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  • LUNAR AND PLANETARY EXPLORATION  (2)
  • 2020-2024
  • 1980-1984  (1)
  • 1975-1979  (1)
  • 1983  (1)
  • 1979  (1)
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  • 2020-2024
  • 1980-1984  (1)
  • 1975-1979  (1)
Year
  • 1
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    Unknown
    Chemical characteristics and origin of H chondrite regolith breccias (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Petrologic data and contents of Ag, Bi, Cd, Co, Cs, Ga, In, Rb, Se, Te, Tl and Zn-trace elements spanning the volatility/mobility range-in light and dark portions of H chondrite regolith breccias and L chondrite fragmental breccias are reported. The chemical/petrologic characteristics of H chondrite regolith breccias differ from those of nonbrecciated chondrites or fragmental breccias. Petrologic characteristics and at least some trace element contents of H chondrite regolith breccias reflect primary processes; contents of the most volatile/mobile elements may reflect either primary or secondary processing, possibly within layered H chondrite parent object(s). Chemical/petrologic differences existed in different regions of the parent(s). Regoligh formation and gardening and meteoroid compaction were not so severe as to alter compositions markedly.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 47; Feb. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Trace element contents of selected antarctic meteorites, 1 (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Data are reported for volatile/mobile Ag, As, Au, Bi, Cd, Co, Cs, Cu, Ga, In, Rb, Sb, Se, Te, T1 and Zn in exterior and/or interior samples of four Antarctic meteorites: 77005 (unique achondrite); 77257 (unreilite); 77278 (L3); 77299 (H3). Exterior samples reflect contamination and/or leaching by weathering but trace element (ppm-ppt) contents in interior samples seem reasonable for representatives of these rare meteoritic types. The 77005 achondrite seems related to shergottites; other samples extend compositional ranges previously known for their types. With suitable precautions, Antarctic meteorite finds yield trace element data as reliable as those obtained from previously known falls.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-158583
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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