| Literature DB >> 17395795 |
Alexander V Sobolev1, Albrecht W Hofmann, Dmitry V Kuzmin, Gregory M Yaxley, Nicholas T Arndt, Sun-Lin Chung, Leonid V Danyushevsky, Tim Elliott, Frederick A Frey, Michael O Garcia, Andrey A Gurenko, Vadim S Kamenetsky, Andrew C Kerr, Nadezhda A Krivolutskaya, Vladimir V Matvienkov, Igor K Nikogosian, Alexander Rocholl, Ingvar A Sigurdsson, Nadezhda M Sushchevskaya, Mengist Teklay.
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.Entities:
Year: 2007 PMID： 17395795 DOI： 10.1126/science. 1138113
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728