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  • LUNAR AND PLANETARY EXPLORATION  (6)
  • Seismicity  (1)
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  • 1
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    Temperature field and geophysical effects of a down going slab (1971)
    In:  J. Geophys. Res., Warszawa, EGS, vol. 76, no. 1, pp. 1113-1138, pp. B05S16, (ISSN: 1340-4202)
    Details
    Publication Date: 1971
    Keywords: Geothermics ; Plate tectonics ; Subduction zone ; Seismicity ; JGR ; Toksoez ; Toksoz
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Consideration of sample return and the exploration strategy for Mars (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The scientific rationale and requirements for a Mars surface sample return were examined and the experience gained from the analysis and study of the returned lunar samples were incorporated into the science requirements and engineering design for the Mars sample return mission. The necessary data sets for characterizing Mars are presented. If further analyses of surface samples are to be made, the best available method is for the analysis to be conducted in terrestrial laboratories.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-58213 , JSC-14864
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The lunar magma ocean - A transient lunar phenomenon (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The time required for the solidification of a lunar magma ocean is considered. In the absence of a thermal boundary crust, heat loss is by radiation and the ocean will solidify in a few decades. However, only a few millimeters of crust would effectively limit radiation. The current investigation has the objective to present estimates of conduction boundary (crust) thickness based on several models of the mechanism of crustal formation. Three different models for estimating conduction boundary layer thickness are discussed. They are based on the formation of a chill margin, a plagioclase flotation layer, and a layer which is continually destroyed by meteorite impacts and regrows by conductive heat loss. Based on these models, the maximum solidification time for a 200 km thick ocean is about 100 million years. A more probable solidification time based on a plagioclase flotation crust model is about 60 million years.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 17, 1980 - Mar 21, 1980; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A physical and chemical model of early lunar history (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A 'cool' thermal model of the moon's early history is discussed in terms of lunar petrology. Heat from the totally molten outer half of the moon's volume was, according to the model, lost to space and to the lunar interior, so that, barring additions of heat from external sources, all petrogenesis operating exclusively on material of the initially totally molten zone must have occured in an environment of decreasing temperatures. Mare basalts would result from hybridization by migration, mixing, and reequilibration of a variety of intercumulus liquids. Evidence is considered for the layered structure and a significant structural boundary that should result from differentiation of the approximately 350-km-thick initially totally molten zone. Magnetization of lunar rocks is considered.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Crystallization of a lunar magma ocean (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The results of applying the presently most detailed thermal model to the cooling, crystallization and differentiation of a lunar magma ocean are used to delineate its general features, i.e., those features that are model independent within reasonable variations in ocean characteristics. Two primitive lunar compositions are used to illustrate the effect of different compositions and phase equilibria on the solidification time and mineralogy of magma oceans. The magma ocean thermal model led to some inferences about the thermal evolution of the outer portion of the moon modeled as isolated magma pods rather than as a magma ocean.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 13, 1978 - Mar 17, 1978; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Petrogenesis in a modestly endowed moon (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Four lines of recent evidence show that the moon is more modestly endowed in refractory elements and heat sources than previously thought. However, even this reduced endowment is adequate for the genesis of known lunar rock types. The thickness and nature of the initially molten zone and the structure of the crust and the lithosphere produced from it are the major uncertainties in models of lunar petrogenesis.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 15, 1976 - Mar 19, 1976; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Lunar mare basalts - Conference summary (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Compositionally, lunar mare basalts are similar to some very young subalkaline basalts from terrestrial mid-ocean ridges and to very old pods of basaltic material incorporated into ancient metamorphic rocks. Basalt flows in Mare Imbrium are considered, taking into account the results of orbital gamma ray spectroscopic studies. The results of the analyses of lunar samples obtained from the Apollo missions are evaluated and various models are discussed in connection with an interpretation of the observed conditions.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: EOS; 57; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
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