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He has recently begun work on the Oman Ophiolite complex which provides access to rocks which once made up the Oceanic crust and upper mantle.
Another of his hypotheses is that the theory of convective mantle plumes in the Earth, as proposed by W. Jason Morgan, is invalid and that hotspots and oceanic islands such as Hawaii or Iceland are rather caused by chemical/mineralogical anomalies in the upper mantle.