Quantitative optical and electron-probe studies of the opaque phases

P. R. Simpson, S. H.u. Bowie

Ilmenite, chrome-titanium spinel, ulvöspinel, troilite, native iron, iron-nickel alloy, and native copper are present. In addition mackinawite is provisionally identified. Three additional opaque phases are present but not identified. Modal analysis indicates that the breccia is enriched in iron relative to ilmenite and troilite, and the high nickel content of this iron suggests that it is largely of meteoritic origin. The bulk composition of liquids corresponding to iron/ troilite droplets in the rocks indicates an oxygen fugacity no greater than 10-15.5 and a sulfur fugacity of 10-6 bar. Complete melting of rocks produced a glass containing complex iron/ troilite globules and skeletal ilmenites.

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Materials
Curve 1
Temperature K: ~298 Wavelength Range, µm: 0.400-0.700 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Sample 85.4.16 from Apollo 11 mission; ilmenite crystal on the edge of rock fragment; appears that a nearly shock metamorphism affected this part also; measured in air; data extracted from smooth curve.
Curve 2
Temperature K: 295.7 Wavelength Range, µm: 0.400-0.700 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: The above specimen and conditions except measured in Cargille type A immersion oil.
Curve 3
Temperature K: ~298 Wavelength Range, µm: 0.400-0.700 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Sample 45.35.5 from Apollo 11 mission; ilmenite; measured in air; data extracted from smooth curve.
Curve 4
Temperature K: 295.7 Wavelength Range, µm: 0.400-0.700 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: The above specimen and conditions except measured in Cargille type A immersion oil.