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  • Cambridge University Press  (3)
  • London [u.a.] : Acad. Press  (1)
  • 1
    Monograph available for loan
    Monograph available for loan
    Gravity, deformation and the earth's crust as studies by centrifuged models (1967)
    London [u.a.] : Acad. Press
    Details Availability
    Call number: O 3623 ; G 8317 ; 6194
    Type of Medium: Monograph available for loan
    Pages: IX, 214 S. : Ill., graph. Darst., Kt.
    Location: Upper compact magazine
    Location: Upper compact magazine
    Location: Upper compact magazine
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 2
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    Note on Model Studies of Folding of Moraines in Piedmont Glaciers (1964)
    Cambridge University Press
    Details
    Publication Date: 1964-01-01
    Description: The pattern of flow of moraine-carrying glaciers is studied by models whirled in a centrifuge. Because of the rather high centrifugal force (1,000g), substances with high viscosity, such as bouncing putty and stitching wax (viscosity around 106–107poises), can be used as glacier-imitation materials. As moraine-imitation material powdered hard wax is used. The strength and high viscosity of the model materials permit detailed structures to be studied without the disturbing effects of sagging after being run to the chosen stage in the centrifuge. Stroboscopic light makes it possible to follow the evolution of the flow and to stop the centrifuge and thus the flow at any stage.Rather realistic-looking fold structures of the kind seen in some piedmont ice sheets develop readily after a few minutes’ run in the centrifuge.The mechanism of fold evolution is discussed.No slip (or shear) has taken place along a “foliation” which sometimes develops parallel to the axial planes of the folds.
    Print ISSN: 0022-1430
    Electronic ISSN: 1727-5652
    Topics: Geography , Geosciences
    Published by Cambridge University Press on behalf of International Glaciological Society.
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  • 3
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    Note on Model Studies of Folding of Moraines in Piedmont Glaciers (1964)
    Cambridge University Press
    Details
    Publication Date: 1964-01-01
    Description: The pattern of flow of moraine-carrying glaciers is studied by models whirled in a centrifuge. Because of the rather high centrifugal force (1,000 g), substances with high viscosity, such as bouncing putty and stitching wax (viscosity around 106–107 poises), can be used as glacier-imitation materials. As moraine-imitation material powdered hard wax is used. The strength and high viscosity of the model materials permit detailed structures to be studied without the disturbing effects of sagging after being run to the chosen stage in the centrifuge. Stroboscopic light makes it possible to follow the evolution of the flow and to stop the centrifuge and thus the flow at any stage.Rather realistic-looking fold structures of the kind seen in some piedmont ice sheets develop readily after a few minutes’ run in the centrifuge.The mechanism of fold evolution is discussed.No slip (or shear) has taken place along a “foliation” which sometimes develops parallel to the axial planes of the folds.
    Print ISSN: 0022-1430
    Electronic ISSN: 1727-5652
    Topics: Geography , Geosciences
    Published by Cambridge University Press on behalf of International Glaciological Society.
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  • 4
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    Evolution of Drag Folds (1963)
    Cambridge University Press
    Details
    Publication Date: 1963-04-01
    Description: Theory and experiments show that a component of compressive strain parallel to layering is necessary to develop drag folds. The component of shear strain needed for the monoclinic symmetry of such folds is not sufficient to form the wavy pattern. Based upon fluid dynamic theory and experiments with layered rubber slabs it is suggested that drag folds on flanks of major folds generally evolve as follows: Layer-parallel compression of more or less straight layered rocks causes some layers to shorten essentially by more or less uniform compressive strain and thickening (thick and not-so-competent layers), other layers to shorten essentially by buckling (thin and most component layers). In the course of time, however, the rate of buckling of the thick layers becomes significant relative to the rate of arc-shortening, and the thin layers with the early formed short buckles are forced to mimic the larger folds of the thick layers more or less passively. In this process the early formed short buckles become tilted and assume the typical drag-fold shape.
    Print ISSN: 0016-7568
    Electronic ISSN: 1469-5081
    Topics: Geosciences
    Published by Cambridge University Press
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