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  • Springer  (4)
  • Nature Publishing Group
  • 1965-1969  (4)
Document type
Publisher
  • Springer  (4)
  • Nature Publishing Group
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Magnetic anisotropy of laboratory materials in which magma flow is simulated (1966)
    Springer
    Pure and applied geophysics 64 (1966), S. 78-80 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The magnetic anisotropy of lava flows has been simulated using plaster of Paris containing about 2% of nickel filings. The ellipsoid of magnetic anisotropy was oriented with its long axis close to but tilted with respect to the flow direction and its intermediate axis in the flow plane perpendicular to the flow direction; the same alignment was obtained with four different experimental conditions. This result is at variance with observations on basalt flows in which the long axis of the magnetic ellipsoid is perpendicular to the flow direction. It appears likely that the favoured alignment of elongated grains in a fluid or semi-fluid flow is sensitive to physical parameters which have not yet been examined adequately. Reliable magnetic determinations of flow directions in lavas must await clarification of this problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875533
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The volcano-magnetic effect (1965)
    Springer
    Pure and applied geophysics 62 (1965), S. 96-104 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary A geometrically simple volcano is considered, havig a spherical magma chamber of 2.5 km radius centred at 10 km depth. The Curie point isotherm is assumed to be a plane at 20 km depth, except for the spherical volume which is also non-magnetic. The stress pattern in the vicinity of the spherical chamber, due to regional stress of sufficient intensity to cause an eruptions, is used to calculate the change in magnetization which results from the piezomagnetic effect through the volume of solid rock. The consequent magnetic field anomaly at the surface is then obtaied by numerical integration of the dipole law of force over the stressed volume. For rocks of the type found on the volcanic island of St. Vincent (West Indies), this model gives a maximum local volcano-magnet c effect of about 7 gammas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00875290
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Field-induced anisotropy of magnetic susceptibility in rocks (1969)
    Springer
    Pure and applied geophysics 76 (1969), S. 123-129 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary An induced anisotropy of magnetic susceptibility results from the domain alignment which is produced by treating stationary specimens in a strong alternating field. Appreciable domain re-orientation occurs in fields as low as 50 oersteds and the effect must therefore normally be an important part of the process of alternating field demagnetization. Induced anisotropy has been measured in a number of igneous rocks with a range of palaeomagnetic stabilities and in magnetite powders of controlled grain sizes, dispersed in plaster or kaolin specimens which were mechanically deformed to produce instrinsic magnetic anisotropy by grain alignment. The saturation magnitude of the induced anisotropy is not a function of grain size but the saturating field required increases with decreasing grain size. In the larger grains, induced anisotropy is a function of grain orientation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877845
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal relaxation of magnetic domain misalignment in rocks (1969)
    Springer
    Pure and applied geophysics 76 (1969), S. 130-136 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The anisotropy of susceptibility which is induced in rocks and dispersed powdered magnetite by the application of a strong alternating field is removed by heating more rapidly than is thermoremanence in the same specimens. The anisotropy associated with thermoremanence induced in the earth's field is negligible, but in fields greater than 5 oersteds it becomes appreciable. It is concluded that the domain structure associated with low field thermoremanence is only a very slight perturbation of the zero field structure. However this is much less simple than has been supposed and involves two- or three-dimensional domain closure. An appropriate minor revision of the theory of multidomain thermoremanence is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877846
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    Paper (German National Licenses)
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