Tessera terrain, Venus - Characterization and models for origin and evolution

Details Tessera terrain, Venus - Characterization and models for origin and evolution Tessera terrain, Venus - Characterization and models for origin and evolution

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.5889b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, April 10, 1991, p. 5889-5907. Research supported by William Marlar Fo

Physics

69

Planetary Evolution, Planetary Mapping, Radar Imagery, Tectonics, Terrain, Venus Surface, Planetary Crusts, Ridges, Surface Roughness, Topography, Venera Satellites, Venus, Terrain, Models, Origin, Formation, Evolution, Surface, Features, Tesserae, Characteristics, Description, Venera 15 Mission, Spacecraft Observations, Venera 16 Mission, Orbiters, Ishtar Terra, Aphrodite Terra, Topography, Roughness, Tectonics, Compensation, Crust, Thickness, Structure, Patterns, Ridges, Comparisons, Deformation, Gravity

Scientific paper

Tessera terrain is the dominant tectonic landform in the northern high latitudes of Venus mapped by the Venera 15 and 16 orbiters and is concentrated in the region between the mountain ranges of western Ishtar Terra and Aphrodite Terra. Tesserae are characterized by regionally high topography, a high-degree of small scale surface roughness, and sets of intersecting tectonic features. Available Pioneer Venus line of sight gravity data suggest that tessera terain is compensated at shallow depths relative to many topographic highs on Venus and may be supported by crustal thickness variations. Three types of tessera terrain can be defined on the basis of structural patterns: subparallel ridged terrain (Tsr), trough and ridge terrain (Ttr), and disrupted terrain (Tds). Observed characteristics of tessera terrain are compared to predictions of formational and modificational models in order to begin to address the question of its origin and evolution. It is found that horizontal convergence and late stage gravitational relaxation are basic observations for subparallel ridged terrain and disrupted terrain.

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