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3 results on '"Calef, Fred J."'

1. Light-toned veins and material in Jezero crater, Mars, as seen in-situ via NASA's Perseverance rover (Mars 2020 mission): stratigraphic distribution and compositional results from the supercam instrument

Author

Nachon, Marion, López-Reyes, Guillermo, Meslin, Pierre-Yves, M. Ollila, Ann, Mandon, Lucia, Clavé, Elise, Forni, Olivier, Maurice, Sylvestre, Wiens, Roger, Gasnault, Olivier, Quantin-Nataf, Cathy, Mangold, Nicolas, Clegg, Samuel, Cousin, Agnès, Lasue, Jérémie, Dehouck, Erwin, Pilleri, Paolo, Team, The Supercam, Bell III, J.F., Horgan, Briony, Núñez, Jorge, Stack‐Morgan, Katie, Tebolt, Michelle, Caravaca, Gwénaël, Gupta, Sanjeev, Calef, Fred J., Crumpler, Larry, Siljeström, Sandra, Russell, Patrick, Williams, Amy, Shuster, David L., Rice, James, Brown, Adrian, Holm-Alwmark, Sanna, Kanine, Oak, Texas A&M University [College Station], Universidad de Valladolid [Valladolid] (UVa), Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Los Alamos National Laboratory (LANL), Division of Geological and Planetary Sciences [Pasadena], California Institute of Technology (CALTECH), Centre d'Etudes Lasers Intenses et Applications (CELIA), Université de Bordeaux (UB)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Planétologie et Géosciences [UMR_C 6112] (LPG), Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST), Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), Arizona State University [Tempe] (ASU), Johns Hopkins University Applied Physics Laboratory [Laurel, MD] (APL), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Department of Geological Sciences [Austin], Jackson School of Geosciences (JSG), University of Texas at Austin [Austin]-University of Texas at Austin [Austin], Department of Earth Science and Engineering [Imperial College London], Imperial College London, New Mexico Museum of Natural History and Science (NMMNHS), RISE Research Institutes of Sweden, Department of Earth, Planetary and Space Sciences [Los Angeles] (EPSS), University of California [Los Angeles] (UCLA), University of California (UC)-University of California (UC), Department of Geological Sciences [Gainesville] (UF|Geological), University of Florida [Gainesville] (UF), Berkeley Geochronology Center (BGC), School of Earth and Space Exploration [Tempe] (SESE), NASA Headquarters, Plancius Research LLC, University of Copenhagen = Københavns Universitet (UCPH), and Lunar and Planetary Institute

Subjects
Jezero crater, [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology, [SDU]Sciences of the Universe [physics], Mars 2020, [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], sedimentology, veins, diagenesis
Abstract

International audience; Within Jezero crater, the Perseverance rover currently explores the lowermost-exposed scarp of the delta (Fig. 1) [1,2]. Here we: (1) present the distribution of light-toned veins currently observed via the rover along its route in Jezero crater; (2) introduce compositional results of veins as analyzed via Perseverance’s SuperCam instrument, and place them into the context of results from the other instruments.

Published
2023

2. Evolved gas analyses of sedimentary rocks and eolian sediment in Gale Crater, Mars: Results of the Curiosity rover's sample analysis at Mars instrument from Yellowknife Bay to the Namib Dune

Author

Sutter, Brad, Mcadam, Amy C., Mahaffy, Paul R., Ming, Doug W., Edgett, Ken S., Rampe, Elizabeth B., Eigenbrode, Jennifer L., Franz, Heather B., Freissinet, Caroline, Grotzinger, John P., Steele, Andrew, House, Christopher H., Archer, P. Douglas, Malespin, Charles A., Navarro-González, Rafael, Stern, Jennifer C., Bell, James F., Calef, Fred J., Gellert, Ralf, Glavin, Daniel P., Thompson, Lucy M., Yen, Albert S., Jacobs Technology ESCG, NASA Johnson Space Center (JSC), NASA, NASA Goddard Space Flight Center (GSFC), Malin Space Science Systems (MSSS), Astromaterials Research and Exploration Science (ARES), NASA-NASA, Center for Research and Exploration in Space Science and Technology [GSFC] (CRESST), PLANETO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Division of Geological and Planetary Sciences [Pasadena], California Institute of Technology (CALTECH), Geophysical Laboratory [Carnegie Institution], Carnegie Institution for Science, Department of Geosciences [PennState], College of Earth and Mineral Sciences, Pennsylvania State University (Penn State), Penn State System-Penn State System-Pennsylvania State University (Penn State), Penn State System-Penn State System, Instituto de Ciencias Nucleares [Mexico], Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM), School of Earth and Space Exploration [Tempe] (SESE), Arizona State University [Tempe] (ASU), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Guelph-Waterloo Physics Institute, University of Guelph-University of Waterloo [Waterloo], Planetary and Space Science Centre (PASSC), University of New Brunswick (UNB), Carnegie Institution for Science [Washington], and Universidad Nacional Autónoma de México (UNAM)

Subjects
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
Abstract

International audience; The Sample Analysis at Mars instrument evolved gas analyzer (SAM-EGA) has detected evolved water, H2, SO2, H2S, NO, CO2, CO, O2 and HCl from two eolian sediments and nine sedimentary rocks from Gale Crater, Mars. These evolved gas detections indicate nitrates, organics, oxychlorine phase, and sulfates are widespread with phyllosilicates and carbonates occurring in select Gale Crater materials. Coevolved CO2 (160 ± 248 - 2373 ± 820 μgC(CO2)/g), and CO (11 ± 3 - 320 ± 130 μgC(CO)/g) suggest organic-C is present in Gale Crater materials. Five samples evolved CO2 at temperatures consistent with carbonate (0.32± 0.05 - 0.70± 0.1 wt.% CO3). Evolved NO amounts to 0.002 ± 0.007 - 0.06 ± 0.03 wt.% NO3. Evolution of O2 suggests oxychlorine phases (chlorate/perchlorate) (0.05 ± 0.025 - 1.05 ± 0.44wt. % ClO4) are present while SO2 evolution indicates the presence of crystalline and/or poorly crystalline Fe- and Mg-sulfate and possibly sulfide. Evolved H2O (0.9 ± 0.3 - 2.5 ± 1.6 wt.% H2O) is consistent with the presence of adsorbed water, hydrated salts, interlayer/structural water from phyllosilicates, and possible inclusion water in mineral/amorphous phases. Evolved H2 and H2S suggest reduced phases occur despite the presence of oxidized phases (nitrate, oxychlorine, sulfate, carbonate). SAM results coupled with CheMin mineralogical and APXS elemental analyses indicate that Gale Crater sedimentary rocks have experienced a complex authigenetic/diagenetic history involving fluids with varying pH, redox, and salt composition. The inferred geochemical conditions were favorable for microbial habitability and if life ever existed, there was likely sufficient organic-C to support a small microbial population.

Published
2017
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3. Seasonal seismic activity on Mars

Author

Knapmeyer, Martin, Stähler, Simon Christian, Daubar, Ingrid J., Forget, François, Spiga, Aymeric, Pierron, T., van Driel, Martin, Banfield, Don, Hauber, Ernst, Grott, Matthias, Muller, N., Perrin, Clément, Jacob, Alice, Lucas, Antoine, Knapmeyer-Endrun, Brigitte, Newman, Claire, Panning, Mark P., Weber, Renee, Calef, Fred J., Böse, Maren, Ceylan, Savas, Charalambous, Constantinos, Clinton, John Francis, Dahmen, Nikolaj, Giardini, Domenico, Horleston, Anna, Kawamura, Taichi, Khan, Amir, Mainsant, Guénolé, Plasman, Matthieu, Lemmon, Mark, Lorenz, Ralph, Pike, W.T., Scholz, John‐Robert, Lognonne, Philippe, and Banerdt, Bruce

Subjects
Phobos, seasonal seismic activity, 13. Climate action, Elysium Planitia, Mars, InSight
Abstract

The rate of occurrence of High Frequency (HF) marsquakes, as recorded by InSight at Homestead Hollow, Elysium Planitia, increased after about Ls =33°, and ceased almost completely by Ls =187°, following an apparently seasonal variation with a peak rate near aphelion. We define seismic rate models based on the declination of the Sun, annual solar tides, and the annual CO2 cycle as measured by atmospheric pressure. Evaluation of Akaike weights and evidence ratios shows that the declination of the Sun is the most likely, and the CO2 cycle the least likely driver of this seismic activity, although the discrimination is weak, and the occurrence of a few events in August 2020 is in favor for a triggering by CO2 ice load. We also show that no periodicity related to Phobos' orbit is present in the HF event sequence. Event rate forecasts are presented to allow further discrimination of candidate mechanisms from future observations., Earth and Planetary Science Letters, 576, ISSN:0012-821X, ISSN:1385-013X

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