Preferential sputtering as a method of producing metallic iron, inducing major element fractionation and trace element enrichment

Details Preferential sputtering as a method of producing metallic iron, inducing major element fractionation and trace element enrichment Preferential sputtering as a method of producing metallic iron, inducing major element fractionation and trace element enrichment

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..33..289p&link_type=abstract

Earth and Planetary Science Letters, vol. 33, no. 2, Dec. 1976, p. 289-299. Research supported by the Science Research Council.

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9

Fractionation, Iron, Lunar Soil, Sputtering, Trace Elements, Astronomical Models, Fines, Helium Atoms, Momentum Transfer, Oxygen Atoms, Silicates, Solar Wind, Thermodynamic Properties

Scientific paper

A thermodynamic model is presented indicating that preferential sputtering of oxygen atoms by the solar wind leads to the formation of free iron in lunar samples. Other major elements will be fractionated according to the ratio of their heat of sublimation to the heat of dissociation of the oxide. It is suggested that preferential sputtering may condition the major element fractionations observed for glassy agglutinates. If sufficient exposure time is available, preferential sputtering may be able to produce metallic iron-rich layers about 40 A thick on the surfaces of lunar grains. Preferential sputtering could account for all the free iron in the lunar soil provided reduction takes place predominantly in fine particles with a mean grain size of less than 10 micron diameter which are later incorporated into glassy agglutinates.

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