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Phase equilibrium constraints on the viscosity of silicic magmas II: implications for mafic–silicic mixing processes

Published online by Cambridge University Press:  03 November 2011

Bruno Scaillet ,
Alan Whittington ,
Caroline Martel ,
Michel Pichavant  and
François Holtz
Bruno Scaillet
Affiliation:
Institut des Sciences de la Terre d'Orléans, CNRS. 1A rue de la Férollerie, 45071 Orléans cedex 02, France; e-mail:[email protected]
Alan Whittington*
Affiliation:
IPG, 4 place Jussieu, Paris cedex 5, 75252, France
Caroline Martel
Affiliation:
Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany; and Institut des Sciences de la Terre d'Orléans, CNRS, 1A rue de la Férollerie, 45071 Orléans cedex 02, France
Michel Pichavant
Affiliation:
Institut des Sciences de la Terre d'Orléans, CNRS, 1A rue de la Férollerie, 45071 Orléans cedex 02, France
François Holtz
Affiliation:
Institut für Mineralogie, Welfengarten 1, D-30167 Hannover, Germany
*
Present address: Department of Geology, University of Illinois, 1301 W. Green Street, Urbana, IL 61801, USA
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Abstract

Isobaric crystallisation paths obtained from phase equilibrium experiments show that, whereas in rhyolitic compositions melt fraction trends are distinctly eutectic, dacitic and more mafic compositions have their crystallinities linearly correlated with temperatures. As a consequence, the viscosities of the latter continuously increase on cooling, whereas for the former they remain constant or even decrease during 80% of the crystallisation interval, which opens new perspectives for the fluid dynamical modelling of felsic magma chambers. Given the typical dyke widths observed for basaltic magmas, results of analogue modelling predict that injection of mafic magmas into crystallising intermediate to silicic plutons under pre-eruption conditions cannot yield homogeneous composition. Homogenisation can occur, however, if injection takes place in the early stages of magmatic evolution (i.e. at near liquidus conditions) but only in magmas of dacitic or more mafic composition. More generally, the potential for efficient mixing between silicic and mafic magmas sharing large interfaces at upper crustal levels is greater for dry basalts than for wet ones. At the other extreme, small mafic enclaves found in many granitoids behave essentially as rigid objects during a substantial part of the crystallisation interval of the host magmas, which implies that finite strain analyses carried out on such markers can give only a minimum estimate of the total amount of strain experienced by the host pluton. Mafic enclaves carried by granitic magmas behave as passive markers only at near solidus conditions, typically when the host granitic magma shows near-solid behaviour. Thus they cannot be used as fossil indicators of direction of magmatic flow.

Keywords

andesitebasaltdacitegraniterhyolite
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 91 , Issue 1-2: Fourth Hutton Symposium: The Origin of Granites and Related Rocks , 2000 , pp. 61 - 72
Copyright
Copyright © Royal Society of Edinburgh 2000

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References

Arzi, A. A. 1978. Critical phenomena in the rheology of partially melted rocks. Tectonophysics 44, 173–84.Google Scholar
Atherton, M. P.& Petford, N. 1993. Generation of sodium-rich magmas from newly underplated basaltic crust. Nature 362, 144–46.Google Scholar
Bacon, C. R. 1986. Magmatic inclusions in silicic and intermediate volcanic rocks. Journal Geophysical Research 91, 6091–112.Google Scholar
Bagdassarov, N. S.& Dingwell, D. B. 1992. Rheological investigations of vesicular rhyolite. Journal of Volcanology and Geothermal Research 50, 307–22.Google Scholar
Baker, D. B. 1998. Granitic melt viscosity and dike formation Journal of Structural Geology 20, 1395–1404.Google Scholar
Baker, D. B.& Vaillancourt, J. 1995. The low viscosities of F + H2O- bcaring granitic melts and implications for melt extraction and transport. Earth and Planetary Science Letters 132, 199–211.Google Scholar
Barbarin, B.& Didier, J. 1992. Genesis and evolution of mafic microgranular enclaves through various types of interaction between coexisting felsic and mafic magmas. Transactions of the Royal Society of Edinburgh: Earth Sciences 83, 145–53.Google Scholar
Bottinga, Y.& Weill, D. F. 1972. The viscosity of magmatic liquids: a model for calculations. American Journal of Science 272, 438–75.Google Scholar
Brandeis, G.& Jaupart, C. 1986. On the interaction between convection and crystallization in cooling magmas chambers. Earth and Planetary Science Letters 11, 345–61.Google Scholar
Campbell, I. H.& Turner, J. S. 1986. The influence of viscosity on fountains in magma chambers. Journal of Petrology 27, 1–30.Google Scholar
Clemens, J. D.& Wall, Y. J. 1981. Crystallization and origin of some peraluminous (S-type) granitic magmas. Canadian Mineralogist 19, 111–31.Google Scholar
Clemens, J. D.& Mawer, C. K. 1992. Granitic magma transport by fracture propagation. Tectonophysics 204, 339–60.Google Scholar
Coulon, C., Clocchiatti, R.. Maury, R. C.& Westercamp, D. 1984. Petrology of basaltic xenoliths in andesitic to dacitic host lavas from martinique (Lesser Antilles): evidence for magma mixing. Bulletin of Volcanology 47, 705–34.Google Scholar
Dall'Agnol R., Scaillet, B.& Pichavant, M. 1999. An experimental study of a lower proterozoic A-type granite from the Eastern Amazonian Craton, Brazil. Journal of Petrology 40, 1673–98.Google Scholar
Debon, F. 1991. Comparative major element chemistry in various ‘microgranular enclave-plutonic host’ pairs. In Didier, J.& Barbarin, B. (eds) Enclaves and granite petrology. Developments in Petrology 13, 293–312. Amsterdam: Elsevier.Google Scholar
Dell'Angelo, L. N.& Tullis, J. 1988. Experimental deformation of partially melted granitic aggregates. Journal of Metamorphic Geology 6, 495–515.Google Scholar
Dingwell, D. B., Bagdassarov, N. S., Bussod, J.& Webb, S. L. 1993. Magma rheology. In Luth, R.W. (ed.) Short Handbook on Experiments at High Pressure and Applications to the Earth's Mantle, vol. 21, 131–96. Ontario: Mineralogical Association of Canada.Google Scholar
Dingwell, D. B., Romano, C.& Hess, K. U. 1996. The effect of water on the viscosity of a haplogranitic melt under P–T–X conditions relevant to silicic volcanism. Contributions to Mineralogy and Petrology 124, 19–28.Google Scholar
Dingwell, D. B.& Webb, S. L. 1990. Relaxation in silicate melts. European Journal of Mineralogy 2, 427–49.Google Scholar
Eichelberger, J. 1975. Origin of andesite and dacite: evidence of mixing at Glass Mountain in California and at other circum-Pacific volcanoes. Geological Society of America Bulletin 86, 1381–91.Google Scholar
Feeley, T. C.& Dungan, M. A. 1996. Compositional and dynamic controls on mafic-silicic magma interactions at continental arc volcanoes: evidence from Cordon El Guadal, Tatara-San Pedro complex, Chile. Journal of Petrology 37, 1547–77.Google Scholar
Fernandez, A. N.& Gasquest, D. 1994. Relative rheological evolution of chemically contrasted coeval magmas: example of the Tichka plutonic complex (Morocco). Contributions to Mineralogy and Petrology 116, 316–26.Google Scholar
Frost, T. P.& Mahood, G. A. 1987. Field, chemical, and physical constraints on mafic-felsic interactions in the Lamarck granodiorite, Sierra Nevada, California. Geological Society of America Bulletin 99, 272–91.Google Scholar
Hess, K. U.& Dingwell, D. B. 1996. Viscosities of hydrous leucogranitemelts: A non-arrhenian model. American Mineralogist 81, 1297–300.Google Scholar
Hogan, J. P.& Gilbert, M. C. 1995. The A-type Mount Scott granite sheets: Importance of crustals magmas traps. Journal of Geophysical Research 100, 15, 779–92.Google Scholar
Holtz, F., Roux, J., Ohlhorst, S., Behrens, H.& Schulze, F. 1999. The effects of silica and water on the viscosity of hydrous quartzfeldspathic melts. American Mineralogist 84, 27–36.Google Scholar
Huppert, H. E.& Sparks, R. J. S. 1988. The generation of granitic magmas by intrusion of basalt into continental crust. Journal of Petrology 29, 599–624.Google Scholar
Jellinek, A. M.& Kerr, R. C. 1999. Mixing and compositional stratification produced by natural convection. 2. Applications to the differentiation of basaltic and silicic magma chambers and komatiitc lava flows. Journal of Geophysical Research 104, 7203–18.Google Scholar
John, B.E.& Blundy, J.E. 1993. Emplacement-related deformation of granitoid magmas, southern Adamello Massif, Italy. Geological Society of America Bulletin 105, 1517–41.Google Scholar
Kouchi, A., Tsuchiyama, A.& Sunagawa, I. 1986. Effects of stirring on crystallisation kinetics of basalt: texture and clement partitioning. American Mineralogist 93, 429–38.Google Scholar
Kushiro, I. 1976. Viscosities of basalt and andesite melts at high pressures. Journal of Geophysical Research 81, 6351–6.Google Scholar
Lange, R. A. 1994. The effect of H2O, CO2 and F on the density and viscosity of silicate melts. In Carroll, M. R.& Holloway, J. R. (eds) Volatiles in Magmas, Reviews in Mineralogy 30, 331–69. Washington, D.C.: Mineralogical Society of America.Google Scholar
Lejeune. A. & Richet, P. 1995. Rheology of crystal-bearing silicate melts: An experimental study at high viscosities. Journal of Geophysical Research 100, 4215–29.Google Scholar
Luhr, J. F. 1990. Experimental phase relations of water- and sulfursaturated arc magmas and the 1982 eruptions of El Chichon volcano. Journal of Petrology 31, 1071–114.Google Scholar
Marsh, B. 1981. On the crystallinity, probability of occurrence and rheology of lava and magma. Contributions to Mineralogy and Petrology 78, 85–98.Google Scholar
Marsh, B. 1989. On the convective style and vigour in sheet-like magma chambers. Journal of Petrology 30, 479–530.Google Scholar
Martel, C., Pichavant, M., Bourdier, J. L., Traineau, H., Holtz, F.& Scaillet, B. 1998. Magma storage and control of eruption regime in silicic volcanoes: experimental evidence from Mt Pelée. Earth and Planetary Science Letters 156, 89–99.Google Scholar
Martel, C. Pichavant, M., Boardier, J. L., Traineau, H., Holtz, F.& Scaillet, B. 1999. Effects of fO2 and H2O on andesite phase relations between 2 and 4 kbar. Journal of Geophysical Research 104, 29, 453–70.Google Scholar
McKenzie, D. P. 1984. The generation and compaction of partially molten rocks. Journal of Petrology 25, 713–65.Google Scholar
Michael, P. J. 1991. Intrusion of basaltic magma into a crystallizing granitic magma chamber: the Cordillera del Paine pluton in southern Chile. Contributions to Mineralogy and Petrology 108, 396–418.Google Scholar
Nixon, G. T. 1988. Petrology of the younger andesites and dacites of Iztaccihuatl volcano, Mexico: II. Chemical composition of basaltic magma influx. Journal of Petrology 29, 265–303.Google Scholar
Pallister, J. S., Hoblitt, R. P.& Agnes, R. G. 1992. A basalt trigger for the 1991 eruptions of Pinatubo volcano? Nature 356, 426–8.Google Scholar
Paquet, J.& Francois, P. 1980. Experimental deformation of partially melted granitic rocks at 600-900°C and 250 MPa confining pressure. Tectonophysics 68, 131–46.Google Scholar
Petford, N. 1993. Porous media flow in granitoid magmas: an assessment. In Stone, D.B.& Runcorn, S.K. (eds) Flow and creep in the solar system: Observations, modeling and theory, 262–86. Dordrecht: Kluwer.Google Scholar
Pichavant, M., Martel, C., Bourdier, J. L.& Scaillet, B. 2001. P–T–fO2–H2O conditions, structure and dynamics of a zoned magma chamber: Mt Pelée (Martinique, Lesser Antilles Arc). Journal of Geophysical Research (in press).Google Scholar
Pinkerton, H.& Norton, G. 1995. Rheological properties of basaltic lavas at sub-liquidus temperatures: laboratory and field measurements on lavas from Mount Etna Journal of Volcanology and Geothermal Research 68, 307–23.Google Scholar
Richet, P. 1984. Viscosity and configurational entropy of silicate melts. Geochimica et Cosmochimica Acta 48, 471–83.Google Scholar
Richet, P., Lejeune, A. M., Holtz, F.& Roux, J. 1996. Water and the viscosity of andesite melts. Chemical Geology 128, 185–97.Google Scholar
Roux, J., Holtz, F., Lefevre, A.& Schulze, F. 1994. A reliable high temperature setup for internally heated pressure vessels: applications to silicate melt studies. American Mineralogist 79, 1145–49.Google Scholar
Rushmer, T. 1995. An experimental deformation study of partially molten amphibolite: Application to low-melt fraction segregation. Journal of Geophysical Research 100, 15,681–95.Google Scholar
Rutherford, M. J., Sigurdsson, H., Carey, S.& Davis, A. 1985. The May 18, 1980, eruption of Mount St Helens 1. Melt composition and experimental phase equilibria. Journal of Geophysical Research 90, 2929–47.Google Scholar
Rutherford, M. J& Devine, J. D. 1996. Pre-eruption pressure-temperature conditions and volatiles in the 1991 Mount Pinatubo magma. In Newhall, C. G.& Punongbayan, R. S. (eds) Fire and Mud. Eruptions and Lahars of Mount Pinatubo, Philippines, 751–66. Washington D.C.: University of Washington Press.Google Scholar
Rutter, E. H.& Neumann, D. H. K. 1995. Experimental deformation of partially molten Westerly granite under fluid absent conditions, with implications for the extraction of granitic magmas. Journal of Geophysical Research 100, 15,697–715.Google Scholar
Scaillet, B., Pichavant, M.& Roux, J. 1995. Experimental crystallization of leucogranite magmas, Journal of Petrology 36, 664–706.Google Scholar
Scaillet, B., Holtz, F., Pichavant, M.& Schmidt, M. 1996. Viscosity of Himalayan leucogranites: Implications for mechanisms of granitic magma ascent. Journal of Geophysical Research 101, 27,691–9.Google Scholar
Scaillet, B., Holtz, F.& Pichavant, M. 1997. Rheological properties of granitic magmas in their crystallization range. In Bouchez, J. L., Hutton, D.& Stephens, W. E. (eds) Granite: from segregation of melt to emplacement fabrics 11–29. Dordrecht: Kluwer.Google Scholar
Scaillet, B., Holtz, F.& Pichavant, M. 198a. Phase equilibrium constraints on the viscosity of silicic magmas. 1. Volcanic-plutonic comparison. Journal of Geophysical Research 103, 27,257–66.Google Scholar
Scaillet, B., Clemente, B. Evans, B. W.& Pichavant, M. 1998b. Redox control of sulfur degassing in silicic magmas. Journal of Geophysical Research 103, 23,937–49.Google Scholar
Scaillet, B.& Evans, B. W. 1999. The June 15, 1991 eruption of Mount Pinatubo. I. Phase equilibria and pre-eruption P–T–fO2O conditions of the dacite magma. Journal of Petrology 40, 381–411.Google Scholar
Scaillet, B.& Macdonald, R. 2000. Phase relations of peralkaline silicic magmas and petrogenetie implications. Journal of Petrology (in press).Google Scholar
Schulze, F., Behrens, H., Holtz, F., Roux, J.& Johannes, W. 1996. The influence of water on the viscosity of a haplogranite liquid. American Mineralogist 81, 1155–65.Google Scholar
Shaw, H. R. 1969. Rheology of basalt in the melting range. Journal of Petrology 10, 510–35.Google Scholar
Shaw, H. R. 1972. Viscosities of magmatic silicate liquid: an empirical method of prediction. American Journal of Science 272, 870–93.Google Scholar
Sisson, T. W.& Grove, T. L. 1993a. Temperatures and H2O contents of low-MgO high alumina basalts. Contributions to Mineralogy and Petrology 113, 143–66.Google Scholar
Sisson, T. W.& Grove, T. L. 1993b. Experimental investigations of the role of H2O in calc-alkaline differentiation and subduction zone magmatism. Contributions to Mineralogy and Petrology 113, 167–84.Google Scholar
Sisson, T. W.& Layne, G. D. 1993. H2O in basalt and basaltic andesite glass inclusions from four subduction-related volcanoes. Earth and Planetary Science Letters 117, 619–35.Google Scholar
Snyder, D.& Tait, S. 1995. Replenishment of magma chambers: comparison of fluid-mechanic experiments with field. Contributions to Mineralogy and Petrology 122, 230–40.Google Scholar
Sobolev, A. V.& Chaussidon, M. 1996. H2O concentrations in primary melts from supra-subduction zones and mid-ocean ridges: Implications for H2O storage and recycling in the mantle. Earth and Planetary Science Letters 137, 45–55.Google Scholar
Sparks, R. J. S., Sigurdsson, H.& Wilson, L. 1977. Magma mixing: A mechanism for triggering acid explosive eruption. Nature 267, 315–18.Google Scholar
Sparks, R. J. S.& Marshall, L. A. 1986. Thermal and mechanical constraints on mixing between mafic and silicic magmas. Journal of Volcanology and Geothermal Research 29, 99–129.Google Scholar
Spera, F. J. 1980. Thermal evolution of plutons, a parametrized approach. Science 207, 299–301.Google Scholar
Spera, F. J., Yuen, D. A.& Kirshvink, S. J. 1982. Thermal boundary layer convection in silicic magma chambers: effects of temperature dependent rheology and implications for thermogravitational chemical fractionation. Journal of Geophysical Research 87, 8755–67.Google Scholar
Stein, D. J.& Spera, F. J. 1992. Rheology and microstructure of magmatic emulsions. Theory and experiments. Journal of Volcanology and Geothermal Research 49, 157–74.Google Scholar
Stevenson, R. J., Dingwell, D. B., Webb, S. L.& Sharp, T. G. 1996. Viscosity of microlite-bearing rhyolitic obsidians: an experimental study. Bulletin of Volcanology 58, 298–309.Google Scholar
van der Molen, I.& Paterson, M. S. 1979. Experimental deformation of partially melted granite. Contributions to Mineralogy and Petrology 70, 299–318.Google Scholar
Wada, Y. 1994. On the relationship between dike width and magma viscosity. Journal of Geophysical Research 99, 17,743–55.Google Scholar
Wall, V. J., Clemens, J. C.& Clarke, D. B. 1987. Models of granitoid evolution and source compositions. Journal of Geology 95, 731–49.Google Scholar
Wallace, P. J., Anderson, A. T.& Davis, A. M. 1995. Quantification of pre-eruptive exsolved gas contents in silicic magmas. Nature 377, 612–16.Google Scholar
Watson, E. B. 1981. Diffusion in magmas at depth in the Earth: the effect of pressure and dissolved H2O. Earth and Planetary Science Letters 52, 291–301.Google Scholar
Webb, S. L.& Dingwell, D. B. 1990. Non-newtonian rheology of igneous melts at high stresses and strain rates: Experimental results for rhyolite, andesite, basalt and nephelinite. Journal of Geophysical Research 95, 15,695–701.Google Scholar
Wiebe, R. A. 1994. Silicic magma chambers as traps for basaltic magmas: the Cadillac Mountain intrusive complex, Mount Desert Island, Maine. Journal of Geology 102, 423–37.Google Scholar
Whitney, J. A. 1988. The origin of granite: The role and source of water in the evolution of granitic magmas. Geological Society of America Bulletin 100, 1886–97.Google Scholar
Whittington, A., Richet, P., Linard, Y.& Holtz, F. 2000a. The viscosity of hydrous phonolites and trachytes. Chemical Geology (in press).Google Scholar
Whittington, A., Richet, P.& Holtz, F. 2000b. Water and the viscosity of depolymerized aluminosilicate melts. Geochimica et Cosmochimica Acta 64, 3725–36.Google Scholar
Williams, Q.& Tobisch, O. T. 1994. Merogranitic enclave shapes and magmatic strain histories: Constraints from drop deformation theory. Journal of Geophysical Research 99, 24, 359–78.Google Scholar