Patina on Apollo 17 Breccia 76015: SEM Petrography and Mossbauer Spectrometry

Details Patina on Apollo 17 Breccia 76015: SEM Petrography and Mossbauer Spectrometry Patina on Apollo 17 Breccia 76015: SEM Petrography and Mossbauer Spectrometry

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1423w&link_type=abstract

Lunar and Planetary Science, volume 27, page 1423

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Microcraters, Mossbauer, Pancakes: Glass, Patina, Weathering: Space

Scientific paper

A number of rocks in the lunar sample collection have surface patinas which formed as a result of exposure to the space weathering environment on the surface of the moon. It is important to understand patinas and their relationships to the rocks on which they formed because it is likely that patinas on surface- exposed rocks on the moon and other planetary bodies would affect data obtained by either remote sensing or unmanned landers. We have undertaken a multidisciplinary study of patinas on selected Apollo samples using a wide range of techniques including scanning electron microscopy (SEM), backscattered electron imaging (BEI), energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), backscatter Mossbauer spectrometry (BaMS), spectral reflectance spectroscopy, ferromagnetic resonance (FMR) analysis, and wavelength dispersive spectrometry (WDS). SEM/EDX results for patina on high-Ti mare basalt 75075 were reported by McKay et al in LPSC XXVI. Our current focus is on the patina on crystalline matrix breccia 76015. Our initial results show that the 76015 patina is very complex with characteristics that vary widely over a short distance. The 76015 patina is a good example of classic patina with typical lunar surface exposure features such as microcraters and glass pancakes, and is defined here as accretionary microcratered pancake-bearing (AMP) patina.

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