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  • 2010-2014  (11)
  • 1930-1934  (22)
  • 1
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    Focussed fluid flow on the Hikurangi Margin, New Zealand - Evidence from possible local upwarping of the base of gas hydrate stability (2010)
    In:  Marine Geology
    Details
    Publication Date: 2020-02-12
    Description: The southern Hikurangi Subduction Margin is characterized by significant accretion with predicted high rates of fluid expulsion. Bottom simulating reflections (BSRs) are widespread on this margin, predominantly occurring beneath thrust ridges. We present seismic data across the Porangahau Ridge on the outer accretionary wedge. The data show high-amplitude reflections above the regional BSR level. Based on polarity and reflection strength, we interpret these reflections as being caused by free gas. We propose that the presence of gas above the regional level of BSRs indicates local upwarping of the base of gas hydrate stability caused by advective heatflow from upward migrating fluids, although we cannot entirely rule out alternative processes. Simplified modelling of the increase of the thermal gradient associated with fluid flow suggests that funnelling of upward migrating fluids beneath low-permeability slope basins into the Porangahau Ridge would not lead to the pronounced thermal anomaly inferred from upwarping of the base of gas hydrate stability. Focussing of fluid flow is predicted to take place deep in the accretionary wedge and/or the underthrust sediments. Above the high-amplitude reflections, sediment reflectivity is low. A lack of lateral continuity of reflections suggests that reflectivity is lost because of a destruction of sediment layering from deformation rather than gas-hydrate-related amplitude blanking. Structural permeability from fracturing of sediments during deformation may facilitate fluid expulsion on the ridge. A gap in the BSR in the southern part of the study area may be caused by a loss of gas during fluid expulsion. We speculate that gaps in otherwise continuous BSRs that are observed beneath some thrusts on the Hikurangi Margin may be characteristic of other locations experiencing focussed fluid expulsion.
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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  • 2
    Electronic Resource
    Electronic Resource
    Lattice Distortion and Fibre Structure in Metals (1933)
    [s.l.] : Nature Publishing Group
    Nature 132 (1933), S. 352-352 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN recently published work1, I have shown that the cold-working of most metals produces, first, a stage of crystal disruption which is accompanied by growth of lattice distortion, and then, after the lattice distortion limit is reached, the second stage in which the crystallites ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/132352a0
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  • 3
    Electronic Resource
    Electronic Resource
    Anomalous X-ray Diffraction Intensities. (1931)
    [s.l.] : Nature Publishing Group
    Nature 128 (1931), S. 272-272 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The general explanation of the observations previously described under the above heading1 probably follows, as stated there, from the well-known Laue equations connecting line-breadth with the size of a crystallite measured in a direction a1. I have recently become ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/128272c0
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  • 4
    Electronic Resource
    Electronic Resource
    Anomalous X-Ray Diffraction Intensities. (1931)
    [s.l.] : Nature Publishing Group
    Nature 127 (1931), S. 703-703 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The accompanying photographs (Fig. 1) show an interesting example of a case where the relative intensities of the lines in any X-ray spectrum may vary without a corresponding change in atomic arrangement. They are Debye photographs of chromium plated wires obtained under different conditions of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/127703a0
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  • 5
    Electronic Resource
    Electronic Resource
    Ionic Exchange and Sorption of Gases by Chabazite (1933)
    [s.l.] : Nature Publishing Group
    Nature 132 (1933), S. 640-640 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN experiments on the sorption of gases by zeolites, it has been shown1 that, of seven samples of chabazite found in different localities, one showed a much smaller power of sorption than all the others. It was supposed that the cause of this peculiar behaviour of this one sample ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/132640a0
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  • 6
    Electronic Resource
    Electronic Resource
    Selective Lattice Distortion in Wires under Torsion (1933)
    [s.l.] : Nature Publishing Group
    Nature 131 (1933), S. 842-842 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] X-RAY analysis of metals affords a means of detecting the type of internal strain which is accompanied by distortion of the crystal lattice. The distortion is reflected in the X-ray diffraction photographs in that it causes a broadening of the spectrum lines; the effect has been noted for ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/131842b0
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  • 7
    Electronic Resource
    Electronic Resource
    Crystal Lattice Distortion in Stretched Wire (1932)
    [s.l.] : Nature Publishing Group
    Nature 129 (1932), S. 760-761 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE process of cold-rolling or drawing certain metals is known to produce a permanent irregular departure from the normal atomic structure of the grains. I find that this type of lattice distortion occurs also in wires of constantan which have been stretched longitudinally by gradual loading. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/129760b0
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  • 8
    Electronic Resource
    Electronic Resource
    Distortion of the Crystal Lattice of α-Brass (1934)
    [s.l.] : Nature Publishing Group
    Nature 134 (1934), S. 572-572 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WHEN a metal is cold-worked, its X-ray spectrum is modified. In most cases, this modification includes a diffusion of the diffraction lines. If the diffused lines are photographed in an X-ray camera giving high dispersion, and analysed with the aid of a rnicrophotometer, it is found that, in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/134572a0
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  • 9
    Electronic Resource
    Electronic Resource
    Silicon Transformer Steel Residue. (1930)
    [s.l.] : Nature Publishing Group
    Nature 125 (1930), S. 974-974 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN his book “Applied X-Rays” Dr. G. L. Clark publishes some very interesting photographs showing the connexion between the magnetic hysteresis loss and the grain size of 4 per cent silicon steels. He takes the grain size to be inversely proportional to the number of spots produced under given ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/125974a0
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  • 10
    Electronic Resource
    Electronic Resource
    Atomic Physics and Related Subjects.: Communications to Nature .: Behaviour of Electrons in a Gas Tube. (1930)
    [s.l.] : Nature Publishing Group
    Nature 125 (1930), S. 457-458 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE late Mr. Campbell Swinton observed (Proc. Roy. Soc., 61, 79; 1897) that a carbon anticathode in a gas X-ray tube under certain conditions showed a ring of fluorescence which he considered due to the hollow nature of the cathode stream. The following preliminary account of some ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/125457b0
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