XPS and SAM studies of the surface chemistry of lunar impact glasses including 12054We report and discuss quantitative X-ray photoemission (XPS) analyses of mm size areas and qualitative scanning Auger microprobe (SAM) analyses of micron size areas on the surfaces of impact glass coatings found on fragments in the 14161 coarse fines and on the top surface, and a reentrant crack surface of rock 12054. The data suggest that some segregation occurs during impact glass formation leading to surface enrichments in Si and depletions in Mg, Al, Ca, and Ti. The magnitude of the effect appears fairly small, although the complexity of the surfaces severely complicates the data analysis. Because of the complexity of the surfaces, both XPS and SAM data were essential. A search for direct evidence of either solar wind sputter erosion or vapor deposition on the exposed top surface of 12054 provided interesting results which we cannot yet fully interpret. Both this surface and the surface from the re-entrant crack showed enrichments of more than a factor of two in Fe with respect to the bulk.
Document ID
19800039467
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Housley, R. M. (Rockwell International Science Center Thousand Oaks, CA, United States)
Grant, R. W. (Rockwell International Science Center Thousand Oaks, CA, United States)
Cirlin, E. H. (Rockwell International Science Center Thousand Oaks, Calif., United States)