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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 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.771917, Supplement to: Klapp, SA et al. (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

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Abstract:
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.
Project(s):
Center for Marine Environmental Sciences (MARUM)
Ocean Drilling Program (ODP)
Coverage:
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
Event(s):
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
Comment:
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: http://doi.pangaea.de/10.1594/PANGAEA.771920
*Tréhu et al. (2006).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEvent
2 Sample code/labelSample labelKlapp, Stephan A
3 Grain size, meanGrain size meanµmKlapp, Stephan Asee reference(s)
4 Standard deviationStd dev±Klapp, Stephan A
5 NumberNoKlapp, Stephan A
6 Temperature, technicalT tech°CKlapp, Stephan A
7 Elevation of eventElevationm
8 DEPTH, sediment/rockDepth sedmGeocode
9 Depth, top/minDepth topmKlapp, Stephan A
10 Depth, bottom/maxDepth botmKlapp, Stephan A
11 Depth commentDepth commKlapp, Stephan A
12 Latitude of eventLatitude
13 Longitude of eventLongitude
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
116 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Event		2 
Sample label		3 
Grain size mean [µm]		4 
Std dev [±]		5 
No		6 
T tech [°C]		7 
Elevation [m]		8 
Depth sed [m]		9 
Depth top [m]		10 
Depth bot [m]		11 
Depth comm		12 
Latitude		13 
Longitude
GeoB9931-1 Colkheti Seep, BS380GR2231012869.1-11421.000<1.0041.97300041.102330
GeoB9931-1Colkheti Seep, BS380GR, manually2141302999.1-11421.000<1.0041.97300041.102330
GeoB9913-6 Pechori Mound, BS360G213892179.1-9881.3250.701.9541.98333341.123500
GeoB9913-6Pechori Mound, BS360G, manually21091639.1-9881.3250.701.9541.98333341.123500
GeoB9935-2 Samsun Seep, BS383G236106699.1-14314.7004.654.7541.47433337.597167
GeoB11927 Batumi Seep, GeoB11927-74001466139.0-8562.4001.503.3041.95683341.288733
GeoB11956 Batumi Seep, GeoB11956410951199.0-8430.8500.800.9041.95750041.290600
NGHP/01_10D Site 10D, Core 20X, Section 6, 52-59 cm2179918911.5-1038132.41015.86430081.834700
SO174/2_157-2 Bush Hill (TVG-10GH4)204893778.7-5471.000<1.0027.782750-91.507810
SO174/2_157-2Bush Hill (TVG-10GH1)#301#1142618.7-5471.000<1.0027.782750-91.507810
GeoB10618 Chapopote (GeoB10618, CT2)227996724.4-29031.000<1.0021.899160-93.436830
GeoB10618Chapopote (GeoB10618, CT2), manually207975094.4-29031.000<1.0021.899160-93.436830
GeoB10618Chapopote (GeoB10618, CT6)1871097434.4-29031.000<1.0021.899160-93.436830
204-1249C 1249C-1H-CC,0-10 cm#373#134317*4.3-7781.50044.570610-125.147350
204-1250C 1250C-2H-CC,0-1 cm#451#132124*4.4-7965.06044.568780-125.150300
204-1247B 1247B-12H-2, 41-51 cm#592#37440*8.5-83493.01044.577650-125.151280
204-1248C 1248C-11H-5 (notilt)#517#176231*9.9-830100.89044.574230-125.152500
204-1248C1248C-11H-5 (90° tilted)#569#34249*9.9-830100.89044.574230-125.152500
204-1248C1248C-8H-6, 68-87 cm#361#7999*8.8-83074.46044.574230-125.152500
Synthetic CH4-Hydrate#43#241793