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Department of Earth Sciences

Staff and Postgraduate Students

Publication details for Prof Jon Davidson

Davidson, J.P, Hora, J.M, Garrison, J.M & Dungan, M.A (2005). Crustal Forensics in Arc Magmas. Journal of Volcanology and Geothermal Research 140(1-3): 157-170.

Author(s) from Durham

Abstract

The geochemical characteristics of continental crust are present in nearly all arc magmas. These characteristics may reflect a specific source process, such as fluid fluxing, common to both arc magmas and the continental crust, and/or may reflect the incorporation of continental crust into arc magmas either at source via subducted sediment, or via contamination during differentiation. Resolving the relative mass contributions of juvenile, mantle-derived material, versus that derived from preexisting crust of the upper plate, and providing these estimates on an element-by-element basis, is important because: (1) we want to constrain crustal growth rates; (2) we want to quantitatively track element cycling at convergent margins; and (3) we want to determine the origin of economically important elements and compounds.

Traditional geochemical approaches for determining the contributions of various components to arc magmas are particularly successful when applied on a comparative basis. Studies of suites from multiple magmatic systems along arcs, for which differentiation effects can be individually constrained, can be used to extrapolate to potential source compositions. In the Lesser Antilles Arc, for example, differentiation trends from individual volcanoes are consistent with open-system evolution. However, such trends do not project back to a common primitive magma composition, suggesting that differentiation modifies magmas that were derived from distinct mantle sources.

We propose that such approaches should now be complemented by petrographically constrained mineral-scale isotope and trace element analysis to unravel the contributing components to arc magmas. This innovative approach can: (1) better constrain true end-member compositions by returning wider ranges in geochemical compositions among constituent minerals than is found in whole rocks; (2) better determine magmatic evolution processes from core–rim isotopic or trace element profiles from the phases contained in magmas; and (3) constrain rates of differentiation by applying diffusion-controlled timescales to element profiles. An example from Nguaruhoe Volcano, New Zealand, underscores the importance of such a microsampling approach,showing that mineral isotopic compositions encompass wide ranges, that whole-rock isotopic compositions are consequently simply element-weighted averages of the heterogeneous crystal cargo, and that open-system evolution is proved by core–rim variations in Sr isotope ratios. Nguaruhoe is just one of many systems examined through microanalytical approaches. The overwhelming conclusion of these studies is that crystal cargoes are not truly phenocrystic, but are inherited from various sources. The implication of this realization is that the interpretation of whole-rock isotopic data, including the currently popular U-series, needs careful evaluation in the context of petrographic observations.

References

Bacon, C.R., Adami, L.H., Lanphere, M.A., 1989. Direct evidence
for the origin of low-18O silicic magmas: quenched samples of a
magma chamber’s partially-fused granitoid walls, Crater Lake,
Oregon. Earth Planet. Sci. Lett. 96, 199– 208.
Bacon, C.R., Bruggman, P.E., Christiansen, R.L., Clynne, M.A.,
Donnelly-Nolan, J.M., Hildreth, W., 1997. Primitive magmas at
five cascades volcanic fields: melts from hot, heterogeneous
sub-arc mantle. Can. Mineral. 35, 397– 424.
Bebout, G.E., Ryan, J.G., Leeman, W.P., Bebout, A.E., 1999.
Fractionation of trace elements by subduction-zone metamorphism—
effect of convergent margin thermal evolution. Earth
Planet. Sci. Lett. 171, 63– 81.
Costa, F., Chakraborty, S., Dohmen, R., 2003. Diffusion coupling
between trace and major elements and a model for calculation of
magma residence times using plagioclase. Geochim. Cosmochim.
Acta 67, 2189– 2200.
Danyushevsky, L.V., Sokolov, S., Falloon, T.J., 2002. Melt
inclusions in olivine phenocrysts: using diffusive re-equilibration
to determine the cooling history of a crystal, with
implications for the origin of olivine-phyric volcanic rocks.
J. Petrol. 43, 1651– 1671.
Davidson, J.P., 1986. Isotopic and trace element constraints on the
petrogenesis of subduction-related lavas from Martinique,
Lesser Antilles. J. Geophys. Res. 91, 5943– 5962.
Davidson, J.P., 1987. Crustal contamination versus subduction zone
enrichment: examples from the Lesser Antilles and implications
for mantle source compositions of island arc volcanics. Geochim.
Cosmochim. Acta 51, 2185–2198.
Davidson, J.P., 1991. Comment on bRole of subduction erosion in
the generation of Andean magmasQ by C.R. Stern. Geology 19,
1054–1055.
Davidson, J.P., 1996. Deciphering mantle and crustal signatures in
subduction zone magmatism. In: Bebout, G.E., Scholl, D.W.,
Kirby, S.H., Platt, J.P. (Eds.), Subduction: Top to Bottom.
Monogr. Am. Geophys. Union, vol. 96, pp. 251– 262.
Davidson, J.P., Tepley III, F.J., 1997. Recharge in volcanic systems;
evidence from isotope profiles of phenocrysts. Science 275,
826–829.
Davidson, J.P., Ferguson, K.M., Colucci, M.T., Dungan, M.A.,
1988. The origin and evolution of magmas from the San
Pedro-Pellado Volcanic Complex, S. Chile: Multicomponent
sources and open system evolution. Contrib. Mineral. Petrol.
100, 429– 445.
Davidson, J.P., McMillan, N.J., Moorbath, S., Worner, G., Harmon,
R.S., Lopez-Escobar, L., 1990. The Nevados de Payachata
volcanic region (188S, 698W, N. Chile): II Evidence for
widespread crustal involvement in Andean magmatism. Contrib.
Mineral. Petrol. 105, 412– 432.
Dungan, M.A., Davidson, J.P., 2004. Partial assimilative recycling
of the mafic plutonic roots of arc volcanoes: An example from
the Chilean Andes. Geology 32, 773– 776.
Dungan, M.A., Wulff, A., Thompson, R., 2001. Eruptive stratigraphy
of the Tatara–San Pedro Complex 368S, Southern
Volcanic Zone, Chilean Andes: reconstruction method and
implications for magma evolution at long-lived arc volcanic
centers. J. Petrol. 42, 555– 626.
Eggins, S.M., 1993. Origin and evolution of picritic arc magmas,
Ambae (Aoba), Vanuatu. Contrib. Mineral. Petrol. 114, 79– 90.
Eichelberger, J.C., 1978. Andesitic volcanism and crustal evolution.
Nature 275, 21– 27.
Elliot, T., Plank, T., Zindler, A., White, W., Bourdon, B., 1997.
Element transport from slab to volcanic front at the Mariana arc.
J. Geophys. Res. 102, 14991–15019.
Feeley, T.C., Davidson, J.P., 1994. Petrology of calk-alkaline lavas
at Volcan Ollague and the origin of compositional diversity at
central Andean stratovolcanoes. J. Petrol. 35, 1295–1340.
Gamble, J.A., Wood, C.P., Price, R.C., Smith, I.E.M., Stewart,
R.B., Waight, T., 1999. A fifty year history of magmatic
evolution on Ruapehu Volcano, New Zealand: verification of
open system behaviour in an arc volcano. Earth Planet. Sci.
Lett. 170, 301– 314.
Garrison, J., Davidson, J., Turner, S., Reid, M., 2003. Recycling of
the Chalupas pluton at Cotopaxi Volcano, NVZ, Ecuador:
evidence from U–Th disequilibria. Geophys. Res. Abstr. 5,
No. 11998.
Gill, J.B., 1981. Orogenic Andesites and Plate Tectonics. Springer-
Verlag, New York.
Ginibre, C., Kronz, A., Wfrner, G., 2002. High-resolution
quantitative imaging of plagioclase composition using
accumulated back-scattered electron images: new constraints
on oscillatory zoning. Contrib. Mineral. Petrol. 142,
436– 448.
Harmon, R.S., Barreiro, B.A., Moorbath, S., Hoefs, J., Francis,
P.W., Thorpe, R.S., Deruelle, B., McHugh, J., Viglino, J.A.,
1984. Regional O–Sr- and Pb isotope relationships in late
Cenozoic calc-alkaline lavas of the Andean Cordillera. J. Geol.
Soc. (Lond.) 141, 803–822.
Harris, C., 1989. Covariance of initial 87Sr/86Sr ratios d18O, and
SiO2 in continental basalt suites: the role of contamination and
alteration. Geology 17, 634–636.
Hawkesworth, C.J., Blake, S., Evans, P., Hughes, R., Macdonald,
R., Thomas, L., Turner, S., Zellmer, G., 2000. The time
scales of fractionation in magma chambers—integrating
physical, isotopic and geochemical perspectives. J. Petrol. 41,
991– 1006.
Hildreth, W., Moorbath, S., 1988. Crustal contributions to arc
magmatism in the Andes of Central Chile. Contrib. Mineral.
Petrol. 98, 455– 499.
Hora, J.M., 2003. Magmatic differentiation processes at Ngauruhoe
Volcano, New Zealand: Constraints from chemical, isotopic and
textural analysis of plagioclase crystal zoning. Unpubl. MSc
thesis, Univ. of California, Los Angeles.
James, D.E., 1981. The combined use of oxygen and radiogenic
isotopes as indicators of crustal contamination. Annu. Rev.
Earth Planet. Sci. 9, 311 –344.
James, D.E., 1982. A combined O, Sr, Nd and Pb isotopic and trace
element study of crustal contamination in the central Andean
lavas: I. Local geochemical variations. Earth Planet. Sci. Lett. 57,
47– 62.
James, D.J., Murcia, L.A., 1984. Crustal contamination in northern
Andean volcanics. J. Geol. Soc. (Lond.) 141, 823– 830.
Macpherson, C.G., Gamble, J.A., Mattey, D.P., 1998. Oxygen
isotope geochemistry of an oceanic to continental arc transition,
Kermadec–Hikurangi margin, SW Pacific. Earth Planet. Sci.
Lett. 160, 609– 621.
Margaritz, M., Whitford, D.J., James, D.E., 1978. Oxygen isotopes
and the origin of high 87Sr/86Sr andesites. Earth Planet. Sci. Lett.
40, 220–230.
Marsh, B.D., 1998. On the interpretation of crystal size distributions
in magmatic systems. J. Petrol. 39, 553–599.
Mattey, D.P., Lowry, D., Macpherson, C.G., 1994. Oxygen isotope
composition of mantle peridotite. Earth Planet. Sci. Lett. 128,
231– 241.
Morgan, D., Blake, S., Rogers, N., DeVivo, B., Rolandi, G.,
Macdonald, R., Hawkesworth, C., 2004. Time scales of crystal
residence and magma chamber volume from modelling of
diffusion profiles in phenocrysts: Vesuvius 1944. Earth Planet.
Sci. Lett. 222, 933– 946.
Nye, C.J., Reid, M.R., 1986. Geochemistry of primary and leastfractionated
lavas from Okmok Volcano, central Aleutians:
implications for arc magma genesis. J. Geophys. Res. 91 (10),
10271–10287.
Perfit, M.R., Gust, D.A., Bence, A.E., Arculus, R.J., Taylor, S.R.,
1980. Chemical characteristics of island arc basalts: implications
for mantle sources. Chem. Geol. 30, 227–256.
Plank, T., Langmuir, C.H., 1993. Tracing trace elements from
sediment input to volcanic output at subduction zones. Nature
362, 739–743.
Price, R.C., Stewart, R.B., Woodhead, J.D., Smith, I.E.M., 1999.
Petrogenesis of high-K Arc magmas: evidence from Egmont
Volcano, North Island, New Zealand. J. Petrol. 40, 167– 197.
Ramos, F.C., 2000. Processes and mantle sources generating
basaltic volcanism: insights from Th isotopes. Unpubl. PhD
thesis, Univ. of California, Los Angeles.
Reagan, M.K., Sims, K.W., Ericjh, J., Thomas, R.B., Cheng, H.,
Edwards, R.L., Layne, G., Ball, L., 2003. Time scales of
differentiation from mafic parents to rhyolite in North American
continental arcs. J. Petrol. 44, 1703– 1726.
Rudnick, R.L., Fountain, D.M., 1995. Nature and composition of
the continental crust: a lower crustal perspective. Rev. Geophys.
33, 267– 309.
Singer, B.S., Dungan, M.A., Layne, G.D., 1995. Textures and Sr,
Ba, Mg, Fe, K, and Ti compositional profiles in volcanic
plagioclase: clues to the dynamics of calc-alkaline magmas
chambers. Am. Mineral. 80, 776– 798.
Sobolev, A.V., Chaussidon, M., 1996. H2O concentrations in
primary melts from island arcs and mid ocean ridges:
implications for H2O storage and recycling in the mantle. Earth
Planet. Sci. Lett. 137, 45– 55.
Taylor, H.P., Sheppard, S.F., 1986. Igneous rocks: I. Processes
of isotopic fractionation and isotope systematics. In: Valley,
J.W., Taylor, H.P., O’Neil, J.R. (Eds.), Stable Isotopes in
High-Temperature Geological Processes. Rev. Mineral. 16,
227– 269.
Tepley III, F.J., Davidson, J.P., Clynne, M.A., 1999. Magmatic
interactions as recorded in plagioclase phenocrysts of Chaos
Crags, Lassen Volcanic Center, California. J. Petrol. 40,
787– 806.
Tepley III, F.J., Davidson, J.P., Tilling, R.I., Arth, J.G., 2000. Magma
mixing, recharge and eruption histories recorded in plagioclase
phenocrysts from El Chichon volcano, Mexico. J. Petrol. 41,
1397– 1411.
Turner, S., Hawkesworth, C., 1997. Constraints on flux rates and
mantle dynamics beneath island arcs from Tonga–Kermadec
lava geochemistry. Nature 389, 568– 573.
Turner, S., George, R., Jerram, D., Carpenter, N., Hawkesworth, C.,
2003a. Some case studies of plagioclase growth and residence
times in island arc lavas from the Lesser Antilles and Tonga, and
a model to reconcile apparently disparate age information. Earth
Planet. Sci. Lett. 214, 279–294.
Turner, S., Bourdon, B., Gill, J., 2003b. Insights into magma
genesis at convergent margins from U-series isotopes. In:
Bourdon, B., Henderson, G.M., Lundstrom, C.C., Turner, S.P.
(Eds.), Uranium-Series Geochemistry. Rev. Mineral. 52,
255– 315.
Wallace, G.S., Bergantz, G.W., 2002. Wavelet-based correlation
(WBC) of zoned crystal populations and magma mixing. Earth
Planet. Sci. Lett. 202, 133–145.
White, W.M., Patchett, P.J., 1984. Hf–Nd–Sr isotopes and incompatible
element abundances in island arcs: implications for
magma origins and crust–mantle evolution. Earth Planet. Sci.
Lett. 67, 167– 185.
Wfrner, G., Moorbath, S., Harmon, R.S., 1992. Andean Cenozoic
volcanic centers reflect basement isotopic domains. Geology 20,
1103–1106.
Zellmer, G.F., Blake, S., Vance, D., Hawkesworth, C., Turner, S.,
1999. Plagioclase residence times at two island arc volcanoes
(Kameni Islands, Santorini, and Soufriere, St Vincent) determined
by Sr diffusion systematics. Contrib. Mineral. Petrol.
136, 345– 357.