Isotopic evidence of magmatism and seawater bicarbonate removal at the endeavour hydrothermal system

Details Isotopic evidence of magmatism and seawater bicarbonate removal at the endeavour hydrothermal system Isotopic evidence of magmatism and seawater bicarbonate removal at the endeavour hydrothermal system

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004e%26psl.225...53p&link_type=abstract

Earth and Planetary Science Letters, Volume 225, Issue 1-2, p. 53-61.

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4

Carbon Dioxide, Hydrothermal Vents, Radiocarbon, Bicarbonate, Endeavour

Scientific paper

Stable and radiocarbon isotope measurements made on CO2 from high temperature hydrothermal vents on the Endeavour Segment of the Juan de Fuca Ridge indicate a magmatic source of carbon to the hydrothermal system after a 1999 earthquake. The radiocarbon measurements require that a large fraction of seawater bicarbonate originally present in the downwelled fluid be removed during hydrothermal circulation. The Endeavour Segment is devoid of overlying sediments and has shown no observable signs of surficial magmatic activity during the previous 20 years of ongoing studies. The appearance of isotopically heavy, radiocarbon dead CO2 after a 1999 earthquake swarm indicate that this earthquake event was magmatic in origin. Evidence for the removal of seawater bicarbonate is a significant find because many studies to date have corrected CO2 data based on the presumption of the presence of seawater bicarbonate. Utilizing both stable and radiocarbon measurements there is some evidence of a sedimentary source of carbon at Endeavour. These findings, which represent the first temporally coherent set of radiocarbon measurements from hydrothermal vent fluids, demonstrate the utility of radiocarbon analysis in hydrothermal studies.

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