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  • PANGAEA  (4)
  • 2010-2014  (4)
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Keywords
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Years
Year
  • 1
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    (Table 2) Gas hydrate structures at individual sites in the Gulf of Mexico (2010)
    PANGAEA
    Details
    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
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    (Table 3) C1-C5 hydrocarbons measured from purposefully decomposed gas hydrate samples from the Gulf of Mexico (2010)
    PANGAEA
    Details
    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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    DATA PANGAEA
  • 3
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    Gas hydrate structures and C1-C5 hydrocarbons at individual sites in the Gulf of Mexico (2010)
    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
    Details
    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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    DATA PANGAEA
  • 4
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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
    Location Call Number Expected Availability
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    DATA PANGAEA
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