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Data report: trace element, Sr isotope, and Ge/Si composition of fluids and sediments in ridge-flank low-temperature hydrothermal environments

Data report: trace element, Sr isotope, and Ge/Si composition of fluids and sediments in ridge-flank low-temperature hydrothermal environments
Data report: trace element, Sr isotope, and Ge/Si composition of fluids and sediments in ridge-flank low-temperature hydrothermal environments
The data presented in this report demonstrate significant improvements in the ability to constrain trace element and Sr isotopic concentrations in sediments overlying ridge-flank hydrothermal systems. Improved sampling methods orchestrated by the Integrated Ocean Drilling Program (i.e., advanced piston coring and anoxic sample processing) enabled the collection of reactive pore water species with minimal alteration and sampling artifacts. Improved methods of high-resolution inductively coupled plasma–mass spectrometry trace element analysis, including the use of the 8-hydroxyquinoline functional group to extract and preconcentrate rare earth elements and other trace metals, were used to compile a data set of 28 trace element concentrations and 87Sr/86Sr ratios. From this extensive data set, we were able to increase the current understanding of how redox-reactive species respond to diagenic processes. Near-basement trends were used in combination with the known composition of hydrothermal fluids that exit Baby Bare Springs to asses our ability to predict basement fluid compositions using sediment pore water profiles collected by deep-sea drilling. The results show that prediction of basement fluid composition is possible for many trace elements, provided the near-basement concentration gradients are minimal. In order to place the Ge/Si systematics in a broader context, pore water and borehole fluid Ge and Si data are presented from additional sites across the Juan de Fuca Ridge flank and from two additional ridge-flank settings. These data show that Ge concentrations and Ge/Si ratios are much higher in the basement fluids than in the basal sediments because of increased mobilization of Ge relative to Si within the basement hydrothermal reservoir. Solid-phase sediment data are presented, highlighted by the occurrence of Mn- and carbonate-rich layers.

International Ocean Drilling Project
Hulme, S.M.
3b0ed64e-2230-499b-94f5-4abaca97f530
Wheat, C.G.
5f3f9a16-b2f2-47ca-bbfc-7aaca876f186
Coggon, R.M.
09488aad-f9e1-47b6-9c62-1da33541b4a4
McManus, J.
1ce61906-c1fa-436c-99b6-3c8ed3c2e09a
Fisher, A.T.
Urabe, T.
Klause, A.
Hulme, S.M.
3b0ed64e-2230-499b-94f5-4abaca97f530
Wheat, C.G.
5f3f9a16-b2f2-47ca-bbfc-7aaca876f186
Coggon, R.M.
09488aad-f9e1-47b6-9c62-1da33541b4a4
McManus, J.
1ce61906-c1fa-436c-99b6-3c8ed3c2e09a
Fisher, A.T.
Urabe, T.
Klause, A.

Hulme, S.M., Wheat, C.G., Coggon, R.M. and McManus, J. (2008) Data report: trace element, Sr isotope, and Ge/Si composition of fluids and sediments in ridge-flank low-temperature hydrothermal environments. Fisher, A.T., Urabe, T. and Klause, A. (eds.) In Proceedings of the IODP, Volume 301. International Ocean Drilling Project. 17 pp . (doi:10.2204/iodp.proc.301.202.2008).

Record type: Conference or Workshop Item (Paper)

Abstract

The data presented in this report demonstrate significant improvements in the ability to constrain trace element and Sr isotopic concentrations in sediments overlying ridge-flank hydrothermal systems. Improved sampling methods orchestrated by the Integrated Ocean Drilling Program (i.e., advanced piston coring and anoxic sample processing) enabled the collection of reactive pore water species with minimal alteration and sampling artifacts. Improved methods of high-resolution inductively coupled plasma–mass spectrometry trace element analysis, including the use of the 8-hydroxyquinoline functional group to extract and preconcentrate rare earth elements and other trace metals, were used to compile a data set of 28 trace element concentrations and 87Sr/86Sr ratios. From this extensive data set, we were able to increase the current understanding of how redox-reactive species respond to diagenic processes. Near-basement trends were used in combination with the known composition of hydrothermal fluids that exit Baby Bare Springs to asses our ability to predict basement fluid compositions using sediment pore water profiles collected by deep-sea drilling. The results show that prediction of basement fluid composition is possible for many trace elements, provided the near-basement concentration gradients are minimal. In order to place the Ge/Si systematics in a broader context, pore water and borehole fluid Ge and Si data are presented from additional sites across the Juan de Fuca Ridge flank and from two additional ridge-flank settings. These data show that Ge concentrations and Ge/Si ratios are much higher in the basement fluids than in the basal sediments because of increased mobilization of Ge relative to Si within the basement hydrothermal reservoir. Solid-phase sediment data are presented, highlighted by the occurrence of Mn- and carbonate-rich layers.

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Published date: 15 February 2008
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 347889
URI: http://eprints.soton.ac.uk/id/eprint/347889
PURE UUID: a36be098-8c97-4826-b28d-dbc4e4c3f136
ORCID for R.M. Coggon: ORCID iD orcid.org/0000-0002-9228-9707

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Date deposited: 01 Feb 2013 15:11
Last modified: 24 May 2019 00:31

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Contributors

Author: S.M. Hulme
Author: C.G. Wheat
Author: R.M. Coggon ORCID iD
Author: J. McManus
Editor: A.T. Fisher
Editor: T. Urabe
Editor: A. Klause

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