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Cordilleran Intermontane thermotectonic history and implications for neotectonic structure and petroleum systems, British Columbia, Canada

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Abstract

Heat flow increases northward along Intermontane Belt in the western Canadian Cordillera, as shown by geothermal differences between Bowser and Nechako sedimentary basins, where geothermal gradients and heat flows are ∼30 mK/m and ∼90 mW/m2 compared to ∼32 mK/m and 70 –80 mW/m2, respectively. Sparse temperature profile data from these two sedimenatary basins are consistent with an isostatic model of elevation and crustal parameters, which indicate that Bowser basin heat flow should be ∼20 mW/m2 greater than Nechako basin heat flow. Paleothermometric indicators record a significant northward increasing Eocene or older erosional denudation, up to ∼7 km. None of the heat generation, tectonic reorganization at the plate margin, or erosional denudation produce thermal effects of the type or magnitude that explain the north–south heat flow differences between Nechako and Bowser basins. The more southerly Nechako basin, where heat flow is lower, has lower mean elevation, is less deeply eroded, and lies opposite the active plate margin. In contrast, Bowser basin, where heat flow is higher, has higher mean elevation, is more deeply eroded, and sits opposite a transform margin that succeeded the active margin ∼40 Ma. Differences between Bowser and Nechako basins contrast with the tectonic history and erosion impacts on thermal state. Tectonic history and eroded sedimentary thickness suggest that Bowser basin lithosphere is cooling and contracting relative to Nechako basin lithosphere. This effect has reduced Bowser basin heat flow by ∼10–20 mW/m2 since ∼40 Ma. Neither can heat generation differences explain the northerly increasing Intermontane Belt heat flow. A lack of extensional structures in the Bowser basin precludes basin and range-like extension. Therefore, another, yet an unspecified mechanism perhaps associated with the Northern Cordilleran Volcanic Province, contributes additional heat. Bowser basin’s paleogeothermal gradients were higher, ∼36 mK/m, before the Eocene and this might affect petroleum and metallogenic systems.

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Acknowledgments

The paper benefited from very helpful reviews of Drs Alan Jessop, Jan Safanda and Topical Editor Vladimir Cermak. We also thank Roy Hyndman of GSCP, Sidney B.C. for helpful suggestions given to first author (JM) at earlier stages of this research. The authors thank Lavern Stasiuk and David Ritcey of the GSC in Calgary and Victoria, respectively, for the provision of the organic maturation data. We would like to acknowledge the support of F. Ferri BC Ministry of Energy and Mines for this study.

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  1. NGC EDMONTON, 105 Carlson Close, Edmonton, AB, Canada, T6R 2J8

    Jacek Majorowicz

  2. Geological Survey of Canada (Calgary), 3303 33rd St. NW, Calgary, AB, Canada, T2L 2A7

    Kirk Osadetz

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Majorowicz, J., Osadetz, K. Cordilleran Intermontane thermotectonic history and implications for neotectonic structure and petroleum systems, British Columbia, Canada. Int J Earth Sci (Geol Rundsch) 97, 269–287 (2008). https://doi.org/10.1007/s00531-007-0215-x

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