The geochemistry of basalt-sea-water interactions: evidence from)eception Island, Antarctica

• Main Authors: Reykjanes Iceland, H. Elderfield, E. Gunnlaugsson, S. J. Wakefield, P. T. Williams
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Deception Island; Reykjanes; Antarc*; Antarctica
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.604.2523; http://www.minersoc.org/pages/Archive-MM/Volume_41/41-318-217.pdf

SUMMARY. Sea-water f om Deception Island was found to contain o'55-I'48 mg Mn 1-1 and IO'2-64"3 mg Si 1-1. Reaction of Deception Island basalt and sea-water at 19o ~ and 5oo bars simulated the measured water composition but leaching experiments suggest that much of the Mn etc. may derive from local volcanic ash. Mn and Mg in thermal waters at Reykjanes have concentrations compatible with equilibrium with components of montmorillonite present as an alteration mineral of average composition Ca0.~6 Na0.33 K0.03 (AIH8 l~III ~0.35 II Mno.oi Mgl.2s) [Si8.17 Alo.sa] Olo(OH)2~2'55 H~O. However, Fe is controlled by equilibrium with sulphides. Fe0.az Flux calculations based on these and other data place upper limits on hydrothermal Mn input to the oceans