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Science 11 January 1991:
Vol. 251. no. 4990, pp. 180 - 183
DOI: 10.1126/science.251.4990.180
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Articles

Venus Southern Hemisphere: Geologic Character and Age of Terrains in the Themis-Alpha-Lada Region

D. B. CAMPBELL 1, D. A. SENSKE 2, J. W. HEAD 2, A. A. HINE 3, and P. C. FISHER 2

1 National Astronomy and Ionosphere Center, Cornell University, Ithaca, NY 14853
2 Department of Geological Sciences, Brown University, Providence, RI 02912
3 National Astronomy and Ionosphere Center, Arecibo Observatory, Arecibo, Puerto Rico 00612

Arecibo high-resolution radar images of the southern hemisphere of Venus extending to 78°S show that the surface of the Themis-Alpha-Lada region is characterized by linear deformation zones with volcanoes and corona-like features and by regional volcanic deposits (primarily plains, small shields, and large edifices). Large-scale areal deformation is limited to the tessera of Alpha Regio. Lada Terra, in the southern high latitudes, contains several large coronae, in contrast to Ishtar Terra in the northern high latitudes. The density of craters of possible impact origin is somewhat lower than that observed in the Venera 15 and 16 coverage; these data extend to 43 percent of the areas of the surface of Venus with ages of less than about 1 billion years.

Submitted on August 6, 1990
Accepted on October 23, 1990


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Fundamental Issues in the Geology and Geophysics of Venus.
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Venus Tectonics: Initial Analysis from Magellan.
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