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  • 1
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    Unknown
    Origin of lunar feldspathic rocks (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Melting experiments and petrographic studies of lunar feldspathic rocks reveal possible genetic relationships among several compositionally and mineralogically distinct groups of lunar rocks and soil fragments. Dry, low PO2 partial melting of crustal anorthositic norites of the anorthositic-noritic-troctolitic (ANT) suite produces liquids of the KREEP-Fra Mauro basalt type; dry, low PO2 partial melting of pink spinel troctolite (PST) produces liquids of the 'very high alumina basalt' or microtroctolite type. Both ANT and PST are probable components of the primitive terra crust. If crystal fractionation in a cooling basaltic liquid could have produced such a crust, it would also produce a mafic interior capable of yielding mare basalts by later remelting at depth.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 20; 3; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Experimental petrology and origin of Fra Mauro rocks and soil (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Melting experiments over the pressure range 0 to 20 kilobars were conducted on Apollo 14 igneous rocks 14310 and 14072 and on comprehensive fines 14259. The mineralogy and textures of rocks 14310 and 14072 are presumed to be the result of near-surface crystallization. The chemical compositions of the samples show special relationships to multiply-saturated liquids in the system: anorthite-forsterite-fayalite-silica at low pressure. Partial melting of a lunar crust consisting largely of plagioclase, low calcium pyroxene, and olivine, followed by crystal fractionation at the lunar surface is proposed as a mechanism for the production of the igneous rocks and soil glasses sampled by Apollo 14.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-126656
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Petrography and crystallization history of basalts 14310 and 14072. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Jan 10, 1972 - Jan 13, 1972; Houston, TX
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    NASA TECHNICAL REPORTS
  • 4
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    Petrology of rock 12002 and origin of picritic basalts at Oceanus Procellarum (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
  • 5
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    Experimental petrology and origin of rocks from the Descartes Highlands (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Petrographic studies of Apollo 16 samples indicate that rocks 62295 and 68415 are crystallization products of highly aluminous melts. 60025 is a shocked, crushed and partially annealed plagioclase cumulate. 60315 is a recrystallized noritic breccia of disputed origin. 60335 is a feldspathic basalt filled with xenoliths and xenocrysts of anorthosite, breccia, and anorthite. The Fe/(Fe+Mg) of plagioclase appears to be a relative crystallization index. Low pressure melting experiments with controlled Po2 indicate that the igneous samples crystallized at oxygen fugacities well below the Fe/FeO buffer. Crystallization experiments at various pressures suggest that the 62295 and 68415 compositions were produced by partial or complete melting of lunar crustal materials, and not by partial melting of the deep lunar interior.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Mar 05, 1973 - Mar 08, 1973; Houston, TX
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    NASA TECHNICAL REPORTS
  • 6
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    Experimental petrology and origin of Fra Mauro rocks and soil. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Results of melting experiments over the pressure range from 0 to 20 kb on Apollo 14 igneous rocks 14310 and 14072, and on comprehensive fines 14259. It is found that low-pressure crystallization of rocks 14310 and 14072 proceeds as predicted from the textural relationships displayed by thin sections of these rocks. The mineralogy and textures of these rocks are the result of near-surface crystallization. The chemical compositions of these lunar samples all show special relationships to multiply saturated liquids in the system anorthite-forsterite-fayalite-silica at low pressure. Partial melting of a lunar crust consisting largely of plagioclase, low-calcium pyroxene, and olivine, followed by crystal fractionation at the lunar surface, is a satisfactory mechanism for the production of the igneous rocks and soil glasses sampled by Apollo 14. The KREEP component of other lunar soils, may have a similar origin.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Jan 10, 1972 - Jan 13, 1972; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
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