: Kuva 15 . Hienorakeista ja k( Kirak
Page 25 and 26: 24 Kuva 16 . Iisalmen kartta-alueen
Page 27 and 28: 26 1'aulukko 3 . jatkoa . !able 3 .
Page 29 and 30: 2 ti , Ku%j 1 1 ), fficnoiAcincn di
Page 31 and 32: 30 Taulukko 4 . jatkoa Table 4 . co
Page 33 and 34: NIF"1' ;111ORPI\F\ JA RWFNTFFLLINFN
Page 35 and 36: 0 10 km J f AN , LIJ ArZAA Kuva 23
Page 37 and 38: Taulukko 5 . Petrofysikaalisten mit
Page 39: 3 8 N a v 100000 1000 100 100000 y
Page 43 and 44: 1 2 and magmatism is indicated by m
Page 45 and 46: 1+ . . . : . . . . : . : Paavola, J
Page 47: 0043 003, 1022 1a 67° 77 • 21- 3

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