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Klapp, Stephan A; Hemes, H; Klein, Helmut; Bohrmann, Gerhard; MacDonald, Ian R; Kuhs, Werner F (2010): (Table 1) Mean grain sizes and standard deviations of gas hydrate samples. PANGAEA,, Supplement to: Klapp, SA et al. (2010): Grain size measurements of natural gas hydrates. Marine Geology, 274(1-4), 85-94,

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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.
Median Latitude: 38.573876 * Median Longitude: -18.765703 * South-bound Latitude: 15.864300 * West-bound Longitude: -125.152500 * North-bound Latitude: 44.577650 * East-bound Longitude: 81.834700
Date/Time Start: 2002-07-25T13:30:00 * Date/Time End: 2007-04-11T10:14:00
Minimum DEPTH, sediment/rock: 0.850 m * Maximum DEPTH, sediment/rock: 132.410 m
204-1247B * Latitude: 44.577650 * Longitude: -125.151280 * Date/Time Start: 2002-08-22T06:45:00 * Date/Time End: 2002-08-24T19:15:00 * Elevation: -834.3 m * Penetration: 220 m * Recovery: 211.98 m * Location: North Pacific Ocean * Campaign: Leg204 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 217 m cored; 3 m drilled; 97.7 % recovery
204-1248C * Latitude: 44.574230 * Longitude: -125.152500 * Date/Time Start: 2002-08-01T13:45:00 * Date/Time End: 2002-08-02T12:30:00 * Elevation: -829.6 m * Penetration: 149 m * Recovery: 101.44 m * Location: North Pacific Ocean * Campaign: Leg204 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 149 m cored; 0 m drilled; 68.1 % recovery
204-1249C * Latitude: 44.570610 * Longitude: -125.147350 * Date/Time Start: 2002-07-25T13:30:00 * Date/Time End: 2002-07-26T11:45:00 * Elevation: -778.4 m * Penetration: 90 m * Recovery: 58.97 m * Location: North Pacific Ocean * Campaign: Leg204 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 14 cores; 88.5 m cored; 1.5 m drilled; 66.6 % recovery
Site conditions (water depth, burial depth meters below sea floor [mbsf] and temperature) are given for marine samples to provide information about the stability conditions for the hydrates
#Klapp et al. (2007), see also:
*Tréhu et al. (2006).
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Sample code/labelSample labelKlapp, Stephan A
3Grain size, meanGrain size meanµmKlapp, Stephan Asee reference(s)
4Standard deviationStd dev±Klapp, Stephan A
5NumberNoKlapp, Stephan A
6Temperature, technicalT tech°CKlapp, Stephan A
7Elevation of eventElevationm
8DEPTH, sediment/rockDepth sedmGeocode
9Depth, top/minDepth topmKlapp, Stephan A
10Depth, bottom/maxDepth botmKlapp, Stephan A
11Depth commentDepth commKlapp, Stephan A
12Latitude of eventLatitude
13Longitude of eventLongitude
116 data points

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