40th Lunar and Conference (2009) sess501.pdf

Thursday, March 26, 2009 : AQUEOUS PROCESSES 8:30 a.m. Waterway Ballroom 1

Chairs: Rebecca Williams Mary Chapman

8:30 a.m. Williams R. M. E. * Weitz C. M. Stratigraphic Context for Inverted Channels on the North of Juventae : Implications for Post- Climate Change [#1935] Fluvial features in negative and are preserved in a layered section on plains north of . The record of geologic events preserved here suggests that clement climate conditions were episodic in the post-Noachian period.

8:45 a.m. McGowan E. M. * McGill G. E. Putative Water Related Features: Mensae and , Mars [#1295] Analogous spatial relationships between putative shorelines, pitted cones, and giant polygons are found in both Cydonia Mensae and Utopia Planitia.

9:00 a.m. Erkeling G. * Reiss D. Hiesinger H. Jaumann R. Morphologic, Stratigraphic and Morphometric Investigations in Eastern , Mars: Implications for Long-Term Fluvial Activity [#1604] The Noachian highlands of Libya Montes represent one of the oldest regions on Mars that have been degraded by intensive, long-term and repeated fluvial processes which led to the formation of widespread and mature “dendritic networks.”

9:15 a.m. Baker D. M. * Head J. W. Marchant D. R. Flow Patterns of Lobate Debris Aprons and North of Ismeniae Fossae, Mars [#1822] Flow patterns are mapped within lobate debris aprons and lineated valley fill north of Ismeniae Fossae, Mars. Flowlines are sourced in plateau alcoves and form large, well-integrated systems, consistent with a debris-covered glacier interpretation.

9:30 a.m. Howard D. A. * Modeled Catastrophic Outflow at Channel, Mars [#2179] The first hydraulic modeling of Aram Chaos channel is presented indicating that fluvial flow may have created enough stream power to sculpt the channel in a single catastrophic outflow event.

9:45 a.m. Kargel J. S. * Furfaro R. Rodriguez J. A. P. Candelaria P. Prieto-Ballesteros O. Marion G. M. Crowley J. Hook S. No-Rainfall Origin of Valley Networks by Salt Dehydration: Numerical Thermal Model [#2063] Salts in Melas Chasma should produce large positive thermal anomalies and warm hypersaline conditions at shallow depths. Dewatering may yield brine eruptions, and we argue that in Melas Chasma valley networks were produced this way, not by rainfall.

10:00 a.m. Chapman M. G. * G. Dumke A. Michaels G. van Gasselt S. Kneissl T. Zuschneid W. Hauber E. Mangold N. Evidence of Late-Stage Fluvial Outflow in , Mars [#1374] This abstract discusses a highlight of a mapping-based study of the Echus Chasma and system: a fracture in Echus Chasma, identified to have sourced at least one late-stage flood, and possibly other lava and water floods.

40th Lunar and Planetary Science Conference (2009) sess501.pdf

10:15 a.m. Hauber E. * Preusker F. Trauthan F. Reiss D. Carlsson A. E. Hiesinger H. Jaumann R. Johansson H. A. B. Johansson L. Johnsson A. McDaniel S. Olvmo M. Zanetti M. Morphometry of Alluvial Fans in a Polar Desert (Svalbard, Norway): Implications for Interpreting Martian Fans [#1658] We analyze field measurements and high-quality image (20 cm/px) and topographic (50 cm/px) data of alluvial fans in Svalbard, an arcic polar desert, as analogues for martian fans. Remotely-sensed morphometric data alone are insufficient for unambiguous interpretations.

10:30 a.m. Ori G. G. * Di Achille G. Pondrelli M. Deltas on Mars [#1579] Deltaic depositional systems are an important component in the geological history of Mars. Deltaic deposits provide evidence of a complex and vast hydrological system and are the most prominent features suggesting the existence of long-lasting standing bodies of water.

10:45 a.m. Weitz C. M. * Noe Dobrea E. Williams R. M. E. Metz J. Quantin C. Parente M. Grotzinger J. MRO Observations of Fluvial Features, Sulfates, and Other Landforms in the Melas Chasma Basin [#1874] We have used new data acquired from the Mars Reconnaissance Orbiter (MRO), including HiRISE, CTX, and CRISM, to analyze fluvial features, sulfates, and other landforms in the Melas Chasma Basin.

11:00 a.m. Parker T. J. * East Acidalia Shoreline Morphology at MRO CTX Image Scales [#2551] Current work to revisit sites along the lowland/upland boundary where landforms interpreted to be shorelines were identified, using CTX images georeferenced to MOLA topography.

11:15 a.m. Wray J. J. * Milliken R. E. Swayze G. A. Dundas C. M. Bishop J. L. Murchie S. L. Seelos F. P. Squyres S. W. Crater and Other Possible Paleolakes in , Mars [#1896] Diverse, interbedded sulfate and clay minerals are observed in light-toned, layered deposits inside several large degraded craters in the Terra Sirenum region of Mars. These may be lacustrine sediments precipitated under a range of pH conditions.

11:30 a.m. Di Achille G. * Hynek B. M. Searls M. L. New Evidence for the Paleolake, Mars, from the High Resolution Imaging Science Experiment (HiRISE) [#1939] Sub-meter scale High Resolution Imaging Science Experiment (HiRISE) images of Shalbatana Vallis, Mars, reveal the first direct evidence of martian strandlines along a delta formed within an intravalley lake during the (~3.4 Ga).