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Earth sciences

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Evidence for a reduced, Fe-depleted martian mantle source region of shergottites

Article Abstract:

A study indicates that the source region of martian shergottites is greatly less oxidized and less Fe-enriched than previously reported values and is depleted even more in other major elements. The discrepancies in the shergottite source region values suggest that the source region is due to an extensive batch-melting of a more fertile mantle. The constraint on the shergottite source region's depth estimate also suggests the formation from a body bigger than an asteroid.

Mars (Planet), Natural history, Meteorites

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Thermodynamics of feldspathoid solutions

Article Abstract:

A study developed models for the thermodynamics of nephelines, kalsilites and leucites in the simple system NaAlSiO4 - KAlSiO4 - Ca0.5AlSiO4 - SiO2 - H2O. The crystallization of nephelines, kalsilites and leucites from lavas was investigated using a revised MELTS software package to test the consistency of the models. Results showed that crystallization of nepheline-kalsilite and leucite solutions is several lava series can accurately be predicted by the revised MELTS.

Silicates

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A revised and internally consistent thermodynamic model for the interpolation and extrapolation of liquid-solid equilibria in magmatic systems at elevated temperatures and pressures

Article Abstract:

A regular solution-type thermodynamic model, for twelve component silicate liquids, can be used for natural hydrous and anhydrous magmatic compositions. The temperature is in the range of 900 to 1700 degrees centigrade and pressures up to four GPa. Simulation of igneous processes, such as fractional crystallization and degassing of volatiles, can be done using the model, which is used as a software package.

Models, Usage, Software, Magma

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