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Spatial, compositional and rheological constraints on the origin of zoning in the Criffell pluton, Scotland

Published online by Cambridge University Press:  03 November 2011

W. E. Stephens
W. E. Stephens
Affiliation:
W. E. Stephens, Department of Geography & Geology, University of St Andrews, St Andrews, Fife KY169ST, Scotland
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Abstract

The Criffell pluton in southwestern Scotland (397 Ma, a Newer Granite of late Caledonian age) is concentrically zoned with outer granodiorites of typically I-type aspect passing into inner granite with more evolved characteristics. The zonation is examined in terms of the compositional surfaces of bulk parameters such as SiO2 and Rb/Sr and compositional variation is best modelled as multi-pulse, there being greater variation in bulk composition between pulses than within pulse. Published variations in Sr, Nd and O isotopes reflect the derivation of the pulses from separate and isotopically distinct sources. Other evidence for open-system behaviour includes mingling with mafic magmas to form enclaves, whereas closed-system behaviour is indicated by restite separation in the early granodiorites, and fractional crystallisation in the late granites. A dominant infracrustal I-type magma formed the first pulse followed by magma derived from more evolved crustal rocks (mainly metasediments of varying ages and maturities). Experimental fluid-absent melting of amphibolite and metapelite at about 900°C has shown that significant quantities of melt can be generated, respectively with I-type and S-type characteristics. Despite having similar bulk compositions, these melts have very different viscosities and densities for the same H2O contents (ηS-type>ηI-type and ρS-type≤ρI-type). It is argued that the rheological controls on magma escape from the source region along complex and tortuous pathways favour the more fluid I-type melts over the more viscous (and only slightly less dense) S-type melts. This constraint could have the effect of reversing the expected buoyancy-driven emplacement sequence, and may represent an alternative rheological differentiation mechanism for the formation of some zoned plutons.

Keywords

granitecompositional zoningCaledonian
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 83 , Issue 1-2: Second Hutton Symposium: The Origin of Granites and Related Rocks , 1992 , pp. 191 - 199
Copyright
Copyright © Royal Society of Edinburgh 1992

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References

Barrière, M. 1976. Flowage differentiation; limitation of the “Bagnold effect” to narrow intrusion. CONTRIB MINERAL PETROL 55, 139–45.CrossRefGoogle Scholar
Bateman, P. C. & Chappell, B. W. 1979. Crystallisation, fractionation and solidification of the Tuolumne Intrusive Series, Yosemite National Park, California. BULL GEOL SOC AM 90, 465–82.2.0.CO;2>CrossRefGoogle Scholar
Beard, J. S. & Lofgren, G. E. 1989. Effects of water on the composition and partial melts of greenstone and amphibolite. SCIENCE 244, 195–7.CrossRefGoogle ScholarPubMed
Bottinga, J. & Weill, D. F. 1970. Density of liquid silicate systems calculated from partial molar volumes of oxide components. AM J SCI 269, 169–82.CrossRefGoogle Scholar
Bottinga, J. & Weill, D. F. 1972. The viscosity of magmatic silicate liquids: a model for calculation. AM J SCI 272, 438–75.CrossRefGoogle Scholar
Carrigan, C. R. & Eichelberger, J. C. 1990. Zoning of magmas by viscosity in volcanic conduits. NATURE 343, 248–51.CrossRefGoogle Scholar
Chappell, B. W. 1979. Granites as images of their source rocks. GEOL SOC AM PROG ABS TR 11, 400.Google Scholar
Chappell, B. W. & Stephens, W. E. 1988. Origin of infracrustal (I-type) granite magmas. TRANS R SOC EDINBURGH EARTH SCI 79, 71–86.Google Scholar
Chappell, B. W. & White, A. J. R. 1974. Two contrasting magma types. PAC GEOL 8, 173–4.Google Scholar
DePaolo, D. J. 1981. Trace element and isotopic effects of combined wallrock assimilation and fractional crystallisation. EARTH PLANET SCI LETT 53, 189–202.CrossRefGoogle Scholar
Grout, F. F. 1945. Scale models of structures related to batholiths. AM J SCI 243A, 260.Google Scholar
Halliday, A. N., Stephens, W. E. & Harmon, R. S. 1980. Rb-Sr and O isotopic relationships in 3 zoned Caledonian granitic plutons, Southern Uplands, Scotland: evidence for varied sources and hybridization of magmas. J GEOL SOC LONDON 137, 329–48.CrossRefGoogle Scholar
Holden, P., Halliday, A. N. & Stephens, W. E. 1987. Neodymium and strontium isotope content of microdiorite enclaves points to mantle input to granitoid production. NATURE 330, 51–6.CrossRefGoogle Scholar
Holder, M. T. 1979. An emplacement mechanism for post-tectonic granites and its implications for their geochemical features. In Atherton, M. P. & Tarney, J. (eds) Origin of granite batholiths: geochemical evidence, 116–28. Orpington: Shiva Press.CrossRefGoogle Scholar
Hulme, G. 1974. The interpretation of lava flow morphology. GEOPHYS J ROY ASTR SOC 39, 361–83.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, 205–20.CrossRefGoogle Scholar
Lesher, C. E. 1990. Decoupling of chemical and isotopic exchange during magma mixing. NATURE 334, 235–7.CrossRefGoogle Scholar
McBirney, A. R. & Murase, T. 1984. Rheological properties of magmas. ANN REV EARTH PLANET SCI 12, 337–57.CrossRefGoogle Scholar
Miller, C. F. 1985. Are strongly peraluminous magmas derived from pelitic sedimentary sources? J GEOL 93, 673–89.CrossRefGoogle Scholar
Miller, C. F., Watson, E. B. & Harrison, T. M. 1987. Perspectives on source, segregation and transport of granitoid magmas. TRANS R SOC EDINBURGH EARTH SCI 79, 135–56.Google Scholar
Murase, T. & McBirney, A. R. 1973. Properties of some common igneous rocks and their melts at high temperature. GEOL SOC AM BULL 84, 3563–92.2.0.CO;2>CrossRefGoogle Scholar
Nockolds, S. R. 1940. The Garabal Hill-Glen Fyne igneous complex. J GEOL SOC LONDON 96, 451–511.CrossRefGoogle Scholar
O'Nions, R. K., Hamilton, P. J. & Hooker, P. J. 1983. A Nd isotope investigation of sediments related to crustal development in the British Isles. EARTH PLANET SCI LETT 63, 229–40.CrossRefGoogle Scholar
Patchett, P. J. 1991. Isotope geochemistry and chemical evolution of the mantle and crust. Rev Geophys for 1991, Supplement. AM GEOPHYS UNION, 457–70.Google Scholar
Douce, A. E.Patiño & Johnston, A. D. 1991. Phase equilibria and melt productivity in the pelitic system: Implications for the origin of peraluminous granitoids and aluminous granulites. CONTRIB MINERAL PETROL 107, 202–18.CrossRefGoogle Scholar
Phillips, W. J. 1956. The Criffell-Dalbeattie granodiorite complex. J GEOL SOC LONDON 112, 221–39.CrossRefGoogle Scholar
Phillips, W. J., Fuge, R. & Phillips, N. 1981. Convection and crystallisation in the Criffell-Dalbeattie pluton. J GEOL SOC LONDON 138, 351–66.CrossRefGoogle Scholar
Rutter, M. J. & Wyllie, P. J. 1988. Melting of vapour-absent tonalite at 10 kbar to simulate dehydration-melting in the deep crust. NATURE 331, 159–60.CrossRefGoogle Scholar
Shaw, H. R. 1972. Viscosities of magmatic silicate liquids: an empirical method of prediction. AM J SCI 266, 255–64.Google Scholar
Stephens, W. E. 1988. Granitoid plutonism in the Caledonian orogen of Europe. In Harris, A. L. et al. (eds) The Caledonian-Appalachian orogen. GEOL SOC LONDON SPEC PUBL 38, 389–403.CrossRefGoogle Scholar
Stephens, W. E. & Castro, A. 1991. Mafic clots in the Strontian pluton: restite or the debris of magma mingling? TERRA ABSTR 4, 31–2.Google Scholar
Stephens, W. E. & Halliday, A. N. 1980. Discontinuities in the composition surface of a zoned pluton, Criffell, Scotland. GEOL SOC AM BULL 91, 165–70.2.0.CO;2>CrossRefGoogle Scholar
Stephens, W. E. & Halliday, A. N. 1984. Geochemical contrasts between late Caledonian granitoid plutons of northern, central and southern Scotland. TRANS R SOC EDINBURGH EARTH SCI 75, 259–73.CrossRefGoogle Scholar
Stephens, W. E., Whitley, J. E., Thirlwall, M. F. & Halliday, A. N. 1985. The Criffell zoned pluton: correlated behaviour of rare-earth element abundances with isotopic systems. CONTRIB MINERAL PETROL 89, 226–38.CrossRefGoogle Scholar
Stephens, W. E., Holden, P. & Henney, P. J. 1991. Microdioritic enclaves within the Scottish Caledonian granitoids and their significance for crustal magmatism. In Didier, J. & Barbarin, B. (eds) Granites and their enclaves, 2nd edn, 125–134. Amsterdam: Elsevier.Google Scholar
Taniguchi, H. 1988. Surface tension of melts in the system CaMgSi2O6-CaAl2Si2O8 and its structural significance. CONTRIB MINERAL PETROL 100, 484–9.CrossRefGoogle Scholar
Taylor, W. P. 1976. Intrusion and differentiation of granitic magma at a high level in the crust: the Puscao pluton, Lima Province, Peru. J PETROL 17, 194–218.CrossRefGoogle Scholar
Tindle, A. G. & Pearce, J. A. 1981. Petrogenetic modelling of in situ fractional crystallisation in the zoned Loch Doon pluton, Scotland. CONTRIB MINERAL PETROL 78, 196–207.CrossRefGoogle Scholar
Vance, J. A. 1961. Zoned granitic intrusions-an alternative hypothesis of origin. GEOL SOC AM BULL 72, 1723–8.CrossRefGoogle Scholar
Walker, D. & Mullins, O. 1981. Surface tension of natural silicate melts from l,200°-l,500°C and implications for melt structure. CONTRIB MINERAL PETROL 76, 455–62.CrossRefGoogle Scholar