Browsing by Author "O'Hara M.J."
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Browsing by Author "O'Hara M.J."
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O'Hara M.J. (2000)The popular interpretation of lunar maria, as sequences of primary picritic flood basalts derived by remelting a mantle that had accumulated from a global magma ocean, has many unsatisfactory aspects. The expertise of Keith ...
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O'Hara M.J.; Fry N. (1996)This is a study of the effect of solidifying a magma body by partial crystallization of a series of small packets of liquid, mixing the residual liquid into the main body of liquid before repeating the process. It confirms ...
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O'Hara M.J. (1995)Imperfections in the perfect fractional melting (PFM) process can ameliorate the drastic “stripping” of incompatible trace elements from the residue which characterises ideal PFM, and the consequent catastrophic collapse ...
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Niu Y.; O'Hara M.J.; Pearce J.A. (2003)Tonga and Mariana forearc peridotites, inferred to represent their respective subarc lithospheres, are compositionally highly depleted (low Fe/Mg) and thus physically buoyant relative to abyssal peridotites representing ...
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O'Hara M.J.; Herzberg C. (2002)The concentrations and ratios of the major elements determine the physical properties and the phase equilibria behavior of peridotites and basalts in response to the changing energy contents of the systems. The behavior ...
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Herzberg C.; O'Hara M.J. (1998)Experimental phase equilibrium studies at pressures ranging from 1 atm to 10 GPa are sufficient to constrain the origin of igneous rocks formed along oceanic ridges and in hotspots. The major element geochemistry of MORB ...
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THE EFFECT OF PRESSURE-INDUCED SOLID-SOLID PHASE TRANSITIONS ON DECOMPRESSION MELTING OF THE MANTLE Asimow P.D.; Hirschmann M.M.; Ghiorso M.S.; O'Hara M.J.; Stolper E.M. (1995)Pressure-release melting of the earth's mantle is thought to be an isentropic process. The intersection of an isentropic melting path with a solid-state phase transition affecting the residual minerals must result in some ...
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O'Hara M.J.; Fry N. (1996)Field relations in dissected volcanic terrains and the internal evidence of persistent low-pressure cotectic character in erupted basalts point to the frequent and substantial modification of liquid compositions by some ...
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O'Hara M.J. (1995)The mixing (integration) of liquids obtained as different mass fractions of partial melting from source material of the same bulk composition, travelling along different mantle flow-lines through a melting regime, can ...
Now showing items 1-9 of 9