The geochemistry of basalt-sea-water interactions: evidence from)eception Island, Antarctica
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. ma...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Subjects: | |
| 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: | 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 |
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