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American Journal of Science OCTOBER 2007
 

Summary: American Journal of Science
OCTOBER 2007
INSIGHTS INTO MANTLE MELTING FROM GRAPHICAL ANALYSIS OF
ONE-COMPONENT SYSTEMS
EDWARD STOLPER and PAUL ASIMOW
Division of Geological and Planetary Sciences, California Institute of Technology
Pasadena, California 91125 USA; ems@gps.caltech.edu
1. ABSTRACT. Decompression melting can be approximated as an isentropic (that
is, reversible adiabatic) process. In such a process, specific entropy (S) and pressure
(P) are the independent variables and equilibrium is achieved when the specific
enthalpy (H) of the system reaches a minimum. We present a largely graphical analysis
of decompression melting in one-component systems based on phase equilibria in
H-P-S space. Although mantle sources contain more than one component, use of
one-component model systems provides insights into several aspects of mantle melting
that can be generalized to more complete and complex systems (for example, batch vs.
fractional fusion; the influence of pressure-dependent solid-solid reactions on melting;
melting of multilithologic mixtures such as peridotite plus eclogite; advection of heat
and melting by rising magmas) and places these insights into the visualizable frame-
work of simple phase diagrams.
2. introduction

  

Source: Asimow, Paul D. - Division of Geological and Planetary Sciences, California Institute of Technology,

 

Collections: Geosciences