Publication Date:
2007-03-31
Description:
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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sobolev, Alexander V -- Hofmann, Albrecht W -- Kuzmin, Dmitry V -- Yaxley, Gregory M -- Arndt, Nicholas T -- Chung, Sun-Lin -- Danyushevsky, Leonid V -- Elliott, Tim -- Frey, Frederick A -- Garcia, Michael O -- Gurenko, Andrey A -- Kamenetsky, Vadim S -- Kerr, Andrew C -- Krivolutskaya, Nadezhda A -- Matvienkov, Vladimir V -- Nikogosian, Igor K -- Rocholl, Alexander -- Sigurdsson, Ingvar A -- Sushchevskaya, Nadezhda M -- Teklay, Mengist -- New York, N.Y. -- Science. 2007 Apr 20;316(5823):412-7. Epub 2007 Mar 29.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max Planck Institute (MPI) for Chemistry, Post Office Box 3060, 55020 Mainz, Germany. sobolev@geokhi.ru〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17395795" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
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Chemistry and Pharmacology
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Computer Science
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Medicine
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Natural Sciences in General
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Physics
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