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Figure 9.6. ( cont. )
of hornblende in comparison with augite and olivine in the gabbros which make
up layer 3. This interpretation is not the only solution: the low velocities could
also be produced by fluid-filled pores.
In a major two-ship multichannel seismic experiment, the North Atlantic Tran-
sect, some 4000 km of reflection data were collected between the east coast of
the U.S.A. at 32 N and the Mid-Atlantic Ridge at 23 N. Along much of the
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