Neogaean paleomagnetism constraints on the processes at the core and surface of the Earth
D. M. Pechersky


Main conclusions which follow from the analysis of the geomagnetic field behavior during the Neogaea and its relation to processes at the Earth's surface were stated at the end of the first and second sections. Here, restricting myself to a general consideration, I do not offer hypothetical mechanisms common to processes at the core and Earth's surface, especially as the mechanism of a (paleo)magnetic record (magnetic tape recorder) and its "author" (age and other characteristics of operator) cannot be directly determined. One may definitely state that long processes (tens and hundreds million years) at the core and Earth's surface are causally not related but are controlled by a mechanism (mechanisms) common to these processes, which occur either synchronously (external mechanism) or asynchronously (internal mechanism). One may suggest a combined action of both mechanisms: the external mechanism bring about processes in the D'' layer (activity, instability, etc.), which in their turn stimulate heat and mass transfer in the mantle, controlled by the internal mechanism. Mantle mass movements (convection, plumes, subduction) induced by the D'' layer activity are related to the drift of continents and thereby change the planetary moment of inertia, which again stimulates the synchronous action of the "external" mechanism, and so on. Such a scheme accounts for the long-period cyclicity and interrelation of processes.


This work was supported by the Russian Foundation for Basic Research, Project No. 96-05-64118.

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