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  • 1975-1979  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Relations of noble gas abundances to petrogenesis and magmatic evolution of some oceanic basalts and related differentiated volcanic rocks (1979)
    Springer
    Contributions to mineralogy and petrology 69 (1979), S. 301-313 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract We report the results of noble gas analyses (Ne, Ar, Kr, and Xe) of a transitional basalt from the East Pacific Rise; a mantle xenolith, alkali basalt and trachyte from Guadalupe Island; and a basalt and icelandite from Isla Tortuga. The results for the East Pacific Rise basalt and comparison with the noble gas compositions of glassy mid-ocean ridge tholeiites indicate that the heavy noble gas patterns of these basalts can be accounted for by mixing of a juvenile reservoir with an atmosphere-related reservoir. This mixing may take place during hydration of the glassy basalts. Comparison of the noble gas compositions of these submarine basalts with those of the subaerial oceanic extrusives studied suggests that subaerial extrusives may provide noble gas samples which are less contaminated with air gases than do submarine extrusives. Our results for Guadalupe and Tortuga basalts and their differentiates provide evidence for the exsolution and loss of a gas (fluid) phase accompanying or subsequent to fractional crystallization at shallow depths. The gas loss probably took place prior to extrusion and was apparently rapid, since it did not fractionate the heavy noble gases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00372332
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    Paper (German National Licenses)
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  • 2
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    Relations of noble gas abundances to petrogenesis and magmatic evolution of some oceanic basalts and related differentiated volcanic rocks (1979)
    Springer
    Details
    Publication Date: 1979-01-01
    Print ISSN: 0010-7999
    Electronic ISSN: 1432-0967
    Topics: Geosciences
    Published by Springer
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    PAPER CURRENT
  • 3
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    Xenon component organization in 14301 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Xe in 14301 is a superposition of in situ spallation and presumably also fission Xe, of trapped solar wind, and of trapped fission Xe and Xe-129 redistributed after origin elsewhere on the moon. Some and probably most of the trapped fission originates from Pu-244. All of the components of various origins are released independently in stepwise heating, indicating that they were acquired by different means and remain in different sites within the sample. This applies to the excess fission and to the excess Xe-129, which fail to correlate quantitatively with each other; they must thus have been trapped by different mechanisms or at different times. In spite of their independent behavior in stepwise heating, the various trapped components contribute in constant proportion to the total Xe contents of the various size fractions. This quantitative correlation between excess Xe and solar wind Xe indicates that the same circumstances control the acquisition of both. The variation of the ratio of excess to solar wind Xe among different breccias thus can be ascribed more confidently to compositional variation in total Xe available for trapping rather than to the details of the trapping process.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 19, 1979 - Mar 23, 1979; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Argon ages for lunar breccias 14064 and 15405 (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 13, 1978 - Mar 17, 1978; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Excess fission xenon at Apollo 16 (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Results are reported of stepwise heating analyses of Xe and Kr in four Apollo 16 low-grade breccias: 60019, 60225, 60275, and 67455. All four samples contain significant amounts of solar wind gases and at least three contain excess fission Xe. This observation indicates that the excess fission Xe effect is global rather than local, i.e., results from moon-wide redistribution of fission Xe rather than local redistribution in KREEP-rich Apollo 14 material. It is suggested that the excess fission Xe phenomenon represents a temporal variation in the amount of fission Xe available for redistribution, that it is prominent in samples from both highland sites simply because they are older than mare sites, and that samples from these sites had experienced at least some of their surface exposure at an early epoch.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 13, 1978 - Mar 17, 1978; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
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