Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 57.

This volume is an outgrowth of IUGG Union Symposium 9 held during the 1987 IUGG General Assembly at Vancouver, Canada. This symposium, jointly sponsored by IAVCEI, IASPEI, ICL and IAGA, consisted of 31 presentations ranging in subject matter from melt segregation and melt focusing processes beneath mid-ocean ridges, to the structures of oceanic crust and ophiolite analogues, morphological variations in the accretion process, the structural evolution of specific spreading ridge systems, the interplay between magmatism and rifting, and the chemical and thermal balances involved in mid-ocean ridge hydrothermal systems. Six of those papers have been expanded in the present volume.

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