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  • 1
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    Redox stratification of an ancient lake in Gale crater, Mars (2017)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2017-06-02
    Description: In 2012, NASA’s Curiosity rover landed on Mars to assess its potential as a habitat for past life and investigate the paleoclimate record preserved by sedimentary rocks inside the ~150-kilometer-diameter Gale impact crater. Geological reconstructions from Curiosity rover data have revealed an ancient, habitable lake environment fed by rivers draining into the crater. We synthesize geochemical and mineralogical data from lake-bed mudstones collected during the first 1300 martian solar days of rover operations in Gale. We present evidence for lake redox stratification, established by depth-dependent variations in atmospheric oxidant and dissolved-solute concentrations. Paleoclimate proxy data indicate that a transition from colder to warmer climate conditions is preserved in the stratigraphy. Finally, a late phase of geochemical modification by saline fluids is recognized.
    Keywords: Geochemistry, Geophysics, Online Only, Planetary Science
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 2
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    On the siting of gases shock-emplaced from internal cavities in basalt (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Laboratory experiments were carried out on shock-emplaced gases from Servilleta basalt samples that contained gas-filled cavities to answer the following questions: (1) what is the role of shock melting in trapping gases; (2) how are the glassy pockets that contain trapped gases formed; and (3) are the gases trapped in laboratory shocked basalts sited similarly to, and emplaced with the same efficiency as, the gases in the EETA 79001 shergottite? Noble gases were extracted by stepped combustion and crushing followed by shock at 40 GPa, and were analyzed for abundances. Results obtained indicate that noble gases trapped from internal cavities of shock-exposed basalt are associated with glass and are sited predominantly in microvesicles, with a significant fraction of the gases released by crushing. The presence of gas-filled cavities prior to shock results in substantially greater shock effects locally. Thus, glassy pockets similar to those seen in EETA 79001 can be produced in situ within a matrix shocked to only moderate pressures. However, the siting of the gases points to a more complex scenario.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 52; 2775-278
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Noble gases released by vacuum crushing of EETA 79001 glass (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: An EETA 79001 glass sample was crushed in a vacuum to observe the gases released. About 15 pct of the total gas concentrations were a mixture of a small amount of SPB-type gas with larger proportions of another air-like component. Less than 5 pct of the SPB gas was released by crushing, while 36-40 pct of the EETV (indigenous) gas was crush-released. The results are consistent with a siting of the EETV component in 10-100 micron vesicles seen in the glass. It is suggested that the SPB component is either in vesicles less than 6 microns in diameter or is primarily sited elsewhere.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters (ISSN 0012-821X); 91; 1-2
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The case for a Martian origin of the shergottites. II - Trapped and indigenous gas components in EETA 79001 glass (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The isotopic composition of N, Ar, Ne, and He, trapped in an uncrushed sample of the antarctic shergottite EETA 79001, was analyzed by subjecting the evacuated sample to stepped heating in the presence of 100 mtorr of oxygen. The isotopic composition of nitrogen (with the delta-N-15 value of greater than 300 percent) and the elemental ratios Ar-36/N-14 and Ar-40/N-14 were covariant along mixing lines passing through the Martian atmospheric composition. The results of this and previous analyses are consistent with a two-component nitrogen system in which about 84 ppb of trapped Martian atmospheric N is mixed in variable proportions with another, more thermally labile N component during stepped heating. The isotopic Ar-36/Ar-38 ratio of the EETA 79001 is different from that of the earth atmosphere by about 25 percent.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters (ISSN 0012-821X); 77; 2 Ma
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    ChemCam Investigation of the Last Four MSL Drill Sites in the Murray Formation, Gale Crater, Mars (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This study utilizes ChemCam data for outcrop surfaces, drill hole walls, tailings, and dump piles in the Middle Murray Formation to investigate chemical variations with depth in the drill holes and pos-sible effects of the drilling and sample processing. This work is a continuation of similar work on drill sites at Yellowknife Bay [1], the Pahrump Hills [2], and the Stimson Formation [3].
    Keywords: General
    Type: JSC-E-DAA-TN53595 , Lunar and Planetary Science Conference; Mar 19, 2018 - Mar 23, 2018; Woodlands, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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