Bound water content of the lower oceanic crust estimated from modal analyses and seismic velocities of oceanic diabase and gabbro

Details Bound water content of the lower oceanic crust estimated from modal analyses and seismic velocities of oceanic diabase and gabbro Bound water content of the lower oceanic crust estimated from modal analyses and seismic velocities of oceanic diabase and gabbro

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30vsde2c&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 22, pp. SDE 2-1, CiteID 2142, DOI 10.1029/2003GL018213

Physics

4

Physical Properties Of Rocks: Acoustic Properties, Physical Properties Of Rocks: General Or Miscellaneous, Seismology: Oceanic Crust

Scientific paper

Hydrous minerals in the oceanic crust are known to carry bound water into subduction zones, but the water content of the lower oceanic crust is poorly constrained. Previous studies suggest that lower crustal diabases and gabbros contain 1-3 and 1-2 wt% H2O. This analysis, based on the modal mineralogy and seismic properties of oceanic diabase and gabbro samples, shows that the H2O content of diabase dike rocks ranges from 1-3%, with an average of 1.5% in oceanic gabbros, the H2O content decreases with increasing seismic velocity, and gabbros that have velocities typical of the lower oceanic crust (6.7-7.0 km s-1) contain 0.2 to 0.7 wt% H2O, with a mean near 0.5 wt%.

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