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


Tpw on earth

from Evans, 2003 Precambrian plate tectonics

TPW on Earth


Richards engebretson 1992 nature
Richards & Engebretson, 1992 Nature Precambrian plate tectonics


from Evans, 1998, EPSL v.157, p.1-8 Precambrian plate tectonics


Supercontinent tpw predictions
Supercontinent – TPW predictions Precambrian plate tectonics


Tpw legacy
TPW legacy Precambrian plate tectonics


A common tpw axis
A common TPW axis Precambrian plate tectonics


Buchan et al., 2000 Precambrian plate tectonics


Superior 2 22 1 88 ga

2101±2 Ma Precambrian plate tectonics

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 Precambrian plate tectonics

after

McElhinny, 1973


Nuna united plates of america

Hoffman, 1988 Precambrian plate tectonics

Nuna: United Plates of America


Smoking gun at 1 8 ga
Smoking gun at 1.8 Ga Precambrian plate tectonics

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 Precambrian plate tectonics

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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