Styles of deformation in Ishtar Terra and their implications

W. M. Kaula, D. L. Bindschadler, R. E. Grimm, V. L. Hansen, K. M. Roberts, S. E. Smrekar

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Abstract

Ishtar Terra, the highest region on Venus, appears to have characteristics of both plume uplifts and convergent belts. Magellan imagery over longitudes 330°-30°E indicates a great variety of tectonic and volcanic activity, with large variations within distances of only a few 100 km. Ishtar appears to be the consequence of a history of several 100 m.y., in which there have been marked changes in kinematic patterns and in which activity at any stage has been strongly influenced by the past. Ishtar Terra does not appear to be the result of a compression conveyed by an Earthlike lithosphere. But there is still doubt as to whether Ishtar is predominantly the consequence of a mantle upflow or downflow. Upflow is favored by the extensive volcanic plain of Lakshmi and the high geoid: topography ratio; downflow is favored by the intense deformation of the mountain belts and the absence of major rifts. -from Authors

Original languageEnglish (US)
Pages (from-to)16,085-16,120
JournalJournal of Geophysical Research
Volume97
Issue numberE10
DOIs
StatePublished - 1992

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