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January 1, 2013
Oceanic crust is created as magma rises to fill the gap between diverging tectonic plates and is consumed in subduction zones. It is geologically young, with a mean age of 60. Ma, and is thin, averaging 6.5. km in thickness. Oceanic crust consists almost e ...
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December 4, 2003
Approximately 60% of the Earth’s surface consists of oceanic crust (Cogley, 1984). New ocean crust is created at divergent plate boundaries called ocean ridges or spreading centers (Figure 1). Once created, the oceanic crust is transported off-axis to each ...
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1992
Mid-ocean ridge basalts (MORB) are a consequence of pressure-release melting beneath ocean ridges, and contain much information concerning melt formation, melt migration and heterogeneity within the upper mantle. MORB major element chemical systematics can ...
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