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The electrical resistivity structure of Archean to Tertiary lithosphere along 3200 km of SNORCLE profiles, northwestern Canada

Alan G. Jones, Juanjo Ledo, Ian J. Ferguson, Colin Farquharson, Xavier Garcia, Nick Grant, Gary McNeice, Brian Roberts, Jessica Spratt, Grant Wennberg, Lisa Wolynec and Xianghong Wu
The electrical resistivity structure of Archean to Tertiary lithosphere along 3200 km of SNORCLE profiles, northwestern Canada (in The Lithoprobe Slave-NORthern Cordillera Lithospheric Evolution (SNORCLE) transect--La geotraverse de l'evolution lithospheric de la Cordillere du Nord et de la province du lac des Esclaves (SNORCLE), F. A. Cook (editor) and P. Erdmer (editor))
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (June 2005) 42 (6): 1257-1275

Abstract

Magnetotelluric (MT) measurements to image the three-dimensional resistivity structure of the North American continent from an Archean core to a region of Tertiary assembly were recorded at almost 300 sites along 3200 km of profiles on the Lithoprobe Slave-Northern Cordillera Lithospheric Evolution (SNORCLE) transect in northwestern Canada. At the largest scale, the MT results indicate significant lithospheric thickness variation, from 260 km at the southwest margin of the Slave craton to significantly <100 km at the southwestern end of the SNORCLE transect in the Cordillera. At intermediate scale, the resistivity results allow broad terrane subdivisions to be made. Several anomalously conductive zones along the SNORCLE transect, in rocks ranging in age from Archean to Tertiary, are attributed to the introduction of either water or carbon into the crust and mantle during subduction processes. At the local scale, the MT data image two major faults crossing the study area, the Great Slave Lake shear zone and the Tintina Fault. The resistivity images show that both the Tintina Fault and Great Slave Lake shear zone form crustal-scale features, and that the Tintina Fault has a remarkably uniform resistivity signature over a 400 km strike length in the study area. Arguably the most controversial conclusion reached is that the MT data do not support the western extension of North American autochthonous basement suggested from interpretation of the seismic reflection data.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 42
Serial Issue: 6
Title: The electrical resistivity structure of Archean to Tertiary lithosphere along 3200 km of SNORCLE profiles, northwestern Canada
Title: The Lithoprobe Slave-NORthern Cordillera Lithospheric Evolution (SNORCLE) transect--La geotraverse de l'evolution lithospheric de la Cordillere du Nord et de la province du lac des Esclaves (SNORCLE)
Affiliation: Geological Survey of Canada, Ottawa, ON, Canada
Affiliation: University of Calgary, Department of Geological Sciences, Calgary, AB, Canada
Pages: 1257-1275
Published: 200506
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 80
Accession Number: 2006-024680
Categories: Solid-earth geophysicsApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Lithoprobe Publ. No. 1408; Dublin Inst. Adv. Stud., Publ. GP174
Illustration Description: illus. incl. sects., 1 table, sketch maps
N62°00'00" - N69°00'00", W117°00'00" - W105°00'00"
Secondary Affiliation: University of Alberta, CAN, CanadaUniversity of Manitoba, CAN, CanadaUniversity of British Columbia, CAN, CanadaPhoenix Geophysics, CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200613
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