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  • 1975-1979  (6)
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  • 1
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2019-06-27
    Description: Isopach maps and structural contour maps of the eastern mare basins (30 deg N to 30 deg S; 0 deg to 100 deg E), constructed from measurements of partially buried craters, are presented and discussed. The data, which are sufficiently scattered to yield gross thickness variations, are restricted to shallow maria with less than 1500-2000 m of mare basalts. The average thickness of basalt in the irregular maria is between 200 and 400 m. Correlations between surface topography, basalt thickness, and basin floor structure are apparent in most of the basins that were studied. The mare surface is commonly depressed in regions of thick mare basalts; mare ridges are typically located in regions of pronounced thickness changes; and arcuate mare rilles are confined to thin mare basalts. Most surface structures are attributed to shallow stresses developed within the mare basalts during consolidation and volume reduction.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-147400
    Format: application/pdf
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  • 2
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2019-06-27
    Description: An isopach map of the basalt thickness in the western mare basins is constructed from measurements of the exposed external rim height of partially buried craters. The data, although numerically sparse, is sufficiently distributed to yield gross thickness variations. The average basalt thickness in Oceanus Procellarum and adjacent regions is 400 m with local lenses in excess of 1500 m in the circular maria. The total volume of basalt in the western maria is estimated to be in the range of 1.5 x 10 to the 6th power cu km. The chief distinction between the eastern and western maria appears to be one of basalt volumes erupted to the surface. Maximum volumes of basalt are deposited west of the central highlands and flood subjacent terrain to a greater extent than on the east. The surface structures of the western maria reflect the probability of a greater degree of isostatic response to a larger surface loading by the greater accumulation of mare basalt.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-158784
    Format: application/pdf
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  • 3
    Publication Date: 2019-07-13
    Description: A geologic map of the Mare Smythii region of the moon is presented, and the configuration of the basin is defined. An isopach map of the total thickness of the undivided floor materials is based on the observed dependency of crater rim height to diameter of partially buried craters. Mare Smythii is one of the oldest of the circular basins. The proposed sequence of geologic events is (1) impact that produced the Smythii basin in pre-Imbrian time, (2) extensive period of large-scale pre-Imbrian cratering and isostatic adjustments, (3) deposition of pre-Imbrian and Imbrian plains material, (4) early Imbrian period of cratering followed by an extensive sequence of flows through late Imbrian time in the northeastern part of the basin, and (5) late period of cratering during Eratosthenian and Copernican time that produced young craters.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
    Format: text
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  • 4
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    Unknown
    In:  Other Sources
    Publication Date: 2019-07-13
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
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  • 5
    Publication Date: 2019-07-13
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 14, 1977 - Mar 18, 1977; Houston, TX
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  • 6
    facet.materialart.
    Unknown
    In:  Other Sources
    Publication Date: 2019-07-13
    Description: The thickness of mare basalts in the eastern maria are estimated and isopachs of the basalts are constructed. Sub-basalt basin floor topography is determined, and correlations of topographic variations of the surface with variations in basalt thickness or basin floor topography are investigated.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 15, 1976 - Mar 19, 1976; Houston, TX
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