Mathematics – Logic
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995avest..29..195b&link_type=abstract
Astronomicheskii Vestnik, Tom 29, No. 3, p. 195 - 218
Mathematics
Logic
1
Venus: History, Venus: Geology, Venus: Surface Structure
Scientific paper
Photogeological analysis of the Magellan images of thirty-six sites 1000×1000 km in size and seven larger areas made it possible to distinguish and ascribe the sequence of stratigraphic units and modifying tectonic structures as being the object of geological mapping. The following stratigraphic units were distinguished (from older to younger): 1 - Fortuna group, represented by tessera material; 2 - Sigrun group is represented by densely fractured terrains associated with coronae and plains; 3 - Lavinia group: fractured and ridged plains and ridge belts; 4 - Rusalka group: material of plains with wrinkle ridges; 5 - Atla group: smooth and lobate plains; and 6 - Aurelia group: craters with associated sheets of detrital material having parabolic contours. The observations are in agreement with the scenario during the last 300 - 500 Ma of the geolocial history of Venus, the latter being rather available for interpretation, started with a short period of intense tectonic and volcanic activity resulting in the formation of tesserae and the majority of plains. This was followed by a long period of low but, in a planetary scale, permanent endogenic activity, when the smooth and lobate plains were formed. Furthermore, these plains and previously formed structures were disrupted by extensive rift zones.
Basilevskij A. T.
Head James W.
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