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The amount of recycled crust in sources of mantle-derived melts
journal contribution
posted on 2023-05-16, 21:35 authored by Sobolev, AV, Hofmann, AW, Kuzmin, DV, Yaxley, GM, Arndt, NT, Chung, SL, Leonid Danyushevsky, Elliot, T, Frey, FA, Garcia, MO, Gurenko, AA, Vadim KamenetskyVadim Kamenetsky, Kerr, AC, Krivolutskaya, NA, Matvienkov, VV, Nikogosian, IK, Rocholl, A, Sigurdsson, IA, Sushchevskaya, NM, Teklay, MPlate 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.
History
Publication title
ScienceVolume
316Issue
5823Pagination
412-417ISSN
0036-8075Department/School
School of Natural SciencesPublisher
American Association for the Advancement of SciencePlace of publication
USARepository Status
- Restricted