Physics – Geophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3979c&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 20, p. 3979-3982
Physics
Geophysics
4
Exploration Geophysics: Oceanic Structures, Geochemistry: Composition Of The Crust, Physical Properties Of Rocks: Acoustic Properties, Seismology: Oceanic Crust
Scientific paper
A 0.4 to 0.5 s-1 in situ vertical velocity gradient in the diabase dike section of DSDP/ODP Hole 504B has been attributed to the effects of increasing pressure and downhole changes of mineralogy caused by hydrothermal alteration. An analysis of velocities measured in diabase samples as a function of pressure shows that increasing pressure accounts for a gradient of at most 0.1 s-1. Neither laboratory data nor a Voigt-Reuss-Hill average velocity model in which Vppyx>Vp amph shows a significant variation of velocity with depth; composition and pressure combined account for a gradient not greater than 0.2 s-1. These results indicate that either the elastic moduli of the amphibole minerals in these rocks are higher than those of the pyroxene phase (Vpamph>Vppyx,) or the seismic properties of the dikes are affected by a network of thin, large-scale cracks.
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