Cleopatra Patera on Venus - Venera 15/16 evidence for a volcanic origin

Details Cleopatra Patera on Venus - Venera 15/16 evidence for a volcanic origin Cleopatra Patera on Venus - Venera 15/16 evidence for a volcanic origin

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14...41s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, Jan. 1987, p. 41-44. USGS-supported research.

Physics

14

Calderas, Craters, Venera Satellites, Venus Surface, Volcanoes, Deposits, Radar Imagery, Tectonics, Venus, Cleopatra Patera, Venera 15, Venera 16, Formation, Origin, Volcanism, Shape, Depth, Morphology, Nested Craters, Comparisons, Surface, Features, Deposits, Spacecraft Observations, Radar Methods, Symmetry, Eruptions, Plains, Analysis, Crater Rims, Photographs, Maps, Diagrams, Topography, Crater Floors, Tectonics

Scientific paper

The nonconcentric nature, anomalous depth, and terraced morphology of the nested craters that compose Cleopatra Patera are more closely analogous to volcanic craters (calderas) than multiring impact structures. Associated deposits northeast and downslope of the Patera first recognized on Venera 15/16 radar images are interpreted as volcanic plains related to, and perhaps cogenetic with, Cleopatra. The plains lavas probably originated as effusions from a radial rift zone or ring fissures. Rim deposits surrounding Cleopatra are asymmetric along the structural fabric of the region, also indicating fissure-type eruptions. Finally, a volcanic origin not only is easily reconciled with the tectonic setting of the Patera, it is almost required by the correlation between the Patera and regional structural trend.

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