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In search of a paleomagnetic “smoking gun” for Precambrian plate tectonics

In search of a paleomagnetic “smoking gun” for Precambrian plate tectonics. Conclusions: Dipole hypothesis likely OK but not certain Total terrane motion = TPW + individual motion Smoking gun: Match APW paths and geology. from Evans, 2003. TPW on Earth. Richards & Engebretson, 1992 Nature.

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In search of a paleomagnetic “smoking gun” for Precambrian plate tectonics

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  1. In search of a paleomagnetic “smoking gun” for Precambrian plate tectonics Conclusions: Dipole hypothesis likely OK but not certain Total terrane motion = TPW + individual motion Smoking gun: Match APW paths and geology

  2. from Evans, 2003 TPW on Earth

  3. Richards & Engebretson, 1992 Nature

  4. from Evans, 1998, EPSL v.157, p.1-8

  5. Supercontinent – TPW predictions

  6. TPW legacy

  7. A common TPW axis

  8. Buchan et al., 2000

  9. 2101±2 Ma Superior2.22-1.88 Ga MOLSON 1880 Ma Buchan et al., 1998 Halls and Heaman, 2000 Kaapvaal2.22-1.87 Ga De Kock et al., in press

  10. Paleomagnetic success story after McElhinny, 1973

  11. Hoffman, 1988 Nuna: United Plates of America

  12. Smoking gun at 1.8 Ga New synthesis of Slave+Superior 2.1-2.0 Ga 1.96 Ga 1.88 Ga 1.75 Ga

  13. Smoking gun at 1.8 Ga New synthesis of Slave+Superior 2.1-2.0 Ga 1.96 Ga Conclusions: Dipole hypothesis likely OK but not certain Total terrane motion = TPW + individual motion Smoking gun: Match APW paths and geology 1.75 Ga

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