A North-South basin-scale full-depth section profile of dissolved Fe was realized in the Indian Ocean, as part of the first GEOTRACES Japanese cruise (Nov 2009 - Jan 2010). The data clearly show that hydrothermal Fe is distributed over 3000 km distance around a depth of ~ 3000 m, and that a large fraction of this Fe is truly dissolved. Several other sources supplying dissolved Fe to deep waters (e.g terrestrial Fe input) with a persistent condition in the oxygen minimum zone (OMZ) were also evidenced.
Jun Nishioka, Hajime Obata, Daisuke Tsumune (2013), Evidence of an extensive spread of hydrothermal dissolved iron in the Indian Ocean : Earth and Planetary Science Letters, ELSEVIER (361) p. 26-33, DOI: /10.1016/j.epsl.2012.11.040
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