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Seismic structure of the oceanic crust from deep drilling on the Mid‐Atlantic Ridge
Author(s) -
Hyndman R. D.,
Aumento F.,
Melson W. G.,
Hall J. M.,
Bougault H.,
Dmitriev L.,
Fisher J. F.,
Flower M.,
Howe R. C.,
Miles G. A.,
Robinson P. T.,
Wright T. L.
Publication year - 1976
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl003i003p00201
Subject(s) - geology , drilling , crust , oceanic crust , ridge , basement , mid atlantic ridge , basalt , mid ocean ridge , volcano , seismic velocity , seismology , geochemistry , deep sea , petrology , subduction , paleontology , oceanography , tectonics , mechanical engineering , engineering , civil engineering
Five deep crustal holes were drilled into the Mid‐Atlantic Ridge near 37°N by Glomar Challenger on Leg 37 of the Deep Sea Drilling Project. The drilling results and laboratory measurements of seismic velocity on samples from one hole of over 500 m into basement have shown that the low velocity upper crustal layer 2a consists of interlayered solid basalt and shattered and fractured volcanic material with extensive large scale porosity and voids and some intercalated sediments. Gabbros and serpentinites with velocity appropriate for the lower crust were recovered from another hole.