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A reexamination of the spreading center hypothesis for Ovda and Thetis regiones, VenusCrumpler et al. (1987) proposed that Ovda and Thetis Regiones are spreading centers. The strong positive correlation between geoid and topography observed in ovda and Thetis is unlike that observed for terrestrial spreading centers. The maximum elevation expected for spreading centers on Venus is 1.5 km, and a cooling plate thermal model predicts a maximum geoid anomaly of 8 m, both much less than observed. Even if a spreading center is operative in Ovda and Thetis, most of the geoid and topography must be due to other mechanisms. Crumplet et al. also proposed the existence of 'cross-strike discontinuities', interpreted as transform fault zones, but the evidence for these structures is not conclusive.
Document ID
19900058760
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kiefer, Walter S.
(NASA Goddard Space Flight Center Greenbelt, MD; California Institute of Technology, Pasadena, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1990
Publication Information
Publication: Geophysical Research Letters
Volume: 17
ISSN: 0094-8276
Subject Category
Lunar And Planetary Exploration
Accession Number
90A45815
Funding Number(s)
CONTRACT_GRANT: NAGW-1445
Distribution Limits
Public
Copyright
Other

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