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Thermodynamic modelling of melting in chemically heterogenous mixtures of peridotite and pyroxenite

Smith, P. M. and Asimow, Paul D. and Stolper, E. M. (2003) Thermodynamic modelling of melting in chemically heterogenous mixtures of peridotite and pyroxenite. Geochimica et Cosmochimica Acta, 67 (18). A440. ISSN 0016-7037.

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Melting of pyroxenite veins or layers has been proposed as an explanation for the 'garnet signature' in MORB and for characteristic source signatures in OIB. Recent experiments have constrained the melt productivity of respresentative pyroxenite compositions but pyroxenite melting in the convecting mantle will be enhanced by heat transfer from the surrounding peridotite. The algorithm DUAL ADIABA T is based on the MELTS software package. - It calculates isentropic decompression paths for two lithologies that are in thermal but not chemical equilibrium. We have used DUAL_ADIABAT to compare the melting of variable proportions of pyroxenite and peridotite along typical mantle adiabats with and without chemical equilibrium between the systems. The effects of melt extraction, homogenisation and transport processes and melt-region geometry may be tested.

Item Type:Article
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Asimow, Paul D.0000-0001-6025-8925
Stolper, E. M.0000-0001-8008-8804
Additional Information:© 2003 Pergamon-Elsevier Science Ltd.
Issue or Number:18
Record Number:CaltechAUTHORS:20120830-145528222
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33721
Deposited By: Tony Diaz
Deposited On:30 Aug 2012 22:31
Last Modified:03 Oct 2019 04:12

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