Mathematics – Logic
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.1025e&link_type=abstract
(International Union of Geological Sciences, Australian Academy of Sciences, Australian National University, et al., S. R. Taylo
Mathematics
Logic
6
Fractionation, Lunar Composition, Lunar Soil, Magnesium Isotopes, Selenology, Calcium Isotopes, Oxygen Isotopes, Potassium Isotopes, Silicon Isotopes, Sulfur Isotopes
Scientific paper
Oxygen and silicon extracted by partial fluorination from lunar soils show large, percent-level, mass-dependent enrichments in heavy isotopes. Similar isotope fractionations occur in sulphur in grain size separates and possibly in potassium in bulk soils. In contrast, calcium, extracted using similar methods, exhibits only marginal isotope effects. In this work, magnesium was measured in water and acid leaches and in surface layers of individual soil grains, and no large isotope fractionation in magnesium was found. There is a small 0.9-1.7 percent per mass unit effect in one soil sample. The magnesium data are in agreement with the calcium data within errors and in sharp contrast to the large effects in Q, Si, S, and K. The results for calcium and magnesium place severe constraints on any theory attempting to account for the large mass fractionation effects in Q, Si, S, and K in lunar soils. It is proposed that the large effects in oxygen and silicon are probably artifacts of analytical procedures.
Esat Tezer M.
Taylor Stuart R.
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