Hostname: page-component-78c5997874-dh8gc Total loading time: 0 Render date: 2024-11-04T18:04:30.513Z Has data issue: false hasContentIssue false
  • English
  • Français

Control of redox state and Sr isotopic composition of granitic magmas: a critical evaluation of the role of source rocks

Published online by Cambridge University Press:  03 November 2011

Michel Pichavant ,
Tahar Hammouda  and
Bruno Scaillet
Michel Pichavant
Affiliation:
M. Pichavant & B. Scaillet. Centre de Recherche sur la Synthèse et la Chimie des Minéraux, CNRS, 1A rue de la Férollerie, 45071, Orléans, France
Tahar Hammouda
Affiliation:
T. Hammouda, Geophysical Laboratory, 5251 Broad Branch Road. N. W., Washington, DC 20015-1305, U.S.A.
Bruno Scaillet
Affiliation:
M. Pichavant & B. Scaillet. Centre de Recherche sur la Synthèse et la Chimie des Minéraux, CNRS, 1A rue de la Férollerie, 45071, Orléans, France
Get access Rights & Permissions [Opens in a new window]

Abstract:

The current underlying assumption in most geochemical studies of granitic rocks is that granitic magmas reflect their source regions. However, the mechanisms by which source rocks control the intensive and compositional parameters of the magmas remain poorly known. Recent experimental data are used to evaluate the ‘source rock model’ and to discuss controls of (1) redox states and (2) the Sr isotopic compositions of granitic magmas.

Experimental studies have been performed in parallel on biotite-muscovite and tourmaline-muscovite leucogranites from the High Himalayas. Results under reducing conditions ( = FMQ – 0·5) at 4 kbar and variable suggest that the tourmaline-muscovite granite evolved under progressively more oxidising conditions during crystallisation, up to values more than four log units above the FMQ buffer. Leucogranite magmas thus provide an example of the control of redox conditions by post-segregation rather than by partial melting processes.

Other experiments designed to test the mechanisms of isotopic equilibration of Sr during partial melting of a model crustal assemblage show that kinetic factors can dominate the isotopic signature in the case of source rocks not previously homogenised during an earlier metamorphic event. The possibility is therefore raised that partial melts may not necessarily reflect the Sr isotopic composition of their sources, weakening in a fundamental way the source rock model.

Keywords

mechanisms of partial meltingredox stateSr isotopesexperiments
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 87 , Issue 1-2: Third Hutton Symposium. The Origin of Ganites and Related Rocks , 1996 , pp. 321 - 329
Copyright
Copyright © Royal Society of Edinburgh 1996

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Anderson, J. L.&Smith, D. R. 1995. The effects of temperature and fO2 on the Al-in-hornblende barometer AM MINERAL 80, 549–59.CrossRefGoogle Scholar
Barbero, L., Villaseca, C., Rogers, G.&Brown, P. E. 1995. Geochemical and isotopic disequilibrium during crustal melting: an insight from the anatectic granitoids from Toledo, Spain. J GEOPHYS RES 100, 15745–65.Google Scholar
Bhattacharya, A.&Sen, S. K. 1986. Granulite metamorphism, fluid buffering and dehydration melting in the Madras charnockites and metajelites. J PETROL 27, 1119–1141.CrossRefGoogle Scholar
Blevin, P. L.&Chappell, B. W. 1992. The role of magma sources, oxidation states and fractionation in determining the granite metallogeny of eastern Australia. TRANS R SOC EDINBURGH EARTH SCI 83, 305–16.Google Scholar
Candela, P. 1986. The evolution of aqueous vapour from silicate melts: effects on oxygen fugacity. GEOCHIM COSMOCHIM ACTA 50, 1205–11.CrossRefGoogle Scholar
Carmichael, I. S. E. 1991. The redox state of basic and silicic magmas: a reflection of their source regions? CONTRIB MINERAL PETROL 106, 129–41.CrossRefGoogle Scholar
Carmichael, I. S. E.&Ghiorso, M. 1990. The effect of oxygen fugacity on the redox state of natural liquids and their crystallizing phases. In Nicholls, J.&Russel, J. K. (eds) Modern methods of igneous petrology: understanding magmatic processes. REV MINERAL 24, 191–212.Google Scholar
Chappell, B. W. 1979. Granites as images of their source rocks. GEOL SOC AM ABSTR PROGRAM 11, 400.Google Scholar
Chappell, B. W.&White, A. J. R. 1992. I- and S-type granites in the Lachlan Fold Belt. TRANS R SOC EDINBURGH EARTH SCI 83, 1–26.Google Scholar
Chappell, B. W., White, A. J. R.&Wyborn, D. 1987. The importance of residual source material (restite) in granite petrogenesis. J PETROL 28, 1111–38.CrossRefGoogle Scholar
Chou, I.-M. 1987. Oxygen buffer and hydrogen sensor techniques at elevated pressures and temperatures. In Ulmer, G. C. & Barnes, H. L. (eds) Hydrothermal experimental techniques, 61–99. New York: Wiley.Google Scholar
Clemens, J. D.&Mawer, C. K. 1992. Granitic magma transport by fracture propagation. TECTONOPHYSICS 204, 339–60.CrossRefGoogle Scholar
Cuney, M., Marignac, C.&Weisbrod, A. 1992. The Beauvoir topazlepidolite albite granite (Massif Central, France): the disseminated magmatic Sn-Li-Ta-Nb-Be mineralization. ECON GEOL 87, 1766–94.CrossRefGoogle Scholar
Czamanske, G. K.&Wones, D. R. 1973. Oxidation during magmatic differentiation, Finnmarka complex, Oslo area, Norway. Part 2, the mafic silicates. J PETROL 14, 349–80.CrossRefGoogle Scholar
Deniel, C., Vidal, P., Fernandez, A., Le Fort, P. and Peucat, J-J. 1987. Isotopic study of the Manaslu granite (Himalaya, Nepal): inferences on the age and source of Himalayan leucogranites. CONTRIB MINERAL PETROL 96, 78–92.CrossRefGoogle Scholar
Emslie, R. F.&Stirling, J. A. R. 1993. Rapakivi and related granitoids of the Nain Plutonic Suite: geochemistry, mineral assemblages and fluid equilibria. CAN MINERAL 31, 821–47.Google Scholar
Feldstein, S. N., Halliday, A. N., Davies, G. R.&Hall, C. M. 1994. Isotope and chemical microsampling: constraints on the history of an S-type rhyolite, San Vicenzo, Tuscany, Italy. GEOCHIM COSMOCHIM ACTA 58, 943–58.CrossRefGoogle Scholar
Ferrara, G., Pietrini, R., Serri, G.&Tonarini, S. 1989. Petrology and isotope geochemistry of San Vicenzo rhyolites. BULL VOLCANOL 151, 379–88.CrossRefGoogle Scholar
France-Lanord, C. 1987. Chevauchement, métamorphisme et magmatisme en Himalaya du Népal central. Etude isotopique H,C,O. Thesis, University of Nancy.Google Scholar
Giletti, B. J.&Casserly, J. E. D. 1994. Strontium diffusion kinetics in plagioclase feldspars. GEOCHIM COSMOCHIM ACTA 58, 3785–93.CrossRefGoogle Scholar
Hammouda, T. 1995. Mécanismes et cinétique de fusion partielle d'assemblages à fluor-phlogopite: modélisation, expérimentation et implications géochimiques. Thesis, University of Orléans.Google Scholar
Hammouda, T., Pichavant, M., Barbey, P.&Brearley, A. J. 1995. Synthesis of fluorphlogopite single crystals. Application to experimental studies. EUR J MINERAL 7, 1381–7.CrossRefGoogle Scholar
Harris, N. B. W.&Inger, S. 1992. Trace element modelling of pelite-derived granites. CONTRIB MINERAL PETROL 110, 46–56.CrossRefGoogle Scholar
Hofmann, A. W.&Hart, S. R. 1978. An assessment of local and regional isotopic equilibrium in the mantle. EARTH PLANET SCI LETT 38, 44–62.CrossRefGoogle Scholar
Huppert, H. E.&Sparks, R. S. J. 1988. The generation of granitic magmas by intrusion of basalt into the continental crust. J PETROL 29, 599–624.CrossRefGoogle Scholar
Inger, S.&Harris, N. 1993. Geochemical constraints on leucogranite magmatism in the Langtang valley, Nepal Himalaya. J PETROL 34, 345–68.CrossRefGoogle Scholar
Kilinc, A., Carmichael, I. S. E., Rivers, M. L.&Sack, R. O. 1983. The ferric-ferrous ratio of natural silicate liquids equilibrated in air. CONTRIB MINERAL PETROL 83, 136–40.CrossRefGoogle Scholar
Le Fort, P. 1981. Manaslu leucogranite: a collision signature of the Himalayas. A model for its genesis and emplacement. J GEOPHYS RES 86, 10545–68.CrossRefGoogle Scholar
Le Fort, P., Cuney, M., Deniel, C.France-Lanord, C., Sheppard, S. M. F., Upreti, B. N.&Vidal, P. 1987. Crustal generation of the Himalayan leucogranites. TECTONOPHYSICS 134, 39–57.CrossRefGoogle Scholar
Linnen, R. L., Williams-Jones, A. E.&Martin, R. F. 1992. Evidence of magmatic cassiterite mineralization at the Nong Sua aplite-pegmatite complex, Thailand. CAN MINERAL 30, 739–61.Google Scholar
Linnen, R. L., Pichavant, M., Holtz, F.&Burgess, S. 1995. The effect of fO2 on the solubility, diffusion, and speciation of tin in haplogranitic melt at 850°C and 2 kbar. GEOCHIM COSMOCHIM ACTA 59, 1579–88.CrossRefGoogle Scholar
Maury, R. C.&Bizouard, H. 1974. Melting of acid xenolith into a basanite: an approach to the possible mechanisms of crustal contamination. CONTRIB MINERAL PETROL 48, 275–86.CrossRefGoogle Scholar
Miyashiro, A. 1964. Oxidation and reduction in the Earth's crust with special reference to the role of graphite. GEOCHIM COSMOCHIM ACTA 28, 717–29.CrossRefGoogle Scholar
Nabelek, P., Russ-Nabelek, C.&Denison, J. R. 1992. The generation and crystallization conditions of the Proterozoic Harney Peak leucogranite, Black Hills, South Dakota, USA: petrologic and geochemical constraints. CONTRIB MINERAL PETROL 110, 173–91.CrossRefGoogle Scholar
Ohmoto, H.&Kerrick, D. 1977. Devolatilization equilibria in graphitic systems. AM J SCI 277, 1013–44.CrossRefGoogle Scholar
Peucat, J. J. 1986. Behaviour of Rb-Sr whole rock and U-Pb zircon systems during partial melting as shown in migmatitic gneisses from the St Malo Massif, NE Brittany, France. J GEOL SOC LONDON 143, 875–85.CrossRefGoogle Scholar
Peucat, J. J.&Martin, H. 1985. Are Rb-Sr thin slabs migmatite ages always meaningful? N JARHB MINERAL ABH 152, 1–21.Google Scholar
Pichavant, M.&Manning, D. A. C. 1984. Petrogenesis of tourmaline granites and topaz granites: the contribution of experimental data. PHYS EARTH PLANET INTER 35, 31–50.CrossRefGoogle Scholar
Pichavant, M., Valencia Herrera, J., Boulmier, S., Briqueu, L., Joron, J.-L., Juteau, M., Marin, L., Michard, A., Sheppard, S. M. F., Treuil, M.&Vernet, M. 1987. The Macusani glasses, SE Peru: evidence of chemical fractionation in peraluminous magmas. In Mysen, B. O. (ed.) Magmatic processes: physicochemical principles. GEOCHEM SOC SPEC PUBL 1, 359–73.Google Scholar
Pichavant, M., Kontak, D. J., Valencia Herrera, J.&Clark, A. H. 1988a. The Miocene-Pliocene Macusani Volcanics, SE Peru. I. Mineralogy and magmatic evolution of a two-mica aluminosilicate-bearing ignimbrite suite. CONTRIB MINERAL PETROL 100, 300–24.CrossRefGoogle Scholar
Pichavant, M.. Kontak, D. J., Briqueu, L., Valencia Herrera, J.&Clark, A. H. 1988b. The Miocene-Pliocene Macusani Volcanics, SE Peru. II. Geochemistry and origin of a felsic peraluminous magma. CONTRIB MINERAL PETROL 100, 325–38.CrossRefGoogle Scholar
Powers, R. E.&Bohlen, S. R. 1985. The role of synmetamorphic igneous intrusions in the metamorphism and partial melting of metasediments. CONTRIB MINERAL PETROL 90, 401–9.CrossRefGoogle Scholar
Pushkar, P.&Stoeser, D. B. 1975. 87Sr/86Sr ratios in some volcanic rocks and some semifused inclusions of the San Francisco volcanic field. GEOLOGY 3, 669–701.2.0.CO;2>CrossRefGoogle Scholar
Rubie, D. C.&Brearley, A. J. 1990. A model for rates of disequilibrium melting during metamorphism. In Ashworth, J. R.&Brown, M. (eds) High temperature metamorphism and crustal anatexis, 57–86. London: Unwin Hyman.CrossRefGoogle Scholar
Sato, M. 1978. Oxygen fugacity of basaltic magmas and the role of gas-forming elements. GEOPHYS RES LETT 5, 447–9.CrossRefGoogle Scholar
Sawyer, E. W. 1991. Disequilibrium melting and the rate of melt-residuum separation during migmatisation of mafic rocks from the Grenville Front, Quebec. J PETROL 32, 701–38.CrossRefGoogle Scholar
Scaillet, B., France-Lanord, C.&Le Fort, P. 1990. Badrinath-Gangotri plutons (Garhwal, India): petrological and geochemical evidence for fractionation processes in a high Himalayan leucogranite. J VOLCANOL GEOTHERM RES 44, 163–88.CrossRefGoogle Scholar
Scaillet, B., Pichavant, M.&Roux, J. 1995a. Experimental crystallization of leucogranite magmas. J PETROL 36, 663–705.CrossRefGoogle Scholar
Scaillet, B., Pêcher, A., Rochette, P.&Champenois, M. 1995b. The Gangotri granite (Garhwal Himalaya): laccolithic emplacement in an extending collisional belt. J GEOPHYS RES 100, 585–607.CrossRefGoogle Scholar
Scaillet, B., Pichavant, M.&Holtz, F. 1995c. Experimental constraints on the petrogenesis of the high himalayan leucogranites. In 10th Himalaya Karakoram Tibet Workshop. MITT GEOL INST ETH UNIV ZURICH 298.Google Scholar
Tsuchiyama, A. 1985. Partial melting of plagioclase-diopside pairs. CONTRIB MINERAL PETROL 91, 12–23.CrossRefGoogle Scholar
Visonà, D.&Zantedeschi, C. 1994. Spodumene, petalite and cassiterite, new occurrence in Himalayan leucogranite pegmatites: petro-logical implications. In 16th IMA General Meeting, Pisa, 429.Google Scholar
Wall, V. J., Clemens, J. D.&Clarke, D. B. 1987. Models for granitoid evolution and source composition. J GEOL 95, 731–49.CrossRefGoogle Scholar
White, A. J. R., Clemens, J. D., Holloway, J. R., Silver, L. T., Chappell, B. W.&Wall, V. J. 1986. S-type granites and their probable absence in southwestern North America. GEOLOGY 15, 115–8.2.0.CO;2>CrossRefGoogle Scholar
Zen, E-an 1985. An oxygen buffer for some peraluminous granites and metamorphic rocks. AM MINERAL 70, 65–73.Google Scholar