Subsolidus phase relations in the system Zr-Fe-Ti-O in equilibrium with metallic iron. Implications for lunar petrology

Details Subsolidus phase relations in the system Zr-Fe-Ti-O in equilibrium with metallic iron. Implications for lunar petrology Subsolidus phase relations in the system Zr-Fe-Ti-O in equilibrium with metallic iron. Implications for lunar petrology

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987comp...97..264l&link_type=abstract

Contributions to Mineralogy and Petrology, Volume 97, Issue 2, pp.264-278

Physics

3

Scientific paper

An experimental study of the system Zr-Fe-Ti-O in equilibrium with metallic iron has been conducted at atmospheric pressure and in the temperature range 950 1300° C, with the purpose of modelling sub-solidus relations between Zr-bearing Fe-Ti oxide phases in lunar rocks. The phase relations are governed by the coexistence of the Fe-Ti oxides with ZrO2 at temperatures below 1247° C, but with the new cubic “ZFT” phase at higher temperatures. “ZFT”, approximately Zr Fe Ti O5, is probably related to the so-called “stabilized cubic zirconia” and could represent a synthetic equivalent of some lunar Zr-Fe-Ti rich oxide minerals. The zirconium contents in all Fe-, Ti and Fe-Ti-oxide phases increase with increasing temperature. At each temperature, Zr is incorporated preferentially in the Ti-oxide (up to 11 wt% ZrO2), followed by ferropseudobrookite (up to 6 wt% ZrO2), ilmenite (max. 4 wt%) and wüstite (max. 2.5 wt%). Ulvöspinel coexisting with ilmenite (+Fe0+ ZrO2 and/or “ZFT”) always contains less than 1.2 wt% ZrO2, whereas the same mineral in assemblage with wüstite-ZrO2-Fe0 displays even higher ZrO2 contents than ilmenite (above 4 wt%). Considering that the values determined here in the synthetic parageneses represent saturation concentrations at high temperatures in a simple model system, the ZrO2 concentrations in the corresponding lunar minerals should generally be significantly lower. This is realized, except for the so-called “Cr-Zr-Ca armalcolites” which display ZrO2 contents in the range 3.5 7 wt% and are thus probably related rather to Zr-rich oxide minerals than to armalcolite itself.

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