Computer Science
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012gecoa..79....1k&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 79, p. 1-19.
Computer Science
Scientific paper
High pressure and high temperature experiments were carried out on two pristine ultramafic high titanium glass compositions from the Moon. The investigated compositions are the Apollo 15 red glass (13.8 wt% TiO2) and Apollo 17 orange glass (9.1 wt% TiO2). Temperatures spanned the range of 1320-1570 °C, and pressures 0.8-3.3 GPa. Graphite and iron metal capsules were used to control f at iron-wüstite (ΔIW) + 1.3 log units to ΔIW-2.1, respectively. Multiple saturation with olivine and orthopyroxene on the liquidus occurs at 1.2 GPa and 1350 °C for the red glass, and 2.5 GPa and 1530 °C for the orange glass in graphite capsules. In Fe capsules the multiple saturation points (MSP) shift to higher pressure, and are 2.2 GPa and 1450 °C for the red glass, and 3.1 GPa and 1560 °C for the orange glass. The magnitude of the shift in MSP increases with increasing TiO2 content. The changes in MSP are caused by f and correspond to a ˜200 km shift in the estimated minimum depth of origin for the red glass, and up to a 300 km range in depth between the red and orange glass depth of origin. Using independent estimates of f for the orange glass source region of ΔIW-0.6 (Sato, 1979; Nicholis and Rutherford, 2009), interpolation of our phase stability data yields a pressure of multiple saturation of 2.8 GPa. Our results confirm that the red and orange glasses are buoyant with respect to model lunar interior assemblages at their multiple saturation pressures. The difference in the pressure of liquidus multi-phase saturation is possibly due to a shift in the Ti-Fe coordination in high-Ti melts. Evidence for this coordination change comes from systematic changes in olivine-melt Fe-Mg KD's with f, pressure, temperature, and TiO2 content.
Grove Timothy L.
Krawczynski Michael J.
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