The Origin and Evolution of the Ninetyeast Ridge

G. L. Kashintsev, Yu. P. Neprochnov, and B. N. Grin’ko

Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia

Received December 14, 1999; in final form, March 29, 2000

Abstract—The geological interpretation of seismic cross sections across the Ninetyeast Ridge allowed the oce-
anic crust to be recognized within its limits; subsequently, from the top to the bottom, it is composed of basalts,
dolerites, gabbros, and serpentinized peridotites. Seismic and gravity data suggest that the ridge represents a
fault-related structure, whose uplifting is caused by the serpentinization of peridotites. Two major stages are
distinguished in the tectonic and magmatic evolution of the ridge.

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