bernard brunhes discovered rocks in france in 1906 with reversed magnetic polarity
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Bernard BrunhesDiscovered rocks in France in 1906 with reversed magnetic polarity
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Cretaceous ‘superchron’
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Pacific Antarctic ridge
Schematic model
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Drummond Matthews (left) and Fred VineCambridge University
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Magnetic anomaliesover the ReykjanesRidge (S. of Iceland) from Vine & Matthews(1963).
Positive anomalies arecolored, negative onesare white.
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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)
Gilbert
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Juan de Fuca East Pacific Rise
observed
mirror image
model
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Relative spreading rates
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Blanco fracture zone
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Alfred Wegener
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Wegener’s map(1910). Note the distortion of India.
Map made witha computer(1965).
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The meaning of an “apparent” polarwander path (APWP).
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S. Keith Runcorn(1922 – 1995)
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Computer-generatedfit of the Atlantic-bordering continents(Bullard et al., 1965),minimizing gaps and overlaps.
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Ages of the Ocean floor determined from magnetic anomalies (~ 1990)
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Late Cretaceous (~85 Ma) map of the world (Scotese, 1981)
www.scotese.com
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Magnetic field during reversals
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Geodynamo simulations (Glatzmaier and Roberts, 1996)
Inner core
Outer core
High fluid velocity intangent cylinder
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Magnetic field lines
Close up of inner core
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