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Bernard Brunhes Discovered rocks in France in 1906 with reversed magnetic polarity

Bernard Brunhes Discovered rocks in France in 1906 with reversed magnetic polarity. Cretaceous ‘superchron’. Pacific Antarctic ridge. Schematic model. Drummond Matthews (left) and Fred Vine Cambridge University. Positive anomalies are colored, negative ones are white.

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Bernard Brunhes Discovered rocks in France in 1906 with reversed magnetic polarity

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  1. Bernard Brunhes Discovered rocks in France in 1906 with reversed magnetic polarity

  2. Cretaceous ‘superchron’

  3. Pacific Antarctic ridge Schematic model

  4. Drummond Matthews (left) and Fred VineCambridge University

  5. Positive anomalies arecolored, negative onesare white. Magnetic anomaliesover the ReykjanesRidge (S. of Iceland) from Vine & Matthews(1963).

  6. Gilbert Magnetic anomalypatterns acquired by the oceanic crust, while it formed during the Gilbert Reversed Chron (top) and afterwards (fromVine & Matthews, 1963) Gauss Matuyama Brunhes (today)

  7. Juan de Fuca East Pacific Rise observed mirror image model

  8. Relative spreading rates

  9. Blanco fracture zone

  10. Alfred Wegener

  11. Wegener’s map(1910). Note the distortion of India. Map made witha computer(1965).

  12. The meaning of an “apparent” polarwander path (APWP).

  13. S. Keith Runcorn(1922 – 1995)

  14. Computer-generatedfit of the Atlantic-bordering continents(Bullard et al., 1965),minimizing gaps and overlaps.

  15. Ages of the Ocean floor determined from magnetic anomalies (~ 1990)

  16. Late Cretaceous (~85 Ma) map of the world (Scotese, 1981) www.scotese.com

  17. Magnetic field during reversals

  18. Geodynamo simulations (Glatzmaier and Roberts, 1996) Inner core Outer core High fluid velocity in tangent cylinder

  19. Magnetic field lines Close up of inner core

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