Shipley, Thomas H; Didyk, Borys M (1982): (Table 1) Suspected gas hydrate occurrence on DSDP Leg 66 Holes [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.817733, Supplement to: Shipley, TH; Didyk, BM (1982): Occurrence of methane hydrates offshore southern Mexico. In: Watkins, JS; Casey Moore, J; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 66, 547-555, https://doi.org/10.2973/dsdp.proc.66.120.1982
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Abstract:
Evidence for naturally occurring methane hydrates was collected at three drill sites off the southern Mexico continental margin. The hydrates are manifested either by ice inclusions or, more often, as frozen porous volcanic ash and fine sands interlayered with muds. Gas generation from the ice inclusions and interstitial water of the frozen sediment was as high as about 7 ml of gas/ml of water. One large sample immediately placed in a sealed container released about 20 ml of gas/ml of water. All of these values are higher than may be accounted for by gas solubility at in situ conditions.
Measured thermal gradients place the bottom-simulating reflection (BSR) in this area very near the phase boundary for the methane hydrate system. This is consistent with earlier interpretations that the BSR is related to the hydrate/gas phase boundary.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 16.089033 * Median Longitude: -98.991333 * South-bound Latitude: 16.029000 * West-bound Longitude: -99.056500 * North-bound Latitude: 16.159300 * East-bound Longitude: -98.945300
Date/Time Start: 1979-04-08T00:00:00 * Date/Time End: 1979-04-20T00:00:00
Minimum DEPTH, sediment/rock: 88.950 m * Maximum DEPTH, sediment/rock: 364.250 m
Event(s):
66-490 * Latitude: 16.159300 * Longitude: -99.056500 * Date/Time: 1979-04-08T00:00:00 * Elevation: -1761.0 m * Penetration: 588.5 m * Recovery: 343.4 m * Location: North Pacific/TRANSITION ZONE * Campaign: Leg66 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 63 cores; 577 m cored; 9 m drilled; 59.5 % recovery
66-491 * Latitude: 16.029000 * Longitude: -98.972200 * Date/Time: 1979-04-13T00:00:00 * Elevation: -2883.0 m * Penetration: 542 m * Recovery: 389.4 m * Location: North Pacific/SLOPE * Campaign: Leg66 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 58 cores; 532.5 m cored; 4.5 m drilled; 73.1 % recovery
66-492 * Latitude: 16.078800 * Longitude: -98.945300 * Date/Time: 1979-04-20T00:00:00 * Elevation: -1935.0 m * Penetration: 279 m * Recovery: 177.5 m * Location: North Pacific/SLOPE * Campaign: Leg66 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 29 cores; 260.2 m cored; 0 m drilled; 68.2 % recovery
Comment:
Sediment depth is given in mbsf. H2S was not detected in any of the samples.
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 | Shipley, Thomas H | |||
| 6 | Depth, top/min | Depth top | m | Shipley, Thomas H | ||
| 7 | Depth, bottom/max | Depth bot | m | Shipley, Thomas H | ||
| 8 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 9 | Lithology/composition/facies | Lithology | Shipley, Thomas H | |||
| 10 | Pressure | P | GPa | Shipley, Thomas H | Estimated | Minimum estimated from hydrostatic gradient 99.7 atm/km water and 0.1 atm/m sediments. Original unit 1 atm = 1*1.03323 GPa, in situ |
| 11 | Temperature, in rock/sediment | t | °C | Shipley, Thomas H | Estimated | Estimated from measured bottom water temperatures and a gradient 2.2°/100 m (Shipley and Shephard, 1982), in situ |
| 12 | Ratio | Ratio | Shipley, Thomas H | Estimated | Hydrate gas-generating ratio, #1, measured, ml gas/ml sample, porosity correction (46%) is assumed for frozen sediments to correct to ml gas/ml water in interstitial water, in situ | |
| 13 | Ratio | Ratio | Shipley, Thomas H | Estimated | Hydrate gas-generating ratio, #2, measured, ml gas/ml sample, porosity correction (46%) is assumed for frozen sediments to correct to ml gas/ml water in interstitial water, in situ | |
| 14 | Ratio | Ratio | Shipley, Thomas H | Estimated | Hydrate gas-generating ratio, #1, porosity corrected, ml gas/ml sample, porosity correction (46%) is assumed for frozen sediments to correct to ml gas/ml water in interstitial water, in situ | |
| 15 | Ratio | Ratio | Shipley, Thomas H | Estimated | Hydrate gas-generating ratio, #2, porosity corrected, ml gas/ml sample, porosity correction (46%) is assumed for frozen sediments to correct to ml gas/ml water in interstitial water, in situ | |
| 16 | Carbon dioxide | CO2 | % | Shipley, Thomas H | ||
| 17 | C1 hydrocarbons | C1 | % | Shipley, Thomas H | ||
| 18 | C2 hydrocarbons | C2 | % | Shipley, Thomas H | ||
| 19 | C3 hydrocarbons | C3 | mg/kg | Shipley, Thomas H | ||
| 20 | C4 hydrocarbons | C4 | ppmv | Shipley, Thomas H | ||
| 21 | C5 hydrocarbons | C5 | ng/g | Shipley, Thomas H | ||
| 22 | C1/(C2+C3) hydrocarbon ratio | C1/(C2+C3) | Shipley, Thomas H | |||
| 23 | Description | Description | Shipley, Thomas H | Gas composition of actual hydrate, frozen material, or closest core liner gas available indicating core distance to frozen lithology in meters. Composition corrected for air components |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
128 data points