Contributions to Mineralogy and Petrology

, Volume 65, Issue 2, pp 111–121 | Cite as

Feldspathic hornblende and garnet granulites and associated anorthosite pegmatites from Doubtful Sound, Fiordland, New Zealand

  • G. J. H. Oliver


Feldspathic hornblende granulites from Doubtful Sound, New Zealand with the assemblage plagioclase+hornblende+clinopyroxene+orthopy-roxene +oxide+apatite are criss-crossed by a network of garnetiferous anorthosite veins and pegmatites. The feldspathic gneiss in contact with anorthosite has a reaction zone containing the assemblage plagioclase +garnet+clinopyroxene+quartz+rutile+apatite. The garnet forms distinctive coronas around clinopyroxene. The origin of these rocks is discussed in the light of mineral and whole rock chemical analyses and published experimental work.

It is thought that under conditions leading up to ∼ 750 °C, ∼ 8 kb load pressure and ∼ 5 kb H2O pressure, partial melting occured in feldspathic hornblende granulites. The melt migrated into extensional fractures and eventually crystallised as anorthosite pegmatites and veins. The gneisses adjacent to the pegmatites from which the melt was extracted changed composition slightly, by the loss of H2O and Na2O, so that plagioclase reacted simultaneously with hornblende, orthopyroxene, and oxide to form garnet, clinopyroxene, quartz and rutile.


Oxide Quartz Chemical Analysis Apatite Rutile 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Binns, R.A.: Hydrothermal investigations of the amphibole-granulite facies boundary. Geol. Soc. Aust. Spec. Publ. No. 2 (D.A. Brown, ed.), 341–344 (1969)Google Scholar
  2. Blattner, P.: Replacement of hornblende by garnet in granulite facies assemblages near Milford Sound, New Zealand. Contrib. Mineral. Petrol. 55, 181–190 (1976)Google Scholar
  3. Brown, G.C.: A comment on the role of water in the partial fusion of crustal rocks. Earth Planet. Sci. Lett., 9, 355–358 (1970)Google Scholar
  4. Buddington, A.F.: The occurrence of garnet in the granulite facies terrane of the Adirondack Highlands, a discussion. J. Petrol. 7, 331–335 (1966)Google Scholar
  5. Cawthorn, R.G.: Collerson, K.D.: The recalculation of pyroxene endmember parameters and the estimation of ferrous and ferric iron content from electron probe analyses. Am. Min., 59, 1203–1208 (1974)Google Scholar
  6. Clark, J.R., Papike, J.J.: Crystal-chemical characterization of omphacites. Am. Min., 53, 841 (1968)Google Scholar
  7. Flanagan, F.J.: 1972 values for international geochemical reference samples. Geochim. Cosmochim. Acta., 37, 1189–1200 (1973)Google Scholar
  8. Green, D.H., Ringwood, A.E.: An experimental investigation of the gabbro to eclogite transformation and its petrological applications. Geochim. Cosmochim. Acta., 31, 767–833 (1967)Google Scholar
  9. Green, T.H.: High pressure experimental studies on the mineralogical constitution of the Lower Crust. Phys. Earth Planet. Interiors, 3, 441–450 (1970)Google Scholar
  10. Hewins, R.H.: Pyroxene geothermometry of some granulite facies rocks. Contrib. Mineral. Petrol., 50, 205–209 (1975)Google Scholar
  11. Irving, A.J., Green, D.H.: Experimental duplication of mineral assemblages in basic inclusions of the Delegate breccia pipes. Phys. Earth Planet. Interiors, 3, 385–389 (1970)Google Scholar
  12. Kushiro, I.: Clinopyroxene solid solutions formed by reactions between diopside and plagioclase at high pressure. Min. Soc. Am. Spec. Pap. 2, 179–191 (1969)Google Scholar
  13. Kushiro, I., Yoder, H.S.: Anorthite-forsterite and anorthite enstatite reactions and their bearings on the basalt-eclogite transformation. J. Petrol., 5, 195–218 (1966)Google Scholar
  14. Leake, B.E.: A catalog of analysed calciferous and subcalciferous amphiboles together with their nomenclature and associated minerals. Geol. Soc. Am. Spec. Pap. 98 (1968)Google Scholar
  15. McLelland, J.M., Whitney, P.R.: The origin of garnet in the anorthosite-charnockite suite of the Adirondacks. Contrib. Mineral. Petrol., 60, 161–181 (1977)Google Scholar
  16. Mori, T., Jakes, P., Nageoka, M.: Major element analyses of silicate rocks using the electron probe microanalyser. Sci. Rep. Kanazawa Univ., 16, 2, 113–120 (1971)Google Scholar
  17. Nakamura, Y., Coombs, D.S.: Clinopyroxenes in the Tawhiroko dolerite at Moerake, North-eastern Otago, New Zealand. Contrib. Mineral. Petrol., 42, 213–228 (1973)Google Scholar
  18. Oliver, G.J.H.: Gravity anomalies and the structure of Fiordland: Comment. N. Z. Jl. Geol. Geophys., 16, 307–310 (1973)Google Scholar
  19. Oliver, G.J.H.: The high grade metamorphic rocks of Doubtful Sound, Fiordland, New Zealand: A study of the lower crust. Ph. D. thesis held by Otago University Library, Dunedin, New Zealand 1976Google Scholar
  20. Peck, L.C.: Systematic analysis of silicates. U.S. Geol. Surv. Bull, 1170. U.S. Govt. Printing Office, Washington, 1964Google Scholar
  21. Raase, P.: Aluminium and titanium contents of hornblende indicators of pressure and temperature of regional metamorphism. Contrib. Mineral. Petrol., 45, 231–236 (1974)Google Scholar
  22. Raheim, A., Green, D.H.: Experimental determination of the temperature and pressure dependence of Fe-Mg partition between coexisting garnet and clinopyroxene. Contrib. Mineral. Petrol., 48, 179–203 (1975)Google Scholar
  23. Secor, D.T, Jr.: Role of fluid pressure in jointing. Am. J. Sci., 263, 633–646 (1965)Google Scholar
  24. Thomas, W.K.L.: Standard geochemical sample T-1 supplement 1. Msusule Tonalite. Geol. Survey division of the Ministry of Commerce and Industry. Govt. Printer. Dar es Salaam, 1963Google Scholar
  25. Turner, F.J.: Hornblende gneisses, marbles and associated rocks from Doubtful Sound, Fiordland. Trans. Roy. Soc. N. Z., 69, 570–598, 1939Google Scholar
  26. Turner, F.J.: Mineralogical and structural evolution of the metamorphic rocks. Geol. Soc. Am. Mem., 30, p. 342 (1948)Google Scholar
  27. Turner, F.J.: Mineral assemblages and of individual facies. In: Metamorphic reactions and metamorphic facies (W.S. Fyfe et al.), Geol. Soc. Am. Mem., 73, 199–239 (1958)Google Scholar
  28. Turner, F.J.: Metamorphic petrology, mineralogical and field aspects. McGraw Hill Inc., p. 403, 1968Google Scholar
  29. Tuttle, O.F., Bowen, N.L.: Origin of granite in the light of experimental studies in the system NaAlSi3O8-KAlSi3O8-SiO2-H2O. Geol. Soc. Am. Mem., 74, p. 153 (1958)Google Scholar
  30. Wilson, A.D.: A new method for the determination of ferrous iron in rocks and minerals. Bull. Geol. Surv. G. B. No. 8, 56–58 (1955)Google Scholar
  31. Wood, B.J., Banno, S.: Garnet-orthopyroxene and orthopyroxene-clinopyroxene relationships in simple and complex systems. Contrib. Mineral. Petrol., 42, 109 (1973)Google Scholar
  32. Woodward, D.J.: Gravity anomalies and the structure of Fiordland, south-west New Zealand. N. Z. Jl. Geol. Geophys., 15, 22–32 (1972)Google Scholar
  33. Yoder, H.S., Tilley, C.E.: Origin of basaltic magmas: an experimental study of natural and synthetic rock systems. J. Petrol., 3, 342–532 (1962)Google Scholar

Copyright information

© Springer-Verlag 1977

Authors and Affiliations

  • G. J. H. Oliver
    • 1
  1. 1.Department of GeologyOtago UniversityDunedinNew Zealand

Personalised recommendations