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Abstracts for the Venus Geoscience Tutorial and Venus Geologic Mapping Workshop ABSTRACTS FOR THE VENUS GEOSCIENCE TUTORIAL AND VENUS GEOLOGIC MAPPING WORKSHOP Flagstaff, Arizona June 12-15, 1989 Sponsored by Lunar and Planetary Institute and National Aeronautics and Space Administration No0-[7423 (NASA-CP-1_5_32) A_ST_,ACTb FOR THE VFNUS --TH_U-- GEOSCIENC£ TUTORIAL AND VENUS 6=OLOGI£ N90-t2e_3 m MAPPING WnRKSHOP Abstr_cts _nl'i (Lunqr _nd Unclas Planetary lns_'.) 62 p C£CL 03R o31v1 0218571 ABSTRACTS FOR THE VENUS GEOSCIENCE TUTORIAL AND VENUS GEOLOGIC MAPPING WORKSHOP Flagstaff, Arizona June 12-15, 1989 Sponsored by Lunar and Planetary Institute National Aeronautics and Space Administration Hosted by the U. S. Geological Survey LPI Contribution No. 708 Compiled in 1989 by the Lunar and Planetary Institute 3303 NASA Road 1 Houston, TX 77058-4399 Material in this volume may be copied without restraint for library, abstract service, educational, or personal research purposes; however, republication of any paper or portion thereof requires the written permission of the authors as well as appropriate acknowledgment of this publication. The Lunar and Planetary Institute is operated by the Universities Space Research Association under Contract No. NASW-4066 with the National Aeronautics and Space Administration. Cover: Radar image of Maxwell Montes, Venus. (Courtesy Arecibo Observatory) PREFACE This volume contains abstracts of invited tutorial and solicited posters that have been accepted for presentation at the Venus Geoscience Tutorial and Venus Geologic Mapping Workshop. Conveners: Gerald Schaber and Richard Kozak U. S. Geological Survey, Flagstaff Program Committee: Gerald Schaber, U. S. Geological Survey, Flagstaff James Head, Brown University Roger Phillips, Southern Methodist University Stephen Saunders, Jet Propulsion Laboratory Logistics and administrative support were provided by the Projects Office staff at the Lunar and Planetary Institute. iii CONTENTS P - Poster T - Tutorial T Geology of Southern Guinevere Planitia, Venus, Based on Analyses of Goldstone Radar Data R. E. Arvidson, J. J. Plaut, R. F. Jurgens, R. S. Saunders, and M. A. Slade ............................................................................................................ 1 P Characteristics, Distribution and GeologicTerrain Associations of Small Dome-like Hills on Venus J. C. Aubele and E. N. Slyuta ...................................................................................... 2 P Tessera Terrain: Characteristics and Models of Origin D. L. Bindschadler and J. W. Head ............................................................................ 4 T Divergent Plate Boundaries and Crustal Spreading on Venus: Evidence from Aphrodite Terra L. S. Crumpler and J. W. Head ................................................................................... 6 T Venus Volcanism: Rate Estimates from Laboratory Studies of Sulfur Gas-Solid Reactions K. Ehlers, B. Fegley, Jr., and R. G. Prinn .................................................................. 8 P Potential for Observing and Discriminating Impact Craters and Comparable Volcanic Landforms on Magellan Radar Images J. P. Ford ...................................................................................................................... 10 P Contrasting Landform Perception with Varied Radar Illumination Geometries and at Simulated Resolutions of Venera and Magellan J. P. Ford and R. E. Arvidson ................................................................................... 11 rI" Venus Surface Properties Deduced from Radar and Radiometry P. G. Ford .................................................................................................................... 12 P A Morphologic Study of Venus Ridge Belts S. L. Frank and J. W. Head ....................................................................................... 13 P Evidence for Volcanism bl NW Ishtar Terra, Venus L. Gaddis and R. Greeley .......................................................................................... 15 P Analysis of Radar Images of the Active Volcanic Zone at Krafla, Iceland: The Effects of Look Azimuth Biasing J. B. Garvin and R. S. Williams, Jr ........................................................................... 17 V PRECEDING PAGE BLANK NOT FILMED P Radar Scattering Mechanisms Within the Meteor Crater Ejecta Blanket: Geologic Implications and Relevance to Venus J. B. Garvin, B. A. Campbell, S. H. Zisk, G. G. Schaber, and C. Evans ....................................................................................................................... 19 T Aeolian Processes on Venus R. Greeley .................................................................................................................... 21 T Thoughts on the Venusian Surface and Early Earth R. B. Hargraves ........................................................................................................... 23 T Architecture of Orogenic Belts and Convergent Zones in Western lshtar Terra, Venus J. W. Head, R. Vorder Bruegge, and L. Crumpler ................................................ 24 Deducing the Age of the Dense Venus Atmosphere R. Kahn ........................................................................................................................ 26 Clotho Tessera, Venus: A Fragment of Fottuna Tessera? R. C. Kozak and G. G. Schaber ................................................................................ 27 T Tectonism on Venus: A Review R. Kozak and G. G. Schaber ..................................................................................... 29 T Surface Composition and Petrology J. S. Lewis .................................................................................................................... 30 T Extensional Tectonism in the Southwestern United States I. Lucchitta .................................................................................................................. .31 P Crater Identification and Resolution of Lunar Radar Images H. J. Moore and T. W. Thompson .......................................................................... .32 T Venus: Mantle Convection, Hotspots, and Tectonics R. J. Phillips ................................................................................................................ .33 P Radar Scattering from Desert Terrains, Pisgah/Lavic Region, California: Implications for Magellan J. J. Plaut, R. E. Arvidson, and S. Wall .................................................................... 35 P Lakshmi Planum: A Distinctive Highland Volcanic Province K. M. Roberts and J. W. Head ................................................................................ .37 T Volcanism on Venus: Large Shields and Major Accumulations of Small "Domes" G. G. Schaber and R. C. Kozak ................................................................................ 39 T Impact Cratering and the Surface Age of Venus: The Pre-Magellan Controversy G. G. Schaber, E. M. Shoemaker, C. S. Shoemaker, and R. C. Kozak ................................................................................................................. 41 vi P Geology of the Venus EquatorialRegion from Pioneer Venus Radar Imaging D. A. Senske and J. W. Head .................................................................................... 43 T Venus Gravity: Measurements, Reductions and Results W. L. Sjogren ............................................................................................................... 45 T Venus and the Archean Earth: Thermal Considerations N. H. Sleep ................................................................................................................... 46 P Coronae on Venus: Observations and Models of Origin E. R. Stofan ................................................................................................................. 47 T Crustal Deformation: Earth vs. Venus D. L. Turcotte .............................................................................................................. 49 P Eastern lshtar Terra: Tectonic Evolution Derived from Recognized Features R. W. Vorder Bruegge and J. W. Head ................................................................... 50 P Stress Distribution and Topography of Tellus Regio, Venus D. R. Williams and R. Greeley ................................................................................. 52 Three Ages of Venus C. A. Wood and C. R. Coombs ................................................................................. 54 vii N90-1242"5 t, CHARACTERISTICS,DISTRIBUTIONANDGEOLOGIC/TERRA ASSOCIATIONS OF SMALL DOME-LIKE HILLS ON VENUS J.C. Aube/e, Dept. of Geol. Sciences, Brown University, Providence, R.I. 02912 E.N. Slyuta, Vernadsky Institute, USSR Academy of Sciences, Moscow, U.S.S.R. Introduction. Approximately 22,000 small dome-like hills have been recognized on the northern 20% of the surface of Venus imaged by Venera 15/16. These features have been described [1] as generally circular in planimetric outline, with a range in basal diameter from the effective resolution of the Venera Images (1-2km) up to 20 kin. General Characteristics, The small hills have been called domes [1,2.] following the lunar nomenclature, be- cause of their broad apparent form. The nomenclature used here, "small dome-like hills", Is preferred because of the strict volcanological definition of a dome and terrestrial lithologic connotations. The actual number of these features, and their true range of diameter and modal diameter Is unknown; since there is
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