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Evidence for retrograde lithospheric subduction on VenusAnnular moats and outer rises around large Venus coronas such as Artemis, Latona, and Eithinoha are similar in arcuate planform and topography to the trenches and outer rises of terrestrial subduction zones. On earth, trenches and outer rises are modeled as the flexural response of a thin elastic lithosphere to the bending moment of the subducted slab; this lithospheric flexure model also accounts for the trenches and outer rises outboard of the major coronas on Venus. Accordingly, it is proposed that retrograde lithospheric subduction may be occurring on the margins of the large Venus coronas while compensating back-arc extension is occurring in the expanding coronas interiors. Similar processes may be taking place at other deep arcuate trenches or chasmata on Venus such as those in the Dali-Diana chasmata area of aestern Aphrodite Terra.
Document ID
19920070460
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sandwell, David T.
(Scripps Institution of Oceanography La Jolla, CA, United States)
Schubert, Gerald
(California, University Los Angeles, United States)
Date Acquired
August 15, 2013
Publication Date
August 7, 1992
Publication Information
Publication: Science
Volume: 257
Issue: 5071
ISSN: 0036-8075
Subject Category
Lunar And Planetary Exploration
Accession Number
92A53084
Funding Number(s)
CONTRACT_GRANT: JPL-958950
CONTRACT_GRANT: JPL-958496
Distribution Limits
Public
Copyright
Other

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