Monday, March 20, 2017 [M101] LUNAR VOLCANISM 8:30 a.m. Waterway Ballroom 1 Chairs: Kerri Donaldson Hanna Jessica Barnes 8:30 a.m. Wilson L. * Head J. W. Origin of the Enigmatic Ina Mounds: Three-Stage Lunar Shield Volcano Eruption Sequence and MON ORALS Production and Extrusion of Magmatic Foam [#1288] The last stage of an initially explosive lunar eruption can generate a very vesicular lava with unusual rheological and crater-retention properties. 8:45 a.m. Qiao L. * Head J. W. Wilson L. Xiao L. Kreslavsky M. et al. Ina Pit Crater on the Moon: Extrusion of Waning-Stage Lava Lake Magmatic Foam Results in Extremely Young Crater Retention Ages [#1126] The Ina feature is formed through waning-stage lava lake processes >3 Byr ago, geologically recent effusive volcanic or gas venting activity is not required. 9:00 a.m. Stopar J. D. * Robinson M. S. van der Bogert C. H. Hiesinger H. Ostrach L. R. et al. TUES ORALS Young Lunar Volcanism: Irregular Mare Patches as Drained Lava Ponds and Inflated Flows [#1792] IMPs most likely represent the final residual materials associated with a drained lava pond or lake associated with volcanism occurring in the last few 100 myr. 9:15 a.m. Valencia S. N. * Jolliff B. L. Surface Properties of the Apennine Bench Formation [#2826] We examine the surface properties of the Apennine Bench Formation, such as elevation, chemical composition, and terrain ruggedness index. 9:30 a.m. Dhingra D. * Glotch T. D. Prissel T. C. Parman S. W. Pieters C. M. et al. Mg-Spinel Exposures Within Silica Rich Setting on Hansteen Alpha: Probing the WED ORALS Geologic Context [#2104] Out of the blue / Mg-spinel in silicic glue / Nobody has a clue / Probing to find if we can know. 9:45 a.m. McBride M. J. * Horgan B. Gaddis L. R. Mapping Glass in the Marius Hills Volcanic Complex with Moon Mineralogy Mapper [#2989] Glassy cinder cones / Reveal explosive history / Aristarchus like? 10:00 a.m. Elder C. M. * Hayne P. O. Thermophysical Properties of Lunar Volcanic Deposits [#2431] What can we learn from / The thermal inertia of / Lunar volcanoes? 10:15 a.m. Coman E. O. * Jolliff B. L. THURS ORALS Detection and Variability of TiO2 Using LROC WAC UVVIS Data at Calibration Sites [#2566] TiO2 derived from LROC WAC data are investigated for international science coordination and calibration sites, including Chang’e-3 and Apollo 11 and 17. 10:30 a.m. Barnes J. J. * McCubbin F. M. Boyce J. W. Nguyen A. N. Messenger S. Volatiles in High Titanium Basalts from the Moon [#1727] High K, high Ti mare basalts may have sampled Cl from a previously unidentified source within the Moon. FRI ORALS 48th LPSC Program 1 10:45 a.m. Rutherford M. J. * Head J. W. Saal A. E. Wilson L. Hauri E. A Model for the Ascent and Eruption of Lunar Picritic Magma Based on Experiments and Lunar Sample Data [#1557] The purpose of this paper is to integrate new data on C-O-H-S volatile solubility in lunar picritic magmas into a revised eruption and dike emplacement model. 11:00 a.m. McIntosh E. C. * Porrachia M. McCubbin F. M. Day J. M.D. Determination of Trace and Volatile Element Abundance Systematics of Lunar Pyroclastic Glasses MON ORALS 74220 and 15426 Using LA-ICP-MS [#1668] Moderately volatile element enrichment in lunar glasses 74220 and 15426 compared to mare basalts and possible enrichment of volatile elements on bead surface. 11:15 a.m. Burney D. * Neal C. R. Moderately Volatile Element Content of Apollo 17 Soil Sample 74220 Orange Glass Beads; Insights into the Moon’s Interior [#2099] The moderately volatile elements of the orange glass beads have been measured using solution mode ICP-MS, and compared to other lunar material. 11:30 a.m. Schmitt H. H. * Geology and Stratigraphy of Shorty Crater Pyroclastic Ash Deposits [#1072] TUES ORALS Stratigraphy of five pyroclastic ash units at Shorty Crater has been defined. Eruptions of ash occurred over ~150 Myr. Basaltic ejecta protected the ash units. 11:45 a.m. Schmitt H. H. * A Toast to Absent Friends: John Glenn, Ed Mitchell, and Gene Cernan Apollo 17 astronaut and lunar module pilot Harrison (“Jack”) Schmitt offers tributes and some personal thoughts on the recent passing of three pioneers of the American space program. Monday, March 20, 2017 [M102] SPECIAL SESSION: MARS VOLATILE SURFACE-ATMOSPHERIC INTERACTIONS: PAST AND PRESENT WED ORALS 8:30 a.m. Waterway Ballroom 4 Chairs: Ganna Portyankina George Nikolakakos 8:30 a.m. Titus T. N. * Cushing G. E. Mars Seasonal Cap Edges and CO2 Ice Column Density [#1198] We present the seasonal cap edges as a function of season and location. These functions are then used to determine the local column density of seasonal CO2 ice. 8:45 a.m. Piqueux S. Kleinböhl A. Hayne P. O. * Heavens N. G. Kass D. M. et al. THURS ORALS Widespread Low-Latitude Diurnal CO2 Frost on Mars [#1485] Using Mars Climate Sounder atmospherically corrected surface temperature observations, we show that low-latitude nighttime CO2 frost on Mars is widespread. 9:00 a.m. Hayne P. O. * Piqueux S. Kleinböhl A. Kass D. M. McCleese D. J. Global Patterns and Inter-Annual Variability in Carbon Dioxide Deposition on Mars: Infrared Observations from the Mars Climate Sounder [#2873] We present multi-year observations from the Mars Climate Sounder that show both patterns and variability in the deposition of CO2 at the poles of Mars. FRI ORALS 2 48th LPSC Program 9:15 a.m. Calvin W. M. * Seelos K. D. Compositional Variation of the Icy Units of the South Residual Polar Cap of Mars Using CRISM [#1604] CRISM targeted observations show CO2 ice spectra don’t vary strongly while water ice is an important and variable constituent in troughs and erosional surfaces. 9:30 a.m. Portyankina G. * Aye K.-M. Hansen C. J. Diffusion-Limited Aggregation Model for Araneiform Pattern Formation [#2441] A 2-D diffusion-limited aggregation model is implemented to describe the araneiform structures with the MON ORALS aim to study araneiform development process. 9:45 a.m. Thomas P. C. * Calvin W. M. James P. B. CO2 Deposition and Removal on Mars’ Residual South Polar Cap: Clues from Inverted Relief [#2041] Inversion of relief in the CO2 southern ice cap of Mars indicates local control of much of the deposition and erosion. 10:00 a.m. Litvak M. L. * Mitrofanov I. G. Sanin A. B. Boynton W. V. Inter-Annual Variations of Martian Seasonal Cycle from Longstanding Neutron Spectroscopy Observations Onboard Mars Odyssey [#2432] Using all available HEND/GRS/Odyssey data (from 2002 until now) we summarized results of TUES ORALS multiyear observations of seasonal variations of atmospheric CO2. 10:15 a.m. Pathare A. V. * Feldman W. C. Prettyman T. H. Maurice S. Driven by Excess? Climatic Implications of New Global Mapping of Near-Surface Hydrogen on Mars [#2543] We present improved maps of near-surface WEH (Water Equivalent Hydrogen) on Mars that have intriguing implications for the global distribution of excess ice. 10:30 a.m. Bramson A. M. * Byrne S. Bapst J. Survival of Mid-Latitude Ground Ice on Mars [#2692] We report on subsurface structure and martian climate variability over the past 10s of Myr that predicts ice preservation matching observational constraints. WED ORALS 10:45 a.m. Primm K. M. * Gough R. V. Tolbert M. A. Water Uptake and Release by Magnesium Perchlorate Mixed with Mars-Relevant Minerals [#1544] Results show that neither Mojave Mars Simulant (MMS) nor montmorillonite has an effect on the water uptake and release of magnesium perchlorate hexahydrate. 11:00 a.m. Wang A. * Ling Z. C. Yan Y. C. McEwen A. S. Mellon M. T. et al. Atmosphere – Surface H2O Exchange to Sustain the Recurring Slope Lineae (RSL) on Mars [#2351] The deliquescence rate of Cl-bearing salts matches w/RSL development and their rehydration occur at low T with H2O supplied by martian atmospheric circulation. 11:15 a.m. Nikolakakos G. * Whiteway J. A. THURS ORALS Laboratory Studies of Perchlorate Deliquescence and Water Adsorption at the Surface of Mars [#2683] Experiments show that samples of perchlorate and chabazite are capable of rapidly exchanging water with the atmosphere through deliquescence and adsorption. 11:30 a.m. Ehlmann B. L. * Sutter B. Edgett K. Litvak M. Achilles C. N. et al. The Nature, Carriers, and Exchangeability of Volatiles in Martian Soils: Evidence for Distinct Reservoirs from the Bagnold Dune Campaign and Other Measurements [#3011] What are the volatile reservoirs in the soils? How do they exchange? Here, we identify and describe two discrete volatile reservoirs: One geological, one modern. FRI ORALS 48th LPSC Program 3 Monday, March 20, 2017 [M103] TITAN: A MOON THAT RESEMBLES A PLANET 8:30 a.m. Waterway Ballroom 5 Chairs: Michael Malaska Jennifer Hanley 8:30 a.m. Chakraborty S. * Immekus C. Thiemens M. H. MON ORALS Investigating Formation and Evolution of Titan’s Atmosphere Through Its Isotopic Inventory and New Photochemical Studies [#2032] Convoluting the new isotopic results of NH3 photodissociation, past results, and isotopic inventory of Titan, a mechanism for Titan’s atmosphere will be made. 8:45 a.m. Miller K. E. * Glein C. R. Waite J. H. Jr. A New Source for Titan’s N2 Atmosphere: Outgassing from Accreted Organic-Rich Dust in Titan’s Interior [#2072] Isotopes, argon / Total abundance agree / Organics matter. 9:00 a.m. Brossier J. F. * Rodriguez S. Maltagliati L. Cornet T. Lucas A. et al. TUES ORALS Equatorial Belt of Titan Revisited Using a Comprehensive Radiative Transfer Model [#1399] Constrain the surface composition in Titan’s equatorial belt by using an heuristic correction and applying a radiative transfer model on VIMS IR observations.