The in situ pH of hydrothermal fluids at mid-ocean ridges

Details The in situ pH of hydrothermal fluids at mid-ocean ridges The in situ pH of hydrothermal fluids at mid-ocean ridges

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005e%26psl.237..167d&link_type=abstract

Earth and Planetary Science Letters, Volume 237, Issue 1-2, p. 167-174.

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Scientific paper

Here we report the first in situ pH of hydrothermal vent fluids at mid-ocean ridges. Measurements were made during dives with DSV Alvin to the Main Endeavour Field (Juan de Fuca Ridge) and the East Pacific Rise at 21°N, and 9°-10°N using solid-state electrochemical sensors. Vent fluid temperature and pressure ranged from 180 to 384 °C and 220 to 250 bar, respectively. pH(in situ) of the highest temperature vent fluid is only slightly acidic (5.1-5.4), although sharply lower values occur at the seawater/vent-fluid interface. Knowledge of pH(in situ) is essential for unravelling the complex geochemical and biogeochemical processes controlling the evolution of seafloor hydrothermal systems.

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