Journal ArticleDOI
The Amount of Recycled Crust in Sources of Mantle-Derived Melts
Alexander V. Sobolev,Albrecht W. Hofmann,D. V. Kuzmin,Gregory M. Yaxley,Nicholas 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 Krivolutskaya,Vladimir V. Matvienkov,Igor K. Nikogosian,Igor K. Nikogosian,Alexander Rocholl,I. A. Sigurdsson,N. M. Sushchevskaya,Mengist Teklay +20 more
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TLDR
Olivine phenocrysts' compositions record differences in the contributions of pyroxenite-derived melts in mid-ocean ridge basalts, which imply involvement of 2 to 20% (up to 28%) of recycled crust in mantle melting.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.read more
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Journal ArticleDOI
Continental and Oceanic Crust Recycling-induced Melt^Peridotite Interactions in the Trans-North China Orogen: U^Pb Dating, Hf Isotopes and Trace Elements in Zircons from Mantle Xenoliths
TL;DR: In this article, the first finding of continental crust-derived Precambrian zircons in garnet/spinel pyroxenite veins within mantle xenoliths carried by the Neogene Hannuoba basalt in the central zone of the North China Craton (NCC).
Journal ArticleDOI
Thermal history of the Earth and its petrological expression
TL;DR: In this paper, the authors show that the mantle was warming in deep Archean-Hadean time because internal heating exceeded surface heat loss, and it has been cooling from 2.5 to 3.0 Ga to the present.
Journal ArticleDOI
Metasomatized lithosphere and the origin of alkaline lavas.
TL;DR: It is concluded that melting of metasomatized lithosphere is a viable alternative to models of alkaline basalt formation by melting of recycled oceanic crust with or without sediment.
Journal ArticleDOI
Linking mantle plumes, large igneous provinces and environmental catastrophes
Stephan V. Sobolev,Alexander V. Sobolev,D. V. Kuzmin,Nadezhda Krivolutskaya,Alexey G. Petrunin,Nicholas Arndt,Viktor A. Radko,Yuri R. Vasiliev +7 more
TL;DR: This paper presented petrological evidence for a large amount of dense recycled oceanic crust in the head of the plume and developed a thermomechanical model that predicts no pre-magmatic uplift and requires no lithospheric extension.
Journal ArticleDOI
Petrology of some oceanic island basalts: PRIMELT2.XLS software for primary magma calculation
Claude Herzberg,Paul D. Asimow +1 more
TL;DR: The PRIMELT2.XLS software as discussed by the authors is an upgrade over a previous version in that it includes garnet peridotite melting and it detects complexities that can lead to overestimates in mantle potential temperature by >100°C.
References
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Journal ArticleDOI
The composition of the Earth
William F. McDonough,Shen-Su Sun +1 more
TL;DR: In this paper, the authors compared the relative abundances of the refractory elements in carbonaceous, ordinary, and enstatite chondritic meteorites and found that the most consistent composition of the Earth's core is derived from the seismic profile and its interpretation, compared with primitive meteorites, and chemical and petrological models of peridotite-basalt melting relationships.
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The Volume and Composition of Melt Generated by Extension of the Lithosphere
Dan McKenzie,Mike J. Bickle +1 more
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Reaction between slab-derived melts and peridotite in the mantle wedge: experimental constraints at 3.8 GPa
TL;DR: In this paper, a set of experiments on natural, hydrous basalts at 1-4 GPa constrain the composition of "unadulterated" partial melts of eclogitized oceanic crust within downgoing lithospheric slabs in subduction zones, where these same adakite melts are allowed to infiltrate and react with an overlying layer of peridotite.
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Melting of Garnet Peridotite and the Origin of Komatiite and Depleted Lithosphere
TL;DR: In this paper, a pyrolitic GPa from a mantle enriched in SiO2 relative to pyrolite was made from 3 to 7 GPa in piston-cylinder and multi-anvil apparatus.
Journal ArticleDOI
Reference Samples for Electron Microprobe Analysis
TL;DR: In this paper, chemical analyses of twenty-six minerals, four natural glasses, and one synthetic glass were presented for use as microprobe reference samples, and details of sample preparation were described and homogeneity of the samples has been tested by the homogeneity index.