| Reference Type | Journal (article/letter/editorial) |
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| Title | Electromagnetic sounding and crustal electrical conductivity in the region of the Wopmay Orogen, Northwest Territories, Canada |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Camfield, P. A. | Author |
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| Gupta, J. C. | Author |
| Jones, A. G. | Author |
| Kurtz, R. D. | Author |
| Krentz, D. H. | Author |
| Ostrowski, J. A. | Author |
| Craven, J. A. | Author |
| Year | 1989 (November 1) | Volume | 26 |
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| Issue | 11 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e89-203Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 480276 | Long-form Identifier | mindat:1:5:480276:5 |
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| GUID | 0 |
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| Full Reference | Camfield, P. A., Gupta, J. C., Jones, A. G., Kurtz, R. D., Krentz, D. H., Ostrowski, J. A., Craven, J. A. (1989) Electromagnetic sounding and crustal electrical conductivity in the region of the Wopmay Orogen, Northwest Territories, Canada. Canadian Journal of Earth Sciences, 26 (11) 2385-2395 doi:10.1139/e89-203 |
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| Plain Text | Camfield, P. A., Gupta, J. C., Jones, A. G., Kurtz, R. D., Krentz, D. H., Ostrowski, J. A., Craven, J. A. (1989) Electromagnetic sounding and crustal electrical conductivity in the region of the Wopmay Orogen, Northwest Territories, Canada. Canadian Journal of Earth Sciences, 26 (11) 2385-2395 doi:10.1139/e89-203 |
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| In | (1989, November) Canadian Journal of Earth Sciences Vol. 26 (11) Canadian Science Publishing |
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| Abstract/Notes | Temporal variations of the three components of the geomagnetic field were recorded at eight sites along a 240 km profile across the Early Proterozoic Wopmay Orogen. After an empirical separation of these data into normal and anomalous parts, horizontal-to-vertical-field transfer functions in the period range 40–1200 s display evidence for a minor anomaly spatially located near the allochthonous shelf margin at the eastern edge of the Hepburn Batholith. The observations can be partially simulated by a two-dimensional 20 ? m body (30 km wide, 2 km thick) embedded in the surface of a very resistive layered Earth model derived from inversion of magnetotelluric sounding data at a central station. The body correlates spatially with metamorphosed graphitic pelites of the Odjick Formation (Epworth Group), a unit of deep-water facies interpreted as continental slope–rise deposits. Laboratory measurements on samples of the pelite yielded resistivity values of the order of 104 ?∙m, so the enhanced conductivity of the body is more likely caused by water filling cracks associated with the pelites' well-developed cleavage and schistosity, rather than by the graphite. A scalar audiomagnetotelluric survey across the Wopmay fault zone, a prominent structure that bisects the orogen, gave results very much distorted by three-dimensional effects. The electric-polarization apparent resistivities of these data indicate a shallow conductor 2 km east of the fault scarp, 1–2 km wide. Models of the feature suggest that its vertical extent is at least 1–2 km. |
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