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  • 1
    Electronic Resource
    Electronic Resource
    A Model of Crustal Conductive Structure In the Canadian Cordillera (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 117 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Results from magnetotelluric soundings in the frequency range 0.016–160 Hz are used to model conductive structure in the upper and middle crust along a section across strike of the Canadian Cordillera, a region of continental accretion associated with three successive subductions over the last 200 Ma. 2-D finite-difference modelling is applied to secure a first-order fit to observed phase and apparent resistivity pseudosections in two polarizations, with the electric field along geological strike (E-polarization) and across strike (B-polarization). the fit to observed fields, and its limitations, are shown in detail by comparing calculated and observed pseudosections. the misfits are instructive and are to be expected where 2-D modelling is fitted to 3-D structure in the Earth. the model nevertheless indicates two major resistive and three major conductive blocks in the upper and middle crust. the larger resistive block probably represents granitoid plutons of the Coast Plutonic Belt, which are shown to continue beneath the adjoining Intermontane Belt. the three conductive blocks are believed to result from saline water in fractures. the block under the Coast Plutonic Belt may draw its water from the currently active subduction offshore, whereas the block in line with the Fraser Fault may draw its water from the atmosphere and the block under the Omineca Belt from a global-scale upcurrent in the mantle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb03934.x
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  • 2
    Electronic Resource
    Electronic Resource
    Seismic reflectors, conductivity,water and stress in the continental crust (1986)
    [s.l.] : Nature Publishing Group
    Nature 323 (1986), S. 143-144 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Two remarkable features of the continental crust, illustrated in Fig. 1, have been recognized in recent geophysical results from western Europe and North America. Deep seismic profiles1"4 show many short, flat or slightly arcuate reflectors below -10-15 km depth, in contrast to an upper crust which ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/323143a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Earth sciences: Magnetotelluric evidence for subduction of seafloor sediments (1986)
    [s.l.] : Nature Publishing Group
    Nature 321 (1986), S. 566-566 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] NEW results from magnetotellufic soundings across Vancouver Island reported by R.D. Kurtz, J.M. DeLaurier and J.C. Gupta elsewhere in this issue (Nature 321, 596; 1986) provide the first correlation of high electrical conductivity with a seismic reflector at the top of a subducted plate. The good ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/321566a0
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    Paper (German National Licenses)
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