Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..767l&link_type=abstract
Lunar and Planetary Science, volume 27, page 767
Computer Science
2
Basalt: High-Titanium, Basalt: Mare, Density, Fractional Fusion, Glass: Volcanic
Scientific paper
New experiments at 25 and 30 kb help to define the ilmenite saturation surface in liquids relevant to melting of the mare basalt source region. These data have been incorporated into new calculations of polybaric fractional fusion. The calculations show that it is possible to generate composite liquids, similar in composition to the very-high-Ti (VHT) red and black volcanic glasses, by the same process of polybaric fractional fusion proposed for the very-low-Ti green glasses by [1]. The only important difference is the composition of the VHT source, which was the result of adding 10 % of a 1:1 mixture of ilmenite and clinopyroxene to the green glass source composition of Longhi (1992) Lunar Planet. Sci. XXII, 343-353. However, calculated densities of the instantaneous melts are distinctively higher than those of the depleting source. As the melt sinks through the rising source, it freezes and becomes denser still. In order to generate the VHT magmas, the frozen VHT primary melts must remain within the source. To do this, the frozen melt must remain in discrete, isolated lenses rather than accumulate into a single mass.
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