Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..426s&link_type=abstract
Geophysical Research Letters, vol. 5, June 1978, p. 426-428.
Physics
8
Basalt, Earth Crust, Magma, Ocean Bottom, Ridges, Fractionation, Heat Balance, Igneous Rocks, Liquid Phases, Melting Points, Volcanology
Scientific paper
Based on studies of ophiolitic complexes, a characterization of basaltic magmas at midocean ridges is proposed. A thin molten region about 3 km wide probably exists at the top of the magma chamber; primitive material enters the uppermost part of the chamber from below, and fractionated material is removed by the upward extrusion of dikes and settling of crystals to form a mush which probably fills the bulk of the chamber. The roof of the magma chamber is probably cooler than the melting temperature of primitive basalt. Secondary melts and the volume of the uppermost molten region are considered. Weaknesses along the line of dike intrusion and limited plating of material onto the roof of the chamber may restrict dike intrusion to the exceeding narrow zone inferred from ophiolitic complexes.
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