Crustal thickness and the average depth and degree of melting in fractional melting models of passive flow beneath mid-ocean ridges

Details Crustal thickness and the average depth and degree of melting in fractional melting models of passive flow beneath mid-ocean ridges Crustal thickness and the average depth and degree of melting in fractional melting models of passive flow beneath mid-ocean ridges

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9816073f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. B9, p. 16,073-16,079.

Physics

25

Basalt, Earth Crust, Earth Mantle, Melting, Ocean Bottom, Earth Planetary Structure, Geotemperature, Mathematical Models

Scientific paper

In simple models of passive flow beneath mid-ocean ridges, fractional melting of the upwelling mantle produces unexpected relationships among crustal thickness, degree of partial melting, and the average depth of melting. If the degree of melting is estimated on the basis of basalt composition, then the average degree of melting is one-third the maximum degree of melting and the average depth of melting is about two-thirds the maximum depth in the simplest models. The crustal thickness is about 1.5 times the product of the average fraction of melting and the height of the melting column. If the average degree of melting represented in mid-ocean ridge basalts were 10 percent and melt production continued to the base of the crust, then only a 40-km-high residual melting column would be required to produce a 6-km-thick crust. In more realistic models, melting beginning at 60 km below the base of the crust and continuing to the top of the mantle would produce a 6-km-thick crust with average degree of melting of 6.67 percent or melting beginning at 67 km and ending at 30 km below the base of the crust would produce a 6-km-thick crust with an average degree of melting of only about 5.4 percent.

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