Extraction of mid-ocean-ridge basalt from the upwelling mantle by focused flow of melt in dunite channels
Article Abstract:
The formation of melt conduits and melt transport in these conduits is through porous flow and the incremental melts that coalesce and mix to form mid-ocean-ridge basalt (MORB) which is then transported to the earth's crust. The peridotites in the Oman ophiolite are not in equilibrium with the MORB but the Oman dunites are, indicating that the dunites act as transports for the melt. The dunites are formed by the reaction of the melts moving up and the mantle peridotite in an upwelling asthenospheric mantle below an oceanic ridge. The channels so formed are the means of mass transport from the Earth's core to the crust.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Formation of harzburgite by pervasive melt/rock reaction in the upper mantle
Article Abstract:
The mantle lithosphere's reaction with rising melts best explains the composition of peridotite samples from the Earth's mantle. The hypothesis that the partial melting of primitive mantle material may account for the compositions is deficient for two reasons: the samples contain too much orthopyroxene and have light-to-heavy rare earth element ratios that are too high. The melt/rock reaction, in which ascending magma and mantle wall rock generate dunite, harzburgite and pyroxene-abundant lherzolite is the preferable model.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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A periodic shear-heating mechanism for intermediate-depth earthquakes in the mantle
Article Abstract:
The study presents an alternative, periodic shear-heating mechanism to investigate and study the intermediate-depth earthquakes in the subduction zones, which occur below the brittle-ductile transition, where frictional failure is caused due to high pressures. The analysis reveals that the strain rate and the temperature increases drastically with an increase in the shear heating of the mantle, which leads to various far-field deformations, producing a quasi-periodic series of instabilities.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2007
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