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  • 1
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    Accretionary dark rims in unequilibrated chondrites (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Textural and qualitative EDX investigations of dark-rimmed particles in six low petrologic type chondrites indicate that the rims accreted on host particles over a wide range of temperatures prior to initial accumulation and lithification of the meteorites in which the rimmed particles are now contained. Many dark rims are enriched in moderately volatile trace elements such as Na, Cl, P, and K, relative to the host particles and matrix. The range of physical/chemical environments associated with hypervelocity impacts may have offered the setting for the formation of dark-rimmed particles early in solar system history.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 48; Dec. 198
    Format: text
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  • 2
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    Size and modal analyses of fines and ultrafines from some Apollo 17 samples (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Scanning electron and optical microscopy techniques have been used to determine the grain-size frequency distributions and morphology-based modal analyses of fine and ultrafine fractions of some Apollo 17 regolith samples. There are significant and large differences between the grain-size frequency distributions of the less than 10-micron size fraction of Apollo 17 samples, but there are no clear relations to the local geologic setting from which individual samples have been collected. This may be due to effective lateral mixing of regolith particles in this size range by micrometeoroid impacts. None of the properties of the frequency distributions support the idea of selective transport of any fine grain-size fraction, as has been proposed by other workers. All of the particle types found in the coarser size fractions also occur in the less than 10-micron particles. In the size range from 105 to 10 microns there is a strong tendency for the percentage of regularly shaped glass to increase as the graphic mean grain size of the less than 1-mm size fraction decreases, both probably being controlled by exposure age.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
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  • 3
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    Accretionary dark rims in unequilibrated chondrites (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: HIG-CONTRIB-1313-VOL-2 , Hawaii Univ. Contrib. of the Hawaii Inst. of Geophys., Vol. 2; 13 p
    Format: text
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  • 4
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    The Inman, McPherson County, Kansas meteorite (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Inman meteorite (find, 1966) is a single relatively unweathered stone of 7.25 kg that contains fresh metal and only a few weathering products away from fractures. It has a pronounced chondritic texture, with 38 vol% of the meteorite being made up of chondrules of virtually all textural types. The recalculated bulk analysis, in particular ratios involving iron content, indicate that Inman is an L-group chondrite. The pronounced chondritic texture; the compositional variation of olivine, pyroxene, chromite, and ilmenite; and the presence of a fine-grained nearly opaque matrix, glass, and twinned monoclinic low-Ca pyroxene indicate that the chondrite belongs to petrologic type 3.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics; 13; Mar. 31
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  • 5
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    The Del Rio ataxite, Texas (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Basic data are presented on the Del Rio, Nordheim, and Monahans ataxites found in Texas. Results are reported for bulk-chemistry analysis, metallographic observations, and electron-microprobe analysis of the Del Rio meteorite. It is shown that Del Rio is distinctly different from the other two ataxites in terms of nickel, phosphorous, and carbon content, and is composed of at least three coarse grains in different crystallographic orientations. All the kamacite in Del Rio is found to have transformation structures that are probable shock products, and minor inclusions of daubreelite, schreibersite, and troilite are observed. It is concluded that Del Rio was apparently mildly shocked prior to its fall.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics; 12; Mar. 31
    Format: text
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  • 6
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    Lunar magnetic permeability studies and magnetometer sensitivity (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A regression of quiet magnetic field components simultaneously measured by the two Explorer 35 magnetometers reveals uncertainties in effective sensitivity factors of up to a few percent in one or both of these instruments. Given this, the validity of previous lunar permeability studies based on Explorer 35/ALSEP regressions, wherein inferences are drawn from regression line slopes differing from unity by the order of one percent, is called into question. We emphasize the need to critically address the question of small deviations in magnetometer sensitivity factors from nominal values as a part of any two-magnetometer lunar permeability study.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters; 4; Apr. 197
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  • 7
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    New spectral observations of Callisto and leading/trailing hemisphere distinctions (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: In December 1989 and January 1990, new observations of the leading and trailing edges of Callisto were made from the NASA Infrared Telescope Facility on Mauna Kea in Hawaii. Using the Cool Grating Array Spectrometer, spectral coverage was obtained from 1.89 to 2.46 microns and from 2.8 to 4.2 microns for both the leading and trailing hemispheres. In addition, spectral coverage of the leading hemisphere was obtained from 1.30 to 2.55 microns and from 4.2 to 4.8 microns. Interpretations of the data are given.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990; p 294-295
    Format: application/pdf
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  • 8
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    Spectral evidence for carbonates on Mars: Hydrous carbonates (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Although many of the spectral features of the Martian samples studied are not unique mineralogical indicators, much of the current spectral data is consistent with (possibly abundant) hydrous carbonates on the surface of Mars. The absorption features in the measured samples were quite weak compared with those of anhydrous carbonates. The weak features imply that significantly more hydrous carbonates can be incorporated onto the surface before becoming spectrally evident; however, exact limits have yet to be determined. The stability of these materials in the Martian environment is not known, but their formation and occurrence in low temperature terrestrial environments makes them appealing candidates for weathering products on Mars.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990; p 244-245
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  • 9
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    Some probable characteristics of the Martian regolith (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: A number of Mars surface environmental factors seriously affect the properties of the Martian regolith. The result is a regolith that is rather different from that of the moon. Some of the anticipated differences are discussed: weathering and lack of old glass; desert varnish; lack of micrometeorite impact products; abundance of meteorite fragments; and different grain size characteristics.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Inst., MEVTV Workshop on Nature and Composition of Surface Units on Mars; p 74-75
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  • 10
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    Evidence for ammonium-bearing minerals in Ceres (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Evidence for ammonium-bearing minerals was found on the surface of the largest asteroid Ceres. The presence of ammonium-bearing clays suggests that Ceres has experienced a period of alteration by substantial amounts of an ammonium-bearing fluid. The presence of the ammonium-bearing clays does not preclude Ceres maintaining a volatile inventory in the core or in a volatile-rich zone at some distance below the surface. Telescopic observations of Ceres, using the 3.0 meter NASA Infrared telescope facility prompted this reevaluation of its surface mineralogy.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Inst., 22nd Lunar and Planetary Science Conference; p 31-33
    Format: application/pdf
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