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FE-SEM, FIB and TEM Study of Surface Deposits of Apollo 15 Green Glass Volcanic SpherulesSurface deposits on lunar pyroclastic green (Apollo 15) and orange (Apollo 17) glass spherules have been attributed to condensation from the gas clouds that accompanied fire-fountain eruptions. The fire fountains cast molten lava high above the lunar surface and the silicate melt droplets quenched before landing producing the glass beads. Early investigations showed that these deposits are rich in sulfur and zinc. The deposits are extremely fine-grained and thin, so that it was never possible to determine their chemical compositions cleanly by SEM/EDX or electron probe x-ray analysis because most of the excited volume was in the under-lying silicate glass. We are investigating the surface deposits by TEM, using focused ion beam (FIB) microscopy to extract and thin the surface deposits. Here we report on chemical mapping of a FIB section of surface deposits of an Apollo green glass bead 15401using the ultra-high resolution JEOL 2500 STEM located at NASA Johnson Space Center.
Document ID
20110007142
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Ross, Daniel K.
(Jacobs Technology, Inc. Houston, TX, United States)
Thomas-Keprta, K. L.
(Jacobs Technologies Engineering Science Contract Group Houston, TX, United States)
Rahman, Z.
(Jacobs Technology, Inc. Houston, TX, United States)
Wentworth, S. J.
(Wentworth (S. J.) Houston. TX, United States)
McKay, D. S.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 25, 2013
Publication Date
March 7, 2011
Subject Category
Lunar And Planetary Science And Exploration
Report/Patent Number
JSC-CN-22673
Meeting Information
Meeting: 42nd Lunar and Planetary Science Conference
Location: The Woodlands, TX
Country: United States
Start Date: March 7, 2011
End Date: March 11, 2011
Distribution Limits
Public
Copyright
Public Use Permitted.
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