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HESS HYPOTHESIS [2 records]

Record 1 1977-03-29

English

Subject field(s)
  • Plate Tectonics
  • Tectonics
OBS

Hess suggested that the continents do not plow their way through the ocean floor but move with it much like coal on a conveyor belt. He proposed that the sea floor is being continuously generated along linear fissures running for thousands of kilometers through the major ocean basins, molten rock wells up into the fissures from the mantle below and quickly hardens (...). Elsewhere on the earth the ocean floor plunges into a trench and then sinks to great depths in the mantle.

French

Domaine(s)
  • Tectonique des plaques
  • Tectonique
OBS

Un courant ascendant issu du manteau injecte dans l'écorce terrestre, au niveau de ride médiocéanique, du matériel nouveau qui s'insinue dans la lithosphère antérieure; celle-ci se déplace latéralement à la même vitesse que le manteau. Les continents solidaires des océans sont également portés sur le dos de courants animant l'asthénosphère comme ils le seraient sur un tapis roulant (...)

Spanish

Save record 1

Record 2 1977-03-29

English

Subject field(s)
  • Plate Tectonics
  • Tectonics
  • Magnetism
OBS

(...) F. J. Vine and D. H. Matthews of the University of Cambridge proposed a convincing test of the hypothesis advanced by Hess. It was based on the discovery(...) that the earth's magnetic field had reversed direction a number of times in past ages. They reasoned that if molten rock were pushed up along the axis of the mid-ocean ridge, it would become magnetized in the direction of the earth's prevailing magnetic field as it cooled. If the newly cooled material was subsequently pushed out away from the ridge, it would form strips of alternately "normal" and "reversed" magnetism, depending on the polarity of the earth's magnetic field when the rock solidified.

French

Domaine(s)
  • Tectonique des plaques
  • Tectonique
  • Magnétisme
OBS

Ces auteurs ont supposé que les anomalies magnétiques observées sur les flancs des crêtes médi-océaniques étaient corrélables avec les inversions des pôles magnétiques relevées dans les sédiments. Ils suggèrent que le basalte émis au droit de la crête médiocéanique enregistre pendant son refroidissement le champ magnétique régnant. L'émission se poursuivant pendant des temps très longs, elle se fait tantôt lorsque l'époque est normale tantôt lorsqu'elle est inverse (...) L'expansion océanique se faisant par injection de basalte au niveau des crêtes et les flancs s'écartant symétriquement, les bandes d'anomalies enregistrent cette symétrie.

Spanish

Save record 2

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