Global geological history of Venus over the past 300 - 500 M.y. as revealed by Magellan radar images.

Details Global geological history of Venus over the past 300 - 500 M.y. as revealed by Magellan radar images. Global geological history of Venus over the past 300 - 500 M.y. as revealed by Magellan radar images.

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sosyr..29..169b&link_type=abstract

Solar System Research, Vol. 29, No. 3, p. 169 - 188

Physics

Venus: History, Venus: Surface Structure

Scientific paper

Photoanalysis 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. The following stratigraphic units were distinguished (from older to younger): Fortuna Group, represented by tessera material; Sigrun group, represented by densely fractured terrains associated with coronae and plains; Lavinia group: fractured and ridged plains and ridge belts; Rusalka group: material of plains with wrinkle ridges; Atla group: smooth and lobate plains; and Aurelia group: craters with associated sheets of detrital material having parabolic contours. The observations are in agreement with the scenario where the last 300 - 500 Myr of Venus history, the latter being rather subject to 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, on 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.

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