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Melt-enhanced deformation during emplacement of gabbro and granodiorite in the Sunnhordland Batholith, west Norway

Published online by Cambridge University Press:  01 May 2009

Torgeir B. Andersen ,
Peter Nielsen ,
Erling Rykkelid  and
Hanne Sølna
Torgeir B. Andersen
Affiliation:
Geological Institute, University of Oslo, P.O. Box 1047, 0316 Blindern Oslo 3, Norway
Peter Nielsen
Affiliation:
Geological Institute, University of Oslo, P.O. Box 1047, 0316 Blindern Oslo 3, Norway
Erling Rykkelid
Affiliation:
Geological Institute, University of Oslo, P.O. Box 1047, 0316 Blindern Oslo 3, Norway
Hanne Sølna
Affiliation:
Geological Institute, University of Oslo, P.O. Box 1047, 0316 Blindern Oslo 3, Norway
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Abstract

The Caledonian Sunnhordland Batholith comprises calc-alkaline plutons that have been assigned to three units according to their relative age and composition: a gabbro-diorite unit, a granodiorite unit and a later granodiorite-granite unit. The batholith was emplaced into an envelope including ophiolite and island-arc complexes, sediments and volcanites of early Ordovician age that were developed in a zone of plate convergence. Continued convergence resulted in the formation of a mature magmatic arc and a thickened crust; the late granitoids (unit 3), which commenced their crystallization at pressures around 6 to 7 kb, rose as permitted diapiric intrusions. The ingress and ascent of the magmas in this setting is considered to have been facilitated by the presence of major shear zones developed in relation to plate convergence. In this model, plastic instabilities were formed in an otherwise elastic middle and upper crust. Non-coaxial deformation was accelerated by the emplacement of magmas and the formation of abundant partial melts in water-rich sediments of the envelope. The deformation, which was accelerated by magma and melt lubrication in aureoles, controlled both the shape and internal structure in the gabbro and granodiorite plutons.

Type
Articles
Information
Geological Magazine , Volume 128 , Issue 3 , May 1991 , pp. 207 - 226
Copyright
Copyright © Cambridge University Press 1991

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References

Andersen, T. B. 1989. Syn-deformational emplacement of plutons in the Caledonian Sunnhordland Batholith, W. Norway. Geologiska Föreningen i Stockholms Föorhandlingar, 111, 375–78.CrossRefGoogle Scholar
Andersen, T.B & Jansen, V. J. 1987. The Sunnhordland Batholith W. Norway: Regional setting and internal structure, with emphasis on the granitoid plutons. Norsk Geologisk Tidsskrift, 67, 159–83.Google Scholar
Arzi, A. A. 1978. Critical phenomena in the rheology of partially melted rocks. Tectonophysics, 44, 173–84.CrossRefGoogle Scholar
Berger, A. R. 1971. The origin of banding in the Main Donegal Granite. Geological Journal, 7, 437–58.CrossRefGoogle Scholar
Blumenfeld, P. & Bouchez, J.-L. 1988. Shear criteria in granite and migmatite deformed in the magmatic and solid states. Journal of Structural Geology, 10, 361–72.CrossRefGoogle Scholar
Brekke, H., Furnes, H., Nordås, J. & Hertogen, J. 1984. Lower Palaeozoic convergent plate margin volcanism on Bømlo, SW Norway, and its bearing on the tectonic environments of the Norwegian Caledonides. Journal of the Geological Society of London, 141, 1015–32.CrossRefGoogle Scholar
Castro, A. 1986. Structural pattern and ascent model in the Central Extramadura batholith, Herzynian belt, Spain. Journal of Structural Geology, 8, 633–45.CrossRefGoogle Scholar
Crowell, J. C. 1974. Origin of late Cenozoic basins in southern Calefornia. In Tectonics and sedimentation. Society of Economic Paleontologists and Mineralogist Special Publication 22, 190–204.CrossRefGoogle Scholar
Den Tex, E. 1969. Origin of ultramafic rocks. Their tectonic setting and history. Tectonophysics, 7, 457–88.Google Scholar
Espensen, K. H. 1978. Coronites from the Fongen gabbro complex, Trondheim Region, Norway: role of water in the olivine plagioclase reaction. Neues Jahrbuch für Mineralogie. Abhandlungen, 132, 113–35.Google Scholar
Ferguson, C. C. 1979. Rotations of elongate rigid particles in slow non-newtonian flows. Tectonophysics, 60, 247–62.CrossRefGoogle Scholar
Fossen, H. 1988. Metamorphic history in the Bergen Arcs, Norway, as determined from amphibole chemistry. Norsk Geologisk Tidsskrift, 68, 223–39.Google Scholar
Fossen, H. & Austrheim, H. 1988. Age of the Krossnes Granite, West Norway. Norges geologiske undersøkelse, 413, 61–5.Google Scholar
Furnes, H., Austrheim, H., Amaliksen, K. G. & Nordås, J. 1983. Evidence for an incipient early Caledonian (Cambrian) orogenic phase in southwestern Norway. Geological Magazine, 120, 607–12.CrossRefGoogle Scholar
Gay, N. C. 1968. Pure and simple shear deformation of inhomogeneous viscous fluids. 2. The determination of the total finite strain in a rock from objects such as deformed pebbles. Tectonophysics, 5, 295–302.CrossRefGoogle Scholar
Griffin, W. T. & Heier, K. S. 1973. Petrological implications of some corona structures. Lithos, 6, 315–35.CrossRefGoogle Scholar
Guineberteau, B., Bouchez, J. -L. & Vigneresse, J.-L. 1987. The Montagne granite pluton (France) emplaced by pull-apart along a shear zone: Structural and gravimetric arguments and regional implication. Geological Society of America Bulletin, 99, 763–70.2.0.CO;2>CrossRefGoogle Scholar
Holdaway, M. J. & Lee, S. M. 1977. Fe-Mg Cordierite stability in high-grade pelitic rocks based on experimental, theoretical and natural observations. Contibutions to Mineralogy and Petrology, 63, 175–98.CrossRefGoogle Scholar
Hollister, L. S. & Crawford, M. L. 1986. Melt-enhanced deformation: A major tectonic process. Geology, 14, 558–61.2.0.CO;2>CrossRefGoogle Scholar
Hutton, D. H. W. 1982. A tectonic model for the emplacement of the Main Donegal Granite, NW Ireland. Journal of the Geological Society of London, 139, 615–31.CrossRefGoogle Scholar
Hutton, D. H. W. 1988 a. Igneous emplacement in a shear-zone termination: The biotite granite at Strontian, Scotland. Bulletin of the Geological Society of America, 100, 1392–99.2.3.CO;2>CrossRefGoogle Scholar
Hutton, D. H. W. 1988 b. Granite emplacement mechanisms and tectonic controls: inferences from deformations studies. Transactions of the Royal Society of Edinburgh: Earth Sciences, 79, 245–55.CrossRefGoogle Scholar
Ildefonse, B. & Fernandez, A. 1988. Influence of the concentration of rigid markers in a viscous medium on the production of preferred orientations. An experimental contribution, 1. Non-coaxial strain. Bulletin of the Geological Institutions of the University of Uppsala, N.S. 14, 55–60.Google Scholar
Lippard, S. J. 1976. Preliminary investigations of some Ordovician volcanics from Stord, West Norway, Norges geologiske undersøkelse, 327, 41–66.Google Scholar
Mehnert, K. R. 1968. Migmatites Amsterdam: Elsevier, 405 pp.Google Scholar
Naney, M. T. 1983. Phase equilibria of rock-forming ferromagnesian silicates in granitic systems. American Journal of Science, 283, 993–1033.CrossRefGoogle Scholar
Nielsen, P. E. & Andersen, T. B. 1990. Skjærbevegelser lokalisert til smalte-rike deler av en migmatitt (Bømlo, Sunnhordland, Norge). Geonytt, 1–90, (Abstract) p. 83.Google Scholar
Nordås, J., Amaliksen, K. G., Brekke, R., Furnes, H., Sturt, B. A. & Robins, B. 1985. Lithostratigraphy and petrochemistry of Caledonian rocks on Bømlo, SW Norway. In The Caledonide Orogen – Scandianvia and Related Areas, (eds. Gee, D. G. & Sturt, B. A.), pp. 679–92. New York: J. Wiley & Sons.Google Scholar
Ord, A. & Hobbs, B. E. 1989. The strength of the continental crust, detachment zones and the development of plastic instabilities. Tectonophysics, 158, 269–89.CrossRefGoogle Scholar
Patterson, S. R., Vernon, R. H. & Tobisch, O. T. 1989. A review of criteria for the identification of magmatic and tectonic foliations in granitoids. Journal of Structural Geology, 11, 349–63.CrossRefGoogle Scholar
Pedersen, R. B., Furnes, H. & Dunning, G. 1988. Some Norwegian ophiolite complexes reconsidered. Norges geologiske undersøkelse, Special Publications, 3, 80–85.Google Scholar
Pedersen, R. B. & Dunning, G. 1991. U/Pb dateringer av øybuemagmatisme innenfor det sørvest-norske ofiolitt-terreng. Geonytt 1–91 (abstract), pp. 42–3.Google Scholar
Pitcher, W. S. & Berger, A. R. 1972. The Geology of Donegal. A Study of Granite Emplacement and Unroofing. New York: J. Wiley & Sons, Wiley-Interscience, 433 pp.Google Scholar
Ramsay, J. G. 1967. Folding and Fracturing of rocks. New York: McGraw-Hill, 568 pp.Google Scholar
Ramsay, J. G. 1989. Emplacement kinematics of a granite diapir: the Chindamora batholith, Zimbabwe. Journal of Structural Geology, 11, 191–209.CrossRefGoogle Scholar
Ryan, P. D. & Skevington, D. 1976. A reinterpretation of the late Ordovician – early Silurian stratigraphy of the Dyvikvågen and Ulven-Vaktdal areas, Hordaland W. Norway. Norges geologiske undersøkelse, 324, 1–20.Google Scholar
Rykkelid, E. 1986. Geologisk utvikling i Møkster-Selbjørn området, Sunnhordland. Geolognytt, 21, (Abstract), 51.Google Scholar
Sølna, H. & Andersen, T. B. 1988. Evidence for syn-magmatic shear deformation in relation to the emplacement of the Reksteren Granodiorite, Sunnhord-land, W. Norway. Intern skriftserie, Institutt for Geologi University of Oslo 54, (Abstract), 39–40.Google Scholar
Talbot, C. J. 1970. The minimum strain ellipsoid using deformed quartz veins. Tectonophysics, 9, 47–76.CrossRefGoogle Scholar
Thon, A., Magnus, C. & Breivik, H. 1981. The stratigraphy of the Dyvikvågen Group, Stord: A revision. Norges geologiske undersøkelse, 359, 31–42.Google Scholar
Van der Molen, I. & Paterson, M. S. 1979. Experimental deformation of partially-melted granite. Contributions to Mineralogy and Petrology, 70, 299–318.CrossRefGoogle Scholar
Wickham, S. M. 1987. The segregation and emplacement of granitic magmas. Journal of the Geological Society of London, 144, 281–97.CrossRefGoogle Scholar
Zen, E-an. 1989. Plumbing the depths of batholiths. American Journal of Science, 289, 1137–57.CrossRefGoogle Scholar
Zen, E-an & Hammarstrøm, J. M. 1984. Magmatic epidote and its petrologic significance. Geology, 12, 515–18.2.0.CO;2>CrossRefGoogle Scholar