The University of Southampton
University of Southampton Institutional Repository

The distribution and stabilisation of dissolved Fe in deep-sea hydrothermal plumes

The distribution and stabilisation of dissolved Fe in deep-sea hydrothermal plumes
The distribution and stabilisation of dissolved Fe in deep-sea hydrothermal plumes
We have conducted a study of hydrothermal plumes overlying the Mid-Atlantic Ridge near 5° S to investigate whether there is a significant export flux of dissolved Fe from hydrothermal venting to the oceans. Our study combined measurements of plume-height Fe concentrations from a series of 6 CTD stations together with studies of dissolved Fe speciation in a subset of those samples. At 2.5 km down plume from the nearest known vent site dissolved Fe concentrations were 20 nM. This is much higher than would be predicted from a combination of plume dilution and dissolved Fe(II) oxidation rates, but consistent with stabilisation due to the presence of organic Fe complexes and Fe colloids. Using Competitive Ligand Exchange–Cathodic Stripping Voltammetry (CLE–CSV), stabilised dissolved Fe complexes were detected within the dissolved Fe fraction on the edges of one non-buoyant hydrothermal plume with observed ligand concentrations high enough to account for stabilisation of 4% of the total Fe emitted from the 5° S vent sites. If these results were representative of all hydrothermal systems, submarine venting could provide 12–22% of the global deep-ocean dissolved Fe budget.
hydrothermal vent, iron, Fe, ligands, organic, mid-ocean ridge
0012-821X
157-167
Bennett, S.A.
c589266d-6cb6-4516-8e71-dbeb57c4ae97
Achterberg, E.P.
685ce961-8c45-4503-9f03-50f6561202b9
Connelly, D.P.
d49131bb-af38-4768-9953-7ae0b43e33c8
Statham, P.J.
51458f15-d6e2-4231-8bba-d0567f9e440c
Fones, G.R.
5b71916c-4859-4a6f-b9ad-b6b1f541cbfa
German, C.R.
cd0eedd5-1377-4182-9c8a-b06aef8c1069
Bennett, S.A.
c589266d-6cb6-4516-8e71-dbeb57c4ae97
Achterberg, E.P.
685ce961-8c45-4503-9f03-50f6561202b9
Connelly, D.P.
d49131bb-af38-4768-9953-7ae0b43e33c8
Statham, P.J.
51458f15-d6e2-4231-8bba-d0567f9e440c
Fones, G.R.
5b71916c-4859-4a6f-b9ad-b6b1f541cbfa
German, C.R.
cd0eedd5-1377-4182-9c8a-b06aef8c1069

Bennett, S.A., Achterberg, E.P., Connelly, D.P., Statham, P.J., Fones, G.R. and German, C.R. (2008) The distribution and stabilisation of dissolved Fe in deep-sea hydrothermal plumes. Earth and Planetary Science Letters, 270 (3-4), 157-167. (doi:10.1016/j.epsl.2008.01.048).

Record type: Article

Abstract

We have conducted a study of hydrothermal plumes overlying the Mid-Atlantic Ridge near 5° S to investigate whether there is a significant export flux of dissolved Fe from hydrothermal venting to the oceans. Our study combined measurements of plume-height Fe concentrations from a series of 6 CTD stations together with studies of dissolved Fe speciation in a subset of those samples. At 2.5 km down plume from the nearest known vent site dissolved Fe concentrations were 20 nM. This is much higher than would be predicted from a combination of plume dilution and dissolved Fe(II) oxidation rates, but consistent with stabilisation due to the presence of organic Fe complexes and Fe colloids. Using Competitive Ligand Exchange–Cathodic Stripping Voltammetry (CLE–CSV), stabilised dissolved Fe complexes were detected within the dissolved Fe fraction on the edges of one non-buoyant hydrothermal plume with observed ligand concentrations high enough to account for stabilisation of 4% of the total Fe emitted from the 5° S vent sites. If these results were representative of all hydrothermal systems, submarine venting could provide 12–22% of the global deep-ocean dissolved Fe budget.

Full text not available from this repository.

More information

Published date: 30 June 2008
Keywords: hydrothermal vent, iron, Fe, ligands, organic, mid-ocean ridge
Organisations: Ocean and Earth Science, National Oceanography Centre,Southampton

Identifiers

Local EPrints ID: 52519
URI: https://eprints.soton.ac.uk/id/eprint/52519
ISSN: 0012-821X
PURE UUID: a81a9fdb-2f41-4671-9296-259bce2e2f8e

Catalogue record

Date deposited: 04 Jul 2008
Last modified: 13 Mar 2019 20:42

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×