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  • Other Sources  (7)
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  • 1
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    Element distribution and noble gas isotopic abundances in lunar meteorite Allan Hills A81005 (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Antarctic meteorite ALLAN HILLS A81005, an anorthositic breccia, is recognized to be of lunar origin. The noble gases in this meteorite were analyzed and found to be solar-wind implanted gases, whose absolute and relative concentrations are quite similar to those in lunar regolith samples. A sample of this meteorite was obtained for the analysis of the noble gas isotopes, including Kr(81), and for the determination of the elemental abundances. In order to better determine the volume derived from the surface correlated gases, grain size fractions were prepared. The results of the instrumental measurements of the gamma radiation are listed. From the amounts of cosmic ray produced noble gases and respective production rates, the lunar surface residence times were calculated. It was concluded that the lunar surface time is about half a billion years.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst. International Workshop on Antarctic Meteorites; p 61-64
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Meteoritic trace elements in lunar rock 14321, 184 (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Measurements are given for sixteen trace elements determined by radiochemical neutron activation analysis in six samples of four components of lunar rock 14321, 184. The samples were of basalt (1B), matrix (9A), microbreccia-2 (15), and microbreccia-3 (14A, 16A, and 19A) components. The ancient meteoritic components in the samples were determined according to the ratios of siderophile elements (Ir/Au and Ge/Au) found in the samples.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 39; Mar. 197
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    NASA TECHNICAL REPORTS
  • 3
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    The simultaneous determination of 20 trace elements in terrestrial, lunar and meteoritic material by radiochemical neutron activation analysis (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A radiochemical neutron activation method has been developed and applied to determine the content of 20 trace elements (Ag, Au, Bi, Br, Cd, Co, Cs, Cu, Ga, Ge, In, Ir, Ni, Rb, Re, Sb, Te, Tl, and Zn) in 45 terrestrial, 230 lunar, and 70 meteoritic samples. Results obtained for the U.S.G.S. standard basalt BCR-1 indicate that the inherent precision for most elements is 10% or better. The values obtained for the trace elements investigated are compared to those previously reported in the literature. Data for Type I carbonaceous chondrites show their compositions to be far more uniform than previously supposed. The values obtained for several elements represent significant revisions in the accepted cosmic abundances. These new values include: Zn, 1250; Cd, 1.51; and Ir, 0.72 atoms/million Si atoms. Further results have provided insight into the meteoritic material and accretion of the moon, and give evidence of lunar highland vulcanism.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Analytica Chimica Acta; 72; 1974
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  • 4
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    Abundance of 17 trace elements in carbonaceous chondrites. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Seventeen trace elements (Ag, Au, Bi, Br, Cd, Cs, Ge, In, Ir, Rb, Re, Sb, Se, Te, Tl, U, and Zn) were measured by neutron activation analysis in eight C1 samples (1 Alais, 3 Ivuna, 4 Orgueil and in three C2 samples (one each of Mighei, Murchison, Murray). The results show far less scatter than earlier literature data. The standard deviation of a single measurement from the mean of eight C1 samples lies between 2 and 14%, except for the following four elements: Au, Ag, Rb, and Br. The first two probably reflect contamination and sample heterogeneity, the last two, analytical error. Apparently C1 chondrites have a far more uniform composition than some authors have claimed.
    Keywords: SPACE SCIENCES
    Type: Geochimica et Cosmochimica Acta; 37; May 1973
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  • 5
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    Luna 20 soil - Abundance of 17 trace elements. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Review of the results of radiochemical neutron activation analysis of two Luna 20 fine soil and breccia samples for the abundance of 17 mainly siderophile and volatile elements that are strongly depleted in lunar surface rocks and hence represent sensitive indicators of meteoritic materials. These results are compared with those previously obtained for Apollo 16 soils. Some of the source rocks of Luna 20 regolith are identified.
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
  • 6
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    Trapped solar wind noble gases, exposure age and K/Ar-age in Apollo 11 lunar fine material (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Apollo 11 lunar fines trapped noble gas elemental and isotopic abundances, suggesting solar wind origin
    Keywords: SPACE SCIENCES
    Type: APOLLO 11 LUNAR SCIENCE CONFERENCE; Jan 05, 1970 - Jan 08, 1970; HOUSTON, TX
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    NASA TECHNICAL REPORTS
  • 7
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    Trace elements in Apollo 15 samples - Implications for meteorite influx and volatile depletion on the moon (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Five Apollo 15 soils and four rocks were examined by neutron activation analysis for 18 volatile and siderophile elements. The results obtained are initially interpreted in terms of local geologic problems at the Apollo 15 site. Implications bearing on the meteorite influx and volatile element depletion on the moon are then examined. Elbow Crater soil 15081, collected 65 m from the rim, contains a meteoritic component equivalent to 1.72% Cl material, similar to that at other lunar sites. Other soils are lower owing to dilution by fresh bedrock or talus from the Apennine Front. The moon-earth difference in volatile elements is discussed from the viewpoint of a difference in the efficiency of accretion from the solar nebula.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Jan 10, 1972 - Jan 13, 1972; Houston, TX
    Format: text
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