May 29, 2005
A Shallow Sea of Lava
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Image Credit: Howard Eskildsen |
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A Shallow Sea of Lava Mare Fecunditatis lavas are assumed to fill an impact basin because that is the case for nearly every other roughly circular pile of lava on the Moon. But there is little evidence for the basin, except some curved ridges that might represent an inner ring. Based on the extent of the mare, the Fecunditatis Basin is about 690 km wide. Probably most of the time Fecunditatis is observed the target is the bizarre ricochet craters Messier and Messier A. And often observers are attracted to Langrenus at the top right, and less frequently to Taruntius (bottom left) or the Goclenius rilles (bottom right). Clementine images in various wavelengths have allowed researchers to assemble mosaics whose colors represent chemical compositions of the soils of Fecunditatis. The majority of the Mare is low-Titanium basalts, but there are smaller amounts of higher Titanium basalts that are the youngest flows. Luna 16 landed west of Webb and the returned samples have ages of about 3.3 b.y. The thickness of the Fecunditatis lavas was estimated from the spectral colors of impact crater ejecta. Craters that excavated into the underlying highlands have a distinctive color. And because the depths of craters can be estimated from their diameters, it is easy to estimate how deep the lavas are. In general, Mare Fecunditatis lavas are thin, about 200 m thick, with the greatest depths being 400-500 m. Technical Details: Related Links: Yesterday's LPOD: Down the Rille Tomorrow's LPOD: Hundreds of Domes |
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