The importance of shallow hydrothermal island arc systems in ocean biogeochemistry

Hawkes, Jeffrey A.; Connelly, Douglas P.; Rijkenberg, Micha J.A.; Achterberg, Eric P.. 2014 The importance of shallow hydrothermal island arc systems in ocean biogeochemistry. Geophysical Research Letters, 41 (3). 942-947.

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Hydrothermal venting often occurs at submarine volcanic calderas on island arc chains, typically at shallower depths than mid–ocean ridges. The effect of these systems on ocean biogeochemistry has been under-investigated to date. Here we show that hydrothermal effluent from an island arc caldera was rich in Fe(III) colloids (0.02–0.2 µm; 46% of total Fe), contributing to a fraction of hydrothermal Fe that was stable in ocean water. Iron(III) colloids from island arc calderas may be transferred into surrounding waters (generally 0–1500 m depth) by ocean currents, thereby potentially stimulating surface ocean primary productivity. Hydrothermal Fe oxyhydroxide particles (>0.2 µm) were also pervasive in the studied caldera and contained high concentrations of oxyanions of phosphorus (P), vanadium (V), arsenic (As), and manganese (Mn). Hydrothermal island arcs may be responsible for > 50% of global hydrothermal P scavenging and > 40% V scavenging, despite representing <10% of global hydrothermal fluid flow.

Item Type: Publication - Article
Digital Object Identifier (DOI):
ISSN: 00948276
Date made live: 19 Feb 2014 11:20 +0 (UTC)

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