Hostname: page-component-7dd5485656-bvgqh Total loading time: 0 Render date: 2025-10-31T14:46:39.083Z Has data issue: false hasContentIssue false
  • English
  • Français

REE and trace element variations in accessory minerals and hornblende from the strongly zoned McMurry Meadows Pluton, California

Published online by Cambridge University Press:  03 November 2011

Wayne N. Sawka
Wayne N. Sawka
Affiliation:
Earth Science Department L-201, Lawrence Livermore National Laboratory, Livermore, California 94550, U.S.A.
Get access Rights & Permissions [Opens in a new window]

Abstract

The zoned McMurry Meadows Pluton has been examined for REE and trace element variations in hornblende, sphene, apatite, allanite and zircon. Mineral separates (17), were analysed by INAA from four granitoids spanning the compositional range of the pluton (60%–75% SiO2). All of the phases examined exhibit significant compositional variations, with sphene having the largest changes in chondrite normalised REE patterns. Compositional variations in these minerals are related to paragenetic sequence and, as the whole rocks become more evolved, increases in partition coefficients; not subsolidus re-equilibration. Hornblende is only a dominant site for REE in granites where sphene is a later crystallising phase, otherwise allanite (LREE only) and sphene are the dominant whole rock sites for REE. Zircon and apatite normally contribute less than 10% each to the whole rock abundance of REE. Three zircon samples contain only small compositional differences and are interpreted as having crystallised from the bulk magma prior to differentiation. Zr variation in the pluton is nonlinear, first increasing and then decreasing with whole rock fractionation. A simple process, analogous to “restite unmixing” applied to the Zr variation, defines a bulk magma composition of about 63% SiO2, before differentiation of the zoned pluton. The modelled bulk magma need only have evolved by about 2·5% silica and still have produced the entire compositional range (60–75% SiO2) observed in the pluton.

Keywords

allaniteapatitegraniteparagenetic sequencepartitioningsphenezircon

Information

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 79 , Issue 2-3: The Origin of Granites , 1988 , pp. 157 - 168
Copyright
Copyright © Royal Society of Edinburgh 1988

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.)

Article purchase

Temporarily unavailable

References

Albarede, F. & Bottinga, Y. 1972. Kinetic disequilibrium in trace element partitioning between phenocrysts and host lava. GEOCHIM COSMOCHIM ACTA 36, 141–156.CrossRefGoogle Scholar
Arzi, A. A. 1978. Critical phenomena in the rheology of partially melted rocks. TECTONOPHYSICS 44, 173–184.Google Scholar
Barnes, C. G., Allen, C. M. & Brigham, R. H. 1987. Isotopic heterogeneity in a tilted plutonic system, Klamath Mountains, California. GEOLOGY 15, 523–527.Google Scholar
Brooks, C. K., Henderson, P. & Ronsbo, J. G. 1981. Rare-earth partition between allanite and glass in the obsidian of Sandy Braes, Northern Ireland. MINERAL MAG 44, 157–160.CrossRefGoogle Scholar
Chappell, B. W. 1984. Source rocks of I- and S-type granites in the Lachlan Fold Belt, southeastern Australia. PHILOS TRANS R SOC LONDON A310, 693–707.Google Scholar
Compston, W. & Chappell, B. W. 1979. Sr-isotope evolution of granitoid source rocks, In McElhinny, M. W. (ed.) The Earth, Its Origin, Structure and Evolution. New York: Academic Press.Google Scholar
Dodge, F. C. W., Millard, H. T. & Elsheimer, H. N. 1982. Compositions and variations of selected elements in granitoid rock and constituent minerals, Central Sierra Nevada Batholith, California. U.S. GEOL SURV PROF PAP 1248.Google Scholar
Dowty, E. 1977. The importance of adsorption in igneous partitioning of trace elements. GEOCHIM COSMOCHIM ACTA 41, 1643–1646.Google Scholar
Fourcade, C. J. & Allegre, C. J. 1981. Trace Element Behavior in Granite Genesis: A Case Study—The Calc-Alkaline Plutonic Association from the Querigut Complex (Pyrenees, France). CONTRIB MINERAL PETROL 76, 177–195.Google Scholar
Gamble, R. P. & Taylor, L. A. 1980. Crystal/liquid partitioning in augite: effects of cooling rate. EARTH PLANET SCI LETT 47, 21–33.CrossRefGoogle Scholar
Green, T. H. & Pearson, N. J. 1983. Effect of pressure on rare earth element partition coefficients in common magmas. NATURE 305, 5933, 414–416.Google Scholar
Green, T. H. & Pearson, N. J. 1984. Stability of REE-acceptor minerals at high pressures and temperatures. In Geoscience in the development of natural resources. GEOL SOC AUST ABSTR 12, 197–199.Google Scholar
Green, T. H. & Pearson, N. J. 1985. Experimental determination of REE partition coefficients between amphibole and basaltic to andesitic liquids at high pressure. GEOCHIM COSMOCHIM ACTA 49, 1465–1468.CrossRefGoogle Scholar
Green, T. H. & Pearson, N. J. 1986. Rare-earth element partitioning between sphene and co-existing silicate liquid at high pressure and temperature. GEOCHIM GEOL 55, 105–119.Google Scholar
Gromet, L. P. & Silver, L. T. 1983. Rare earth element distributions among minerals in a granodiorite and their petrogenetic implications. GEOCHIM COSMOCHIM ACTA 47, 925–939.Google Scholar
Halliday, A. N. 1983. Crustal melting and the genesis of isotopically and chemically zoned plutons in the Southern Uplands of Scotland. In Atherton, M. P. & Gribble, C. D. (eds) Migmatites, melting and metamorphism, 54–61. Nantwich: Shiva.Google Scholar
Hart, S. R. & Allegre, C. J. 1980. Trace-element constraints on magma genesis. In Hargraves, R. B. (ed.) Physics of magmatic processes, 121–159. Princeton, N.J.: Princeton University Press.Google Scholar
Hildreth, W. 1981. Gradients in silicic magma chambers: implications for lithospheric magmatism. J GEOPHYS RES 86(B11), 10153–10192.CrossRefGoogle Scholar
Hill, R. I., Silver, L. T., Chappell, B. W. & Taylor, H. P. 1985. Solidification and recharge of SiO2-rich magma chambers. NATURE 313, 6004, 643–646.CrossRefGoogle Scholar
Kistler, R. W., Chappell, B. W., Peck, D. L. & Bateman, P. C. 1986. Isotopic variation in the Tuolumne Intrusive Suite, Central Sierra Nevada, California. CONTRIB MINERAL PETROL 94, 205–220.CrossRefGoogle Scholar
Lee, D. E. & Christiansen, E. H. 1983. The granite problem as exposed in the southern snake range, Nevada. CONTRIB MINERAL PETROL 83, 99–116.CrossRefGoogle Scholar
Luhr, J. F., Carmichael, I. S. E. & Varekamp, J. C. 1984. The 1982 eruptions of El Chichon volcano, Chiapas, Mexico: mineralogy and petrology of the anhydrite-bearing pumices. J VOLCANOL GEOTHERM RES 23, 69–108.Google Scholar
Marsh, B. D. 1981. On the crystallinity probability of occurrence and rheology of lava and magma. CONTRIB MINERAL PETROL 78, 85–98.Google Scholar
Mahood, G. & Hildreth, W. 1983. Large partition coefficients for trace elements in high-silica rhyolites. GEOCHIM COSMOCHIM ACTA 47, 11–30.Google Scholar
McCarthy, T. S. & Hasty, R. A. 1976. Trace Element Distribution Patterns and Their Relationship to the Crystallization of Granitic Melts. GEOCHIM COSMOCHIM ACTA 140, 1351–1358.Google Scholar
Michael, P. J. 1988. Partition coefficients for rare earth elements in mafic minerals of high silica rhyolites: The importance of accessory mineral inclusions. GEOCHIM COSMOCHIM ACTA 52, 275–282.CrossRefGoogle Scholar
Nagasawa, H. 1970. Rare earth concentrations in zircons and apatites and their host dacites and granites. EARTH PLANET SCI LETT 9, 359–364.CrossRefGoogle Scholar
Noyles, H. J.Frey, F. A. & Wones, D. R. 1983. A Tale of Two Plutons: Geochemical Evidence Bearing on the Origin and Differentiation of the Red Lake and Eagle Peak Plutons, Central Sierra Nevada, Calif. J GEOL 91, 487–509.Google Scholar
Sawka, W. N., Chappell, B. W. & Norrish, K. 1984. Light-rare-earth-element zoning in sphene and allanite during granitoid fractionation. GEOLOGY 12, 131–134.Google Scholar
Sawka, W. N., Chappell, B. W. & Kistler, R. W. 1988. Granitoid compositional zoning by side wall boundary layer differentiation: evidence from the Palisade Crest Suite, Central Sierra, Nevada, California. J PETROL (in press).Google Scholar
Sawka, W. N. & Chappell, B. W. 1988. Fractionation of uranium, thorium and rare earth elements in a granodiorite: implications to heat production distributions in the Sierra Nevada batholith, California, U.S.A. GEOCHIM COSMOCHIM ACTA 52, 1131–1143.CrossRefGoogle Scholar
Tindle, A. G. & Pearce, J. A. 1981. Petrogenetic Modeling of in situ Fractional Crystallization in the Zoned Loch Doon Pluton, Scotland. CONTRIB MINERAL PETROL 78, 196–207.CrossRefGoogle Scholar
Van der Molen, I. & Patterson, M. S. 1979. Experimental deformation of partially-melted granite. CONTRIB MINERAL PETROL 70, 299–318.Google Scholar
Watson, E. B. & Harrison, T. M. 1983. Zircon saturation revisited: temperature and compositional effects in a variety of crustal magma types. EARTH PLANET SCI LETT 64, 295–304.CrossRefGoogle Scholar
White, A. J. R. & Chappell, B. W. 1977. Ultrametamorphism and granitoid genesis. TECTONOPHYSICS 43, 7–22.Google Scholar
Wyborn, D. 1983. Fractionation processes in the Boggy Plain zoned pluton. Unpublished Ph.D. Thesis, Australian National University, Canberra.Google Scholar