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  • 1995-1999
  • 1990-1994
  • 1980-1984  (9)
  • 1955-1959
  • 1983  (9)
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  • 1995-1999
  • 1990-1994
  • 1980-1984  (9)
  • 1955-1959
Year
  • 1
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    Influence of the Mediterranean Outflow on the isotopic composition of neodymium in waters of the North Atlantic (1983)
    American Geophysical Union
    Details
    Publication Date: 1983-01-01
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 2
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    Eruption age of a Pleistocene basalt from40Ar−39Ar analysis of partially degassed xenoliths (1983)
    American Geophysical Union
    Details
    Publication Date: 1983-06-10
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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    PAPER CURRENT
  • 3
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    Eruption age of a Pleistocene basalt from Ar-40-Ar-39 analysis of partially degassed xenoliths (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; June 10
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Ar-39 recoil losses and presolar ages in Allende inclusions (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Argon analyses were performed for five coarse-grained, Ca-Al-rich inclusions from the Allende meteorite. The samples were neutron-irradiated in evacuated ampuoles, and the Ar in the ampuoles and in the samples was analyzed. Up to 60 percent of Ar-39 was lost from the samples into the ampuoles due to recoil during neutron-irradiation; this loss resulted in substantial increases in the apparent Ar-40-Ar-39 ages of the samples. Substantial amounts of trapped Ar-36 of unknown origin were found in the inclusions, and the presence of trapped Ar-40 could not be ruled out. It is inferred that the interpretation of high Ar-40/K-40 ratios as very high (presolar) ages may be subject to question. It is noted that the degrees of Ar-39 recoil loss reported is comparable to recoil loss in terrestrial rocks and cannot be attributed to KCl contamination of the samples.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters (ISSN 0012-821X); 63; 1 Ap; April 19
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Replacement textures in CAI and implications regarding planetary metamorphism (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Formation by a secondary metamorphic event, rather than primary crystallization from a melt or a sequential nebular condensation, is indicated by textural and chemical features of five coarse grained, Ca- and Al-rich inclusions (CAI) from the Allende meteorite which contain embayed pyroxene surrounded by melilite. It is suggested that the most probable environment for a metamorphic process (requiring the addition of Ca derived from calcite or from the introduction of a fluid phase) is that of a small planetary body, rather than the solar nebula. These results are compatible with O isotopic heterogeneities within CAI, and offer a mechanism for the production of lower temperature alteration phases, together with the rim phases found in these inclusions.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 47; April 19
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Influence of the Mediterranean outflow on the isotopic composition of neodymium in waters of the North Atlantic (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Measurements of the Nd-143/Nd-144 ratio, expressed as epsilon-Nd(0), made in sea water samples obtained at depths from 0 to 4850 m at stations 95, 101, and 30 of North-Atlantic cruise 109-1 of the RV Atlantis II are reported and analyzed. In the 1000-m sample at station 95, determined by salinity, O2, PO4, NO3, SiO2, potential-temperature, and pressure profiles to correspond to the core of the Mediterranean outflow, an epsilon-Nd(0) value of -9.8 + or - 0.6 was found, a significant increase over the layers above and below, where epsilon-Nd(0) is about -12. Mixing estimations give a value for pure Mediterranean waters of approximately -6; continental drainage or volcanic deep-sea sediments are considered possible sources for this more radiogenic Nd. The epsilon-Nd(0) peak in the western North Atlantic (station 30) is found at the surface, and the deep waters are less radiogenic than in the eastern North Atlantic, suggesting multiple Nd sources. Possible origins and distribution mechanisms are discussed.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; July 20
    Format: text
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  • 7
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    The isotopic composition and concentration of Ag in iron meteorites and the origin of exotic silver (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The isotopic composition of Ag and the concentration of Ag and Pd in Canyon Diablo (IA), Grant (IIIB), Santa Clara, Tlacotepec and Warburton Range (IVB), Pinon and Deep Springs (anom) were analyzed. Troilite from Santa Clara and from Grant was also studied. With the exception of IA, all the meteorites were enriched in Ag-107 by about 2%-212% and the ratio of Ag-107/Ag-109 in the metal phase was found to be greater than the terrestrial value. Ag of anomalous isotopic composition was found to be common in all IVB and anomalous meteorites. A correlation of Ag-107/Ag-109 with Pd/Ag was established except for the iron meteorite of Santa Clara. The excess Ag-107 is thought to result from the decay of Pd-107. The Grant data appear to represent a Pd-107-Ag-107 isochron and indicate that the cooling rate at elevated temperatures was rapid enough to preserve the isotopic differences between metal and troilite. The data suggest that Ag in Santa Clara is made up of almost pure Ag-107 produced from Pd-107 decay and Ag-109 produced by nuclear reactions with only a small amount of 'normal' Ag. This indicates an intense energetic particle bombardment history in the early solar system which occurred after the formation of small planetary bodies.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 47; Jan. 198
    Format: text
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  • 8
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    Chemical and isotopic study of extraterrestrial particles from the ocean floor (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An Rb-Sr isotopic analysis of deep-sea spherules (DSS) from the Pacific, vesicular iridium-rich glassy objects (VIRGO) from an Antarctic-Ocean diatomaceous-ooze core, and equigranular objects (EGO) associated with or included in VIRGO, is reported. The techniques of sample collection, preparation, chemical analysis, and isotopic analysis (by mass spectrometry) are described in detail, and the results are presented in tables. The Sr-87/Sr-86 determination has a precision of 1-2 percent in microsamples of 2-8 x 10 to the 11th Sr atoms. The DSS are found to have Sr concentrations and Sr-87/Sr-86 (0.730-0.757) typical of chondritic meteorites. Extreme Rb depletion is attributed to volatization during meteoroid atmospheric heating. The VIRGO, while having major-element compositions like that of meteorites and high Ir levels suggesting extraterrestrial origin, have Sr-87/Sr-86 = 0.703-0.705; and the associated EGO has Sr-87/Sr-86 = 0.701 + or - 0.001, typical of MORB or basaltic achondrites. Hence their extraterrestrial origin is not proved, and some lithic component other than the EGO must be the source of the high Ir concentration.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters (ISSN 0012-821X); 64; 3 Se; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    The isotopic composition of silver and lead in two iron meteorites - Cape York and Grant (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Anomalies in silver isotope composition in the metal phases of the Cape York (IIIA) and Grant (IIIB) iron meteorites are studied together with the lead isotopic composition of both the metal and sulfide phases of Cape York. Following extensive surface cleaning, the Ag-107/Ag-109 ratio in the metal phases of the meteorites is found to be in excess of the terrestrial ratio, and of that found in the sulfide phases. A definite correlation between the Ag-107/Ag-109 and Pd-108/Ag-109 ratios is observed for these meteorites, indicating the in situ decay of Pd-107 and supporting the widespread presence of Pd in the early universe. Lead, determined after cleaning and with chemical separations using low blank levels, is found to exist in variable proportions in the metal and sulfide phases. The sulfides appear to be dominated by radiogenic modern lead, which may be explained by terrestrial contamination or by late metamorphism in the meteorite parent body.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 47; 1725-173
    Format: text
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