Drummond Matthews

Drummond Hoyle Matthews FRS (5 February 1931 – 20 July 1997) was a British marine geologist and geophysicist and a key contributor to the theory of plate tectonics. His work, along with that of fellow Briton Fred Vine and Canadian Lawrence Morley, showed how variations in the magnetic properties of rocks forming the ocean floor could be consistent with, and ultimately help confirm, Harry Hammond Hess's 1962 theory of seafloor spreading. In 1989 he was awarded the Geological Society of London's highest honour, the Wollaston Medal.

During World War II he went to school at The Downs in Malvern, and then Bryanston School in Dorset. He became head boy at both.

Alfred Wegener's theory of continental drift had never gained much scientific support due to its lack of any satisfactory mechanism to drive the process. During the 1950s, however, extensive surveys of the ocean floor revealed a global, linked system of mid-ocean ridges, all of which exhibited high thermal flow and considerable seismic activity. Hess hypothesized that new ocean crust was being formed at the ocean ridges by extrusions of magma from the Earth's mantle, and that convection currents within the mantle were continuously carrying the newly formed crust away from the ridge, widening the ocean basin and pushing the continents apart.

In 1962 Matthews, as a research fellow at King's College, Cambridge, made a survey across part of an ocean ridge in the north-west Indian Ocean. This revealed a pattern of magnetic anomalies running in parallel stripes and virtually symmetrically on either side of the ridge. The most plausible explanation for these anomalies required the assumption (already in circulation at the time, but not yet proven) that the Earth's magnetic field had reversed its polarity repeatedly over time. Ocean crust consists of basic igneous rock, containing significant amounts of magnetite. When such rock solidifies, the magnetite aligns itself with the prevailing magnetic field at the time, thus providing a sort of "fossil" magnetic record. If new crust were being formed at the ridges and moving away, as Hess theorized, then reversals in the Earth's magnetic polarity would result in just the kind of parallel, symmetrical anomalies that Matthews' survey had found. The ocean crust would in effect act as a kind of giant tape recorder of magnetic anomalies over time.

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