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University of Cambridge > Talks.cam > Isaac Newton Institute Seminar Series > Observational constraints on mantle melt transport
Observational constraints on mantle melt transportAdd to your list(s) Download to your calendar using vCal
If you have a question about this talk, please contact INI IT. This talk has been canceled/deleted The review paper of Kelemen et al. (1997) summarised the key observations used to develop a model of rapid melt extraction in porous channels. Many subsequent observations have been acquired with the aim of refining estimates of the timescales of melt extraction from the mantle. Nevertheless, substantial uncertainty remains concerning how these observations can be used to characterise variation in melt transport velocities under basaltic volcanoes at spreading ridges and ocean islands. Uranium series disequilibria indicate that melt transport rates are almost certainly >1 m yr-1 and probably >50 m yr-1. An alternative method for estimating melt transport rates is based upon the observational record of the response of magmatism to loading and unloading of a mantle melting region. Such loading cycles may be generated by with glaciation and sea-level change. It is well-established that the record of volcanic productivity in certain regions of Iceland is strongly influenced by variations in the load from glaciation of the island. The minimal time-lag between deglaciation and a burst in volcanic productivity indicates that melt transport is rapid (>50 m yr-1). More recent analyses of seafloor morphology and temporal variation in hydrothermal activity at submerged mid-ocean ridges have made a tentative link between sea-level fall during glacial growth and increased magmatic activity during glacial terminations. This link can only work if melt extraction rates are This talk is part of the Isaac Newton Institute Seminar Series series. This talk is included in these lists:This talk is not included in any other list Note that ex-directory lists are not shown. |
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