The amount of recycled crust in sources of mantle-derived melts

Sobolev, A.V. and Hofmann, A.W. and Kuzmin, D.V. and Yaxley, G.M. and Arndt, N.T. and Chung, S-L. and Danyushevsky, L.V. and Elliot, T. and Frey, F.A. and Garcia, M.O. and Gurenko, A.A. and Kamenetsky, V.S. and Kerr, A.C. and Krivolutskaya, N.A. and Matvienkov, V.V. and Nikogosian, I. and Rocholl, A. and Sigurdsson, I.A. and Sushchevskaya, N.M. and Teklay, M. (2007) The amount of recycled crust in sources of mantle-derived melts. Science, 316 (5823). pp. 412-417. ISSN 0036-8075

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Official URL: http://dx.doi.org/10.1126/science. 1138113

Abstract

Plate tectonic processes introduce basaltic crust ( as eclogite) into the peridotitic mantle. The proportions of these two sources in mantle melts are poorly understood. Silica-rich melts formed from eclogite react with peridotite, converting it to olivine-free pyroxenite. Partial melts of this hybrid pyroxenite are higher in nickel and silicon but poorer in manganese, calcium, and magnesium than melts of peridotite. Olivine phenocrysts' compositions record these differences and were used to quantify the contributions of pyroxenite-derived melts in mid-ocean ridge basalts ( 10 to 30%), ocean island and continental basalts ( many > 60%), and komatiites ( 20 to 30%). These results imply involvement of 2 to 20% ( up to 28%) of recycled crust in mantle melting.

Item Type:	Article
Keywords:	Olivine, nickel, Mid-ocean ridge basalt, ocean island basalts, mantle, garnet pyroxenite, phase-relations, hawaiian plume, peridotite, eclogite, lithosphere, melting
Subjects:	260000 Earth Sciences > 260200 Geophysics 260000 Earth Sciences > 260300 Geochemistry 260000 Earth Sciences > 260100 Geology
ID Code:	2614
Deposited By:	Prof Vadim Kamenetsky
Deposited On:	04 Dec 2007 15:26
Last Modified:	09 Jan 2008 02:30
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