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• W1645677935 abstract "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 [I]. 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 [I]. 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. Three melting experiments in Fe-capsules have helped to define the high-pressure ilmenite saturation surface (Table 1). The two ilmenite-saturated runs have Mg'Oiq) lower (w.3) than expected for the mare source. Predictably, ilmenite-saturated liquids with higher Mg' would have higher concentrations of Ti02 as borne out by the TI1 195-1 liquid with 21.8% Ti02 and no ilmenite. Similarly, garnet saturation in the low-Mg' 30 kb run is at 4.9 wt % A1203, whereas there is no garnet in the higher Mg' run despite higher A1203 (5.6 %) in the liquid. As a simulation of ilmenite-clinopyroxene masses settling into the lunar interior and mixing with more primitive cumulates, the composition of the hl-Ti mare basalt source region was approximated as that of the green glass source region [I] plus 10 wt% of a 1: 1 mixture of ferroan clinopyroxene and ilmenite. The VHT source is thus a mixture of two cumulates. A calculation of polybaric fractional fusion was made for the hybrid source with the same parameters that proved successful for the green glass magma: initial melting a 40 kb, 1 mol % meltlkb of decompression, 50 % of the melt retained in the source at each step. Results of the calculations are shown in Fig. 1. Instantaneous melts are open squares; pooled melts are filled squares. The composition of the final pooled melt is a close, though not exact match for the VHT volcanic glasses. Garnet and ilmenite are residual phases at 40 kb. Gamet melts out in the next increment of melting, but ilmellite persists down to 26 kb. If garnet persisted as well, the instantaneous melts would become too aluminous to produce the VHT compositions. The 40 kb instantaneous melt contains 23 wt% Ti02, whereas the 8 kb melt contains less than 5 %. The 1 atln liquidus boundaries are appropriate for liquids with the Ti02 content of the VHT glasses (15-16 %). Calculated melt densities are plotted in Fig. 2 and contrasted with the density of the source (compressibilities from [2]). At P > 24 kb melts are denser than the source and will sink within the source. Sinlung melts will crystallize to gamet and ilmenite-rich masses and become even denser than the liquids. If these masses of frozen melt sink out of the source, the capacity of the source to generate VHT magmas will diminish, if not disappear. As long as the masses remain witlun the source, they will cycle through episodes of melting (net ascent) and crystallization (net descent) [3]. Because the amount of melting is small, it is possible for tliese masses to remain within the ascending source as long as the masses remain dispersed because settling velocity depends on volume as well as density. Masses remaining within the ascending source when the source crosses the density cross-over at -24 kb will subsequently melt a id form pools of buoyant liquid. These pools will initially have net ascent velocities less than that of the source and will thus forni reservoirs into wlucli fresh increments of melt will mix. Limited removal of some of the ilm-garnet masses prior to the source reaching the density cross-over is a possible way of introducing trace element heterogeneities aid unsupported isotope ratios in intermediate to high-Ti magmas. REFERENCES: (1) Longhi J. (1992) Luriar Plariez. Sci. XXII, 343-353. (2) Agee C.B. and Circone S. (1995) Lunar Planet. Sci. XXVI, 5-6. (3) Hess P.C. and Pannentier E.M. (1994) Lurtar Plattet. Sci. XXV, 541-542." @default.
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• W1645677935 date "1996-03-01" @default.
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• W1645677935 title "Investigation of the Origin of Hi-Ti Basalts by Polybaric Fractional Fusion" @default.
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