Electromagnetic images of crustal structures in southern and central Canadian Cordillera

A. G. Jones, D. I. Gough

    Research output: Contribution to journalArticlepeer-review

    23 Citations (Scopus)

    Abstract

    Data from more than 400 magnetotelluric soundings, made since the early 1980s in the Canadian Cordillera over a 300 000 km 2 area between 40 and 53.5°N, are used to image qualitatively regional three-dimensional crustal variation in electrical conductivity by means of phase maps, phase-frequency sections, and maps of resistivity at depth. The lowest crust has a generally pervasive, low resistivity throughout the Cordillera west of the Foreland Belt. Observed lateral variations in conductivity may result from variations in fracture density, temperature, and the sources of hot fluid, such as the subducting Juan de Fuca plate under the Coast Belt, and mantle upflow under the Omineca Belt. -from Authors

    Original languageEnglish
    Pages (from-to)1541-1563
    Number of pages23
    JournalCanadian journal of earth sciences
    Volume32
    Issue number10
    DOIs
    Publication statusPublished - 1995

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