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  • Other Sources  (3)
  • ASTROPHYSICS  (3)
  • Chemistry
  • F10
  • 1990-1994  (3)
  • 1980-1984
  • 1994  (3)
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  • 1990-1994  (3)
  • 1980-1984
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  • 1
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    Distribution of siderophile and other trace elements in melt rock at the Chicxulub impact structure (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Recent isotopic and mineralogical studies have demonstrated a temporal and chemical link between the Chicxulub multiring impact basin and ejecta at the Cretaceous-Tertiary boundary. A fundamental problem yet to be resolved, however, is identification of the projectile responsible for this cataclysmic event. Drill core samples of impact melt rock from the Chichxulub structure contain Ir and Os abundances and Re-Os isotopic ratios indicating the presence of up to approx. 3 percent meteoritic material. We have used a technique involving microdrilling and high sensitivity instrumental neutron activation analysis (INAA) in conjunction with electron microprobe analysis to characterize further the distribution of siderophile and other trace elements among phases within the C1-N10 melt rock.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., The Twenty-Fifth Lunar and Planetary Science Conference. Part 3: P-Z; p 1221-1222
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Mn-Cr isotopic systematics of Chainpur chondrules and bulk ordinary chondrites (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: We report on ongoing study of the Mn-Cr systematics of individual Chainpur (LL3.4) chondrules and compare the results to those for bulk ordinary chondrites. Twenty-eight chondrules were surveyed for abundances of Mn, Cr, Na, Fe, Sc, Hf, Ir, and Zn by INAA. Twelve were chosen for SEM/EDX and high-precision Cr-isotopic studies on the basis of LL-chondrite-normalized Mn(LL), Sc(LL), (Mn/Fe)(LL), and (Sc/Fe)(LL) as well as their Mn/Cr ratios. Classification into textural types follows from SEM/EDX examination of interior surfaces.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Papers Presented to the Conference on Chondrules and the Protoplanetary Disk; p 28-30
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The parent magma of xenoliths in shergottite EETA79001: Bulk and trace element composition inferred from magmatic inclusions (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The SNC meteorites are samples of the Martian crust, so inferences about their origins and parent magmas are of wide planetologic significance. The EETA79001 shergottite, a basalt, contains xenoliths of pyroxene-olivine cumulate rocks which are possibly related to the ALHA77005 and LEW88516 SNC lherzolites. Olivines in the xenoliths contain magmatic inclusions, relics of magma trapped within the growing crystals. The magmatic inclusions allow a parent magma composition to be retrieved; it is similar to the composition reconstructed from xenolith pyroxenes by element distribution coefficients. The xenolith parent magma is similar but not identical to parent magmas for the shergottite lherzolites.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., The Twenty-Fifth Lunar and Planetary Science Conference. Part 3: P-Z; p 1417-1418
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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