A one-plume model of martian mantle convection
Article Abstract:
A three-dimensional convection model incorporating an endothermic phase transition close to the core-mantle boundary is used to analyze the convective evolution of the martian mantle. The results show the development of a single-plume pattern of convection on Mars consistent with the volcanic distribution, gravity field shape and the gross tectonic stress pattern of the planet. Thermal convection in the martian mantle is unlike that in the Earth. A single large upswelling region exists beneath the Tharsis region of Mars.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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Scum of the Earth after all
Article Abstract:
Heat released by earth plates via conduction into the atmosphere and oceans is responsible for the formation of continents. Greater heat loss makes for increased arc subduction sites and thus more continental crust. Sedimentary rocks are proof of initiation of the continental crust. Sweeping together of many island arcs in oceans generates individual continents. Submarine oceanic plateaus promote arc volcanism to give arc-magma, which results in rock-mass formation due to plume-generated plateau.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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High (sup)3He/(sup)4He ratios in picritic basalts from Baffin Island and the role of a mixed reservoir in mantle plumes
Article Abstract:
Research indicates that olivine phenocrystals in picritic basalts exhibit the highest magnetic (sup)3He/(sup)4He ratios and basalts rich in (sup)3He are derived from melts of depleted upper-mantle rocks, suggesting that a (sup)3He-recharged depleted mantle reservoir may be the main source of high (sup)3He/(sup)4He ratios in mantle plumes.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
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