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LAVINIA.TXT
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MAGELLAN PROJECT OFFICE
P-37601
2/19/91
This is a Magellan full-resolution radar mosaic of the Lavinia
region of Venus. The mosaic is centered at 50 degrees south
latitude, 345 degrees east longitude, and spans 540 kilometers
(338 miles) north to south and 900 kilometers (563 miles) east to
west. As with all Magellan images acquired thus far, the
illumination of the radar is from the left-hand side of the
image. This area shows a diverse set of geologic features. The
bright area running from the upper right to the lower left is
interpreted as part of a belt of ridges, formed by compression
and thickening of the upper layers of the planet. The areas
between ridges suggest flooding by radar dark (and thus
presumably) smoother lavas. The varied textures of the lavas can
be seen in the mottled appearance of the plains which are cut by
the ridges; brighter, rougher flows are also quite common. The
particularly bright flows in the lower right corner are the
northern extension of Mylitta Fluctus. The bright ridges
adjacent to Mylitta Fluctus at the bottom center of the image
also appear to have been affected by the volcanic activity. Some
of these bright features have been interpreted as down-dropped
areas roughly 5 kilometers (3 miles) wide. This would imply a
region of extension where the crust has been pulled apart and
thus was more easily flooded by the later lava flows. The
thinner fractures running from the upper left seem to end at the
ridge belt in the center of this mosaic. These thinner fractures
are a continuation of a pattern seen throughout much of Lavinia
and suggest a pattern of compression over a very large region.
At the bottom of the image, overlying the ridges, is an impact
crater 10-15 kilometers (6-10 miles) in diameter. The double or
overlapped crater structure and asymmetrical ejecta pattern
suggests that the incoming body broke up shortly before it hit,
leaving closely-spaced craters. The placement of the crater on
top of the ridges implies it is younger than the ridges; in fact,
the crater may be one of the youngest features in this image.
Jet Propulsion Laboratory
California Institute of Technology
National Aeronautics and Space Administration
Pasadena, CA 91109