Tessera Terrain Formation and Evolution on Venus: Evidence for Phase III Epeirogenic Uplift in Ovda Regio

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Highlands:Evolution, Movements: Epeirogenic, Ovda Regio, Tesserae

Scientific paper

Using Magellan altimetry and image data, we define a Phase III of tessera terrain evolution in which a considerable portion of the present elevation of tessera in Central Ovda Regio is obtained, but during which there is little obvious evidence for formation of distributed tectonic deformation features typical of the tessera fabric. We interpret a major part of the Phase III topographic contribution of tessera to be due to post-tessera formation epeirogenic uplift related to isostatic readjustment associated with crustal thickening accompanying tessera formation. Stratigraphic arguments suggest that considerable amounts of uplift followed the emplacement of the regional wrinkle-ridged plains (with a crater retention age of ~300 Ma) but that much of the uplift had occurred by the time that the smooth and lobate plains were emplaced (perhaps 100-200 Ma ago). The major fracture belt local-ized along the southern margin of Ovda Regio appears to be a direct manifestation of this uplift. The broad topographic uplift of Phase III tessera evolution contrasts to the distinctive distributed tectonic structures of Phase I/II.

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