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  • Data  (17)
  • PANGAEA  (17)
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  • PANGAEA  (17)
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  • 1
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    (Table 1) Crystal sizes of measured samples from the Bush Hill region in the Gulf of Mexico and from ODP Leg 204 at the Hydrate Ridge offshore Oregon
    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
    Details
    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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    DATA PANGAEA
  • 2
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    (Table T1) Gas hydrate fabric and dipping angles of ODP Leg 204 sediments (2006)
    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
    Details
    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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  • 3
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    (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
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  • 4
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    (Table 1) Crystal sizes of measured samples (2007)
    PANGAEA
    In:  Supplement to: Klapp, Stephan A; Klein, Helmut; Kuhs, Werner F (2007): First determination of gas hydrate crystallite size distributions using high-energy synchrotron radiation. Geophysical Research Letters, 34, L13608, https://doi.org/10.1029/2006GL029134
    Details
    Publication Date: 2024-01-09
    Description: Due to experimental difficulties grain size distributions of gas hydrate crystallites are largely unknown in natural samples. For the first time, we were able to determine grain size distributions of six natural gas hydrates for samples retrieved from the Gulf of Mexico and from Hydrate Ridge offshore Oregon from varying depths. High-energy synchrotron radiation provides high photon fluxes as well as high penetration depth and thus allows for investigation of bulk sediment samples. The gas hydrate crystallites appear to be (log-) normally distributed in the natural samples and to be of roughly globular shape. The mean grain sizes are in the range from 300–600 µm with a tendency for bigger grains to occur in greater depth, possibly indicating a difference in the formation age. Laboratory produced methane hydrate, starting from ice and aged for 3 weeks, shows half a log-normal curve with a mean value of ~40 µm. This one order-of-magnitude smaller grain sizes suggests that care must be taken when transposing grain-size sensitive (petro-)physical data from laboratory-made gas hydrates to natural settings.
    Keywords: 157-2; 204-1247B; 204-1248C; 204-1249C; 204-1250C; Bush Hill; DEPTH, sediment/rock; Depth comment; DRILL; Drilling/drill rig; Elevation of event; Event label; Grain size, mean; Joides Resolution; Latitude of event; Leg204; Location scan method; Longitude of event; North Pacific Ocean; Ocean Drilling Program; ODP; OTEGA II; Sample code/label; SO174/2; SO174/2_157-2; Sonne; Standard deviation; Television-Grab; TVG
    Type: Dataset
    Format: text/tab-separated-values, 26 data points
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  • 5
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    (Table 1) Mean grain sizes and standard deviations of gas hydrate samples (2010)
    PANGAEA
    In:  Supplement to: Klapp, Stephan A; Hemes, H; Klein, Helmut; Bohrmann, Gerhard; MacDonald, Ian R; Kuhs, Werner F (2010): Grain size measurements of natural gas hydrates. Marine Geology, 274(1-4), 85-94, https://doi.org/10.1016/j.margeo.2010.03.007
    Details
    Publication Date: 2024-02-02
    Description: Methane hydrates are present in marine seep systems and occur within the gas hydrate stability zone. Very little is known about their crystallite sizes and size distributions because they are notoriously difficult to measure. Crystal size distributions are usually considered as one of the key petrophysical parameters because they influence mechanical properties and possible compositional changes, which may occur with changing environmental conditions. Variations in grain size are relevant for gas substitution in natural hydrates by replacing CH4 with CO2 for the purpose of carbon dioxide sequestration. Here we show that crystallite sizes of gas hydrates from some locations in the Indian Ocean, Gulf of Mexico and Black Sea are in the range of 200–400 µm; larger values were obtained for deeper-buried samples from ODP Leg 204. The crystallite sizes show generally a log-normal distribution and appear to vary sometimes rapidly with location.
    Keywords: 157-2; 204-1247B; 204-1248C; 204-1249C; 204-1250C; Batumi Seep; BS360G; BS380GR; BS383G; Bush Hill; Center for Marine Environmental Sciences; Chapopote; Colkheti Seep; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Depth comment; DRILL; Drilling/drill rig; Elevation of event; Event label; GC; GC-18; GC-6; GeoB10618; GeoB11927; GeoB11956; GeoB9913-6; GeoB9931-1; GeoB9935-2; Geological sample; GEOS; Grain size, mean; Gravity corer; Indian Ocean; Joides Resolution; Latitude of event; Leg204; Longitude of event; M67/2b; M72/3a; M72/3b; MARUM; Meteor (1986); NGHP/01_10D; North Pacific Ocean; Number; Ocean Drilling Program; ODP; OTEGA II; Pechori Mound; Professor Logachev; Sample code/label; see reference(s); SO174/2; SO174/2_157-2; Sonne; Standard deviation; Television-Grab; Temperature, technical; TTR-15; TVG
    Type: Dataset
    Format: text/tab-separated-values, 116 data points
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  • 6
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    (Table 1) Hydrate, ice and quartz content of ODP Hole 204-1249F (2007)
    PANGAEA
    Details
    Publication Date: 2024-05-18
    Keywords: 204-1249F; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Hydrate; Ice content; Joides Resolution; Leg204; North Pacific Ocean; Number; Ocean Drilling Program; ODP; Quartz; Sample code/label; X-ray diffraction, Rietveld analyses
    Type: Dataset
    Format: text/tab-separated-values, 5 data points
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  • 7
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    (Table 1) Hydrate, ice and quartz content of ODP Hole 204-1250D (2007)
    PANGAEA
    Details
    Publication Date: 2024-05-18
    Keywords: 204-1250D; 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, 40 data points
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  • 8
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    (Table 1) Hydrate, ice and quartz content of ODP Hole 204-1247B (2007)
    PANGAEA
    Details
    Publication Date: 2024-05-18
    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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  • 9
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    (Table 1) Hydrate, ice and quartz content of ODP Hole 204-1249C (2007)
    PANGAEA
    Details
    Publication Date: 2024-05-18
    Keywords: 204-1249C; 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, 21 data points
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  • 10
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    (Table 1) Hydrate, ice and quartz content of ODP Hole 204-1250C (2007)
    PANGAEA
    Details
    Publication Date: 2024-05-18
    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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    DATA PANGAEA
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