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- W2018076840 abstract "We have analyzed the morphology, dimensions, radar backscatter, topography, sources, and tectonic settings of lava flow fields and assemblages of fields on Venus with total areas greater than 50,000 km2, and, we term these great flow fields. Great flow fields are typically several hundred thousand square kilometers in extent, with lengths of several hundred kilometers and estimated volumes of 103 to 104 km3. We identify five morphological types of flow field and draw a basic distinction between sheet-like and digitate morphologies. The sheet flow fields represent single massive eruptions from laterally extensive stretches of fissure onto near-horizontal terrain, while the digitate flows were formed by repeated eruptions. We divide digitate fields into aprons, fans, and subparallel types, and identify fields transitional between sheet and digitate morphologies. An analysis of the backscatter coefficient of flow units within several of the great flow fields compared to AIRSAR data of terrestrial lava flows suggests that most units have the surface roughness of smooth pavements to pahoehoe. However, many channel-fed flow units with higher backscatter in the digitate fields have a surface roughness comparable to terrestrial aa. The great flow fields may have been erupted with effusion rates of between 105 and 106 m3 sec-1. Most of the great flows were erupted from sources within zones of lithospheric extension and thinning. Although the set of great flows are younger than the background plains, large regions of plains may have been resurfaced by sheet-type great flow fields which are no longer visible due to homogenization of surface properties. In terms of their dimensions, estimated eruption rates, possible surface textures, and tectonic settings, we consider the great flow fields to be Venusian analogues of terrestrial flood basalt provinces." @default.
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- W2018076840 date "1995-11-01" @default.
- W2018076840 modified "2023-10-01" @default.
- W2018076840 title "Great Lava Flow Fields on Venus" @default.
- W2018076840 doi "https://doi.org/10.1006/icar.1995.1178" @default.
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