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- W2034671137 abstract "From structural studies in seventeen ophiolite massifs, information has been drawn about the activity of the asthenosphere beneath oceanic spreading centers. This information, together with geophysical data pertaining to oceanic ridges, has been integrated into a numerical model. It is inferred that for a fast-spreading ridge (< 5 cm/yr) a local diapiric uprise of melted peridodite is superimposed to the main circulation driven by the lithosphere drifting. As a result, the upward flow splits, at a depth of 35 km, into a 10–20 km wide axial jet and a horizontal flow diverging away from the ridge. The small diapir channels upward most of the partially molten peridotites. Magmatic activity in the crust is thus constrained to an area of similar horizontal extension, in agreement with ophiolitic and oceanic data. Also in agreement with findings in ophiolites, the meeting at a few tens of kilometers away from the ridge of the two diverging mantle circulations, creates a change in shear sense of the flow. From there on, the horizontal diverging flow is compatible with lithosphere drift." @default.
- W2034671137 created "2016-06-24" @default.
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- W2034671137 date "1984-01-01" @default.
- W2034671137 modified "2023-10-14" @default.
- W2034671137 title "A rolling mill effect in asthenosphere beneath oceanic spreading centers" @default.
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- W2034671137 doi "https://doi.org/10.1016/0012-821x(84)90042-6" @default.
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