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Superswell
A superswell is a large area of anomalously high topography and shallow ocean regions. These areas of anomalous topography are byproducts of large upwelling of mantle material from the core–mantle boundary, referred to as superplumes.〔 Two present day superswells have been identified: the African superswell and the South Pacific superswell. In addition to these, the Darwin Rise in the south central Pacific Ocean is thought to be a paleosuperswell, showing evidence of being uplifted compared to surrounding ancient ocean topography.
==Superplume==
Data shows a dramatic increase in crustal production from 125-120 Ma. to 70 Ma, largely in East Pacific Rise areas, although the marked increase in production rates of crustal material was also seen in the Gondwana ridges, as well as in oceanic plateaus. This period of increased crustal production is interpreted as a superplume event. This "pulse" of increased crustal production peaked soon after the initial plume (between 120 Ma and 100 Ma), and then declined over the next thirty million years.〔 Along with the increase in crustal output from ridges, there is an extended period in the time frame from 125 Ma to 40 Ma where the earth's magnetic field reversal frequency declines sharply. The last remnants of this superplume event are the South Pacific superswell located underneath Tahiti.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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