in search of a paleomagnetic smoking gun for precambrian plate tectonics
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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
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

superior 2 22 1 88 ga

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

paleomagnetic success story
Paleomagnetic success story

after

McElhinny, 1973

smoking gun at 1 8 ga
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

smoking gun at 1 8 ga1
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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