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Tests of crustal divergence models for Aphrodite Terra, VenusThis paper discusses the characteristics of Aphrodite Terra, the highland region of Venus which is considered to be a likely site of mantle upwelling, active volcanism, and extensional tectonics, and examines the relation of these features to three alternative kinematic models for the interaction of mantle convection with the surface. These the 'vertical tectonics' model, in which little horizontal surface displacement results from mantle flow; the 'plate divergence' model, in which shear strain from large horizontal displacements is accommodated only in narrow zones of deformation; and the 'distributed deformation' model, in which strain from large horizontal motions is broadly accommodated. No convincing observational evidence was found to support the rigid-plate divergence, while the evidence of large-scale horizontal motions of Aphrodite argues against purely vertical tectonics. A model is proposed, involving a broad disruption of a thin lithosphere. In such a model, lineaments are considered to be surface manifestations of mantle convective flow.
Document ID
19890067294
Document Type
Reprint (Version printed in journal)
Authors
Grimm, Robert E.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Solomon, Sean C.
(MIT Cambridge, MA, United States)
Date Acquired
August 14, 2013
Publication Date
September 10, 1989
Publication Information
Publication: Journal of Geophysical Research
Volume: 94
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
89A54665
Funding Number(s)
CONTRACT_GRANT: NSG-7297
Distribution Limits
Public
Copyright
Other

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