Carbon and hydrogen isotope constraints on degassing of CO2 and H2O in submarine lavas from the Pitcairn hotspot (South Pacific)

Details Carbon and hydrogen isotope constraints on degassing of CO2 and H2O in submarine lavas from the Pitcairn hotspot (South Pacific) Carbon and hydrogen isotope constraints on degassing of CO2 and H2O in submarine lavas from the Pitcairn hotspot (South Pacific)

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3302308a&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 2, CiteID L02308

Physics

5

Geochemistry: Composition Of The Mantle, Geochemistry: Geochemical Cycles (0330), Geochemistry: Intra-Plate Processes (3615, 8415), Geochemistry: Radiogenic Isotope Geochemistry, Geochemistry: Major And Trace Element Geochemistry

Scientific paper

The analysis of CO2-δ13C-H2O-δD in vesicles of 35 submarine volcanic glasses reveals that open-system degassing, following closed-system degassing, is responsible for the observed variations in volatile concentration and isotopic ratios. The least degassed samples allow the assessment of minimum estimates for the flux of CO2 and H2O from the Pitcairn hotspot: 2.24 +/- 0.17 104 tons C yr-1 and 1.32 +/- 0.82 105 tons H2O yr-1. The results also suggest that the carbon in the source of the Pitcairn hotspot may have a δ13C value around -6‰, 2‰ lower than the source of mid-ocean ridge basalts. This indicates either a possible contribution from the lower mantle or the possible involvement of decarbonated recycled materials with an unusual carbon isotopic signature.

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