Lunar and Planetary Science XXXII (2001) sess22.pdf Tuesday, March 13, 2001 POSTER SESSION I 7:00–9:30 p.m. UHCL Mars Volcanism Rogers D. Christensen P. R. Bandfield J. L. Mars’ Volcanic Surface Compositions: Distributions and Boundaries Examined Using Multiple Orbiter Datasets [#2010] MGS TES data is used at high resolution to map small regions of basalt in Mars’ northern hemisphere. With the exception of 2 outliers, the northern extent of the highland basalt appears to correspond with the northern edge of the cratered highlands. Grier J. Bottke W. Hartmann W. K. Berman D. C. Mars: Chronological Studies of the Large Volcanoes in Tharsis [#1823] We are beginning a study of age and morphology relations among Tharsis volcanics, with crater counts using new age calibrations. On Olympus Mons, averages over large areas give characteristic ages of a few hundred My, but youngest flows have ages in range 5–50 My. Kallianpur K. Mouginis-Mark P. J. Slopes of Martian Volcanoes [#1258] We use MOLA data to derive slope maps of 9 volcanoes on Mars. Tharsis volcanoes have the same shape as Galapagos volcanoes with deep calderas. Alba Patera is very similar to Tyrrhena Patera. Slopes greater than 7 degrees are common on Elysium Mons. van der Kolk D. A. Tribbett K. L. Grosfils E. B. Sakimoto S. E. H. Mendelson C. V. Bleacher J. E. Orcus Patera, Mars: Impact Crater or Volcanic Caldera? [#1085] A re-evaluation of volcanic versus impact origins for Orcus Patera, Mars using new Mars Global Surveyor images and topography. Hiesinger H. Head J. W. III Morphologic and Topographic Characterization of Syrtis Major, Mars with MOLA Data [#1868] We make use of high-resolution Mars Orbiter Laser Altimeter (MOLA) and MGS data in order to characterize the topography and morphology of the Syrtis Major volcanic complex and to investigate its origin and geologic evolution. Farrand W. H. Gaddis L. R. Blundell S. Possible Hydrovolcanic Landforms Observed in MOC NA Imagery: A Preliminary Survey [#1664] In a preliminary survey of MOC NA imagery, a number of features resembling table mountains, tuff rings, and maar craters have been identified. Their locations and geologic significance will be discussed. Ghatan G. J. Head J. W. III Candidate Subglacial Volcanoes in the South Polar Region of Mars [#1039] MOLA data support the classification of several features in the south polar region of Mars as volcanoes, and suggest a possible sub-glacial origin for these volcanoes. Grosfils E. B. Sakimoto S. E. H. Topographic Constraints on Magma Reservoir Volume and Depth for Small Near-Polar Volcanoes in the Northern Plains of Mars [#1111] Shallow, edifice-centered depressions may form when subsurface magma melts ground ice. Here, assuming variable porosities, we use MOLA data and thermal calculations to explore the minimum sill volume, thickness and depth required to produce the observed depressions. Lunar and Planetary Science XXXII (2001) sess22.pdf Wong M. P. Sakimoto S. E. H. Garvin J. B. MOLA Topography of Small Volcanoes in Tempe Terra and Ceraunius Fossae, Mars: Implications for Eruptive Styles [#1563] We use MOLA data to measure small volcanoes in the Tempe Terra and Ceraunius Fossae regions of Mars. We find that previous geometry estimates based on imagery alone are inaccurate, but MOLA data support image- based interpretations of eruptive style. Therkelsen J. P. Santiago S. S. Grosfils E. B. Sakimoto S. E. H. Mendelson C. V. Bleacher J. Eruption Constraints for a Young Channelized Lava Flow, Marte Vallis, Mars [#1112] This study constrains flow rates for a specific channelized lava flow in Marte Vallis, Mars. We measured slope- gradient, channel width, and channel depth. Our results are similar to other recent studies which suggests similarities to long, terrestrial basaltic flow. Riedel S. J. Sakimoto S. E. H. Bradley B. A. DeWet A. Lava Tube Flow Models at Alba Patera, Mars: Topographic Constraints on Eruption Rates [#1954] Alba Patera has some of the longest lava tubes over some of the shallowest slopes on Mars. We use MOLA topography to model eruption rates for several Alba Patera lava tubes and compare them within Alba and with flows from other martian volcanic regions. Meyer B. R. Gregg T. K. P. Inferring Lava Flow-Field Emplacement Using MOLA: Topography of Tyrrhena Patera’s Flow Field [#1849] Using MOLA data to obtain accurate measurements of lava flow lobes within the Tyrrhena Patera flow field, we are able to constrain eruption and emplacement parameters. Peitersen M. N. Foote M. Humphries R. MacInnis C. Mazie I. Trump D. Zimbelman J. R. Geomorphometric Analysis of an Ascraeus Mons Lava Flow: Implications for MGS Image Interpretation [#1472] We present here the results of an undergraduate project, to study the morphology of an Ascraeus Mons lava flow. 44 widths and 11 thicknesses (from shadow measurements) were measured off a MOC image. Geomorphometric analyses and Newtonian flow modeling were then applied. Warner N. H. Gregg T. K. P. Bulmer M. H. Textured Lava Flows on Earth, Mars, and Venus [#1693] Textured lava flows at Sabancaya volcano, Peru reveal morphologies similar to textured lava flows on Mars and Venus. Analysis of the flows at Sabancaya may provide an understanding of the rheological properties of the extraterrestrial flows. Lanz J. K. Jaumann R. Possible Volcanic Constructs in Aram Chaos Revealed by MOC and Their Impact on Outflow Channel Genesis [#1574] MOC-Images of Aram Chaos show features resembling volcanic constructs or magmatic intrusions, hinting to the possibility that volcanic activity in the chaotic terrains themself has played a key role in triggering the events that formed the Chryse outflow channels. Head J. W. III Kreslavsky M. A. Plains in Eastern Elysium Planitia, Mars: Topographic Evidence for Aqueous Channels and Lava Flows [#1002] The extremely flat and smooth Amazonian-age plains in eastern Elysium Planitia consist of an older unit (dendritic system of channels) and a younger unit (lava flows filling an outflow channel). Head J. W. III Kreslavsky M. A. Pratt S. Fuller E. R. Amazonis Planitia: Detection of Pre-Aureole Olympus Mons Flows and the Origin of the Smoothest Plains on Mars [#1089] Analysis of Amazonis Planitia shows subdivisions in very smooth terrain and reveals evidence for Early Olympus Mons flows and fluvial and lava deposits..