Abstract
A consideration of sources of local heat in crust and subcxust and a recognition of the significance of horizontal variations in geothermal gradients, and consequent irregularities of shallow geoisotherms, together lead directly to the interpretations that the levels of magma formation are relatively shallow, and that in the levels of smoothly concentric geoisotherms (beneath the influence of shallow sources of heat), temperatures are so low that other factors decree a strength too great to permit a continuous zone of weakness for isostatic adjustment. The conception of the asthenosphere is criticized on other grounds and a mechanism is provided for disturbing, as well as for correcting, the isostatic balance.
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