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  • 1
    Electronic Resource
    Electronic Resource
    Palaeogeotherms: implications of disequilibrium in garnet Iherzolite xenoliths (reply) (1978)
    [s.l.] : Nature Publishing Group
    Nature 276 (1978), S. 737-738 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FRASER AND LAWLESS reply-We completely agree1 with Carswell that the similarity between the temperature dependence of the garnet-orthopyroxene geobarometer2 and likely geothermal gradients makes it difficult to use this reaction to distinguish between the effects of differences in blocking ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/276737b0
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  • 2
    Electronic Resource
    Electronic Resource
    Palaeogeotherms: implications of disequilibrium in garnet lherzolite xenoliths (1978)
    [s.l.] : Nature Publishing Group
    Nature 273 (1978), S. 220-222 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Equilibrium temperatures and pressures have been calculated for suites of garnet Iherzolite nodules, from the Bultfontein (P. J. Lawless, unpublished) and Premier (R. V. Danchin, unpublished) mines in South Africa (Fig. 1). Nodules from other localities in Southern Africa lie on similar ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/273220a0
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  • 3
    Electronic Resource
    Electronic Resource
    Palaeogeothermal gradients derived from xenoliths in kimberlite (1975)
    [s.l.] : Nature Publishing Group
    Nature 257 (1975), S. 299-300 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Accordingly, it has been proposed1-3 that the perturbation of the normal subcratonic gradient was caused by stress heating at the base of the African Plate during the breakup of Gondwanaland in the Cretaceous, with the 150 km inflection point on the gradient being the top of the sheared, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/257299a0
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  • 4
    Electronic Resource
    Electronic Resource
    Diamondiferous garnet harzburgites from the Finsch kimberlite, Northern Cape, South Africa (1992)
    Springer
    Contributions to mineralogy and petrology 110 (1992), S. 133-138 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Two xenoliths of garnet harzburgite from the Finsch kimberlite, South Africa, have been found to contain diamond. One of the xenoliths has mineral compositions typical of low-T coarse textured garned peridotites, whereas minerals in the other are similar but not identical to most peridotite-suite minerals included in diamonds, especially in the low-CaO content of garnet. Geothermobarometric calculations show both xenoliths equilibrated at temperatures above 1,100°C and pressures〉55 kbar, which is near the low-pressure end of the range of equilibration conditions for diamond-free garnet lherzolites and garnet harzburgites from Finsch. The chemistries of the minerals in the two rocks are distinctly different to most of the mineral inclusions in Finsch diamonds. This, as well as the different δ13C compositions between xenolith diamonds (-2.8 to-4.6‰) and diamonds in the kimberlite (generally〈-4.3‰) suggest different origins or sources for the diamonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310887
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