Citation:

SP319.13

Name: (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
Published: 2009
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

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.

Project(s):

Center for Marine Environmental Sciences (MARUM)

Coverage:

Median Latitude: 41.214746 * Median Longitude: -118.421826 * South-bound Latitude: 27.782460 * West-bound Longitude: -125.152500 * North-bound Latitude: 44.577650 * East-bound Longitude: -91.507700

Date/Time Start: 2002-07-25T13:30:00 * Date/Time End: 2003-11-06T16:19:00

Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 100.89 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: * 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: * 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: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 14 cores; 88.5 m cored; 1.5 m drilled; 66.6 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	Latitude of event	Latitude
3	Longitude of event	Longitude
4	Elevation of event	Elevation	m
5	Sample code/label	Sample label		Klapp, Stephan A
6	DEPTH, sediment/rock	Depth sed	m			Geocode
7	Comment	Comment		Klapp, Stephan A
8	Crystal size	Size XX	mm	Klapp, Stephan A	Location scan method
9	Standard deviation	Std dev	±	Klapp, Stephan A	Location scan method

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

25 data points

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