Dickens, Gerald Roy; Kennedy, B Mack (2000): (Table 3) Noble gas composition of dissociated gas hydrate specimens from ODP Leg 164 sites [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.804007, Supplement to: Dickens, GR; Kennedy, BM (2000): Noble gases in methane hydrate from the Blake Ridge. In: Paull, CK; Matsumoto, R; Wallace, PJ; Dillon, WP (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 164, 1-6, https://doi.org/10.2973/odp.proc.sr.164.211.2000
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Abstract:
Fractionation of the noble gases should occur during formation of a Structure I gas hydrate from water and CH4 such that CH4 hydrate is greatly enriched in Xenon. Noble gas concentrations and fractionation factors (F[4He], F[22Ne], F[86Kr], and F[132Xe] as well as R/Ra) were determined for eight gas hydrate specimens collected on Leg 164 to evaluate this theoretical possibility and to assess whether sufficient quantities of Xe are hosted in oceanic CH4 hydrate to account for Xe "missing" from the atmosphere. The simplest explanation for our results is that samples contain mixtures of air and two end-member gases. One of the end-member gases is depleted in Ne, but significantly enriched in Kr and Xe, as anticipated if the source of this gas involves fractionation during Structure I gas hydrate formation. However, although oceanic CH4 hydrate may be greatly enriched in Xe, simple mass balance calculations indicate that oceanic CH4 hydrate probably represents only a minor reservoir of terrestrial Xe. Noble gas analyses may play an important role in understanding the dynamics of gas hydrate reservoirs, but significantly more work is needed than presented here.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 32.222080 * Median Longitude: -75.917360 * South-bound Latitude: 31.785700 * West-bound Longitude: -76.190900 * North-bound Latitude: 32.493900 * East-bound Longitude: -75.468600
Date/Time Start: 1995-04-12T17:15:00 * Date/Time End: 1995-12-10T00:10:00
Minimum ORDINAL NUMBER: 1 * Maximum ORDINAL NUMBER: 8
Event(s):
164-994C * Latitude: 31.785700 * Longitude: -75.545900 * Date/Time Start: 1995-11-08T12:45:00 * Date/Time End: 1995-11-15T01:10:00 * Elevation: -2799.1 m * Penetration: 703.5 m * Recovery: 501.47 m * Location: South Atlantic Ocean * Campaign: Leg164 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 84 cores; 703.5 m cored; 0 m drilled; 71.3 % recovery
164-996B * Latitude: 32.493900 * Longitude: -76.190900 * Date/Time Start: 1995-04-12T17:15:00 * Date/Time End: 1995-12-04T18:00:00 * Elevation: -2172.7 m * Penetration: 3.4 m * Recovery: 3.4 m * Location: South Atlantic Ocean * Campaign: Leg164 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 1 core; 3.4 m cored; 0 m drilled; 100 % recovery
164-996C * Latitude: 32.493900 * Longitude: -76.190900 * Date/Time Start: 1995-12-04T18:55:00 * Date/Time End: 1995-12-05T03:00:00 * Elevation: -2170.7 m * Penetration: 2.6 m * Recovery: 2.61 m * Location: South Atlantic Ocean * Campaign: Leg164 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 2 cores; 2.6 m cored; 0 m drilled; 100.4 % recovery
Comment:
Noble gas data is presented in terms of F(i) values. An F(i) value is the fractionation factor relative to atmospheric composition, and is defined as: F(i) = [(i/36Ar)sample]/[(i/36Ar)air] where (i) is the concentration of an isotope of a noble gas.
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 | Dickens, Gerald Roy | DSDP/ODP/IODP sample designation | ||
| 6 | Sample ID | Sample ID | Dickens, Gerald Roy | hydrate specimen; A and B designate successive gas samples | ||
| 7 | ORDINAL NUMBER | Ord No | Geocode | |||
| 8 | Argon-36 | 36Ar | arbitrary units | Dickens, Gerald Roy | in ppmv | |
| 9 | Fractionation factor | Frac Factor | Dickens, Gerald Roy | 4He | ||
| 10 | Fractionation factor, error | Frac Factor e | ± | Dickens, Gerald Roy | 4He | |
| 11 | Fractionation factor | Frac Factor | Dickens, Gerald Roy | 22Ne | ||
| 12 | Fractionation factor, error | Frac Factor e | ± | Dickens, Gerald Roy | 22Ne | |
| 13 | Fractionation factor | Frac Factor | Dickens, Gerald Roy | 84Kr | ||
| 14 | Fractionation factor, error | Frac Factor e | ± | Dickens, Gerald Roy | 84Kr | |
| 15 | Fractionation factor | Frac Factor | Dickens, Gerald Roy | 132Xe | ||
| 16 | Fractionation factor, error | Frac Factor e | ± | Dickens, Gerald Roy | 132Xe | |
| 17 | Ratio | Ratio | Dickens, Gerald Roy | R/Ra = (3He/4He)sample/(3He/4He)air | ||
| 18 | Error, absolute | Error a | ± | Dickens, Gerald Roy | R/Ra |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
104 data points