Chemical Zoning of the Surface Layers in Luna-16 Soil Sample 1635: High Enrichment of Carbon

Details Chemical Zoning of the Surface Layers in Luna-16 Soil Sample 1635: High Enrichment of Carbon Chemical Zoning of the Surface Layers in Luna-16 Soil Sample 1635: High Enrichment of Carbon

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..313d&link_type=abstract

Lunar and Planetary Science, volume 27, page 313

Computer Science

1

Carbon: Enrichment, Components: Volatile, Condensation, Regoliths: Lunar, Zoning: Chemical

Scientific paper

The fine fraction (<74 micrometers) of a Luna-16 soil sample was examined by X-ray photo-electron spectroscopy (XPS) in connection with Ar-etching. We found that the surface layers show three chemically distinct zones. The middle zone, about 2500-3000 angstroms below the surface, is the most interesting. It contains up to 60% carbon, and in addition noticeable amounts of Zn (up to 4%). The remaining elements of this zone show a silicate composition. It is probable that this chemical zoning in the fine regolith particles is connected with a condensation process, and that the impact of a carbon-rich projectile was responsible for the carbon-enriched layer. The projectile could be a carbonaceous chondrite or, more likely, a comet.

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