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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. http://resolver.caltech.edu/CaltechAUTHORS:20120830-145528222

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Abstract

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.


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Additional Information:© 2003 Pergamon-Elsevier Science Ltd.
Record Number:CaltechAUTHORS:20120830-145528222
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120830-145528222
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33721
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 Aug 2012 22:31
Last Modified:23 Jul 2013 17:54

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