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Abstract:

Chemical diffusivities approximating tracer diffusivities of Sr, Nd, and Pb have been measured in a natural rhyolite melt at 1.0 GPa and temperatures from 1000 to 1450°C using the diffusion couple technique. Diffusivities for all three elements were determined under nominally anhydrous conditions. Lead diffusivities were also determined at ∼1 and 2.5 wt% dissolved H 2 O in the melt. The results are described by the following Arrhenius equations (D in m 2 /s, activation energy in J/mol, T in Kelvin): D (Sr,dry) = 1.58 × 10 -3 e -(264200/RT) D (Nd,dry) = 1.28 × 10 -2 e -(330200/RT) D (Pb,dry) = 1.92 × 10 -7 e -(148400/RT) D (Pb,∼1%) = 1.18 × 10 -7 e -(131700/RT) D (Pb,∼2.5%) = 2.18 × 10 -9 e -(73600/RT) . The results are consistent to within an order of magnitude with previously reported Sr, Nd, and Pb tracer diffusivities. Under anhydrous conditions, the relative magnitudes of the diffusion coefficients are D Sr ≈ D Pb > D Nd . D Nd determined in this work is similar to previously reported D Si . The implication of these results is that Pb and Sr diffusion-controlled isotopic and chemical exchange can occur at a faster rate than major element chemical exchange, but that Nd exchange occurs at about the same rate as major element exchange. The consequences of this process are illustrated with a model of isotopic exchange in a basaltic-granitic, double-diffusive, convecting magma chamber. The diffusivity of Pb increases with increasing dissolved water more than that of Si increases suggesting that, at least for Pb, isotopic homogenization also occurs faster than chemical homogenization under hydrous conditions.

Registro:

Documento: Artículo
Título:Diffusivity of strontium, neodymium, and lead in natural rhyolite melt at 1.0 GPa
Autor:Perez, W.A.; Dunn, T.
Filiación:Department of Geology, University of New Brunswick, Fredericton, NB E3B 5A3, Canada
Consejo Nac. de Invest. Cie. y Tec., Pabellón INGEIS, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Department of Geology, University of Alberta, Edmonton, Alta. T6G 2E3, Canada
Palabras clave:chemical diffusivity; isotopic exchange; lead; magma chamber; neodymium; rhyolite melt; strontium
Año:1996
Volumen:60
Número:8
Página de inicio:1387
Página de fin:1397
DOI: http://dx.doi.org/10.1016/0016-7037(96)00016-6
Título revista:Geochimica et Cosmochimica Acta
Título revista abreviado:Geochim. Cosmochim. Acta
ISSN:00167037
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00167037_v60_n8_p1387_Perez

Referencias:

  • Anderson, A.T., Newman, S., Williams, S.N., Druitt, T.H., Skirius, C., Stolper, E., H 2 O, CO 2 , Cl and gas in plinian and ash-flow Bishop rhyolite (1989) Geology, 17, pp. 221-225
  • Baker, D.R., Tracer versus trace element diffusion: Diffusional decoupling of Sr concentration from Sr isotope composition (1989) Geochim. Cosmochim. Acta, 53, pp. 3015-3023
  • Baker, D.R., Chemical interdiffusion of dacite and rhyolite: Anhydrous measurement at 1 atm and 10 kbar, application of transition state theory and diffusion in zoned magma chambers (1990) Contrib. Mineral. Petrol., 104, pp. 407-423
  • Baker, D.R., Interdiffusion of hydrous dacitic and rhyolitic melts and the efficacy of rhyolite contamination of dacitic enclaves (1991) Contrib. Mineral. Petrol., 106, pp. 462-473
  • Baker, D.R., Tracer diffusion of network formers and multicomponent diffusion in dacitic and rhyolitic melts (1992) Geochim. Cosmochim. Acta, 56, pp. 617-631
  • Baker, M.B., Stolper, E.M., Determining the composition of high-pressure mantle melts using diamond aggregates (1994) Geochim. Cosmochim. Acta, 58, pp. 2811-2827
  • Bowen, N.L., (1921) The Evolution of Igneous Rocks, , Dover
  • Burnham, C.W., Davis, N.F., Partial molar volume of water in albite melts (1969) Trans. Amer. Geophys. Union Eos, 50, p. 338
  • Clark, S., Spera, F.J., Yuen, D.A., Steady state double-diffusive convection in magma chambers heated from below (1987) Magmatic Processes: Physicochemical Principles, pp. 289-305. , (ed. B. O. Mysen); Special Publication No. 1, Geochemical Society
  • Crank, J., (1979) The Mathematics of Diffusion, 2nd. Ed., , Oxford
  • DePaolo, D.J., Trace element and isotopic effects of combined wallrock assimilation and fractional crystallization (1981) Earth Planet. Sci. Lett., 53, pp. 189-202
  • Dunn, T., Diffusion in silicate melts: An introduction and literature review (1986) Mineralogical Association of Canada, Short Course in Silicate Melts, 12, pp. 57-87. , (ed. Scarfe C. M.), Chap. 3
  • Dunn, T., Uranium (VI) diffusion in a supercooled borosilicate melt (1987) J. Non-cryst. Solids, 92, pp. 1-10
  • Dunn, T., IGNEOUS: A Windows program to do analysis based petrologic calculations (1995) American Mineralogist, , http://ammin.gg.utk.edu/AmMinDocs/Software_Notices/Software.html, Software Notice published electronically on the World Wide Home Page
  • Dunn, T., Scarfe, C.M., Variation of the chemical diffusivity of oxygen and viscosity of an andesite melt with pressure at constant temperature (1986) Chem. Geol., 54, pp. 203-215
  • Dunn, T., Ratliffe, W.A., Chemical diffusion of ferrous iron in a peraluminous sodium aluminosilicate melt: 0.1 MPa to 2.0 GPa (1990) J. Geophys. Res., 95, pp. 15665-15673
  • Eichelberger, J.C., Andesitic volcanism and crustal evolution (1978) Nature, 275, pp. 21-27
  • Fine, G., Stolper, E., The speciation of carbon dioxide in sodium aluminosilicate glasses (1985) Contrib. Mineral. Petrol., 91, pp. 105-121
  • Furlong, K.P., Myers, J.D., Thermal-mechanical modelling of the role of thermal stresses and stoping in magma contamination (1985) J. Volcanol. Geotherm. Res., 24, pp. 179-191
  • Grove, T.L., Gerlach, D.C., Sando, T.W., Origin of calcalkaline series lavas at Medicine Lake volcano by fractionation, assimilation and mixing (1982) Contrib. Mineral. Petrol., 80, pp. 160-182
  • Harrison, T.M., Watson, E.B., Kinetics of zircon dissolution and zirconium diffusion in granitic melts of variable water content (1983) Contrib. Mineral. Petrol., 84, pp. 66-72
  • Harrison, T.M., Watson, E.B., The behavior of apatite during crustal anatexis: Equilibrium and kinetic constraints (1984) Geochim. Cosmochim. Acta, 48, pp. 1467-1477
  • Henderson, P., Nolan, J., Cunningham, G.C., Lowry, R.K., Structural controls and mechanisms of diffusion in natural silicate melts (1985) Contrib. Mineral. Petrol., 89, pp. 263-272
  • Hildreth, W., Moorbath, S., Crustal contributions to arc magmatism in the Andes of Central Chile (1988) Contrib. Mineral. Petrol., 98, pp. 455-489
  • Hofmann, A.W., Diffusion in natural silicate melts: A critical review (1980) Physics of Magmatic Process, pp. 385-410. , (ed. R. B. Hargraves), Chap. 9, Princeton Univ. Press
  • Holloway, J.R., Pan, V., Gudmundsson, G., High-pressure fluid-absent melting experiments in the presence of graphite: Oxygen fugacity, ferric/ferrous ratio and dissolved CO 2 (1992) European J. Mineral., 4, pp. 105-114
  • Huppert, H.E., Sparks, S.J., Turner, J.S., The generation of granitic magmas by intrusion of basalts into continental crust (1988) J. Petrol., 29, pp. 599-624
  • Jambon, A., Tracer diffusion in granitic melts: Experimental results for Na, Rb, Cs, Ca, Sr, Ba, Ce and Eu up to 1300°C and a model for calculation (1982) J. Geophys. Res., 87, pp. 10797-10810
  • Kress, V.C., Carmichael, I.S.E., The compressibility of silicate liquids containing Fe 2 O 3 and the effect of composition, temperature, oxygen fugacity and pressure on their redox states (1991) Contrib. Mineral. Petrol., 108, pp. 82-92
  • Lange, R.A., Carmichael, I.S.E., Densities of Na 2 O-K 2 O-CaO-MgO-FeO-Fe 2 O 3 -Al 2 O 3 -TiO 2 -SiO 2 liquids: New measurements and derived partial molar volumes (1987) Geochim. Cosmochim. Acta, 51, pp. 2931-2946
  • Lange, R.A., Carmichael, I.S.E., Ferric-Ferrous equilibria in Na 2 O-FeO-Fe 2 O 3 -SiO 2 melts: Effects of analytical technique on derived partial molar volumes (1989) Geochim. Cosmochim. Acta, 53, pp. 2195-2204
  • Lasaga, A.C., Geospeedometry: An extension of Geothermometry (1983) Advances in Physical Geochemistry, 3, pp. 81-114. , Kinetics and Equilibrium in Mineral Reactions (ed. S. K. Saxena)
  • Lesher, C.E., Decoupling of chemical and isotopic exchange during magma mixing (1990) Nature, 344, pp. 235-237
  • Lesher, C.E., Kinetics of Sr and Nd exchange in silicate liquids: Theory, experiments, and applications to uphill diffusion, isotopic equilibration, and irreversible mixing of magmas (1994) J. Geophys. Res., 99, pp. 9585-9604
  • Lowry, R.K., Henderson, P., Nolan, J., Tracer diffusion of some alkali, alkaline-earth and transition elements ions in a basaltic and andesitic melt, and the implications concerning melt structure (1982) Contrib. Mineral. Petrol., 80, pp. 254-261
  • Newman, S., Stolper, E.M., Epstein, S., Measurement of water in rhyolitic glasses: Calibration of an infrared spectroscopy technique (1986) Amer. Mineral., 71, pp. 1527-1541
  • O'Hara, M.J., Matthews, R.E., Geochemical evolution in an advancing, periodically replenished, periodically tapped, continuously fractionated magma chamber (1981) J. Geol. Soc. London, 138, pp. 237-277
  • Reagan, M.K., Gill, J.B., Malavassi, E., Garcia, M.O., Changes in magma composition at Arenal volcano, Costa Rica, 1968-1985: Real-time monitoring of open-system magmatic differentiation (1987) Bull. Volcanol., 49, pp. 415-434
  • Richter, F.M., A method for determining activity-compositions relations using chemical diffusion in silicate melts (1993) Geochim. Cosmochim. Acta, 57, pp. 2019-2032
  • Robie, R.A., Hemingway, B.S., Fisher, J.R., Thermodynamic properties of minerals and related substances at 298.15K and 1 Bar (105 Pascals) pressure and at higher temperatures (1979) USGS Bull. 1452
  • Shaw, H.R., Viscosities of magmatic silicate liquids: An empirical method of prediction (1972) Amer. J. Sci., 272, pp. 870-893
  • Spera, F.J., Yuen, D.A., Clark, S., Hong, H.J., Double-diffusive convection in magma chambers: Single or multiple layers? (1986) Geophys. Res. Lett., 13, pp. 153-156
  • Stewart, B.W., DePaolo, D.J., Diffusive isotope contamination of mafic magma by coexisting silicic liquids in the Muskox Intrusion (1992) Science, 255, pp. 708-711
  • Stolper, E., Fine, G., Johnson, T., Newman, S., Solubility of carbon dioxide in albitic melt (1987) Amer. Mineral., 72, pp. 1071-1085
  • Taylor H.P., Jr., The effects of assimilation of country rocks by magmas on 18 O/ 16 O and 87 Sr/ 86 Sr systematics (1980) Earth Planet. Sci. Lett., 47, pp. 243-254
  • Turner, J.S., (1973) Buoyancy Effects in Fluids, , Cambridge Univ. Press
  • Turner, J.S., Campbell, I.H., Convection and mixing in magma chambers (1986) Earth Sci. Rev., 23, pp. 255-352
  • Watson, E.B., Diffusion in volatile-bearing magmas (1994) Rev. Mineral., 30, pp. 371-411. , Volatiles in Magmas (ed. M. R. Carroll and J. R. Holloway)
  • Watson, E.B., Baker, D.R., Chemical diffusion in magmas. An overview of experimental results and geochemical implications (1991) Adv. Phys. Geochem., 9, pp. 120-151. , ed. L. L. Perchuk and I. Kushiro
  • Wasserburg, G.J., Albee, A.L., Lanphere, M.A., Migration of strontium during metamorphism (1964) J. Geophys. Res., 69, pp. 4395-4401
  • Wei, G.C.T., Wuensch, B.J., Tracer concentration gradients for diffusion coefficients exponentially dependent on concentration (1976) J. Amer. Ceram. Soc., 59, pp. 295-299
  • Wyllie, P.J., Magma genesis, plate tectonics and chemical differentiation of the Earth (1988) Rev. Geophys., 26, pp. 370-404

Citas:

---------- APA ----------
Perez, W.A. & Dunn, T. (1996) . Diffusivity of strontium, neodymium, and lead in natural rhyolite melt at 1.0 GPa. Geochimica et Cosmochimica Acta, 60(8), 1387-1397.
http://dx.doi.org/10.1016/0016-7037(96)00016-6
---------- CHICAGO ----------
Perez, W.A., Dunn, T. "Diffusivity of strontium, neodymium, and lead in natural rhyolite melt at 1.0 GPa" . Geochimica et Cosmochimica Acta 60, no. 8 (1996) : 1387-1397.
http://dx.doi.org/10.1016/0016-7037(96)00016-6
---------- MLA ----------
Perez, W.A., Dunn, T. "Diffusivity of strontium, neodymium, and lead in natural rhyolite melt at 1.0 GPa" . Geochimica et Cosmochimica Acta, vol. 60, no. 8, 1996, pp. 1387-1397.
http://dx.doi.org/10.1016/0016-7037(96)00016-6
---------- VANCOUVER ----------
Perez, W.A., Dunn, T. Diffusivity of strontium, neodymium, and lead in natural rhyolite melt at 1.0 GPa. Geochim. Cosmochim. Acta. 1996;60(8):1387-1397.
http://dx.doi.org/10.1016/0016-7037(96)00016-6