| Reference Type | Journal (article/letter/editorial) |
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| Title | Geochronology of the North American Midcontinent rift in western Lake Superior and implications for its geodynamic evolution |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Davis, D. W. | Author |
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| Green, J. C. | Author |
| Year | 1997 (April 1) | Volume | 34 |
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| Issue | 4 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e17-039Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 482945 | Long-form Identifier | mindat:1:5:482945:8 |
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| GUID | 0 |
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| Full Reference | Davis, D. W., Green, J. C. (1997) Geochronology of the North American Midcontinent rift in western Lake Superior and implications for its geodynamic evolution. Canadian Journal of Earth Sciences, 34 (4) 476-488 doi:10.1139/e17-039 |
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| Plain Text | Davis, D. W., Green, J. C. (1997) Geochronology of the North American Midcontinent rift in western Lake Superior and implications for its geodynamic evolution. Canadian Journal of Earth Sciences, 34 (4) 476-488 doi:10.1139/e17-039 |
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| In | (1997, April) Canadian Journal of Earth Sciences Vol. 34 (4) Canadian Science Publishing |
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| Abstract/Notes | Volcanism in the Midcontinent rift system lasted between 1108 and 1086 Ma. Rates of flood-basalt eruption and subsidence in the western Lake Superior region appear to have been greatest at the beginning of recorded activity (estimated 5 km/Ma subsidence rate at 1108 Ma) and rapidly waned over a period of 1–3 Ma during a magnetically reversed period. The age of the paleomagnetic polarity reversal is now constrained to be between 1105 ± 2 and 1102 ± 2 Ma. A resurgence of intense volcanism began at 1100 ± 2 Ma in the North Shore Volcanic Group and lasted until 1097 ± 2 Ma. This group contains a ca. 7 Ma time gap between magnetically reversed and normal volcanic sequences. A similar disconformity appears to exist in the upper part of the Powder Mill Group. The average subsidence rate during this period was approximately 3.7 km/Ma. Latitude variations measured from paleomagnetism on dated sequences indicate that the North American plate was drifting at a minimum rate of 22 cm/year during the early history of the Midcontinent rift. An abrupt slowdown to approximately 8 cm/year occurred at ca. 1095 Ma. These data support a mantle-plume origin for Midcontinent rift volcanism, with the plume head attached to and drifting with the continental lithosphere. Resurgence of flood-basalt magmatism at 1100 Ma may have been caused by extension of the superheated lithosphere following continental collision within the Grenville Orogen to the east. |
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