Thermal cooling of the oceanic lithosphere - New constraints from geoid height data

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Cooling, Geoids, Lithosphere, Ocean Bottom, Fracturing, Pacific Ocean, Planetary Evolution, Tectonics

Scientific paper

Geoid data at fracture zones have been analyzed on the basis of SEASAT altimeter measurements for the entire Pacific Ocean, yielding redeterminations of the parameters of cooling models for the oceanic lithosphere. Two distinct cooling regimes are revealed: one for seafloor ages in the zero-30 Myr range, the other beyond 30 Myr. This does not appear to be correlated with particular fracture zones, but rather to represent the entire area studied. On the basis of these results, it is concluded that the half-space cooling model is unable to explain the data. While a simple plate model gives a satisfactory fit to the data beyond 30 Myr, at lesser ages the cooling history of the oceanic lithosphere is much more complex than predicted by the usual cooling models.

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