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Geology and tectonics of the Themis Regio-Lavinia Planitia-Alpha Regio-Lada Terra area, Venus - Results from Arecibo image dataResults of new radar images obtained from the Arecibo Observatory for portions of the southern hemisphere of Venus are reported. The images show that the upland of Phoebe Region contains the southern extension of Devana Chasma, a rift zone extending 4200 km south from Theia Mons and interpreted as a zone of extension. Alpha Regio, the only large region of tesserae within the imaged area, is found to be similar to tesserae mapped elsewhere on the planet; it covers a smaller percentage of the surface than that observed in the northern high latitudes. Themis Region is mapped as an ovoid chain of radar-bright arcuate single- and double-ring structures, edifices, and bright lineaments. On the basis of the present analysis, the southern hemisphere of Venus is interpreted to be characterized by regions of mantle upwelling on a variety of scales, upwelling and extension, and localized compression.
Document ID
19920039497
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Senske, D. A.
(Brown Univ. Providence, RI, United States)
Head, J. W.
(Brown Univ. Providence, RI, United States)
Fisher, C. P.
(Brown Univ. Providence, RI, United States)
Decharon, A.
(Brown Univ. Providence, RI, United States)
Frank, S. L.
(Brown Univ. Providence, RI, United States)
Keddie, S. T.
(Brown Univ. Providence, RI, United States)
Roberts, K. M.
(Brown University Providence, RI, United States)
Campbell, D. B.
(Cornell University Ithaca, NY, United States)
Hine, A. A.
(Arecibo Observatory PR, United States)
Stofan, E. R.
(JPL Pasadena, CA, United States)
Date Acquired
August 15, 2013
Publication Date
November 1, 1991
Publication Information
Publication: Earth, Moon, and Planets
Volume: 55
ISSN: 0167-9295
Subject Category
Lunar And Planetary Exploration
Accession Number
92A22121
Funding Number(s)
CONTRACT_GRANT: NGT-50147
CONTRACT_GRANT: NAGW-2185
Distribution Limits
Public
Copyright
Other

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