Mathematics – Logic
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icar..139...55g&link_type=abstract
Icarus, Volume 139, Issue Icarus, pp. 55-66.
Mathematics
Logic
66
Scientific paper
Studies of Venus using Magellan data have so far generated two views about the way Venus has evolved. On the one hand, Venus has been suggested to have had a history in which there was a series of epochs, each represented by a different volcanic or tectonic process on a global scale (Basilevsky and Head 1995; J. W. Head et al. 1996, Lunar Planet Sci. 27th, 525-526; P. T. Basilevsky et al. 1997, In Venus II, Univ. of Arizona Press, Tucson). This we define as a directional history. On the other hand, there is evidence to suggest that coronae, rifts, wrinkle ridges, small and large edifices, and large flow fields have each formed throughout the portion of Venus' history revealed by presently exposed rock units. We propose that the plains have been built up by lavas erupted in a number of different styles, each occurring throughout the history represented by the exposed stratigraphy of the planet. Dates derived from crater counts accumulated from the combined area of specific types of feature such as coronae (e.g., M. H. Price et al. 1996, J. Geophys. Res. 101, 4657-4672) must be interpreted with care as the method is based upon the assumption that features of like morphology have the same age. Detailed studies from full resolution Magellan data indicate that Venus has had a complex history in which most geologic processes have operated in a nondirectional fashion to a greater or lesser extent throughout the planet's history.
Guest John E.
Stofan Ellen R.
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