Abstract
Perhaps the most impressive factors in D.L. Anderson's analysis of new physical models of the earth are contributions from the numerous disciplines of modern geophysics, including 3‐dimensional seismological observations, high‐pressure experiments, highly precise isotope analyses, and studies of other solar system bodies [Science, 223, pp. 347–355, 1984].The results? In short, there are the “ins” and the “outs.” For example, the basalt‐eclogite transition is back in fashion, whereas the notion of an olivine‐rich deep mantle assemblage is no longer in fashion. This analogy is not to be construed as any return to old, preplate‐tectonic concepts. Modern research, in the purest sense, is forcing “a reexamination of some long‐held assumptions.”
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