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It is postulated that worldwide transgressions (pulsations) and regressions (interpulsations) throughout the course of geologic time are related to the elevation and subsidence of oceanic ridge systems and to sea-floor spreading. During the Mesozoic-Cenozoic interval, for example, the Cretaceous represents a period of worldwide transgression of the seas over the continents. Such a transgression may have been caused by the elevation of the old Mid-Pacific Ridge system, which in turn displaced a considerable amount of sea water from the ocean basins to the continents.

Two multiple working hypotheses are proposed to explain major transgressions and regressions and the elevation and subsidence of oceanic ridge systems. One hypothesis interrelates the sea-floor spreading hypothesis to the hypothesis of sub-Mohorovičić serpentinization. The second hypothesis relates the sea-floor spreading hypothesis to a hypothesis involving thermal expansion and contraction.

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