Lagging mantle convection,the geoid and mantle structure |
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| Authors: | Geoffrey F Davies |
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| Institution: | Research School of Earth Sciences, Australian National University, Canberra, A.C.T. 2600 (Australia) |
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| Abstract: | In numerical models of convection incorporating migration of a simulated subduction zone, the main descending flow lags far behind the migrating trench, and a geoid low is associated with the main descending flow. This provides physical plausibility for the suggestion by Chase and Sprowl that present very long-wavelength (degree 2–4) geoid lows are associated with Mesozoic trench locations, and suggests further that the present long-wavelength geoid, deep mantle structure and hotspot distribution may be straightforward consequences of plate evolution since the Upper Paleozoic. |
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