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  • 1
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    APXS on Mars: Analyses of Soils and Rocks at Gusev Crater and Meridiani Planum (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-11
    Description: Newly developed APXS (Alpha Particle X-Ray Spectrometers) are part of the Athena payload of the Mars Exploration Rovers Spirit and Opportunity [1]. The APXS determines the chemical composition of soils and rocks along the traverse of the two rovers. Spirit and Opportunity operate at Gusev Crater and Meridiani Planum, respectively. First results of soil X-ray spectra at both landing sites support the hypothesis of a global homogenization of the soil by large dust storms and impact processes in the northern and southern hemisphere.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXV: Mars Missions; LPI-Contrib-1197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Cr Isotope Systematics in the Pallasite Eagle Station: Chronology and Evidence for a Genetic Link to Carbonaceous Chondrites (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The study of the Mn-53-Cr-53 system in the pallasite Eagle Station has shown that it formed 4557.5 +/- 0.6 Ma ago. The Cr isotopic signature is different from that of the main group pallasites and suggests a genetic link to CV3 chondrites. Additional information is contained in the original extended abstract.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXII; LPI-Contrib-1080
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    NASA TECHNICAL REPORTS
  • 3
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    Isotopic, Chemical and Mineralogical Investigation's of Extraterrestrial Materials (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: During the grant period we have concentrated on the following main topics: 1. Enstatite meteorites and original heterogeneity of Mn-53 distribution in the solar nebula. We have completed our studies of the enstatite chondrites. 2. Processes of planetary differentiation. We have completed our study of silicate clasts from the mesosiderite Vaca Muerta and found that the global Mn/Cr fractionation event that established mantle source reservoirs on the parent body of the Vaca Muerta silicate clasts occurred approx. 2 Ma after a similar event on the howardite-eucrite-diogenite (HED) parent body. 3. Carbonaceous chondrites. Much effort has been devoted during the last three years to the investigation of this important class of meteorites. 4. Early solar system timescales. Based on the studies of the Mn-53 - Cr-53 isotope system in various meteorites and using results obtained with other isotope chronometers we constructed an absolute time-scale for events in the early solar system. 5.Unusual meteorites. We have studied the anomalous pallasite Eagle Station. 6. The chromium isotopic composition as a tracer for extraterrestrial material on Earth. Based on the observed difference in the Cr-53/Cr-52 ratios between Earth and the other solar system objects we developed a method for detecting cosmic materials on Earth using the Cr-53/Cr-52 ratio as a tracer.
    Keywords: Lunar and Planetary Science and Exploration
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    NASA TECHNICAL REPORTS
  • 4
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    Manganese-Chromium Isotope Systematics of Ivuna, Kainsaz and Other Carbonaceous Chondrites (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: We have shown earlier that the bulk samples of carbonaceous chondrites [CC] reveal excesses in both Cr-53 (Cr-53*) and Cr-54 (Cr-54*) as compared to the terrestrial standard value. The Cr-53/52 ratios in bulk samples of Orgueil (CI), Murray (CM), Allende (CV), and the Bencubbin/CH-like meteorite Hammadah Al Hambra 237 (HH237) are correlated with the respective Mn/Cr ratios. In contrast to CC, HH237 is characterized by a deficit of Cr-53 (-0.15 +/- 0.10(epsilon)) at a low Mn/Cr ratio of 0.07. The HH237 data point, however, falls on the CC line. Here we report new Mn-53 - Cr-53 results for the CC Kainsaz (CO) and Ivuna (CI).
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXIV; LPI-Contrib-1156
    Format: text
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    NASA TECHNICAL REPORTS
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