| Reference Type | Journal (article/letter/editorial) |
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| Title | Magnetization age from paleomagnetism of the Copper Harbor red beds, Northern Michigan, USA, and its Keweenawan geologic consequences |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Symons, David T.A. | Author |
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| Kawasaki, Kazuo | Author |
| Diehl, Jimmy F. | Author |
| Year | 2019 (January) | Volume | 56 |
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| Issue | 1 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/cjes-2017-0094Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 485502 | Long-form Identifier | mindat:1:5:485502:0 |
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| GUID | 0 |
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| Full Reference | Symons, David T.A., Kawasaki, Kazuo, Diehl, Jimmy F. (2019) Magnetization age from paleomagnetism of the Copper Harbor red beds, Northern Michigan, USA, and its Keweenawan geologic consequences. Canadian Journal of Earth Sciences, 56 (1) 1-15 doi:10.1139/cjes-2017-0094 |
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| Plain Text | Symons, David T.A., Kawasaki, Kazuo, Diehl, Jimmy F. (2019) Magnetization age from paleomagnetism of the Copper Harbor red beds, Northern Michigan, USA, and its Keweenawan geologic consequences. Canadian Journal of Earth Sciences, 56 (1) 1-15 doi:10.1139/cjes-2017-0094 |
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| In | (2019, January) Canadian Journal of Earth Sciences Vol. 56 (1) Canadian Science Publishing |
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| Abstract/Notes | The Copper Harbor Formation on Lake Superiorās Keweenaw Peninsula records the transition from volcanic to sedimentary infilling of North Americaās 1.1 Ga Keweenawan rift. Radiometric dating shows that the formationās primary mafic sediments and interbedded āLake Shoreā flows were deposited between ā¼1092 and ā¼1082 Ma. Our regional paleomagnetic results for the Copper Harborās red beds yield a dominantly prefolding normal-polarity secondary chemical characteristic remanent magnetization in hematite at 18 of 21 sites with a mean direction of declination = 274.9Ā°, inclination = +10.9Ā° (k = 69.5, Ī±95 = 4.2Ā°), and a paleopole at 7.4Ā°N, 181.7Ā°E (A95 = 3.3Ā°). Using paleopoles from Keweenawan volcanic rocks with UāPb zircon age dates, an apparent polar wander path is constructed from 1106 Ā± 2 to 1087 Ā± 2 Ma. Extrapolation of this path dates oxidation of the Copper Harborās primary gray beds to red beds at 1060 Ā± 5 Ma. The path implies an apparent polar wander rate of ā¼18 cm per year from ā¼1108 to 1096 Ma and of 6.8 cm per year from 1096 to 1087 Ma, along with a consistent clockwise rotation of 0.30 Ā± 0.05Ā°per million years for the Laurentian Shield from ā¼1108 to ā¼1160 Ma. Further, most Keweenawan volcanic rocks around the Lake Superior region carry an endemic ā¼1060 Ma normal-polarity hematite remanence overprint, acquired during the initial stages of Grenvillian tectonic uplift, that has caused asymmetry in a unitās normal and reverse paleopoles. Also, the Copper Harbor paleopole dates emplacement of the White Pine stratiform sedimentary copper mineralization more precisely at 1060 Ā± 5 Ma. |
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