Abstract
Scheelite- and molybdenite-bearing scapolite skarn and plagioclase skarn occur as stratabound mineralizations in a terrain which has suffered regional metamorphism. Scapolite skarn formed as replacement skarns in plagioclase-bearing hornblendic gneiss whereas plagioclase skarn precipitated in fractures as vein skarn mineralizations. The genesis of these skarn deposits are closely connected to an episode of boudinage on the limbs of a large-scale dome-shaped fold. Fluid inclusion studies revealed that the ore-forming fluids were composed of CO2 with 2 to 17 mole% CH4, which formed due to decarbonation reactions during peak metamorphism at the end of the Caledonian orogenesis. Thermodynamic considerations indicate that scapolite and plagioclase formed above 550 °C and 2 Kbar pressure and were followed by precipitation of scheelite between 400 and 570 °C.
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References
Ackermann, J., Walton, B.J: (1960) Mineral development and deformation in metasedimentary rocks in the Glomfjord region, Northern Norway. Int. Geol. Congr. 21:33–42
Aitken, G.B. (1983) T-X CO 2 stability relations and phase equilibria of calcic carbonate scapolite. Geoch. et Cosmoch. Act. 47:351–362
Barabanov, V.F. (1971) Geochemistry of tungsten. Int. Geol. Rev. 13:332–344
Busch, K. (1989) Tungsten deposits related to solution-remobilization during regional metamorphism in the Bjellåtind area, Nordland, Norway (Danish). M. Sc. Thesis University of Copenhagen
Crawford, M.L., Nichols, J. (1985) FORTRAN programs for calculations of fluid properties from microthermometric data on fluid inclusions. Comp. and Geosci. 11:619–645
Einaudi, T.M., Meinert, L.D., Newberry R.J. (1981) Skarn deposits. Econ. Geol. 75th Anniv. Vol. 317–391
Einaudi, T.M., Burt, D.M. (1982) Introduction-terminology, classification and composition of skarn deposits. Econ. Geol. 77:745–754
Foster, R.P., Mann, A.G., Armin, A., Burmeister, B.B. (1977) Solubility of scheelite in hydrothermal chloride solution. Chem. Geol. 20:27–45
Goldschmidt, J.R. (1976) Scapolites, granulates and volatiles in the lower crust. Geol. Soc. Amer. Bull. 87:161–168
Goldschmidt, J.R., Newton, R.C. (1977) Scapolite-plagioclase stability at high pressures and temperatures in the system NaAlSi3O8-CaAl2Si2O8-CaCO3-CaSO4. Amer. Min. 62:1063–1081
Holmes, M. (1965) Structures of the area north of Ørnes, Nordland, Norway. Geol. Surv. Norw. 242:63–87
Høll, R. (1971) Scheelitvorkommen in Österreich. Erzmetall 24:273–282
Høll, R. (1977) Early Paleozoic ore deposits of the Sb-U-Hg formation in the eastern Alps and their genetic interpretation, in: Time and Stratabound Ore Deposits. Klemm, D.D. and Schneider, H.J. (eds.) pp. 169–199. Springer: Berlin, Heidelberg, New York
Høll, R., Schenk, P. (1988) Metamorphosed hydrothermal eruption breccia (conglomerate) in the Felbertall Scheelite deposit, eastern Alps, Austria. Mar. Geol. 84:273–282
Kwak, T.A.P. (1987) Sn-W skarn deposits. Elsevier, Amsterdam, pp. 415
Larsen, R.B. (1988) Tungsten-deposits in the Bjellåtind area Nordland, Norway (Danish). M. Sc. thesis University of Copenhagen, pp. 110
Larsen, R.B. (1989) Evolution of the fluid phase in regional tungsten skarn from the Norwegian Caledonides: a fluid inclusion study. Geological Society of America Abstracts with programs 21:A286
Maucher, A. (1972) Time and stratabound ore deposits and the evolution of the Earth. 24th Geol. Congr. Can., pp. 83–88
Maucher, A. (1976) The stratabound cinnabar-stibnite-scheelite deposits. In: Wolf, K.H. (ed.) Handbook of Stratabound and Stratiform Ore Deposits, pp. 477–501
Manning, D.A.C., Henderson, P. (1984) The behavior of tungsten in granitic-melt-vapour systems. Contr. Min. Petr. 86:286–293
Oterdoom, W.H., Gunter, W.D. (1983) Activity models for plagioclase and CO2-scapolites: an analysis of field and laboratory data. Am. J. Sci. 283-A:255–283
Rutland, R.W.R., Nichollson, R. (1965) Tectonics in the Caledonides in part of Nordland, Norway. Jour. Geol. Soc. Lond. 121:73–109
Rutland, R.W.R., Sutherland, D.S. (1967) The chemical composition of granitic gneisses and sparagmitic metasediments in the Glomfjord region, Northern Norway. Geol. Surv. Norw. 47:359–374
Skaarup, P. (1974) Stratabound scheelite mineralizations in skarn and gneisses from the Bindal area, Northern Norway. Min. Dep. 9:299–308
Stemprok, M., Voldan, J. (1982) Solubility of tungstic oxide in granitic melts. Vestnik 6:321–384
Stephens, M.B., Gustavson, M., Ramberg, I.B., Zachrison, E. (1985) The Caledonides of central north Scandinavia — a tectonostratigraphic overview, in: The Caledonide Orogen — Scandinavia and related areas. Gee, D.G., Stuart, B.A. (eds.) pp. 135–162. John Wiley, New York
Wilson, M.R., Nichollson, R. (1973) The structural setting and geochronology of the basal granitic gneisses in the Caledonide part of Nordland Norway. Jour. Geol. Soc. Lond. 129:365–387
Winkler, G.F.H. (1979) Petrogenesis of metamorphic rocks, 5th. ed. p. 269. Berlin-Heidelberg-New York: Springer
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Larsen, R.B. Tungsten skarn mineralizations in a regional metamorphic terrain in northern Norway: a possible metamorphic ore deposit. Mineral. Deposita 26, 281–289 (1991). https://doi.org/10.1007/BF00191075
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DOI: https://doi.org/10.1007/BF00191075