Age dependent porosity of young upper oceanic crust: Insights from seafloor gravity studies of recent volcanic eruptions

Details Age dependent porosity of young upper oceanic crust: Insights from seafloor gravity studies of recent volcanic eruptions Age dependent porosity of young upper oceanic crust: Insights from seafloor gravity studies of recent volcanic eruptions

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29e..20p&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 5, pp. 20-1, CiteID 1076, DOI 10.1029/2001GL013977

Physics

Geophysics

2

Marine Geology And Geophysics: Gravity, Marine Geology And Geophysics: Midocean Ridge Processes, Seismology: Oceanic Crust, Tectonophysics: General Or Miscellaneous

Scientific paper

An October 1997 ALVIN program collected a series of seafloor gravity stations over the February, 1996, volcanic eruption site on the northern Gorda Ridge (46°41'N, 126°47'W). These measurements yielded estimates of the density and porosity of mid-ocean ridge crust in the first few decades following formation. The estimated crustal density for this pillow eruption of 2270 +/- 260 kg/m3 is very low, but in good agreement with the estimated densities of other recent seafloor volcanic flows. Rock matrix densities, measured from hand samples retrieved from the study area, give a bulk porosity for this flow of 34% +/- 16%. This data, when included with similar estimates of upper crustal porosity, argue for a rapid evolution of upper crustal porosities from very high values (>=30%) for recent eruptions to much lower values (~10-15%) where the seafloor is older than 0.5 million years. These variations of density and porosity are of a magnitude consistent with previously observed changes in seismic compressional wave velocity and permeability of ocean crust.

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