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  • SPACE SCIENCES  (9)
  • 1
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    Apollo 15 green glasses. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The samples analyzed include 28 spheres, portions of spheres, and angular fragments from soil 15101. Emerald green glasses from other soils are identical to those from 15101. The composition of the green glass is unlike that of any other major lunar glass group. The Fe content is comparable to that in mare basalts, but Ti is much lower. The Mg content is much higher than in most lunar materials analyzed to date, and the Cr content is also high. The low Al content is comparable to that of mare basalt glasses.
    Keywords: SPACE SCIENCES
    Type: Physics of the Earth and Planetary Interiors; 7; June 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Luna 20 soil - Abundance and composition of phases in the 45-125 micron fraction. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Glass compositions in the Luna 20 soil indicate a minor contribution of mare rocks and a major contribution of highly feldspathic highland material. Glasses with the composition of highland basalt (anorthositic gabbro or norite) predominate in a range of highly aluminous glasses. The analyses of minerals in the soil show that the highland rocks have a unique assemblage of minerals that can readily be distinguished from the mineral assemblages of either mare or KREEP basalts. The soils are characterized by abundant anorthitic, low-Fe plagioclase. Highly magnesian orthopyroxenes, pigeonites, and augites are the most prominent pyroxenes. Unlike mare basalt pyroxenes, clinopyroxenes with intermediate Ca values are not abundant, but extreme iron enrichment toward pyroxferroite does occur. Olivines are more abundant than at other sites and are Mg-rich, low in Ca and Cr. Spinels with compositions approaching MgAl2O4 predominate over pleonastes and chromites. Ilmenite and metal are present but not abundant. The mineral compositions are consistent with derivation from a suite of highly feldspathic rocks in which highland basalt compositions predominate.
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
  • 3
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    Microprobe analyses of glasses and minerals from Luna-16 soil (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Electron microprobe analyses are presented for nine elements in 250 glasses and 434 pyroxenes, eight elements in 113 olivines, and six elements in 354 feldspars, 35 spinels, and 159 ilmenites. All grains are from the 125-425 micron fraction of horizon A and horizon D soil from the Luna 16 sample. A norm is presented for each glass analysis and the structural formula is calculated for each mineral analysis.
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-58082
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Crystallization history of metal particles in Apollo 16 rake samples (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Electron microprobe analyses for Fe, Co, Ni, S, and P have been carried out on the metal and associated troilite, schreibersite, and rare cohenite in the Apollo 16 rake samples from Stations 1, 4, and 13. The Co/Ni ratios of most of the metal are within the limits of meteoritic metal as defined by Goldstein and Yakowitz (1971). The large abundance of schreibersite in all of the lithic types except the poikilitic rocks suggests that much of it may be of lunar origin. The near-absence of schreibersite in the poikilitic rocks may be a result of P diffusion from the metal to the surrounding silicate at low temperature. Application of the compositional data for the coexisting metal-schreibersite pairs to isotherms in the system Fe-Ni-P indicates a sequence of progressively lower temperatures of equilibration (and probably a corresponding sequence of slower cooling rates) of these phases from the devitrified glasses, to the mesostasis-rich rocks, to the diabases, to the poikilitic rocks.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Mar 05, 1973 - Mar 08, 1973; Houston, TX
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    NASA TECHNICAL REPORTS
  • 5
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    Glass compositions in Apollo 16 soils 60501 and 61221 (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Mar 05, 1973 - Mar 08, 1973; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Petrology of Apollo 16 poikilitic rocks (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The petrology of 13 poikilitic rocks returned by Apollo 16 is described, and the mechanisms which likely participated in their formation are explained. The specimens include 11 rake samples from stations 1, 4, and 13 and the two large rocks 60315 and 65015. The poikilitic rocks are proposed to form by crystallization of an impact generated partial melt with over 70% liquid. The protolith consists of gas bearing polymict breccias and/or soil.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Mar 05, 1973 - Mar 08, 1973; Houston, TX
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    NASA TECHNICAL REPORTS
  • 7
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    Metamorphism of Apollo 14 breccias. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: All Apollo 14 breccias for which thin sections are available (27 rocks) were studied petrographically. From one sample in each of six groups, electron microprobe analyses were performed on matrix (less than 25 microns) plagioclase, pyroxene, and olivine and of rims and cores of plagioclase and pyroxene clasts (50 to 300 microns). Matrix plagioclase, pyroxene, and olivine in the high-grade rocks display a narrow range of compositions, suggesting an equilibrated or metamorphic origin. However, in the low-grade rocks a wide range of compositions, suggesting a detrital or unequilibrated origin, is observed. Partially equilibrated states are observed in medium-grade samples. It is concluded that the Apollo 14 breccias formed as part of the Imbrium Basin ejecta blanket - the Fra Mauro formation. The continuous nature of the metamorphic series suggests that the medium- and high-grade breccias were derived from unmetamorphosed equivalents by autometamorphism in the thick, hot Fra Mauro formation at the Apollo 14 site.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Jan 10, 1972 - Jan 13, 1972; Houston, TX
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    NASA TECHNICAL REPORTS
  • 8
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    Apollo 16 rocks - Classification and petrogenetic model (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Apollo 16 rocks include cataclastic anorthosites, two varieties of unequilibrated breccia, two varieties of partly to fully equilibrated breccia, and a sequence of partially melted breccias. The latter, which dominate the Apollo 16 collection, include glass, divitrified glass, mesostasis-olivine-plagioclase rock, mesostasis-rich basalt, basalt, and poikilitic rocks. All sequence members contain vesicles and relics of plagioclase, olivine, pink spinel, and lithic fragments. Their equilibrated matrices define a series from glass, to a plagioclase-olivine-mesostasis assemblage displaying spherulitic and skeletal shaped crystals, through a plagioclase-pyroxene-olivine assemblage displaying euhedral shaped crystals. Such data suggest that the sequence lithologies were derived from breccias or soils that were partially melted in an impact event.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Mar 05, 1973 - Mar 08, 1973; Houston, TX
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    NASA TECHNICAL REPORTS
  • 9
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    Lunar crystalline rocks - Petrology and geology (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Apollo 11 and 12 crystalline rocks petrographical analysis and textural-mineralogical-chemical group classification, considering local stratigraphy reconstruction
    Keywords: SPACE SCIENCES
    Type: LUNAR SCIENCE CONFERENCE; Jan 11, 1971 - Jan 14, 1971; HOUSTON, TX
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    NASA TECHNICAL REPORTS
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