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  • 1
    Electronic Resource
    Electronic Resource
    Kinetic processes and thermal history of slowly cooling solids (1976)
    [s.l.] : Nature Publishing Group
    Nature 259 (1976), S. 551-553 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Closure temperature1 is defined in Fig. 1. Curve I represents the equilibrium value of some chemical parameter x, and curve II its kinetically-controlled value. At high temperatures the two curves coincide. When the temperature decreases sufficiently the kinetically-controlled value beings to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/259551a0
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  • 2
    Electronic Resource
    Electronic Resource
    Age differences between Archaean cratons of eastern and southern Africa (1975)
    [s.l.] : Nature Publishing Group
    Nature 254 (1975), S. 315-318 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In Table 1 the stratigraphy of the greenstone belts of the Tanzanian Craton (see Fig. 1) is compared with those of the Rhodesian and Kaapvaal cratons. The Kavirondian and Nyanzian systems, confined to the northern part of the Tanzanian Craton, are particularly well exposed near theTanzanian-Kenya ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/254315a0
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  • 3
    Electronic Resource
    Electronic Resource
    Potassium–Argon Dates and the Origin of Wealden Glauconites (1964)
    [s.l.] : Nature Publishing Group
    Nature 202 (1964), S. 585-586 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Wealden laminae rich in ? detrital grains of glauconite (black dots). Scoop No. 2, top Lower Tunbridge Wells sandstone, Philpots Quarry, West Hoathly, Sussex (ref. 19) Associated detrital grains2, pebbles3'4 and clays5 suggest Upper Kimeridge-Lower Portland (that is, Lower Volgian) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/202585b0
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  • 4
    Electronic Resource
    Electronic Resource
    Caledonian Magmatism in North Wales (1966)
    [s.l.] : Nature Publishing Group
    Nature 209 (1966), S. 866-868 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN a survey of the British Caledonides, Read1 emphasized the need for more information, on the many aspects of Caledonian magmatism in Britain. He briefly discussed the few available isotopic ages for the Caledonian granites of the 'metamorphic' and 'non-metamorphic' belts, but pointed out that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/209866a0
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  • 5
    Electronic Resource
    Electronic Resource
    Age of Lundy Granite, Bristol Channel (1962)
    [s.l.] : Nature Publishing Group
    Nature 195 (1962), S. 975-976 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE granites which form the greater part of Lundy, a small island in the Bristol Channel, have generally been regarded as either Hercynian or Tertiary in age. A Hercynian age, that is, 270-300 m.y., would be expected from the geographical location of Lundy near known Hercynian granites of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/195975a0
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  • 6
    Electronic Resource
    Electronic Resource
    Potassium–Argon Ages of the Dartmoor and Shap Granites using the Total Volume and Isotopic Dilution Techniques of Argon Measurement (1961)
    [s.l.] : Nature Publishing Group
    Nature 190 (1961), S. 800-802 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In this communication the results of new potassium-argon measurements on the Shap and Dartmoor granites, using both total volume and isotopic dilution techniques, are reported. The total volume measurements were carried out at Cambridge on newly developed apparatus, and at Oxford on the apparatus ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/190800b0
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  • 7
    Electronic Resource
    Electronic Resource
    UK science teaching (1988)
    [s.l.] : Nature Publishing Group
    Nature 333 (1988), S. 9-9 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-Science teachers in Britain are being pressed to introduce changes that pose a serious threat to standards, especially for pupils of high academic ability. I refer to what is variously called "integrated science", "balanced science", or simply "science". The changes have apparently been ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/333009e0
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  • 8
    Electronic Resource
    Electronic Resource
    Isotopic Ages of the Weardale Granite (1961)
    [s.l.] : Nature Publishing Group
    Nature 190 (1961), S. 900-900 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Isotopic dilution techniques were employed for the determination of rubidium, strontium and argon. A flame photometric method was employed to determine potassium. The results for the rubidium-strontium method are given in Table 1, and those for the potassium-argon method in Table 2. Table 1. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/190900a0
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  • 9
    Electronic Resource
    Electronic Resource
    Isenthalpic Flow, Joule–Kelvin Coefficients and Mantle Convection (1971)
    [s.l.] : Nature Publishing Group
    Nature 234 (1971), S. 212-212 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] This argument is incorrect. Waldbaum has apparently been misled by variations in the published definitions of enthalpy. Although the enthalpy of a substance is always defined by an expression of the form h = u+pv (1) (h = specific enthalpy, u? specific internal energy, p= pressure and v = ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/234212a0
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  • 10
    Electronic Resource
    Electronic Resource
    Radiometric constraints on hydrothermal circulation in cooling granite plutons (1995)
    Springer
    Mineralium deposita 30 (1995), S. 460-468 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Improved precision of radiometric dating of ore deposits can provide information about the thermal history of hydrothermal circulation in cooling plutons. In Jales a Hercynian porphyritic two-mica granite and pre-Ordovician mica schists are cut and intensely altered by the Campo gold-quartz vein. The unaltered granite must be younger than 320 ± 6 Ma, and gives mica Rb-Sr ages of 308.5 ± 2.4 (1σ) Ma (muscovite) and 294.5 ± 1.1 Ma (biotite). Alteration muscovites from the granite give a weighted mean Rb-Sr age of 308.1 ± 1.5 Ma, and a mean 39Ar-40Ar age of 300.7 ± 2.8 Ma. Alteration muscovites from the mica schists give similar 39Ar-40Ar ages, averaging 303.0 ± 2.8 Ma. The results suggest that circulation of the Campo mineralising fluids took place no more than 2–4 Ma after the granite cooled through the muscovite Rb-Sr closure temperature, about 500 °C, and that subsequent cooling to biotite closure at about 300 °C took place at less than 14°C/Ma. The mean cooling rate following emplacement was 15 to 25 °C/Ma. The most detailed comparable published data, for the Cornubian ore field, imply much faster cooling rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196405
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