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NEW HYPOTHESIS PROVIDES A BASIS FOR THE REALITY OF ATLANTIS AND LEMURIA

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Author Topic: NEW HYPOTHESIS PROVIDES A BASIS FOR THE REALITY OF ATLANTIS AND LEMURIA  (Read 1368 times)
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Lisa Wolfe
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« on: January 17, 2015, 08:53:30 pm »

Keith proposes that fracture zones and transform faults (see Fig. 2) are ocean-floor surface expressions of the boundaries of “convective rolls” in the underlying mantle. Such rolls are judged to be “the principal form of secondary convection within the upper boundary layer of sub-ridge mantle, a low-viscosity region estimated at 75-125 km thick....” (p. 240). Translating Keith's words for the non-geologist reader, imagine that the primary, heat-driven flow of the uppermost mantle is outward from beneath a continent like Africa, and toward the MAR. As the mantle moves there is subsequent heat loss in the oceanic region. In the downstream region of lateral flow and heat loss there is development of an upper mantle boundary layer that eventually becomes unstable and yields a regular pattern of upper mantle “rolls” aligned in the direction of principal flow. Boundaries that develop along each edge of a roll result in ocean floor fractures and transform faults. (A transform fault is merely a near-vertical surface over which one side slips past the other, but is unique in that the displacement suddenly stops or changes form).

To end his description of the formation of magnetic stripes on the sea-floor, Keith cites relevant laboratory, numerical modeling, and field measurements. He concludes by saying that the evidence is consistent with his proposed upper-mantle convergent flow and contrary to the plate tectonics model of mid-ocean upwelling and divergent flow.

To quote Keith on the implications of Figures 3 and 4, “the proposed ridge-cooling model of magnetic stripe formation does not involve spreading or continental splitting, and there are no implications regarding continental drift, except that the continents are presumed to be floating in the mantle, each focusing one or more upwelling plumes, and free to move in response to changes in the global [mantle] convection pattern. The principal continental drift will be related to mantle surge episodes, and there will be a strong tendency for continents to re-establish their separate positions as part of a return to a steady-state flow regime.”
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