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

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Sobolev, AV and Hofmann, AW and Kuzmin, DV and Yaxley, GM and Arndt, NT and Chung, SL and Danyushevsky, LV and Elliott, T and Frey, FA and Garcia, MO and Gurenko, AA and Kamenetsky, VS and Kerr, AC and Krivolutskaya, NA and Matvienkov, VV and Nikogosian, I and Rocholl, A and Sigurdsson, IA and Sushchevskaya, NM 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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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
Journal or Publication Title: Science
Page Range: pp. 412-417
ISSN: 0036-8075
Identification Number - DOI: 10.1126/science. 1138113
Date Deposited: 04 Dec 2007 04:26
Last Modified: 18 Nov 2014 03:25
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