Contributions to Mineralogy and Petrology

, Volume 86, Issue 2, pp 189–199 | Cite as

The origin of brown hornblende in the Artfjället gabbro and dolerites

  • Max T. Otten


Brown hornblende occurs in minor amounts in the Artfjället gabbro and dolerites, except in quartz-dolerites where a pale green hornblende occurs. In the gabbro, brown hornblende is mostly Ti-bearing pargasite or kaersutite. It occurs along veins of orthopyroxene, as rims around and blebs in pyroxenes, with orthopyroxene in coronas between olivine and plagioclase and in coronas between ilmenite and plagioclase. In the olivine-dolerites and orthopyroxene-dolerites brown hornblende is ferroan titanian pargasite or ferroan kaersutite. The pale green hornblende in the quartz-dolerites is a magnesio-hornblende. The hornblendes in the dolerites are interstitial or granular, in some dolerites occurring as coarse oikocrysts. It is proposed that under certain conditions the Ti content of hornblende can be used as a thermometer, derived from experimental data of Helz (1973). Microstructures, compositions and formation temperatures (< 1,040° C) show that the brown hornblende in the gabbro is not magmatic, but of subsolidus origin. Probably it formed as a result of the introduction of water into the gabbro during a deformation event that occurred early in the cooling history of the gabbro. Least-squares modelling of hornblende formation indicates that all magmatic minerals must have participated in the reaction and that the reaction probably was not isochemical. Microstructures, compositions and formation temperatures (1,030-965° C) of brown hornblende in the dolerites are consistent with late-stage crystallization from the magma. For the pale green hornblende in the quartz-dolerites a magmatic origin is likely, but cannot be proven.


Microstructure Experimental Data Crystallization Olivine Mineral Resource 
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  1. Allen JC, Boettcher AL, Marland G (1975) Amphiboles in andesite and basalt: I. Stability as a function of PT\(f_{O_2 } \). Am Mineral 60:1069–1085Google Scholar
  2. Allen JC, Boettcher AL (1978) Amphiboles in andesite and basalt: II. Stability as a function of PT\(f_{{\text{H}}_{\text{2}} {\text{O}}} \)\(f_{O_2 } \). Am Mineral 63:1074–1087Google Scholar
  3. Best MG, Mercy ELP (1967) Composition and crystallization of mafic minerals in the Guadelupe igneous complex, California. Am Mineral 52:436–474Google Scholar
  4. Cawthorn RG (1976) Melting relations in part of the system CaO- MgO-Al2O3-SiO2-Na2O-H2O under 5 kb pressure. J Petrol 17:44–72Google Scholar
  5. Cobbing EJ, Pitcher WS (1972) The coastal batholith of Central Peru. J Geol Soc London 128:421–460Google Scholar
  6. Czamanske GK, Wones DR (1973) Oxidation during magmatic differentiation, Finnmarka complex, Oslo area, Norway: Part 2, the mafic silicates. J Petrol 14:349–380Google Scholar
  7. Delaney JR, Muenow DW, Graham DG (1978) Abundance and distribution of water, carbon and sulfur in the glassy rims of submarine pillow basalts. Geochim Cosmochim Acta 42:581–594Google Scholar
  8. Dodge FCW, Papike JJ, Mays RE (1968) Hornblendes from granitic rocks of the Central Sierra Nevada batholith, California. J Petrol 9:378–410Google Scholar
  9. Gilbert MC, Helz RT, Popp RK, Spear FS (1982) Experimental studies of amphibole stability. Reviews in Mineralogy, 9B, Amphiboles: petrology and experimental phase relations, Mineral Soc Am, 229–353Google Scholar
  10. Haggerty SE (1976) Opaque mineral oxides in terrestrial igneous rocks. Reviews in Mineralogy, 3, Oxide Minerals, Mineral Soc Am, ch 8Google Scholar
  11. Hashimoto S (1975) The basic plutonic rocks of the Hidaka metamorphic belt, Hokkaido. Part I. J Fac Sci Hokkaido Univ Ser IV, 16:367–420Google Scholar
  12. Helz RT (1973) Phase relations of basalts in their melting range at \(P_{{\text{H}}_{\text{2}} {\text{O}}} \)=5 kb as a function of oxygen fugacity. Part I. Mafic phases. J Petrol 14:249–302Google Scholar
  13. Helz RT (1976) Phase relations of basalts in their melting range at \(P_{{\text{H}}_{\text{2}} {\text{O}}} \)=5 kb Part II. Melt compositions. J Petrol 17:139–193Google Scholar
  14. Helz RT (1979) Alkali exchange between hornblende and melt: a temperature-sensitive reaction. Am Mineral 64:953–965Google Scholar
  15. Holloway JR (1973) The system pargasite-H2O-CO2: a model for melting of a hydrous mineral with a mixed-volatile fluid. I. Experimental results to 8 kbar. Geochim Cosmochim Acta 37:651–666Google Scholar
  16. Holloway JR, Burnham CW (1972) Melting relations of basalt with equilibrium water pressure less than total pressure. J Petrol 13:1–29Google Scholar
  17. Leake BE (1978) Nomenclature of amphiboles. Can Mineral 16, 501–520Google Scholar
  18. Le Maitre RW (1979) A new generalised petrological mixing model. Contrib Mineral Petrol 71:133–137Google Scholar
  19. Le Maitre RW (1980) GENMIX — a generalized petrological mixing model program. Comput Geosci 7:229–247Google Scholar
  20. Lindsley DH, Andersen DJ (1983) A two-pyroxene thermometer. Proc Lunar Planet Sci Conf 13:A887–906Google Scholar
  21. McSween HY Jr, Nystrom PG Jr (1979) Mineralogy and petrology of the Dutchmans Creek gabbroic intrusion, South Carolina. Am Mineral 64:531–545Google Scholar
  22. Morse SA (1980) Kiglapait mineralogy II: Fe Ti oxide minerals and the activities of oxygen and silica. J Petrol 21:685–719Google Scholar
  23. Mullan HS, Bussell MA (1977) The basic rock series in batholithic associations. Geol Mag 114:265–280Google Scholar
  24. Nicholls IA, Harris KL (1980) Experimental rare earth element partition coefficients for garnet, clinopyroxene and amphibole coexisting with andesitic and basaltic liquids. Geochim Cosmochim Acta 44:287–308Google Scholar
  25. Nishimori RK (1976) The petrology and geochemistry of gabbros from the Peninsular Ranges batholith, California, and a model for their origin. Unpubl PhD thesis, Univ California, San DiegoGoogle Scholar
  26. Otten MT (1983) The magmatic and subsolidus evolution of the Artfjället gabbro, Central Swedish Caledonides. Unpubl PhD thesis, Univ Utrecht, the Netherlands (copies available on request)Google Scholar
  27. Robinson P, Spear FS, Schumacher JC, Laird J, Klein C, Evans BW, Doolan BL (1982) Phase relations of metamorphic amphiboles: natural occurrence and theory. Reviews in Mineralogy, 9B, Amphiboles: petrology and experimental phase relations, Mineral Soc Am, 1–227Google Scholar
  28. Senior A, Otten MT (in press) The Artfjället gabbro and its bearing on the evolution of the Storfjället nappe, Central Swedish Caledonides. In: Gee DG, Sturt BA (eds) The Caledonide Orogen Scandinavia and related areas, WileyGoogle Scholar
  29. Snoke AW, Quick JE, Bowman HR (1981) Bear Mountain igneous complex, Klamath Mountains, California: an ultrabasic to silicic calc-alkaline suite. J Petrol 22:501–552Google Scholar
  30. Spear FS (1981) An experimental study of hornblende stability and compositional variability in amphibolite. Am J Sci 281:697–734Google Scholar
  31. Wager LR, Brown GM, Wadsworth WJ (1960) Types of igneous cumulates. J Petrol 1:73–85Google Scholar
  32. Wilson JR, Esbensen KH, Thy P (1981) Igneous petrology of the synorogenic Fongen-Hyllingen layered basic complex, South-Central Scandinavian Caledonides. J Petrol 22:584–627Google Scholar

Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Max T. Otten
    • 1
  1. 1.Vakgroep PMKGB, Instituut voor AardwetenschappenRijksuniversiteit UtrechtTA UtrechtThe Netherlands

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