Mathematics – Logic
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..641i&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 641.
Mathematics
Logic
Stratigraphy, Constraints, Venus Surface, Planetary Mapping, Tectonics, Terrain, Morphology
Scientific paper
Tessera is a geologic unit, the surface of which is heavily deformed by tectonics. The geological mapping of many areas on Venus has shown that the tessera with its characteristic tectonic pattern (normal tessera) always makes up the base of the local and regional stratigraphic columns even though there are several different styles of tectonic activity. Such a stratigraphic position gives the possibility to date the tectonic episode of tessera formation as occurring at the beginning of the visible geologic history of Venus. We have conducted detailed geologic mapping in a zone from 0 to 360 E, 22.3-37.6 N. The mapping showed that there are terrain types the tectonic pattern of which satisfies the formal definition of tessera but is simpler and morphologically close to the pattern of younger and less deformed units. This quasitessera or tessera-like terrain may both represent facies of the normal tessera and illustrate stages of tessera formation.
Head James W.
Ivanov Michael A.
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