The importance of shallow hydrothermal island arc systems in ocean biogeochemistry

Hawkes, Jeffrey A., Connelly, Douglas P., Rijkenberg, Micha J. A. and Achterberg, Eric P. (2014) The importance of shallow hydrothermal island arc systems in ocean biogeochemistry Geophysical Research Letters, 41 (3). pp. 942-947. DOI 10.1002/2013GL058817.

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Abstract

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.

Document Type: Article
Keywords: iron; hydrothermal; colloid; island arc; scavenging; caldera
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Kiel University
Refereed: Yes
DOI etc.: 10.1002/2013GL058817
ISSN: 0094-8276
Date Deposited: 22 Sep 2014 11:29
Last Modified: 24 May 2017 11:53
URI: http://eprints.uni-kiel.de/id/eprint/25621

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