The University of Southampton
University of Southampton Institutional Repository
Warning ePrints Soton is experiencing an issue with some file downloads not being available. We are working hard to fix this. Please bear with us.

Hydrothermal plume - particle fluxes at 13N on the East Pacific Rise

Hydrothermal plume - particle fluxes at 13N on the East Pacific Rise
Hydrothermal plume - particle fluxes at 13N on the East Pacific Rise
We have investigated the geochemical flux to sediment traps deployed close to the Totem vent site, 13°N EPR. An important emphasis has been to investigate what proportion of this settling flux derives from direct co-precipitation of vent-fluid material as polymetallic sulphides and what proportion is in the form of Fe oxyhydroxide material which not only co-precipitates vent-fluid metals but can also scavenge dissolved material from seawater. Mass fluxes and major element compositions (Fe, S, Al, Mn, CaCO3 and Corg) for our near vent samples compare well with results from previously reported Pacific hydrothermal sediment trap studies, both at this site and on the Endeavour Ridge. Our samples record large fluxes of Cu, Zn and Pb, as well as V and P, all of which are in excess over typical open-ocean trap values. If P and V are transported to the traps as sinking Fe-oxyhydroxide material from the neutrally buoyant plume, we calculate that 10–20% of the Fe entering the near vent traps occurs as oxidised material with the remaining 80–90% being supplied by polymetallic sulphides. Shale-normalised REE distribution patterns for near-vent trap samples are similar to those for local vent fluids and sulphidic sediments. Detailed mass balance calculations, however, reveal evidence for additional input from hydrothermal Fe-oxyhydroxide material with a scavenged REE composition that is less "evolved" than that reported for local neutrally buoyant plume particles. U fluxes into the near vent traps are high and consistent with uptake by sulphides. 210Pb fluxes are also high and appear dominated by co-precipitation direct from vent-fluids as Pb-sulphides. In contrast, Fe-oxyhydroxide scavenging from seawater can account for the entire 230Th and 232Th fluxes reported. If the scavenging processes identified here were similarly active in neutrally buoyant plumes, we would predict hydrothermal scavenging to impact ocean biogeochemical cycles significantly, e.g. causing removal of ca. 10% of the dissolved 230Th production from the deep water column, out to a distance of ca. 10–100 km off-axis, along the entire 60,000 km global ridge-crest.
HYDROTHERMAL ACTIVITY, HYDROTHERMAL SPRINGS, HYDROTHERMAL SOLUTIONS, GEOCHEMISTRY, EAST PACIFIC RISE, GEOLOGY
0967-0637
1921-1940
German, C.R.
cd0eedd5-1377-4182-9c8a-b06aef8c1069
Colley, S.
88501fc1-b0de-494c-9c55-a4940abf327f
Palmer, M.R.
d2e60e81-5d6e-4ddb-a243-602537286080
Khripounoff, A.
8b61bb1d-149d-4f6e-9f25-7272dc52559e
Klinkhammer, G.P.
8b523c27-0153-43eb-a91e-5568146180ae
German, C.R.
cd0eedd5-1377-4182-9c8a-b06aef8c1069
Colley, S.
88501fc1-b0de-494c-9c55-a4940abf327f
Palmer, M.R.
d2e60e81-5d6e-4ddb-a243-602537286080
Khripounoff, A.
8b61bb1d-149d-4f6e-9f25-7272dc52559e
Klinkhammer, G.P.
8b523c27-0153-43eb-a91e-5568146180ae

German, C.R., Colley, S., Palmer, M.R., Khripounoff, A. and Klinkhammer, G.P. (2002) Hydrothermal plume - particle fluxes at 13N on the East Pacific Rise. Deep Sea Research Part I: Oceanographic Research Papers, 49 (11), 1921-1940. (doi:10.1016/S0967-0637(02)00086-9).

Record type: Article

Abstract

We have investigated the geochemical flux to sediment traps deployed close to the Totem vent site, 13°N EPR. An important emphasis has been to investigate what proportion of this settling flux derives from direct co-precipitation of vent-fluid material as polymetallic sulphides and what proportion is in the form of Fe oxyhydroxide material which not only co-precipitates vent-fluid metals but can also scavenge dissolved material from seawater. Mass fluxes and major element compositions (Fe, S, Al, Mn, CaCO3 and Corg) for our near vent samples compare well with results from previously reported Pacific hydrothermal sediment trap studies, both at this site and on the Endeavour Ridge. Our samples record large fluxes of Cu, Zn and Pb, as well as V and P, all of which are in excess over typical open-ocean trap values. If P and V are transported to the traps as sinking Fe-oxyhydroxide material from the neutrally buoyant plume, we calculate that 10–20% of the Fe entering the near vent traps occurs as oxidised material with the remaining 80–90% being supplied by polymetallic sulphides. Shale-normalised REE distribution patterns for near-vent trap samples are similar to those for local vent fluids and sulphidic sediments. Detailed mass balance calculations, however, reveal evidence for additional input from hydrothermal Fe-oxyhydroxide material with a scavenged REE composition that is less "evolved" than that reported for local neutrally buoyant plume particles. U fluxes into the near vent traps are high and consistent with uptake by sulphides. 210Pb fluxes are also high and appear dominated by co-precipitation direct from vent-fluids as Pb-sulphides. In contrast, Fe-oxyhydroxide scavenging from seawater can account for the entire 230Th and 232Th fluxes reported. If the scavenging processes identified here were similarly active in neutrally buoyant plumes, we would predict hydrothermal scavenging to impact ocean biogeochemical cycles significantly, e.g. causing removal of ca. 10% of the dissolved 230Th production from the deep water column, out to a distance of ca. 10–100 km off-axis, along the entire 60,000 km global ridge-crest.

This record has no associated files available for download.

More information

Published date: 2002
Keywords: HYDROTHERMAL ACTIVITY, HYDROTHERMAL SPRINGS, HYDROTHERMAL SOLUTIONS, GEOCHEMISTRY, EAST PACIFIC RISE, GEOLOGY

Identifiers

Local EPrints ID: 2082
URI: http://eprints.soton.ac.uk/id/eprint/2082
ISSN: 0967-0637
PURE UUID: 87b2e3a9-8a29-4b75-b9b9-ec42f1a727ad

Catalogue record

Date deposited: 11 May 2004
Last modified: 25 Nov 2021 22:17

Export record

Altmetrics

Contributors

Author: C.R. German
Author: S. Colley
Author: M.R. Palmer
Author: A. Khripounoff
Author: G.P. Klinkhammer

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 http://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.

×