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Pore-fluid Fe isotopes reflect the extent of benthic Fe redox recycling: evidence from continental shelf and deep-sea sediments

Pore-fluid Fe isotopes reflect the extent of benthic Fe redox recycling: evidence from continental shelf and deep-sea sediments
Pore-fluid Fe isotopes reflect the extent of benthic Fe redox recycling: evidence from continental shelf and deep-sea sediments
Pore-fluid Fe isotopes may be a unique tracer of sediment respiration by dissimilatory Fe reducing bacteria, but to date, pore-fluid Fe isotope measurements have been restricted to continental shelf settings. Here, we present δ56Fe values of pore fluids from two distinct sedimentary settings: (1) a riverine-dominated site on the northern California margin (Eel River shelf; 120 m water depth) and (2) biogenic opal-rich volcaniclastic deep-sea sediments from the Southern Ocean (north and south of the Crozet Plateau; 3000–4000 m water depth). The Fe isotope compositions of Crozet region pore fluids are significantly less fractionated (δ56Fe = +0.12‰ to –0.01‰) than the Eel River shelf (δ56Fe = –0.65‰ to –3.40‰) and previous studies of pore-fluid Fe isotopes, relative to average igneous rocks. Our data represent the first measurements of Fe isotope compositions in pore fluids from deep-sea sediments.
A comparison of pore-fluid δ56Fe with the relative abundance of highly labile Fe in the reactive sedimentary Fe pool demonstrates that the composition of Fe isotopes in the pore fluids reflects the different extent of sedimentary Fe redox recycling between these sites.
0091-7613
751-754
Homoky, W.B.
39da18e9-28b8-42c4-8e17-2cb66af8ee4d
Severmann, S.
2dfd58f4-d90a-41cd-8647-0ead10a5fbb6
Mills, R.A.
a664f299-1a34-4b63-9988-1e599b756706
Statham, P.J.
51458f15-d6e2-4231-8bba-d0567f9e440c
Fones, G.R.
5b71916c-4859-4a6f-b9ad-b6b1f541cbfa
Homoky, W.B.
39da18e9-28b8-42c4-8e17-2cb66af8ee4d
Severmann, S.
2dfd58f4-d90a-41cd-8647-0ead10a5fbb6
Mills, R.A.
a664f299-1a34-4b63-9988-1e599b756706
Statham, P.J.
51458f15-d6e2-4231-8bba-d0567f9e440c
Fones, G.R.
5b71916c-4859-4a6f-b9ad-b6b1f541cbfa

Homoky, W.B., Severmann, S., Mills, R.A., Statham, P.J. and Fones, G.R. (2009) Pore-fluid Fe isotopes reflect the extent of benthic Fe redox recycling: evidence from continental shelf and deep-sea sediments. Geology, 37 (8), 751-754. (doi:10.1130/G25731A.1).

Record type: Article

Abstract

Pore-fluid Fe isotopes may be a unique tracer of sediment respiration by dissimilatory Fe reducing bacteria, but to date, pore-fluid Fe isotope measurements have been restricted to continental shelf settings. Here, we present δ56Fe values of pore fluids from two distinct sedimentary settings: (1) a riverine-dominated site on the northern California margin (Eel River shelf; 120 m water depth) and (2) biogenic opal-rich volcaniclastic deep-sea sediments from the Southern Ocean (north and south of the Crozet Plateau; 3000–4000 m water depth). The Fe isotope compositions of Crozet region pore fluids are significantly less fractionated (δ56Fe = +0.12‰ to –0.01‰) than the Eel River shelf (δ56Fe = –0.65‰ to –3.40‰) and previous studies of pore-fluid Fe isotopes, relative to average igneous rocks. Our data represent the first measurements of Fe isotope compositions in pore fluids from deep-sea sediments.
A comparison of pore-fluid δ56Fe with the relative abundance of highly labile Fe in the reactive sedimentary Fe pool demonstrates that the composition of Fe isotopes in the pore fluids reflects the different extent of sedimentary Fe redox recycling between these sites.

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Published date: August 2009
Organisations: Ocean and Earth Science

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Local EPrints ID: 148815
URI: http://eprints.soton.ac.uk/id/eprint/148815
ISSN: 0091-7613
PURE UUID: d49e9a09-3e8f-40e5-b672-c3ad36aad38f
ORCID for R.A. Mills: ORCID iD orcid.org/0000-0002-9811-246X

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Date deposited: 29 Apr 2010 08:01
Last modified: 18 Feb 2021 16:42

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Contributors

Author: W.B. Homoky
Author: S. Severmann
Author: R.A. Mills ORCID iD
Author: P.J. Statham
Author: G.R. Fones

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