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La Hipótesis de la Expansion del Fondo Oceánico

La Hipótesis de la Expansion del Fondo Oceánico. Expansión del Fondo Oceánico ( Sea-floor Spreading ).

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La Hipótesis de la Expansion del Fondo Oceánico

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  1. La Hipótesis de la Expansion del FondoOceánico

  2. Expansión del Fondo Oceánico (Sea-floor Spreading) • A principios de los años sesenta, Harry Hess, de la Universidad de Princeton, incorporo estos hechos recién descubiertos a una hipótesis que mas tarde se denominaría expansión del fondo oceánico (sea-floor spreading).

  3. Expansión del Fondo Oceánico (Sea-floor Spreading) • En el articulo, ahora clásico, de Hess, proponía que las dorsales oceánicas estaban localizadas sobre zonas de ascenso convectivo en el manto. • A medida que el material que asciende desde el manto se expande lateralmente, el suelo oceánico es transportado de una manera parecida a como se mueve una cinta transportadora alejándose de la cresta de la dorsal.

  4. Expansión del Fondo Oceánico (Sea-floor Spreading) • En estos puntos, las fuerzas tensiónales fracturan la corteza y proporcionan vías de intrusión magmática para generar nuevos fragmentos de corteza oceánica.

  5. Section Review • What observations support the continental drift hypothesis? • Shapes of continental coastlines, fossil distribution, climate change evidence, distinctive rock formations.

  6. Section Review • What evidence in support of plate tectonics is provided by studies of the ocean floor? • Shapes of continental coastlines, fossil distribution, climate change evidence, distinctive rock formations.

  7. Section Review • Explain how the theory of plate tectonics differs from the continental drift hypothesis? • Wegener could not explain how the continents move. The theory of plate tectonics states that continents and ocean basins move as the lithospheric plates move.

  8. Section Review • What would you expect to find if you measured the temperature of the rocks on the ocean floor at various distances from the mid-ocean ridge? • Temperature would decrease with distance from the ridge axis because as newly formed oceanic crust is moves farther from the ridge, it cools.

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