Diagenesis and convection reflected in pore water chemistry on the western flank of the East Pacific Rise, 20 degrees south

Details Diagenesis and convection reflected in pore water chemistry on the western flank of the East Pacific Rise, 20 degrees south Diagenesis and convection reflected in pore water chemistry on the western flank of the East Pacific Rise, 20 degrees south

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..76...71b&link_type=abstract

Earth and Planetary Science Letters, Volume 76, Issue 1-2, p. 71-83.

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Scientific paper

NO3-, PO43-, SiO2, total alkalinity (TA), Ca2+, Mg2+ and O2 were measured in seventeen in situ pore water profiles at 3 sites on the western flank of the East Pacific Rise at 20° S latitude. The top 1-2 m of the sediment was oxic at all sites. Stoichiometric modeling shows the C/N of the decomposing organic matter to be about 106/6.6 while C/P ranges from 106/0.7 to 106/0.25. The TA rise is greater than predicted by models assuming calcite saturation. suggesting that phases other than calcite are important in the alkalinity balance and control of CaCO3 saturation.
At Site III (crustal age 4.6 Myr), anomalous pore water NO3- and SiO2 profiles were observed in areas of high heat flow (and inferred upwelling of pore waters through sediments) and low heat flow (and inferred downwelling). NO3- and SiO2 profiles at the high heat flow site support the heat flow evidence for upwelling; the low heat flow NO3- and SiO2 profiles give equivocal evidence for downwelling. No hydrothermal Ca2+, Mg2+, or F- anomalies were observed in the upwelling pore waters, suggesting the absence of significant water/rock reactions during convection at this site.

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