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OAS accession Detail for 0277879
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| accessions_id: | 0277879 | archive |
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| Title: | Sulfate reduction energetics at Main Endeavor grotto chimney from samples collected on RV Atlantis (AT18-08) during Jason II dives in the Juan de Fuca Ridge from July to August 2011 (NCEI Accession 0277879) |
| Abstract: | This dataset contains chemical data collected on R/V Atlantis during cruises AT18-08 and AT18-08_Jason_Dives in the North Pacific Ocean from 2011-01-01 to 2011-12-31. These data include dissolved organic Carbon, pH, and sulfate. The instruments used to collect these data include Dissolved Oxygen Sensor, In-situ incubator, and pH Sensor. These data were collected by Dr Peter Girguis of Harvard University and Dr Karyn Rogers of Rensselaer Polytechnic Institute as part of the "Characterization of Microbial Transformations in Basement Fluids, from Genes to Geochemical Cycling (North Pond Microbes)" and "Characterizing the distribution and rates of microbial sulfate reduction at Middle Valley hydrothermal vents (Middle Valley Vents)" projects and "Center for Dark Energy Biosphere Investigations (C-DEBI)" and "International Ocean Discovery Program (IODP)" programs. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2019-04-22. The following is the text of the dataset description provided by BCO-DMO: Sulfate reduction energetics at Main Endeavor grotto chimney. Dataset Description: The effects of key environmental variables (temperature, pH, H2S, SO42-, DOC) on sulfate reduction energetics in material recovered from a hydrothermal flange from the Grotto edifice in the Main Endeavor Field, Juan de Fuca Ridge. Sulfate reduction was measured in batch reactions across a range of physico-chemical conditions. Temperature and pH were the strongest stimuli, and maximum sulfate reduction rates were observed at 50 degrees celsius and pH 6. Information for this dataset was derived from single massive piece of hydrothermal deposit (approximately ~100 kg in weight) that was recovered from a flange on the Grotto vent (47.949, -129.098) at a depth of 2188.3 m (Dive J2-575, AT-18-08, R/V Atlantis) and brought up to the surface in the basket of the ROV Jason II. Methodology for this dataset is from: Frank et al., 2015 |
| Date received: | 20190422 |
| Start date: | 20110101 |
| End date: | 20111231 |
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| West boundary: | -129.1 |
| East boundary: | -129.1 |
| North boundary: | 47.95 |
| South boundary: | 47.95 |
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| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
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| Supplementary information: | Acquisition Description: Tables and Figures referenced in the acquisition description are found in the paper Frank et al., 2015 For each independent treatment, aliquots of 7.5 mL flange slurry (approx. 29 g wet weight and 20 g dry weight) were transferred into Balch tubes in an anaerobic chamber, and supplemented with 15 mL of sterile artificial seawater media designed to mimic the geochemical conditions within a hydrothermal flange (400 mM NaCl, 25 mM KCl, 30 mM CaCl2, 2.3 mM NaHCO3, 14 mM NaSO42-, 1 mM H2S, and 50 uM dissolved organic carbon - consisting of equimolar proportions 10 uM of pyruvate, citrate, formate, acetate, lactate) under a pure nitrogen headspace. Concentrations of sulfide, sulfate and dissolved organic carbon (DOC) were varied independently to investigate concentration dependent effects on the rates of SR. The range of experimental conditions tested was determined from previously published concentration profiles of aqueous species modeled as functions of temperature and position within the Grotto vent structure (Tivey, 2004). Concentrations were varied by orders of magnitude within the modeled ranges to simulate conditions representative of different mixing regimes between seawater and vent fluid (Table 1). The range of DOC (which we approximate as a mix of pyruvate, citrate, formate, acetate, lactate – most of which have been identified to varying degrees within vent fluid and are known carbon sources for heterotrophic SR in culture) concentrations tested were based on the average DOC concentrations measured within diffuse fluids at the Main Endeavor Field (Lang et al., 2006; Lang et al., 2010). Hydrogen sulfide was present as H2S (pKa in seawater of 6.60) across all the conditions tested (Amend & Shock, 2001). Incubations were carried out at pH 4 (to simulate the pH of end-member Grotto vent fluid and the average calculated pH of mixed fluids in highly reduced zones within the flange; Tivey 2004) as well as pH 6 (representative of the calculated pH in fluid mixing zones; Tivey 2004). All the results are presented and discussed in the context of the initial measured media conditions. |
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| Metadata version: | 1 |
| Keydate: | 2023-05-05 03:49:52+00 |
| Editdate: | 2023-05-05 03:50:35+00 |