Calculation of Peridotite Partial Melting from Thermodynamic Models of Minerals and Melts, IV. Adiabatic Decompression and the Composition and Mean Properties of Mid-ocean Ridge Basalts |
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| Authors: | ASIMOW P D; HIRSCHMANN M M; STOLPER E M |
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| Institution: | 1DIVISION OF GEOLOGICAL AND PLANETARY SCIENCES, CALIFORNIA INSTITUTE OF TECHNOLOGY M/C 170-25, PASADENA, CA 91125, USA
2DEPARTMENT OF GEOLOGY AND GEOPHYSICS, UNIVERSITY OF MINNESOTA, 310 PILLSBURY DRIVE SE, MINNEAPOLIS, MN 55455-0219, USA |
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| Abstract: | Composition, mean pressure, mean melt fraction, and crustalthickness of model mid-ocean ridge basalts (MORBs) are calculatedusing MELTS. Polybaric, isentropic batch and fractional meltsfrom ranges in source composition, potential temperature, andfinal melting pressure are integrated to represent idealizedpassive and active flow regimes. These MELTS-derived polybaricmodels are compared with other parameterizations; the resultsdiffer both in melt compositions, notably at small melt fractions,and in the solidus curve and melt productivity, as a resultof the self-consistent energy balance in MELTS. MELTS predictsa maximum mean melt fraction ( |
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