PMEL Publications Abstract

FY 2000

The water-column chemical signature after the 1998 eruption of Axial Volcano

Resing, J.A., R.A. Feely, G.J. Massoth, and E.T. Baker

Geophys. Res. Lett., 26(24), 3645–3648 (1999)

The eruption of Axial Volcano in January 1998 produced extensive plumes in the overlying water column with large anomalies in Fe, Mn, pH, light attenuation, and temperature. A strong correlation between total iron and light attenuation (dc) suggests a low abundance of particulate sulfur (PS) in the plumes. Because total carbon dioxide (

) samples were not collected, high-precision pH measurements were used to estimate maximum CO

anomalies (

) which, when compared to the other physical and chemical data, suggest that the fluids being vented 3 weeks after eruption were formed by the interaction between an intruded dike and a mixture of interstitial seawater and mature hydrothermal fluids.

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