Relationship of pore water freshening to accretionary processes in the Cascadia margin: Fluid sources and gas hydrate abundance

Details Relationship of pore water freshening to accretionary processes in the Cascadia margin: Fluid sources and gas hydrate abundance Relationship of pore water freshening to accretionary processes in the Cascadia margin: Fluid sources and gas hydrate abundance

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3122305t&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 22, CiteID L22305

Mathematics

Logic

10

Geochemistry: Isotopic Composition/Chemistry, Oceanography: Biological And Chemical: Colloids, Oceanography: Biological And Chemical: Geochemistry, Tectonophysics: Plate Boundary-General (3040)

Scientific paper

Drilling in the Cascadia accretionary complex enable us to evaluate the contribution of dehydration reactions and gas hydrate dissociation to pore water freshening. The observed freshening with depth and distance from the prism toe is consistent with enhanced conversion of smectite to illite, driven by increase in temperature and age of accreted sediments. Although they contain gas hydrate -as evidenced by discrete low chloride spikes- the westernmost sites drilled on Hydrate Ridge show no freshening trend with depth. Strontium data reveal that all the mélange samples contain deep fluids modified by reaction with the subducting oceanic crust. Thus we infer that, at the westernmost sites, accretion is too recent for the sediments to have undergone significant illitization. Our data demonstrate that a smooth decrease in dissolved chloride with depth cannot generally be used to infer the presence or to estimate the amount of gas hydrate in accretionary margins.

Affiliated with

Also associated with

No associations

Rating

Relationship of pore water freshening to accretionary processes in the Cascadia margin: Fluid sources and gas hydrate abundance does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Relationship of pore water freshening to accretionary processes in the Cascadia margin: Fluid sources and gas hydrate abundance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Relationship of pore water freshening to accretionary processes in the Cascadia margin: Fluid sources and gas hydrate abundance will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1762938