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  • 1980-1984  (3)
  • 1
    Electronic Resource
    Electronic Resource
    K, U and Th in mid-ocean ridge basalt glasses and heat production, K/U and K/Rb in the mantle (1983)
    [s.l.] : Nature Publishing Group
    Nature 306 (1983), S. 431-436 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Analyses on fresh glass samples of mid-ocean ridge basalt yield a uniform ratio K/U = 12,700 ± 200. In contrast, Th/U increases systematically with Th concentration. From these results we calculate an upper limit (1.5 pW kg−1) and a best estimate (0.6 pW ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/306431a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Sr and Nd isotope geochemistry of oceanic basalts and mantle evolution (1982)
    [s.l.] : Nature Publishing Group
    Nature 296 (1982), S. 821-825 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sr and Nd isotope ratios are reported for 17 mid-ocean ridge basalts and for 11 oceanic islands and island groups. Data from the Azores, Samoa and the Society Islands diverge significantly from the mantle array. These results are not explained by binary mixing of depleted and undepleted mantle ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/296821a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Case studies on the origin of basalt (1983)
    Springer
    Contributions to mineralogy and petrology 84 (1983), S. 382-389 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract This paper presents a method for the systematic trace element modelling of a cogenetic suite of lavas. It is based on the geochemical inversion technique of Allègre and coworkers and utilizes the variations in the trace element concentrations of the lavas to calculate initial concentrations and source mineralogy. We reduce this inversion to a simple, step-by-step procedure: (1) correcting for fractional crystallization; (2) testing the inferred primary melt compositions for consistency with a model of equilibrium partial melts (with constant partition coefficients) formed from identical sources; (3) estimating the proportions of mineral phases entering the melt; (4) computing concentrations and bulk partition coefficients in the initial source relative to the concentration of a common reference element; (5) estimating relative mineral abundances in the source. Except for the fractionation correction, the calculations are done element by element using a direct analytic solution. For the purpose of comparison we apply this method to the same set of data used by Minster and Allègre (1978), a suite of lavas from Grenada (lesser Antilles) originally analyzed by Shimizu and Arculus (1975). The results of both methods agree well for the source abundances of the light REE, whereas the heavy REE abundances are shown to be poorly constrained by the data. Both methods require residual clinopyroxene and garnet in the source, but the ratio of these minerals is not well constrained. We are unable to reproduce the shape of D0 pattern (=bulk partition coefficients of the initial source) given by Minster and Allègre. The reason for this cannot be evaluated without repeating their calculations in detail. The set of data from Grenada is useful for comparison of the methods only, because it is now known from isotopic data that the samples are not truly cogenetic. Possibly better suited sets of samples for petrogenetic modelling are presented in parts II and III of this series.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160289
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    Paper (German National Licenses)
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