The distribution of various forms of metallic iron in a regolith sample from the Mare Crisium was studied as a function of depth of the material in the column and of regolith particle size. The study was conducted on both stratification probes (fractions less than 0.2 mm) and granulometric fractions of base probes without further separation of material. The total metallic iron content was determined from the magnetic susceptibility of the samples and the amount of finely dispersed form of the metallic iron was determined from the intensity of the EPR signal. The metallic iron content was found to decrease with increasing fraction grain size and to obey an exponential law. In several probes there was noted a regular increase in the rate of decrease of both total and finely dispersed metallic iron upon transition from fine to coarser probe fractions with increasing degree of working of the soil. One probe appears to be a mixture of more mature fine-grained and less worked, coarser-grained parts.
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- Chemical Composition;
- Core Tube Samples;
- Lunar and Planetary Exploration; Moon