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Abegg, Friedrich; Bohrmann, Gerhard; Freitag, Johannes; Kuhs, Werner F (2007): (Table 1) Sample identifier, fabric and dipping angle from ODP Leg 204 samples on Hydrate Ridge, offshore Oregon. PANGAEA,, Supplement to: Abegg, F et al. (2007): Fabric of gas hydrate in sediments from Hydrate Ridge - results from ODP Leg 204 samples. Geo-Marine Letters, 27, 269-277,

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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.
Related 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,
Median Latitude: 44.577620 * Median Longitude: -125.137735 * South-bound Latitude: 44.568430 * West-bound Longitude: -125.152500 * North-bound Latitude: 44.586300 * East-bound Longitude: -125.092810
Date/Time Start: 2002-07-13T12:45:00 * Date/Time End: 2002-09-01T00:00:00
Minimum DEPTH, sediment/rock: 0.25 m * Maximum DEPTH, sediment/rock: 110.51 m
204-1244C * Latitude: 44.586300 * Longitude: -125.119830 * Date/Time Start: 2002-07-13T12:45:00 * Date/Time End: 2002-07-16T05:30:00 * Elevation: -895.1 m * Penetration: 333.5 m * Recovery: 315.5 m * Location: North Pacific Ocean * Campaign: Leg204 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 39 cores; 332 m cored; 1.5 m drilled; 95 % recovery
204-1244E * Latitude: 44.586180 * Longitude: -125.119530 * Date/Time Start: 2002-08-18T23:00:00 * Date/Time End: 2002-08-22T01:45:00 * Elevation: -893.3 m * Penetration: 250 m * Recovery: 137.73 m * Location: North Pacific Ocean * Campaign: Leg204 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 135.8 m cored; 114.2 m drilled; 101.4 % recovery
204-1245B * Latitude: 44.585980 * Longitude: -125.149100 * Date/Time Start: 2002-08-06T07:15:00 * Date/Time End: 2002-08-09T15:45:00 * Elevation: -869.7 m * Penetration: 473.7 m * Recovery: 418.02 m * Location: North Pacific Ocean * Campaign: Leg204 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 53 cores; 471.7 m cored; 2 m drilled; 88.6 % recovery
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Sample code/labelSample labelAbegg, Friedrich
3DEPTH, sediment/rockDepthmGeocode
4Clast shapeShapeAbegg, FriedrichComputer tomography (CT) MARCONI Medical MX 8000
5AngleAngledegAbegg, FriedrichVein angle, from
6AngleAngledegAbegg, FriedrichVein angle, to
7AngleAngledegAbegg, FriedrichVein angle, from #2
8AngleAngledegAbegg, FriedrichVein angle, to #2
78 data points

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