Iron distributions and metallic-ferrous ratios for Apollo lunar samples: Mössbauer and magnetic analyses.
Abstract
Iron phase distributions and metallic-ferrous ratios are determined for a large number of lunar soil samples by Mossbauer spectroscopy and magnetic measurements. Discrepancies in the ratio values determined by the two techniques are found in some samples containing large amounts of iron in olivine. It is shown that the discrepancies are probably due to a combination of strong antiferromagnetic interactions between Fe(2+) spins in olivine and large grain sizes of metallic iron. The former effect would lead to magnetic ratios that are too high while the latter would result in Mossbauer ratios that are too low. The percentage of iron in olivine is found to decrease substantially with increasing weight per cent of FeO, which may be indicative of higher crystallization temperatures for material from the lunar highlands.
- Publication:
-
Lunar and Planetary Science Conference Proceedings
- Pub Date:
- 1974
- Bibcode:
- 1974LPSC....5.2779H
- Keywords:
-
- Iron;
- Lunar Soil;
- Magnetic Measurement;
- Mineralogy;
- Mossbauer Effect;
- Absorption Spectra;
- Apollo Flights;
- Chemical Analysis;
- Ferromagnetism;
- Lunar Surface;
- Magnetic Effects;
- Olivine;
- Petrology;
- Phase Velocity;
- Lunar and Planetary Exploration