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Structural evolution of an early Proterozoic strata-bound Cu-Co-Zn deposit, Outokumpu, Finland

Published online by Cambridge University Press:  03 November 2011

T. J. Koistinen
T. J. Koistinen
Affiliation:
Exploration Department, Outokumpu Oy, SF 83500 Outokumpu, Finland.
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Abstract

The massive pyrite-pyrrhotite-chalcopyrite-sphalerite deposit of Outokumpu, comprising the Keretti and Vuonos orebodies, is a deformed and metamorphosed strata-bound mass associated with mineralised stockworks. Mobilisation of much of the ore followed formation of large recumbent isoclinal folds that are the major structures of the surrounding rocks and associated with the modification of originally flat saucer-shaped ore lenses into elongate ruler-shaped masses. Further modification of shape took place at the mobilisation stage with much of the pyrrhotitic ore, particularly, now occupying the thickest parts of the orebodies in the form of breccia or microbreccia. In many parts gross original characters still exist and the pyritic and pyrrhotitic constituents of the ore have survived as separate entities while locally the pyritic ore retains pre-deformational characteristics and consistent stratigraphic position within a thin horizon.

Both ore and country rocks show evidence of extensive polyphase deformation with the effects of six fold phases shown in the ore. Mineral assemblages in the country rocks indicate a middle amphibolite facies peak of metamorphism. The serpentinite-black schist-carbonate-quartzite rock assemblage, with which the ore is associated, was tectonically incorporated within the regionally extensive mica schist by even earlier subhorizontal thrusting. This is related to the movement of a thrust nappe with the interdigitation of an ocean-floor ophiolite assemblage and flysch deposited during ocean closure associated with Svecokarelian tectonism.

The original formation of the Keretti and Vuonos sulphide masses took place in a marine exhalative environment with a pyritic layer overlying a pyrrhotitic layer in each of the two c. 4 km diameter irregularly oval-shaped depressions whose centres were c. 8 km apart. The mineralised stockwork below each mass represents the upper parts of the conduit for metalbearing fluids in a convective system.

Keywords

boudinbrecciadeformationductileexhalativefoldfoliationKerettilineationmarinemetamorphismmobilisationnickelophiolitepolyphasepyritepyrrhotitesedimentationserpentinitestockworksSvecokarelidesthrustVuonos.
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 72 , Issue 2 , 1981 , pp. 115 - 158
Copyright
Copyright © Royal Society of Edinburgh 1981

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References

Blais, S., Auvray, B., Capdevila, R., Jahn, B. M., Hameurt, J. & Bertrand, J. M. 1978. The Archaean greenstone belts of Karelia (eastern Finland) and their komatiitic and tholeiitic series. In Windley, B. F. & Naqvi, S. (eds) Archaean Geochemistry, 87–107. Amsterdam: Elsevier.CrossRefGoogle Scholar
Bogdanov, A. A., Gorbunov, G. I., Gorskij, I. I., Unksov, V. A. & Shatalov, E. I. 1967. Otserednaja sessija Komissii po geologit-seskoi karte Mira Mezdunarodnogo geologitseskogo Kongressa. SOV GEOL 3, 130–8.Google Scholar
Borchert, H. 1954. Kritische Anmerkungen zu zwei neuen Arbeiten über Outokumpu, Finnland. CHEM DER ERDE 17, 1–5; Z ERZBERGBAU METALLHUETTENWES 7, 82–4.Google Scholar
Bowes, D. R. 1975. Scotland-Finland Precambrian correlations. BULL GEOL SOC FINL 47, 1–12.CrossRefGoogle Scholar
Bowes, D. R. 1976a. Tectonics in the Baltic Shield in the period 2000–1500 million years ago. ACTA GEOL POL 26, 355–76.Google Scholar
Bowes, D. R. 1976b. Archaean crustal history in the Baltic Shield. In Windley, B. F. (ed.) The Early History of the Earth, 469–79. London: Wiley.Google Scholar
Bowes, D. R. 1978. Characterization of regimes of polyphase deformed metamorphic rocks in the Baltic Shield. In Verwoerd, W. J. (ed.) Mineralization in Metamorphic Terranes, 463–75. GEOL SOC S AFR SPEC PUBL 4. Pretoria: van Schaik.Google Scholar
Bowes, D. R. 1980a. Structural sequence in the gneissose complex of Eastern Finland as a basis for correlation in the Presvecokarelides. ACTA GEOL POL 30, 15–26.Google Scholar
Bowes, D. R. 1980b. Correlation in the Svecokarelides and a crustal model. In Mitrofanov, F. P. (ed.) Principles and criteria of subdivision of Precambrian in mobile zones, 294–303. Leningrad: Nauka.Google Scholar
Bowes, D. R. & Gaàl, G. 1981. Precambrian record of the eastern North Atlantic borderlands. In Kerr, J. W. & Ferguson, A. J. (eds) Geology of the North Atlantic Borderlands, 31–35. MEM CAN SOC PET GEOL 7.Google Scholar
Brun, J-P. 1980. The cluster-ridge pattern of mantled gneiss domes in eastern Finland. EARTH PLANET SCI LETT 47, 441–58.CrossRefGoogle Scholar
Campbell, D. S. 1978. Structural and metamorphic studies in the Svecokarelides, Tampere, Finland. Unpublished Ph.D. Thesis, Glasgow University.Google Scholar
Campbell, D. S., Treloar, P. J. & Bowes, D. R. 1979. Metamorphic history of staurolite-bearing schist from the Svecokarelides, near Heinävaara, eastern Finland. GEOL FÖREN STOCKHOLM FÖRH 101, 105–18.CrossRefGoogle Scholar
Degens, E. T. & Ross, D. A. (eds). 1969. Hot brines and recent heavy metal deposits in the Red Sea. New York: Springer-Verlag.CrossRefGoogle Scholar
Disler, J. 1953. Die Kupferkieslagerstätte von Outokumpu, Finnland. BULL COMM GEOL FINL 161, 1–108.Google Scholar
Eskola, P. 1933. On the chrome minerals of Outokumpu. BULL COMM GEOL FINL 103, 26–44.Google Scholar
Eskola, P. 1949. The problem of mantled gneiss domes. Q J GEOL SOC LONDON 104, 461–76.CrossRefGoogle Scholar
Eskola, P. 1963. The Precambrian of Finland. In Rankama, K. (ed.) The Precambrian 1, 145–263. New York: Wiley.Google Scholar
Ethier, V. G., Campbell, F. A., Both, R. A. & Krouse, H. R. 1976. Geological setting of the Sullivan orebody and estimates of temperatures and pressures of metamorphism. ECON GEOL 71, 1570–88.CrossRefGoogle Scholar
Gaál, G. 1964. Jatul und karelische Molasse im S-Koligebiet in Nordkarelien und ihre Beziehung zum Gebirgsbau des präkambrischen Orogens. BULL COMM GEOL FINL 213, 1–45.Google Scholar
Gaál, G. 1977. Structural features of Precambrian, stratabound sulphide ore deposits of Finland, GEOL FÖREN STOCKHOLM FÖRH 99, 118–26.CrossRefGoogle Scholar
Gaál, G. 1980. Geological setting and intrusion tectonics of the Kotalahti nickel-copper deposit, Finland. BULL GEOL SOC FINL 52, 101–28.CrossRefGoogle Scholar
Gaáll, G., Koistinen, T. & Mattila, E. 1975. Tectonics and stratigraphy of the vicinity of Outokumpu, North Karelia, Finland. BULL GEOL SURV FINL 271, 1–67.Google Scholar
Gaáll, G., Mikkola, A. & Söderholm, B. 1978. Evolution of the Archean crust in Finland. PRECAMBRIAN RES 6, 199–215.CrossRefGoogle Scholar
Gillen, C. & MacDonald, J. G. 1971. Report on expedition to Finland 1970. Glasgow: University of Glasgow Exploration Society.Google Scholar
Goldhaber, M. B. & Kaplan, I. R. 1974. The sedimentary sulphur cycle. In Goldberg, E. D. (ed.) The sea v. 5, Marine chemistry, 569–655. New York: Wiley Interscience.Google Scholar
Grundström, L. 1980. The Laukunkangas nickel-copper occurrence in southeastern Finland. BULL GEOL SOC FINL 52, 23–53.CrossRefGoogle Scholar
Haapala, P. 1936. On serpentine rocks in Northern Karelia. BULL COMM GEOL FINL 114, 1–80.Google Scholar
Haapala, P. S. 1969. Fennoscandian nickel deposits. ECON GEOL MONOGR 4, 262–75.Google Scholar
Hartman, M. & Nielsen, H. 1969. δ 34S-Werte in rezenten Meeressedirnenten und ihre Deutung am Beispiel einiger Sedimentprofile aus der westlichen Ostsee. GEOL RUNDSCH 58, 621–55.CrossRefGoogle Scholar
Hoffman, P. F. 1981. Wopmay orogen: a Wilson Cycle of early Proterozoic age in the Northwest of the Canadian Shield. SPEC PAP GEOL ASSOC CAN 20, 523–49.Google Scholar
Holdaway, M. J. 1971. Stability of andalusite and the aluminum silicate phase diagram. AM J SCI 271, 97–131.CrossRefGoogle Scholar
Honkamo, M. 1972. Koli-Juuan alueen ultramafiset kivilajit. The ultramafic rocks of the Koli-Juuka area (in Finnish). Unpublished M.Sc. Thesis, University of Oulu.Google Scholar
Hopgood, A. M. 1971. Correlation by tectonic sequence in Pre-cambrian gneiss terranes. GEOL SOC AUST SPEC PUBL 3, 367–76.Google Scholar
Hopgood, A. M. 1973. The significance of deformational sequence in discriminating between Precambrian terranes. SPEC PUBL GEOL SOC S AFR 3, 45–51.Google Scholar
Hopgood, A. M. 1980. Polyphase fold analysis of gneisses and migmatites. TRANS R SOC EDINBURGH EARTH SCI 71, 55–68.CrossRefGoogle Scholar
Hopgood, A. M. & Bowes, D. R. 1972. Application of structural sequence to the correlation of Precambrian gneisses, Outer Hebrides, Scotland. BULL GEOL SOC AM 83, 107–28.CrossRefGoogle Scholar
Hopgood, A. M. & Bowes, D. R. 1980. Structural analysis of folded cooling joints in a near-concordant minor intrusion. GEOL RUNDSCH 69, 84–93.CrossRefGoogle Scholar
Hopwood, T. P. 1978. Conformable elongate orebodies and intrafolial folds parallel to a mineral streaking lineation. In Verwoerd, W. J. (ed.) Mineralization in metamorphic terranes, 41–51. SPEC PUBL GEOL SOC S AFR 4. Pretoria: van Schaik.Google Scholar
Huhma, A. 1971. Geological map of Finland 1:100 000, sheets 4222, 4224, 4311. Otaniemi: Geological Survey of Finland.Google Scholar
Huhma, A. 1975. Geological map of Finland 1:100 000, sheets 4222, 4224, 4311. Explanation to the map, English summary: Precambrian rocks of the Outokumpu, Polvijärvi, and Sivak-kavaara map sheet areas. Otaniemi: Geological Survey of Finland.Google Scholar
Jelínek, E., Souček, J., Bluck, B. J., Bowes, D. R. & Treloar, P. J. 1980. Nature and significance of beerbachites in the Ballantrae ophiolite, SW Scotland. TRANS R SOC EDINBURGH EARTH SCI 71, 159–79.CrossRefGoogle Scholar
Juve, G. 1977. Metal distribution at Stekkenjokk: primary and metamorphic patterns. GEOL FÖREN STOCKHOLM FÖRH 99, 149–58.CrossRefGoogle Scholar
Kahma, A. 1973. The main metallogenic features of Finland. BULL GEOL SURV FINL 265, 1–28.Google Scholar
Kaplan, I. R., Emery, K. O. & Rittenberg, S. C. 1963. The distribution and isotopic abundance of sulfur in recent marine sediments off Southern California. GEOCHIM COSMOCHIM ACTA 27, 297–331.CrossRefGoogle Scholar
Kojonen, K. 1981. Geology, geochemistry and mineralogy of two Archean nickel-copper deposits in Suomussalmi, eastern Finland. BULL GEOL SURV FINL 315, 1–58.Google Scholar
Kouvo, O. 1958. Radioactive age of some Finnish Precambrian minerals. BULL COMM GEOL FINL 182, 1–70.Google Scholar
Kouvo, O., Huhma, M. & Vuorelainen, Y. 1959. A natural cobalt analogue of pentlandite. AM MINERAL 44, 897.Google Scholar
Kouvo, O. & Tilton, G. R. 1966. Mineral ages from the Finnish Precambrian. J GEOL 74, 421–42.CrossRefGoogle Scholar
Laajoki, K. & Lavikainen, S. 1977. Rare-earth elements in the Archean iron formation and associated schists in Ukkolanvaara, Ilomantsi, SE Finland. BULL GEOL SOC FINL 49, 105–23.CrossRefGoogle Scholar
Large, R. R. 1977. Chemical evolution and zonation of massive sulfide deposits in volcanic terrains. ECON GEOL 72, 549–72.CrossRefGoogle Scholar
Lavikainen, S. 1977. Ilomantsin Ukkolanvaaran alueen kallioperän synnyn ja kehityksen tulkintaa. Interpretation of the origin and evolution of the bedrock in Ukkolanvaara, Ilomantsi (in Finnish). Unpublished Phil. Lie. Thesis, University of Turku.Google Scholar
Macdonald, K. C. & Luyendyk, B. P. 1981. The crest of the East Pacific Rise. SCI AM 244, 86–99.CrossRefGoogle Scholar
Mäkelä, K. 1981. On the potential of finding Outokumpu-type ore deposits in East- and North-Finland (English summary). GEOLOGI 33, 20.Google Scholar
Mäkelä, M. 1974. A study of sulfur isotopes in the Outokumpu ore deposit, Finland. BULL GEOL SURV FINL 267, 1–45.Google Scholar
Mäkinen, E. 1921. Över geologin inom Outokumpu området. MEDD GEOL FÖREN HELSINGFORS 1919–1920, 10–17.Google Scholar
Marjoribanks, R. W., Rutland, R. W. R., Glen, R. A. & Laing, W. P. 1980. The structure and tectonic evolution of the Broken Hill region, Australia. PRECAMBRIAN RES 13, 209–40.CrossRefGoogle Scholar
Mikkola, A. K. & Väisänen, S. 1972. Remobilization of sulphides in the Outokumpu and Vihanti ore deposits, Finland. 24th INT GEOL CONGR 4, 488–97.Google Scholar
Nykänen, O. 1971. Geological map of Finland 1:100 000, sheet 4241. English summary: Explanation to the map of rocks. Otaniemi: Geological Survey of Finland.Google Scholar
Papunen, H. 1970. Sulfide mineralogy of the Kotalahti and Hitura nickel-copper ores, Finland. ANN ACAD SCI FENN Ser A III, 109, 1–82.Google Scholar
Park, A. F. 1981. Basement gneiss domes in the Svecokarelides of eastern Finland: discussion. EARTH PLANET SCI LETT 55, 199–203.CrossRefGoogle Scholar
Park, A. F. & Bowes, D. R. 1982. Metamorphosed and deformed pillows from Losomäki: evidence of sub-aqueous volcanism in the Outokumpu association, eastern Finland. BULL GEOL SOC FINL 54 (in press).Google Scholar
Pedersen, F. D. 1980. Remobilization of the massive sulfide ore of the Black Angel mine, Central West Greenland. ECON GEOL 75, 1022–41.CrossRefGoogle Scholar
Pedersen, F. D. 1981. Polyphase deformation of the massive sulphide ore of the Black Angel mine, Central West Greenland, MINER DEPOSITA 16, 157–76.CrossRefGoogle Scholar
Pekkarinen, L. J. 1979. The Karelian formations and their depositional basement in the Kiihtelysvaara-Värtsilä area, east Finland. BULL GEOL SURV FINL 301, 1–141.Google Scholar
Peltola, E. 1960. On the black schists in the Outokumpu region in Eastern Finland. BULL COMM GEOL FINL 192, 1–107.Google Scholar
Peltola, E. 1968. On some geochemical features in the black schists of the Outokumpu area, Finland. BULL GEOL SOC FINL 40, 39–50.CrossRefGoogle Scholar
Peltola, E. 1978. Origin of Precambrian copper sulfides of the Outokumpu District, Finland. ECON GEOL 73, 461–77.CrossRefGoogle Scholar
Peltola, E. 1980. Geology of the Vuonos ore deposit. In Häkli, T. (ed.) Precambrian ores of Finland. Guide to excursions 078 A + C, Part 2 (Finland). 26thInternational Geological Congress, Paris, 1980, 33–41. Espoo: Geological Survey of Finland.Google Scholar
Piirainen, T. 1969. Initialer Magmatismus und sein Erzbildung in der Beleuchtung des Koli-Kaltimogebietes. BULL GEOL SOC FINL 41, 21–46.CrossRefGoogle Scholar
Piirainen, T., Honkamo, M. & Rossi, S. 1974. A preliminary report on the geology of the Koli area. BULL GEOL SOC FINL 46, 161–6.CrossRefGoogle Scholar
Plimer, I. R. 1978. Proximal and distal stratabound ore deposits. MINER DEPOSITA 13, 345–53.CrossRefGoogle Scholar
Plimer, I. R. & Finlow-Bates, T. 1978. Relationship between primary iron sulphide species, sulphur source, depth of formation and age of submarine exhalative sulphide deposits. MINER DEPOSITA 13, 399–410.CrossRefGoogle Scholar
Ramsay, J. G. 1967. Folding and fracturing of rocks. New York: McGraw-Hill.Google Scholar
Rossi, S. 1972. Ipatin Hattusaaren alueen kallioperä Pohjois-Karjalan liuskealueen koillisosassa. The bedrock of Ipatti Hattusaari in the NE part of North Karelian schist area (in Finnish). Unpublished M.Sc. Thesis, University of Oulu.Google Scholar
Russell, M. J., Solomon, M. & Walshe, J. L. 1981. The genesis of sediment-hosted, exhalative zinc + lead-copper deposits. MINER DEPOSITA 16, 113–27.CrossRefGoogle Scholar
Saksela, M. 1957. Die Entstehung der Outokumpu-Erze im Lichteder tektoriisch-metamorphen Stoffmobilisierung. NEUES JAHRB MINERAL ABH 91, 278–302.Google Scholar
Sangster, D. F. 1980. Quantitative characteristics of volcanogenic massive sulphide deposits. BULL CANINST MIN, 73, 74–81.Google Scholar
Sangster, D. F. & Scott, S. D. 1976. Precambrian, strata-boundm massive Cu-Zn-Pb sulphide ores of North America. In Wolf, K. H. (ed.) Handbook of Stratabound and Stratiform Ore Deposits 6, 129–222. Amsterdam: Elsevier.Google Scholar
Schermerhorn, L. T. G. 1978. Epigenetic magnesium metasomatism or syngenetic chloritite metamorphism at Falun and Orijarvi. TRANS INST MIN METALL 87, B162–7.Google Scholar
Shanks, W. C. & Bischoff, T. L. 1980. Geochemistry, sulfur isotope composition, and accumulation rates of Red Sea geothermal deposits. ECON GEOL 75, 445–59.CrossRefGoogle Scholar
Sillitoe, R. H. 1972. Formation of certain massive sulphide deposits at sites of sea-floor spreading. TRANS INST MIN METALL 81, B141–8.Google Scholar
Simonen, A. 1980. The Precambrian in Finland. BULL GEOL SURV FINL 304, 1–58.Google Scholar
Skinner, B. J., White, D. E., Rose, H. J. & Mays, R. E. 1967. Sulphides associated with the Salton Sea geothermal brine. ECON GEOL 62, 316–30.CrossRefGoogle Scholar
Skinner, W. R., Bowes, D. R. & Khoury, S. G. 1969. Polyphase deformation in the Archean basement complex, Beartooth Mountains, Montana and Wyoming. BULL GEOL SOC AM 80, 1053–60.CrossRefGoogle Scholar
Smellie, J. A. T. 1974. Formation of atoll garnets from the aureole of the Ardara pluton, Co. Donegal, Ireland. MINERAL MAG 39, 878–88.CrossRefGoogle Scholar
Stacey, J. S., Doe, B. R., Silver, L. T. & Zartman, R. E. 1977. Plumbotektonika IIA. Dokembriskije Koltsedannije mestorozdenija. In Karpenko, S. F. (ed.) Geokhronologija i problemi rudoobrazovanija, 93–106. Moscow: Acad. Nauk.Google Scholar
Treloar, P. J., Koistinen, T. J. & Bowes, D. R. 1981. Metamorphic development of cordierite-amphibole rocks and mica schists in the vicinity of the Outokumpu ore deposit, Finland. TRANS R SOC EDINBURGH EARTH SCI 72 (in press).CrossRefGoogle Scholar
Trüstedt, O. 1921. Över geologin inom Outokumpu området, diskussion. MEDD GEOL FÖREN HELSINGFORS 1919-1920, 16.Google Scholar
Tuominen, H. V., Aarnisalo, J. & Söderholm, B. 1973. Tectonic patterns in the Central Baltic Shield. BULL GEOL SOC FINL 45, 205–17.CrossRefGoogle Scholar
Tuominen, H. V. & Mikkola, T. 1950. Metamorphic Mg-Fe enrichment in the Orijärvi region as related to folding. BULL COMM GEOL FINL 150, 67–92.Google Scholar
Vähätalo, V. 1953. On the geology of the Outokumpu ore deposit in Finland. BULL COMM GEOL FINL 164, 1–98.Google Scholar
van Breemen, O. & Bowes, D. R. 1977. Rb-Sr muscovite age of a pegmatite near Sivakkavaara, Finland. BULL GEOL SOC FINL 49, 7–10.CrossRefGoogle Scholar
Väyrynen, H. 1939. On the geology and tectonics of the Outo-kumpu ore field and region. BULL COMM GEOL FINL 124, 1–91.Google Scholar
Väyrynen, H. 1954. Suomen kallioperä. Bedrock of Finland (in Finnish). TIEDEKIRJASTO 27, 1–260.Google Scholar
Vrána, S. 1975. Magnesian-aluminous rocks, the associated ore mineralization and the problem of magnesium-iron metasomatism. KRYSTALINIKUM 11, 101–14.Google Scholar
Wetherill, G. H., Kouvo, O., Tilton, G. R. & Gast, P. W. 1962. Age measurements on rocks from the Finnish Precambrian. J GEOL 70, 74–88.CrossRefGoogle Scholar
Willan, R. C. R. & Hall, A. J. 1980. Sphalerite geobarometry and trace-element studies on stratiform sulphide from McPhun's Chairn, Argyll, Scotland. TRANS INST MIN METALL 89, B31–40.Google Scholar