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OAS accession Detail for 0277890
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| accessions_id: | 0277890 | archive |
|---|---|
| Title: | Porewater geochemistry data for sediment samples included in global seep survey from R/V Atlantis cruise AT15-40 and Alvin dives in the Guaymas Basin in 2008 (Guaymas Basin interactions project) (NCEI Accession 0277890) |
| Abstract: | This dataset contains chemical data collected on Alvin and R/V Atlantis during cruise AT15-40 and deployment AT15-40_Alvin_Dives in the Gulf of California from 2008-12-06 to 2008-12-13. These data include methane and sulfate. The instruments used to collect these data include Gas Chromatograph, Ion Chromatograph, and Isotope-ratio Mass Spectrometer. These data were collected by Andreas P. Teske and Barbara J. MacGregor of University of North Carolina at Chapel Hill as part of the "Collaborative Research: Microbial Carbon cycling and its interactions with Sulfur and Nitrogen transformations in Guaymas Basin hydrothermal sediments (Guaymas Basin Interactions)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2020-08-24. The following is the text of the dataset description provided by BCO-DMO: Porewater geochemistry data for sediment samples that were included in global seep survey (Ruff et al. 2015). Dataset Description: Porewater geochemistry data for sediment samples that were included in global seep survey. |
| Date received: | 20200824 |
| Start date: | 20081206 |
| End date: | 20081213 |
| Seanames: | Gulf of California |
| West boundary: | -111.41 |
| East boundary: | -111.409 |
| North boundary: | 27.009 |
| South boundary: | 27.006 |
| Observation types: | chemical |
| Instrument types: | chromatograph, mass spectrometer |
| Datatypes: | Methane (CH4), Sulfate (SO4 2-) |
| Submitter: | |
| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
| Collecting institutions: | University of North Carolina - Chapel Hill |
| Contributing projects: | |
| Platforms: | Alvin (31A5), Atlantis (33AT) |
| Number of observations: | |
| Supplementary information: | Acquisition Description: Geochemical Analyses: Sulfate concentration measurements were completed shipboard; after centrifuging sediment-filled 15 ml tubes, the overlying porewater was filtered through 0.45 um filters, acidified with 50 ul of 50% HCl and bubbled with nitrogen for 4 minutes to remove sulfide. Sulfate concentrations were then measured shipboard using a 2010i Dionex Ion Chromatograph (Sunnyvale, CA, USA) through Ag+ exchange columns (Dionex) so as to remove Cl- (Martens et al., 1999). For sulfide, 1 ml porewater samples were combined with 0.1M zinc acetate and concentrations were analyzed spectrophotometrically on the ship (Cline 1969). For methane, sediment subsamples were added to serum bottles containing a 0.1 M sodium hydroxide solution. Headspace methane concentrations were determined onboard using standard gas chromatography using a flame ionization detector. Stable isotopic compositions of methane was measured via gas chromatography/combustion/isotope ratio mass spectrometry (GC/C/IRMS) on a Finnigan MAT 252 Isotope Ratio Mass Spectrometer. To measure DIC, 2 ml of unamended porewater from each sediment horizon were injected into evacuated serum vials (30 ml) and stored upside down at -20 degrees C. At UNC, the samples were thawed, and DIC was volatilized by adding 1 ml 30% phosphoric acid to each serum vial and shaking vigorously before GC analysis (Kelley et al., 1990). Stable isotopic values and concentrations of DIC were analyzed via coupled GC (Hewlett Packard 5890) and Isotope Ratio Mass Spectrometer (Finnigan MAT 252). |
| Availability date: | |
| Metadata version: | 1 |
| Keydate: | 2023-05-05 04:09:05+00 |
| Editdate: | 2023-05-05 04:09:55+00 |