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Patterns of (trace) metals and microorganisms in the Rainbow hydrothermal vent plume at the Mid-Atlantic Ridge

Patterns of (trace) metals and microorganisms in the Rainbow hydrothermal vent plume at the Mid-Atlantic Ridge
Patterns of (trace) metals and microorganisms in the Rainbow hydrothermal vent plume at the Mid-Atlantic Ridge
Hydrothermal vent fields found at mid-ocean ridges emit hydrothermal fluids that disperse as neutrally buoyant plumes. From these fluids seafloor massive sulfides (SMS) deposits are formed, which are being explored as possible new mining sites for (trace) metals and rare earth elements (REEs). It has been suggested that during mining activities large amounts of suspended matter will appear in the water column due to excavation processes and discharge of mining waste from the surface vessel. Understanding how hydrothermal plumes can be characterised by means of geochemistry and microbiology as they spread away from their source and how they affect their surrounding environment may help in characterising the behaviour of the dilute distal part of chemically enriched mining plumes.

This study on the extensive Rainbow hydrothermal plume, observed up to 25 km downstream from the vent site, enabled us to investigate how microbial communities and (trace) metal composition change in a natural plume with distance. The (trace) metal and REE content of suspended particulate matter (SPM) was determined using sector field inductively coupled plasma mass spectrometry (SF-ICP-MS) with high resolution (HR), and the microbial communities of the neutrally buoyant plume, above-plume, below-plume, and near-bottom water and sediment were characterised by using 16S rRNA amplicon sequencing methods. Both vertically in the water column and horizontally along the neutrally buoyant plume, geochemical and biological changes were evident, as the neutrally buoyant plume stood out by its enrichments in (trace) metals and REEs, as, for example, Fe, Cu, V, Mn and REEs were enriched by factors of up to ∼80, ∼90, ∼52, ∼2.5 and ∼40, respectively, compared to above-plume water samples taken at 1000 m water depth. The concentrations of these elements changed as the plume aged, shown by the decrease in element ∕ Fe molar ratios of chalcophile elements (Cu, Co, Zn), indicative of rapid removal from the hydrothermal plume or removal from the solid phase. Conversely, increasing REE ∕ Fe molar ratios imply uptake of REEs from the ambient seawater onto Fe-oxyhydroxides. This was also reflected in the background pelagic system, as Epsilonproteobacteria started to dominate and univariate microbial biodiversity declined with distance away from the Rainbow hydrothermal vent field. The Rainbow hydrothermal plume provides a geochemically enriched natural environment, which is a heterogeneous, dynamic habitat that is conducive to ecological changes in a short time span. This study of a hydrothermal plume provides a baseline study to characterise the natural plume before the interference of deep-sea mining.
1726-4170
2499-2519
Haalboom, Sabine
285fdefa-ce4a-43c1-a960-1e59020b496c
Price, David M.
c11f35a9-77b0-4589-95dd-79fb79872912
Mienis, Furu
ac616471-82c0-4757-bee9-8906ea95ac66
Van Bleijswijk, Judith D. L.
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De Stigter, Henko C.
331d4b64-91d8-451a-a65a-60436fcdf70d
Witte, Harry J.
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Reichart, Gert-jan
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Duineveld, Gerard C. A.
61f90116-e45f-4c6c-9dc6-ed03d5d6edd4
Haalboom, Sabine
285fdefa-ce4a-43c1-a960-1e59020b496c
Price, David M.
c11f35a9-77b0-4589-95dd-79fb79872912
Mienis, Furu
ac616471-82c0-4757-bee9-8906ea95ac66
Van Bleijswijk, Judith D. L.
b4de87ec-4728-4a7a-809a-0149959e22cf
De Stigter, Henko C.
331d4b64-91d8-451a-a65a-60436fcdf70d
Witte, Harry J.
3e058320-789e-4d58-ad94-f5c82f0212bc
Reichart, Gert-jan
f56639e3-dd16-4dfc-941e-d55302ef9ee5
Duineveld, Gerard C. A.
61f90116-e45f-4c6c-9dc6-ed03d5d6edd4

Haalboom, Sabine, Price, David M., Mienis, Furu, Van Bleijswijk, Judith D. L., De Stigter, Henko C., Witte, Harry J., Reichart, Gert-jan and Duineveld, Gerard C. A. (2020) Patterns of (trace) metals and microorganisms in the Rainbow hydrothermal vent plume at the Mid-Atlantic Ridge. Biogeosciences, 17 (9), 2499-2519. (doi:10.5194/bg-17-2499-2020).

Record type: Article

Abstract

Hydrothermal vent fields found at mid-ocean ridges emit hydrothermal fluids that disperse as neutrally buoyant plumes. From these fluids seafloor massive sulfides (SMS) deposits are formed, which are being explored as possible new mining sites for (trace) metals and rare earth elements (REEs). It has been suggested that during mining activities large amounts of suspended matter will appear in the water column due to excavation processes and discharge of mining waste from the surface vessel. Understanding how hydrothermal plumes can be characterised by means of geochemistry and microbiology as they spread away from their source and how they affect their surrounding environment may help in characterising the behaviour of the dilute distal part of chemically enriched mining plumes.

This study on the extensive Rainbow hydrothermal plume, observed up to 25 km downstream from the vent site, enabled us to investigate how microbial communities and (trace) metal composition change in a natural plume with distance. The (trace) metal and REE content of suspended particulate matter (SPM) was determined using sector field inductively coupled plasma mass spectrometry (SF-ICP-MS) with high resolution (HR), and the microbial communities of the neutrally buoyant plume, above-plume, below-plume, and near-bottom water and sediment were characterised by using 16S rRNA amplicon sequencing methods. Both vertically in the water column and horizontally along the neutrally buoyant plume, geochemical and biological changes were evident, as the neutrally buoyant plume stood out by its enrichments in (trace) metals and REEs, as, for example, Fe, Cu, V, Mn and REEs were enriched by factors of up to ∼80, ∼90, ∼52, ∼2.5 and ∼40, respectively, compared to above-plume water samples taken at 1000 m water depth. The concentrations of these elements changed as the plume aged, shown by the decrease in element ∕ Fe molar ratios of chalcophile elements (Cu, Co, Zn), indicative of rapid removal from the hydrothermal plume or removal from the solid phase. Conversely, increasing REE ∕ Fe molar ratios imply uptake of REEs from the ambient seawater onto Fe-oxyhydroxides. This was also reflected in the background pelagic system, as Epsilonproteobacteria started to dominate and univariate microbial biodiversity declined with distance away from the Rainbow hydrothermal vent field. The Rainbow hydrothermal plume provides a geochemically enriched natural environment, which is a heterogeneous, dynamic habitat that is conducive to ecological changes in a short time span. This study of a hydrothermal plume provides a baseline study to characterise the natural plume before the interference of deep-sea mining.

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Accepted/In Press date: 16 March 2020
Published date: 12 May 2020

Identifiers

Local EPrints ID: 444426
URI: http://eprints.soton.ac.uk/id/eprint/444426
ISSN: 1726-4170
PURE UUID: 09e99efa-e53a-44a1-aff4-eb9cb6043614

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Date deposited: 19 Oct 2020 16:31
Last modified: 25 Nov 2021 21:07

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Contributors

Author: Sabine Haalboom
Author: David M. Price
Author: Furu Mienis
Author: Judith D. L. Van Bleijswijk
Author: Henko C. De Stigter
Author: Harry J. Witte
Author: Gert-jan Reichart
Author: Gerard C. A. Duineveld

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