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  • 140; 157-1; 169; Area/locality; Bush Hill; Campeche Knoll; Center for Marine Environmental Sciences; Chapopote; Comment; Elevation of event; Event label; GC; GeoB10618; Gravity corer; Hydrate; Latitude of event; Longitude of event; M67/2b; MARUM; Meteor (1986); OTEGA II; Sample code/label; SO174/1; SO174/1_47-1; SO174/1_96; SO174/2; SO174/2_140; SO174/2_157-1; SO174/2_169; Sonne; Television-Grab; TVG; X-ray diffraction (XRD)  (1)
  • 204-1244C; 204-1244E; 204-1245B; 204-1247B; 204-1248C; 204-1249B; 204-1249C; 204-1249F; 204-1250D; 204-1252A; Angle; Clast shape; Computer tomography (CT) MARCONI Medical MX 8000; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Joides Resolution; Leg204; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label  (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)
Document type
Keywords
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Years
  • 1
    facet.materialart.
    Unknown
    (Table 1) Sample identifier, fabric and dipping angle from ODP Leg 204 samples on Hydrate Ridge, offshore Oregon (2007)
    PANGAEA
    In:  Supplement to: Abegg, Friedrich; Bohrmann, Gerhard; Freitag, Johannes; Kuhs, Werner F (2007): Fabric of gas hydrate in sediments from Hydrate Ridge - results from ODP Leg 204 samples. Geo-Marine Letters, 27, 269-277, https://doi.org/10.1007/s00367-007-0080-4
    Details
    Publication Date: 2024-01-09
    Description: Drilling on Hydrate Ridge, offshore Oregon, during ODP Leg 204 enabled us to investigate fabrics of gas hydrate samples in a wide depth range of the gas hydrate stability zone (GHSZ). X-ray computerized tomographic imaging on whole-round samples, frozen in liquid nitrogen, revealed that layered gas hydrate structures are related to variable processes occurring at different sediment depths. Shallow gas hydrates often form layers parallel or sub-parallel to bedding and also crosscut sedimentary strata and other gas hydrate layers, destroying the original depositional fabric. The dynamic processes interacting with this complicated plumbing system in this shallow environment are responsible for such highly variable gas hydrate fabrics. Gas hydrate layers deeper in the sediments are most often dipping with various angles, and are interpreted as gas hydrate precipitates filling tectonic fractures. These originally open fractures are potential candidates for free gas transportation, and might explain why free gas can rapidly emanate from below the bottom-simulating reflector through the GHSZ to the seafloor.
    Keywords: 204-1244C; 204-1244E; 204-1245B; 204-1247B; 204-1248C; 204-1249B; 204-1249C; 204-1249F; 204-1250D; 204-1252A; Angle; Clast shape; Computer tomography (CT) MARCONI Medical MX 8000; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Joides Resolution; Leg204; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 78 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    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
  • 3
    facet.materialart.
    Unknown
    (Table 2) Gas hydrate structures at individual sites in the Gulf of Mexico (2010)
    PANGAEA
    Details
    Publication Date: 2024-05-18
    Keywords: 140; 157-1; 169; Area/locality; Bush Hill; Campeche Knoll; Center for Marine Environmental Sciences; Chapopote; Comment; Elevation of event; Event label; GC; GeoB10618; Gravity corer; Hydrate; Latitude of event; Longitude of event; M67/2b; MARUM; Meteor (1986); OTEGA II; Sample code/label; SO174/1; SO174/1_47-1; SO174/1_96; SO174/2; SO174/2_140; SO174/2_157-1; SO174/2_169; Sonne; Television-Grab; TVG; X-ray diffraction (XRD)
    Type: Dataset
    Format: text/tab-separated-values, 93 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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