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  • Geophysics  (4)
  • LUNAR AND PLANETARY EXPLORATION  (3)
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  • 1
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    Geology of Io (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Geologic mapping of the Jovian satellite Io has been completed at 1:15,000,000 scale for an area lying between +40 and -90 deg latitude and 230 and 45 deg longitude, which includes portions of the Ruwa Patera quadrangle (Ji2) and the Lerna Region (Ji4) and the westernmost section of the Colchis Region (Ji3). Image resolution in the mapped area is commonly 0.5 to 2 km/pxl. High resolution areas (less than .5 km/pxl) are located near the south pole (Lerna Region) and in eastern Ruwa Patera quadrangle. Geologic maps for the Ruwa Patera quadrangle (Ji2) and the Lerna Region (Ji4) have been produced at 1:5,000,000 scale. The present effort reexamines the previously mapped areas and synthesizes the geology of Io on a global scale.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 519-521
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Explosive volcanic deposits on Mars: Preliminary investigations (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Two investigations were undertaken to examine possible large scale explosive volcanic deposits on Mars. The first includes an analysis of Viking Infrared Thermal Mapper (IRTM) data covering the vast deposits in the Amazonis, Memnonia, and Aeolis regions. These postulated ignimbrites have been previously mapped, and at least five high resolution nighttime IRTM data tracks cross the deposits. Preliminary analysis of the data covering Amazonis Planitia show that local features have anomalous thermal inertias but the ignimbrites as a whole do not consistently have significantly different thermal inertias from their surroundings. Preliminary photogeologic and IRTM studies of the large and small highland paterae have also begun. The purpose of IRTM studies of postulated Martian explosive volcanic deposits is to determine the physical properties of the proposed ignimbrites. If volcanic deposits are exposed at the surface, high thermal inertias, as are observed for Apollinaris Patera, should be present.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 327-329
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    NASA TECHNICAL REPORTS
  • 3
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    Observations of industrial sulfur flows and implications for Io (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The possibility of sulfur flows on the Jovian satellite Io is discussed. Although the primary problem is lack of sufficient information to resolve the issue, interpretations of existing data are hampered by poor knowledge of the thermal properties and rheologic behavior of sulfur flows, especially under conditions present on Io. Relatively few natural sulfur flows occur on Earth and only one has been seen in active flow. However, recent observations of industrial sulfur flows, which are much larger than those produced experimentally, may provide important information concerning natural sulfur flows on both Earth and Io.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 514-516
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    NASA TECHNICAL REPORTS
  • 4
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    In Situ Geochronology of Planetary Surfaces: Application of the Rubidium-Strontium Isotope System (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The Rb-Sr isotope system shows promise for use on an in situ geochronology instrument. Additional information is contained in the original extended abstract.
    Keywords: Geophysics
    Type: Eleventh Annual V. M. Goldschmidt Conference; LPI-Contrib-1088
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Geologic Mapping of MTM -30247, -35247 and -40247 Quadrangles, Reull Vallis Region of Mars (2008)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: Geologic mapping and stratigraphic analyses of MTM -30247, -35247, and -40247 quadrangles are being used to characterize the Reull Vallis (RV) system and to determine the history of the eastern Hellas region of Mars. Studies of RV examine the roles and timing of volatile-driven erosional and depositional processes and provide constraints on potential associated climatic changes. This study complements earlier investigations of the eastern Hellas region, including regional analyses [1-6], mapping studies of circum-Hellas canyons [7-10], and volcanic studies of Hadriaca and Tyrrhena Paterae [11-13]. Key scientific objectives for these quadrangles include 1) characterization of RV in its "fluvial zone," 2) analysis of channels in the surrounding plains and potential connections to and interactions with RV, 3) examination of young (?), presumably sedimentary plains along RV that embay the surrounding highlands, and 4) determination of the nature of the connection between segments 1 and 2 of RV.
    Keywords: Geophysics
    Type: Abstracts of the Annual Meeting of Planetary Geologic Mappers, Flagstaff, AZ, 2008; NASA/CP-2008-215469
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    NASA TECHNICAL REPORTS
  • 6
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    Volcanism on Io: Insights from Global Geologic Mapping (2009)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: We are preparing a new global geo-logic map of Jupiter s volcanic moon, Io. Here we report the type of data that are now available from our global mapping efforts, and how these data can be used to investigate questions regarding the volcano-tectonic evolution of Io. We are using the new map to investigate several specific questions about the geologic evolution of Io that previously could not be well addressed, including (for example) a comparison of the areas vs. the heights of Ionian mountains to assess their stability and evolution (Fig. 1). The area-height relationships of Io s visible mountains show the low abundance and low relief of volcanic mountains (tholi) relative to tectonic mountains, consistent with formation from low-viscosity lavas less likely to build steep edifices. Mottled mountains are generally less high than lineated mountains, consistent with a degradational formation.
    Keywords: Geophysics
    Type: Abstracts of the Annual Meeting of Planetary Geologic Mappers, San Antonio, TX, 2009; 47-48; NASA/CP-2010-216680
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  • 7
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    Geologic Mapping of MTM -30247, -35247 and -40247 Quadrangles, Reull Vallis Region, Mars (2009)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Geologic mapping of MTM -30247, -35247, and -40247 quadrangles is being used to characterize Reull Vallis (RV) and to determine the history of the eastern Hellas region of Mars. Studies of RV examine the roles and timing of volatile-driven erosional and depositional processes and provide constraints on potential associated climatic changes. This study complements earlier investigations of the eastern Hellas region, including regional analyses [1-6], mapping studies of circum-Hellas canyons [7-10], and volcanic studies of Hadriaca and Tyrrhena Paterae [11-13]. Key scientific objectives include 1) characterizing RV in its "fluvial zone," 2) analysis of channels in the surrounding plains and potential connections to and interactions with RV, 3) examining young, presumably sedimentary plains along RV, and 4) determining the nature of the connection between the segments of RV.
    Keywords: Geophysics
    Type: Abstracts of the Annual Meeting of Planetary Geologic Mappers, San Antonio, TX, 2009; 31-32; NASA/CP-2010-216680
    Format: application/pdf
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