Apollo 14 very low titanium glasses - Melting experiments in iron-platinum alloy capsules

Details Apollo 14 very low titanium glasses - Melting experiments in iron-platinum alloy capsules Apollo 14 very low titanium glasses - Melting experiments in iron-platinum alloy capsules

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lpsc...14..335c&link_type=abstract

(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge

Physics

3

Iron Alloys, Melts (Crystal Growth), Metallic Glasses, Platinum Alloys, Pressure Vessels, Spaceborne Experiments, Apollo 14 Flight, Cosmochemistry, High Pressure, Liquidus, Lunar Composition, Production Engineering, Space Commercialization, Titanium, Valence, Moon, Apollo 14, Glasses, Melting, Alloys, Iron, Platinum, Technique, Laboratory Studies, Saturation, Pressure, Distribution, Experiments, Liquid Phase, Microprobe Methods, Depth, Analogs

Scientific paper

This paper describes two techniques that have been developed to produce Fe-Pt alloy capsules for hgh-pressure experiments, and reports liquidus-phase relations of the Apollo 14 very low titanium glasses determined using Fe-rich capsules (a/Fe/ approximately 0.6). The liquid is multiply saturated with olivine and clinopyroxene at equal to or greater than 22 kbar. The multiple saturation is at least 3 kbar higher than that determined using pure Fe capsules and corresponds to a source region at least 60 km deeper if olivine and clinopyroxene were the residual phases. However, independent data on iron activity or oxygen fugacity of the glasses are still needed in order to choose a container of optimum composition. Preliminary experiments in Fe-poor alloy capsules suggest that the valence state of iron and the crystallization sequence in the melt have changed, possibly as a result of oxidizing materials entrapped during the iron-plating processes. The FeO content of the charge decreases linearly with increasing run duration in experiments using pure Fe capsules. The observation that iron-rich globules grow with time suggests that the equilibrium Fe (bleb) + Fe2O3 (liq) = 3 FeO (liq) might be established in the liquid at high pressure. If this explanation is correct, an appreciable amount of 'FeO' in the liquid could actually be Fe2O3, and some natural lunar volcanic glasses may contain ferric iron as well.

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