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  • 136; Campeche Knoll; Carbon dioxide; Center for Marine Environmental Sciences; Ethane; Isobutane; MARUM; Methane; n-Butane; OTEGA II; Propane; Sample type; see reference(s); SO174/2; SO174/2_136; Sonne; Television-Grab; TVG; δ13C, carbon dioxide, gas hydrate; δ13C, ethane; δ13C, isobutane; δ13C, methane; δ13C, propane  (1)
  • 204-1244C; 204-1245B; 204-1247B; 204-1248C; 204-1249C; 204-1249F; 204-1250C; 204-1250D; DRILL; Drilling/drill rig; Joides Resolution; Leg204; North Pacific Ocean; Ocean Drilling Program; ODP  (1)
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  • 1
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    Unknown
    (Table 1) Hydrocarbon gas composition of sediment and gas hydrate collected in video-guided grabs from Chapopote
    PANGAEA
    In:  Supplement to: MacDonald, Ian R; Bohrmann, Gerhard; Escobar, E; Abegg, Friedrich; Blanchon, Paul; Blinova, Valentina N; Brueckmann, Warner; Drews, Manuela; Eisenhauer, Anton; Han, X; Heeschen, Katja U; Meier, Felix; Mortera-Gutierrez, Carlos; Naehr, T; Orcutt, B; Bernard, B; Brroks, J; de Farágo, M (2004): Asphalt volcanism and chemosynthetic life, Campache Knolls, Gulf of Mexico. Science, 304(5673), 999-1002, https://doi.org/10.1126/science.1097154
    Details
    Publication Date: 2023-05-12
    Description: In the Campeche Knolls, in the southern Gulf of Mexico, lava-like flows of solidified asphalt cover more than 1 square kilometer of the rim of a dissected salt dome at a depth of 3000 meters below sea level. Chemosynthetic tubeworms and bivalves colonize the sea floor near the asphalt, which chilled and contracted after discharge. The site also includes oil seeps, gas hydrate deposits, locally anoxic sediments, and slabs of authigenic carbonate. Asphalt volcanism creates a habitat for chemosynthetic life that may be widespread at great depth in the Gulf of Mexico.
    Keywords: 136; Campeche Knoll; Carbon dioxide; Center for Marine Environmental Sciences; Ethane; Isobutane; MARUM; Methane; n-Butane; OTEGA II; Propane; Sample type; see reference(s); SO174/2; SO174/2_136; Sonne; Television-Grab; TVG; δ13C, carbon dioxide, gas hydrate; δ13C, ethane; δ13C, isobutane; δ13C, methane; δ13C, propane
    Type: Dataset
    Format: text/tab-separated-values, 31 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Hydrate, ice and quartz content of eight holes of Leg 204 (2007)
    PANGAEA
    In:  Supplement to: Bohrmann, Gerhard; Kuhs, Werner F; Klapp, Stephan A; Techmer, Kirsten S; Klein, Helmut; Murshed, Mangir M; Abegg, Friedrich (2007): Appearance and preservation of natural gas hydrate from Hydrate Ridge sampled during ODP Leg 204 drilling. Marine Geology, 244(1-4), 1-14, https://doi.org/10.1016/j.margeo.2007.05.003
    Details
    Publication Date: 2024-05-18
    Description: The state of preservation of natural gas hydrate samples, recovered from 6 sites drilled during ODP Leg 204 at southern summit of Hydrate Ridge, Oregon Margin, has been investigated by X-ray diffraction (XRD) and cryo-scanning-electron-microscopy (cryo-SEM) techniques. A detailed characterization of the state of decomposition of gas hydrates is necessary since no pressurized autoclave tools were used for sampling and partial dissociation must have occurred during recovery prior to the quench and storage in liquid nitrogen. Samples from 16 distinct horizons have been investigated by synchrotron X-ray diffraction measurements at HASYLAB/ Hamburg. A full profile fitting analysis (“Rietveld method”) of synchrotron XRD data provides quantitative phase determinations of the major sample constituents such as gas hydrate structure I (sI), hexagonal ice (Ih) and quartz. The ice content (Ih) in each sample is related to frozen water composed of both original existing pore water and the water from decomposed hydrates. Hydrate contents as measured by diffraction vary between 0 and 68 wt.% in the samples we measured. Samples with low hydrate content usually show micro-structural features in cryo-SEM ascribed to extensive decomposition. Comparing the appearance of hydrates at different scales, the grade of preservation seems to be primarily correlated with the contiguous volume of the original existing hydrate; the dissociation front appears to be indicated by micrometer-sized pores in a dense ice matrix.
    Keywords: 204-1244C; 204-1245B; 204-1247B; 204-1248C; 204-1249C; 204-1249F; 204-1250C; 204-1250D; DRILL; Drilling/drill rig; Joides Resolution; Leg204; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 8 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
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