The Amount of Recycled Crust in Sources of Mantle-Derived Melts

Author:

Sobolev Alexander V.12345,Hofmann Albrecht W.12345,Kuzmin Dmitry V.12345,Yaxley Gregory M.12345,Arndt Nicholas T.12345,Chung Sun-Lin12345,Danyushevsky Leonid V.12345,Elliott Tim12345,Frey Frederick A.12345,Garcia Michael O.12345,Gurenko Andrey A.12345,Kamenetsky Vadim S.12345,Kerr Andrew C.12345,Krivolutskaya Nadezhda A.12345,Matvienkov Vladimir V.12345,Nikogosian Igor K.12345,Rocholl Alexander12345,Sigurdsson Ingvar A.12345,Sushchevskaya Nadezhda M.12345,Teklay Mengist12345

Affiliation:

1. Max Planck Institute (MPI) for Chemistry, Post Office Box 3060, 55020 Mainz, Germany.

2. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygin Street 19, 119991 Moscow, Russia.

3. Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Koptuyga prospekt 3, 630090 Novosibirsk, Russia.

4. Research School of Earth Sciences, Australian National University, Canberra, ACT 0200 Australia.

5. Laboratoire de Géodynamique des Chaînes Alpines, Université de Grenoble, 38401 Grenoble cedex, France.

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference43 articles.

1. Mantle plumes from ancient oceanic crust

2. A. W. Hofmann, in The Mantle and Core, vol. 2 of Treatise on Geochemistry, H. D. Holland, K. K. Turekian, Eds. (Elsevier, Amsterdam, 2003), p. 61.

3. Major-element variability in the Hawaiian mantle plume

4. Plume-Associated Ultramafic Magmas of Phanerozoic Age

5. An olivine-free mantle source of Hawaiian shield basalts

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