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  • 1975-1979  (8)
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  • 1
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    Unknown
    Heterogeneities in the solar nebula (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Oxygen isotopic compositions of the high-temperature phases in carbonaceous chondrites define a mixing line with an 0-16-rich component and show little superimposed chemical isotope fractionation. Within a single inclusion in Allende, variations of delta 0-18 and delta 0-17 of 39 thousands are found. The ordinary chondrites are slightly displaced from the terrestrial fractionation trend, implying that at least 0.2 percent of the oxygen in terrestrial rocks was derived from the 0-16-rich component.
    Keywords: ASTROPHYSICS
    Type: NASA, Washington The Soviet-Am. Conf. on Cosmochem. of the Moon and Planets, Pt. 2; p 781-785
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Distribution of the pre-solar component in Allende and other carbonaceous chondrites (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Detailed analyses of separated phases of several Allende Ca-Al-rich inclusions are reported which reveal a consistent pattern of large O-16 enrichments in spinel, pyroxene, and sometimes olivine, and small O-16 enrichments in melilite, feldspathoids, and grossular. The heterogeneous distribution of the O-16 excesses, together with their enhancement in minerals believed to be early solar nebular condensates, suggests the existence of pre-solar carriers of the isotopic anomaly, probably grains or molecules with oxygen which was nearly pure O-16. Pre-solar grains of corundum or spinel, and pre-solar molecules of SiO are considered possibilities. Excess O-16, relative to terrestrial abundances, has been found in all samples of C2, C3 (the Allende is this kind), and C4 carbonaceous chondrites which have been analyzed. No direct correlation has yet been observed between the oxygen anomalies and isotope anomalies in neon, magnesium, or xenon.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters; 34; 2, Ma; Mar. 197
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    NASA TECHNICAL REPORTS
  • 3
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    Genetic relations between the moon and meteorites (1975)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The moon is shown to have an oxygen isotope distribution similar to that of the earth and the differentiated meteorites (achondrites, mesosiderites, pallasites, irons) but, according to the same criterion, the moon is unrelated to the ordinary chondrites or carbonaceous chondrites. The principal differences between the inferred chemical composition of the moon and that of chondritic meteorites is the depletion of volatile and semivolatile elements, the enrichment of uranium by a factor of 10-15, and the enrichment of the source regions of mare basalts in LIL elements by a factor of 5-10. The reported data support the theory that the moon was formed by the capture of differentiated meteorites. Volatile-element depletion and 'refractory' element enrichment are considered.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
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    NASA TECHNICAL REPORTS
  • 4
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    Consortium investigation of breccia 67435 (1976)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The paper presents results of the initial phase of a consortium investigation of lunar rock 67435, a glass coated breccia which contains a unique spinel-troctolite clast. These results include oxygen isotopic data for the host breccia, bulk composition data for the host breccia, glass coating and a large aphanitic clast, and detailed petrographic descriptions of all lithologies encountered.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 15, 1976 - Mar 19, 1976; Houston, TX
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  • 5
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    Characterization of lunar nitrogen components (1976)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Rocks of known and disparate cosmic-ray ages are analyzed to find the spallation production rate of N-15. A soil breccia of known formation age was analyzed for its bearing on the antiquity of the isotopically light component. Further stepwise heating analysis of soils shed further light on occurrences of the components. Lunar soil samples were etched slightly by fluorine, revealing significant differences in isotopic ratios between carbon on grain surfaces and bulk carbon; the surface carbon is not retained during agglutinate formation. Etching revealed that about 25% of the total nitrogen resides on the surface of grains; the nitrogen is isotopically heavy. Etching also revealed about 50% of helium in soils residing below the readily etched outermost 1% of soil grain surfaces.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 15, 1976 - Mar 19, 1976; Houston, TX
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  • 6
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    Oxygen isotopic composition of minerals in the Kenna ureilite (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 40; Dec. 197
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  • 7
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    Oxygen isotope fractionation in Apollo 17 rocks (1975)
    In:  Other Sources
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    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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  • 8
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    Isotopic fractionation of silicon in Allende inclusions (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The variations of Si-30/Si-28 and Si-29/Si-28 in Allende inclusions are large, and are due predominantly to mass-dependent fractionation effects. Gas-soild or gas-liquid condensation processes at high temperatures have sufficiently large fractionation factors to account for the heavy-isotope enrichments in coarse-grained inclusions. Heavy isotope depletions are found in some Allende samples, and apparently result from a late-stage condensation. Thus, the silicon isotopic compositions may be useful for determining the sequence of events in forming the Allende meteorite. The peculiar Allende inclusion, Cl, has a very large mass-fractionated enrichment of Si-30/Si-28, and in addition, perhaps a small nuclear enrichment of Si-29. Olivine from the unusual pallasite, Eagle Station, has normal silicon isotope abundances even though it has a large O-16 excess.
    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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