A rolling mill effect in asthenosphere beneath oceanic spreading centers

Details A rolling mill effect in asthenosphere beneath oceanic spreading centers A rolling mill effect in asthenosphere beneath oceanic spreading centers

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..67...97r&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 67, no. 1, Jan. 1984, p. 97-108. Research supported by the Centre Nat

Physics

Geophysics

57

Earth Mantle, Geophysics, Ocean Bottom, Tectonics, Flow Velocity, Igneous Rocks, Magma, Mathematical Models, Ridges

Scientific paper

From structural studies in 17 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 (more than 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.

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