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  • PANGAEA  (17)
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Keywords
Years
  • 1
    Publication Date: 2023-03-03
    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
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  • 2
    Publication Date: 2023-03-03
    Keywords: 140; 157-1; 169; Area/locality; Bush Hill; C1 hydrocarbons; C2 hydrocarbons; C3 hydrocarbons; C5-isomers hydrocarbons; Campeche Knoll; Center for Marine Environmental Sciences; Chapopote; Comment; Elevation of event; Event label; Gas chromatography - Flame Ionization Detection (GC-FID); GC; GeoB10618; Gravity corer; iso-C4 hydrocarbons; Latitude of event; Longitude of event; M67/2b; MARUM; Meteor (1986); n-C4 hydrocarbons; Number; 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
    Type: Dataset
    Format: text/tab-separated-values, 123 data points
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  • 3
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    PANGAEA
    In:  Supplement to: Klapp, Stephan A; Bohrmann, Gerhard; Kuhs, Werner F; Murshed, Mangir M; Pape, Thomas; Klein, Helmut; Techmer, Kirsten S; Heeschen, Katja U; Abegg, Friedrich (2010): Microstructures of structure I and II gas hydrates from the Gulf of Mexico. Marine and Petroleum Geology, 27(1), 116-125, https://doi.org/10.1016/j.marpetgeo.2009.03.004
    Publication Date: 2023-03-03
    Description: Gas hydrate samples from various locations in the Gulf of Mexico (GOM) differ considerably in their microstructure. Distinct microstructure characteristics coincide with discrete crystallographic structures, gas compositions and calculated thermodynamic stabilities. The crystallographic structures were established by X-ray diffraction, using both conventional X-ray sources and high-energy synchrotron radiation. The microstructures were examined by cryo-stage Field-Emission Scanning Electron Microscopy (FE-SEM). Good sample preservation was warranted by the low ice fractions shown from quantitative phase analyses. Gas hydrate structure II samples from the Green Canyon in the northern GOM had methane concentrations of 70-80% and up to 30% of C2-C5 of measured hydrocarbons. Hydrocarbons in the crystallographic structure I hydrate from the Chapopote asphalt volcano in the southern GOM was comprised of more than 98% methane. Fairly different microstructures were identified for those different hydrates: Pores measuring 200-400 nm in diameter were present in structure I gas hydrate samples; no such pores but dense crystal surfaces instead were discovered in structure II gas hydrate. The stability of the hydrate samples is discussed regarding gas composition, crystallographic structure and microstructure. Electron microscopic observations showed evidence of gas hydrate and liquid oil co-occurrence on a micrometer scale. That demonstrates that oil has direct contact to gas hydrates when it diffuses through a hydrate matrix.
    Keywords: 140; 157-1; 169; Bush Hill; Campeche Knoll; Center for Marine Environmental Sciences; Chapopote; GC; GeoB10618; Gravity corer; M67/2b; MARUM; Meteor (1986); OTEGA II; 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
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 4
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    PANGAEA
    In:  Supplement to: Klapp, Stephan A; Klein, Helmut; Kuhs, Werner F (2009): Gas hydrate crystallite size investigations with high-energy synchrotron radiation. In: Long, D; Lovell, MA; Rees, JG; Rochelle, CA (eds.) Sediment-Hosted Gas Hydrates: New Insights on Natural and Synthetic Systems. The London Geological Society, London, Special Publications, London, 319, 161-170, https://doi.org/10.1144/SP319.13
    Publication Date: 2023-06-27
    Description: The grain sizes of gas hydrate crystallites are largely unknown in natural samples. Single grains are hardly detectable with electron or optical microscopy. For the first time, we have used high-energy synchrotron diffraction to determine grain sizes of six natural gas hydrates retrieved from the Bush Hill region in the Gulf of Mexico and from ODP Leg 204 at the Hydrate Ridge offshore Oregon from varying depth between 1 and 101 metres below seafloor. High-energy synchrotron radiation provides high photon fluxes as well as high penetration depth and thus allows for investigation of bulk sediment samples. Gas hydrate grain sizes were measured at the Beam Line BW 5 at the HASYLAB/Hamburg. A 'moving area detector method', originally developed for material science applications, was used to obtain both spatial and orientation information about gas hydrate grains within the sample. The gas hydrate crystal sizes appeared to be (log-)normally distributed in the natural samples. All mean grain sizes lay in the range from 300 to 600 µm with a tendency for bigger grains to occur in greater depth. Laboratory-produced methane hydrate, aged for 3 weeks, showed half a log-normal curve with a mean grain size value of c. 40 µm. The grains appeared to be globular shaped.
    Keywords: 157-1; 204-1247B; 204-1248C; 204-1249C; 204-1250C; Bush Hill; Center for Marine Environmental Sciences; Comment; Crystal size; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Elevation of event; Event label; Joides Resolution; Latitude of event; Leg204; Location scan method; Longitude of event; MARUM; North Pacific Ocean; OTEGA II; Sample code/label; SO174/2; SO174/2_157-1; Sonne; Standard deviation; Television-Grab; TVG
    Type: Dataset
    Format: text/tab-separated-values, 25 data points
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  • 5
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    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
    Publication Date: 2024-01-09
    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
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  • 6
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    PANGAEA
    In:  Supplement to: Abegg, Friedrich; Bohrmann, Gerhard; Kuhs, Werner F (2006): Data report: Shapes and structures of gas hydrates imaged by computed tomographic analyses, ODP Leg 204, Hydrate Ridge. In: Tréhu, AM; Bohrmann, G; Torres, ME; Colwell, FS (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 204, 1-11, https://doi.org/10.2973/odp.proc.sr.204.122.2006
    Publication Date: 2024-01-09
    Description: The sediments of Hydrate Ridge/Cascadia margin contain extensive amounts of gas hydrate. A total of 57 sediment samples including gas hydrate were preserved in liquid nitrogen and have been imaged using computerized tomography to visualize hydrate distribution and shape. The analysis gives evidence that gas hydrate in vein and veinlet structures is the predominant shape in the deeper gas hydrate stability zone with dipping angles from 30° to 90°(vertical).
    Keywords: 204-1244; 204-1245; 204-1246; 204-1247; 204-1248; 204-1249; 204-1250; 204-1252; Angle; Clast shape; COMPCORE; Composite Core; Computer tomography (CT) MARCONI Medical MX 8000; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg204; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 160 data points
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  • 7
    Publication Date: 2024-01-09
    Keywords: 204-1244C; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Hydrate; Hydrate, standard deviation; Ice content; Ice content, standard deviation; Joides Resolution; Leg204; North Pacific Ocean; Number; Ocean Drilling Program; ODP; Quartz; Quartz, standard deviation; Sample code/label; X-ray diffraction, Rietveld analyses
    Type: Dataset
    Format: text/tab-separated-values, 16 data points
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  • 8
    Publication Date: 2024-01-09
    Keywords: 204-1245B; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Hydrate; Hydrate, standard deviation; Ice content; Ice content, standard deviation; Joides Resolution; Leg204; North Pacific Ocean; Number; Ocean Drilling Program; ODP; Quartz; Quartz, standard deviation; Sample code/label; X-ray diffraction, Rietveld analyses
    Type: Dataset
    Format: text/tab-separated-values, 8 data points
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  • 9
    Publication Date: 2024-01-09
    Keywords: 204-1247B; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Hydrate; Hydrate, standard deviation; Ice content; Ice content, standard deviation; Joides Resolution; Leg204; North Pacific Ocean; Number; Ocean Drilling Program; ODP; Quartz; Quartz, standard deviation; Sample code/label; X-ray diffraction, Rietveld analyses
    Type: Dataset
    Format: text/tab-separated-values, 8 data points
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  • 10
    Publication Date: 2024-01-09
    Keywords: 204-1250C; Comment; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Hydrate; Hydrate, standard deviation; Ice content; Ice content, standard deviation; Joides Resolution; Leg204; North Pacific Ocean; Number; Ocean Drilling Program; ODP; Quartz; Quartz, standard deviation; Sample code/label; X-ray diffraction, Rietveld analyses
    Type: Dataset
    Format: text/tab-separated-values, 15 data points
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