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Geology; May 2005; v. 33; no. 5; p. 357-366; DOI: 10.1130/G21207.1
© 2005 Geological Society of America
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Cooling of the lower oceanic crust

John Maclennan*,1, Tom Hulme1 and Satish C. Singh1

1 Laboratoire des Geosciences Marines, Institut de Physique du Globe de Paris, 4 Place Jussieu, 75005 Paris, France

Thermal models of mid-ocean ridges that balance the influx of heat from magmatic sources with the removal of heat by conduction and hydrothermal circulation allow quantification of cooling of young oceanic crust. These models reproduce key observations relating to crustal accretion and hydrothermal cooling at fast-spreading ridges. The rate of cooling is constrained both by the bathymetry of ridge axes and by olivine compositions from ophiolite gabbros. Successful models involve extensive hydrothermal cooling of the lower crust within 20 km of the ridge, with ~50–70 kW of hydrothermal cooling for every 1 m of ridge axis at crustal ages of <0.1–0.4 Ma. These estimates can be used to refine global models of geochemical and thermal fluxes close to spreading ridges.

Key Words: mid-ocean ridges • oceanic crust • hydrothermal • East Pacific Rise • Oman ophiolite




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