Corona Associations and Their Implications for Venus

Details Corona Associations and Their Implications for Venus Corona Associations and Their Implications for Venus

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998icar..132..344c&link_type=abstract

Icarus, Volume 132, Issue 2, pp. 344-361.

Mathematics

Logic

10

Scientific paper

Geologic mapping principles were applied to determine genetic relations between coronae and surrounding geomorphologic features within two study areas in order to better understand venusian coronae. The study areas contain coronae in a cluster versus a contrasting chain and are (1) directly west of Phoebe Regio (quadrangle V-40; centered at latitude 15 degS, longitude 250 deg) and (2) west of Asteria and Beta Regiones (between latitude 23 degN, longitude 239 deg and latitude 43 degN, longitude 275 deg). Results of this research indicate two groups of coronae on Venus: (1) those that are older and nearly coeval with regional plains, and occur globally; and (2) those that are younger and occur between Beta, Atla, and Themis Regiones or along extensional rifts elsewhere, sometimes showing systematic age progressions. Mapping relations and Earth analogs suggest that older plains coronae may be related to a near-global resurfacing event perhaps initiated by a mantle superplume or plumes. Younger coronae of this study that show age progression may be related to (1) a tectonic junction of connecting rifts resulting from local mantle upwelling and spread of a quasi-stationary hotspot plume, and (2) localized spread of post-plains volcanism. We postulate that on Venus most of the young, post-resurfacing coronal plumes may be concentrated within an area defined by the bounds of Beta, Atla, and Themis Regiones.

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