USGS

Lunar Pyroclastic Volcanism Project

Lisa R. Gaddis, U.S. Geological Survey, Flagstaff, AZ

FIGURES
 

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Earth-based spectra (after Hawke et al., 1989) for several small  lunar pyroclastic deposits.  The spectra have had straight-line continua removed to facilitate comparison of the band depths at 1.0-micron.  Group 1 deposits include those of Atlas, Grimaldi, and Franklin, Group 2 deposits include those of Eastern Mare Frigoris, and Group 3 deposits include those of J. Herchel.



 
 
 

Map showing the distribution of all known lunar pyroclastic deposits (both large and small).  102 deposits are plotted.  The image base is the Clementine albedo (750-nm) global mosaic, in Simple Cylindrical projection centered at 0,0.  Most pyroclastic deposits are observed near the margins of the major mare-filled lunar basins, but many are also associated with old, floor-fractured craters in the highlands on both the near and far side.  Even though volcanism on the Moon is much less common on the far side, several small pyroclastic deposits are observed there.

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Contact:  Lisa R. Gaddis, lgaddis@flagmail.wr.usgs.gov
Updated:  5/21/99