A double partial melt zone in the mantle beneath mid-ocean ridges

Details A double partial melt zone in the mantle beneath mid-ocean ridges A double partial melt zone in the mantle beneath mid-ocean ridges

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pepi...23..103p&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 23, Issue 2, p. 103-111.

Physics

4

Scientific paper

For a lherzolite mantle with about 0.1 wt.-percent CO2 or less, and a CO2/H2O mole ratio greater than about one, the mantle solidus curve in P-T space will have two important low-temperature regions, one centered at about 9 kbar (30 km depth) and another beginning at about 28 kbar (90 km depth). It is argued that the depth of generation of primary tholeiitic magmas beneath ridge crests is about 9 kbar, and that the geotherm changes from an adiabatic gradient at greater pressures to a strongly superadiabatic gradient at lesser pressures. Such a ridge geotherm would intersect the solidus at two separate depth intervals corresponding to the two low-temperature regions on the solidus. With increasing age and cooling of the lithosphere, the shallow partial melt zone would pinch out and the thickness of the deep partial melt zone would decrease. With increasing depth in a mature oceanic lithosphere, the rock types would consist of depleted harzburgite from directly beneath the crust to about 30 km depth, fertile spinel lherzolite from about 30 km to 50-60 km, and fertile garnet lherzolite from about 50-60 km to the top of the deep partial melt zone at about 90 km.

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