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  • LUNAR AND PLANETARY EXPLORATION  (11)
  • 1
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    Martian carbon dioxide: Clues from isotopes in SNC meteorites (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Attempts to unravel the origin and evolution of the atmosphere and hydrosphere on Mars from isotopic data have been hampered by the impreciseness of the measurements made by the Viking Lander and by Earth-based telescopes. The SNC meteorites which are possibly pieces of the Martian surface offer a unique opportunity to obtain more precise estimates of the planet's volatile inventory and isotopic composition. Recently, we reported results on oxygen isotopes of water extracted by pyrolysis from samples of Shergotty, Zagami, Nakhla, Chassigny, Lafayette, and EETA-79001. Now we describe complementary results on the stable isotopic composition of carbon dioxide extracted simultaneously from those same samples. We will also report on C-14 abundances obtained by accelerator mass spectrometry (AMS) for some of these CO2 samples.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M; p 757-758
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  • 2
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    Age of Allan Hills 82102, a meteorite found inside the ice (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The terrestrial age of a meteorite that was recovered from below the surface of Antarctic ice is reported, and it is argued that this represents a measurement of the age of the ice itself. The cosmogenic radionuclides Be-10, C-14, Al-26, Cl-36, and Mn-53 are measured in the meteorite and Be-10 and Cl-36 in the ice. A terrestrial age of 11,000 yr is obtained for the meteorite, which suggests that the snow accumulation area where it fell was only a few tens of km away.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature (ISSN 0028-0836); 340; 550-552
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  • 3
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    Carbon-14 ages of Antarctic meteorites with accelerator and small-volume counting techniques (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: C-14 measurements were made on six Yamato and Victoria Land meteorites using tandem accelerator mass spectroscopy. The studies brought to 27 the number of Antarctic meteorites that have been examined for terrestrial aging. Details of the spectroscopic method are provided, along with the results in combinations with the data from the other 21 meteorites. It is found that the Yamato meteorites are younger than those found at Allan Hills, implying that two mechanisms may exist for the abundant Antarctic meteorites: exposure where falling due to a paucity of ice, and transport and exposure by sublimating ice.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research, Supplement (ISSN 0148-0227); 89; C329-C33
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  • 4
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    A carbon-14 depth profile in the L5 chondrite Knyahinya (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We report on a series of measurements of C-14 in samples of the L-chondrite Knyahinya, as a function of depth. The results show C-14 concentrations ranging from 37 to 58 dpm/kg. These measurements are compared to the levels of Ne-21, Be-10 and noble-gas ratios in this meteorite reported by Graf et al (1990). We also compare the C-14 data to the expected profile based on two sets of model calculations. The behavior of this radioisotope with depth is similar to that expected from the models, and good agreement with the profiles of other nuclides is also observed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics (ISSN 0026-1114); 29; 5; p. 649-651
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  • 5
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    The exposure history of the Apollo 16 sites. An assessment based on methane and carbide measurements (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Soils from eight stations at the Apollo 16 landing site have been analyzed for methane and carbide. These results, in conjunction with published data from photogeology, bulk chemistry, rare gases, primordial and radionuclides, and agglutinate abundances have been interpreted in terms of differing contributions from three components, North and South Ray crater ejecta and Cayley Plains material.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-141249 , REPT-234 , Soviet-Am. Conf. on the Cosmochem. of the Moon and Planets,; Jun 04, 1974 - Jun 08, 1974; Moscow; Soviet Union
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  • 6
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    Carbon-14 activities in recently fallen meteorites and Antarctic meteorites (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This paper reports C-14 measurements in meteorites using an extraction method which employs RF melting of samples as small as 0.1 g. A study of extraction of cosmic-ray-produced C-14 in samples of Bruderheim gave C-14 levels between 38 and 60 dpm/kg for samples which had been preheated in air between 250 and 700 C, with a mean value of 46.8 + or - 1.4 dpm/kg. A range of values between 35 and 59 dpm/kg was found for other falls of saturated meteorites preheated to 500 C. The preheating step is shown to be effective in removing terrestrial carbon contamination. A series of samples previously dated by Kr-81 as having ages of 120-310 kyr gave C-14 levels of between less than 0.16 and 0.37 + or - 0.10 dpm/kg. These levels are consistent with levels of in situ production by cosmic rays at the earth's surface.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 53; 2095-210
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  • 7
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    Rapid growth of magnesium-carbonate weathering products in a stony meteorite from Antarctica (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Nesquehonite, a hydrous magnesium carbonate, occurs as a weathering product on the surface of the Antarctic meteorite LEW 85320 (H5 chondrite). Isotopic measurements of delta(C-13) and delta(O-18) indicate that the nesquehonite formed at near freezing temperatures by reaction of meteoritic minerals with terrestrial water and carbon dioxide. Results from carbon-14 dating suggest that, although the meteorite has been in Antarctica for at least 32,000 to 33,000 years, the nesquehonite formed after AD 1950.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science (ISSN 0036-8075); 242; 417-419
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  • 8
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    Carbon-14 terrestrial ages and weathering of 27 meteorites from the southern high plains and adjacent areas (USA) (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: We report on a series of 27 C-14 terrestrial ages of meteorites from four states in the central and southwestern U.S. These results were compared to the earlier work of Boeckl (1972). Our results showed that the weathering rate for destruction of meteorites is lower than suggested by Boeckl. We estimate a 'half-life' for removal of meteorites of about 10 to 15 ka, similar to that derived for Roosevelt County meteorites. We also studied the weathering of these meteorites compared to terrestrial age. Only a weak correlation was observed, and for these meteorites the degree of weathering can only be taken as a weak indicator of terrestrial residence time. We also measured the delta-C-13 and C-14 and amount of weathering-product carbonates which show some interesting variations with the length of time the meteorites have been exposed to weathering.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics (ISSN 0026-1114); 28; 2; p. 188-195.
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  • 9
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    The natural thermoluminescence of meteorites. VI - Carbon-14, thermoluminescence and the terrestrial ages of meteorites (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A relationship is noted between the natural thermoluminescence (TL) levels and the C-14-derived terrestrial ages for meteorite finds from the U.S. Prairie States and Roosevelt County, NM; those in the Sahara are also in accord with calculated TL decay curves, for 'storage' temperatures equal to the approximate average annual temperatures at individual sites. This discussion is limited to the empirical correspondence between the two methodologies, and to theoretical decay curves for a single 'average' ordinary chondrite.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics (ISSN 0026-1114); 28; 2; p. 196-203.
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  • 10
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    On the Bur Gheluai H5 chondrite and other meteorites with complex exposure histories (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Isotopic concentrations and track densities measured in 13 samples of the Bur Gheluai meteorite fall are presented. Experimental methods are described and results are presented for isotopic ratios of noble gases and cosmogenic radionuclide contents. Evidence for complex irradiation is discussed and a model for two-stage exposure histories is presented. The duration of each irradiation stage and possible effects on isotope production rates are considered. Explanations are suggested for the discrepant Ne production rates.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics (ISSN 0026-1114); 28; 1; p. 71-85.
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