Other
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgre..107.5116l&link_type=abstract
Journal of Geophysical Research (Planets), Volume 107, Issue E11, pp. 26-1, CiteID 5116, DOI 10.1029/2001JE001533
Other
Planetology: Solar System Objects: Venus, Planetary Sciences: Volcanism (8450), Planetary Sciences: Tectonics (8149)
Scientific paper
Coronae are large volcanotectonic features formed in response to plume/diapir activity that have played an important role in the geodynamical evolution of Venus. Coronae are classified in terms of their morphology; one of the types is the so-called multiple coronae. Models that account for multiple coronae formation include the following: emplacement of several diapirs, the movement of the lithosphere over a stationary plume, and migration of a plume under a stationary lithosphere. This work presents the study of a multiple corona located in the Helen Planitia Quadrangle (V52) (Oanuava Corona) and another corona (unnamed) formed in the vicinity of Oanuava in order to test the viability of these models. Detailed structural mapping shows a migration of magmatic activity along the structure during corona formation and the development of a set of fractures in response to a local stress field. The latter is used as a time marker for the evolution of Oanuava and the unnamed coronae. We propose that this migration could be explained as the result of a sublithospheric lateral flow and ponding of a mantle plume or diapir into a zone of uplifted and thinned lithosphere (plume channeling) induced by the interaction of both coronae.
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