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Teichert, Barbara M A; Gussone, Nikolaus; Eisenhauer, Anton; Bohrmann, Gerhard (2005): (Table 1) Stable isotope records of clathrite and water. PANGAEA, https://doi.org/10.1594/PANGAEA.770144, Supplement to: Teichert, BMA et al. (2005): Clathrites - Archives of near-seafloor pore fluid evolution (d44/40Ca, d13C, d18O) in gas hydrate environments. Geology, 33(3), 213-216, https://doi.org/10.1130/G21317.1

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Abstract:
Aragonitic clathrites are methane-derived precipitates that are found at sites of massive near-seafloor gas hydrate (clathrate) accumulations at the summit of southern Hydrate Ridge, Cascadia margin. These platy carbonate precipitates form inside or in proximity to gas hydrate, which in our study site currently coexists with a fluid that is highly enriched in dissolved ions as salts are excluded during gas hydrate formation. The clathrites record the preferential incorporation of 18O into the hydrate structure and hence the enrichment of 16O in the surrounding brine. We measured d18O values as high as 2.27 per mil relative to Peedee belemnite that correspond to a fluid composition of -1.18 per mil relative to standard mean ocean water. The same trend can be observed in Ca isotopes. Ongoing clathrite precipitation causes enrichment of the 44Ca in the fluid and hence in the carbonates. Carbon isotopes confirm a methane source for the carbonates. Our triple stable isotope approach that uses the three main components of carbonates (Ca, C, O) provides insight into multiple parameters influencing the isotopic composition of the pore water and hence the isotopic composition of the clathrites. This approach provides a tool to monitor the geochemical processes during clathrate and clathrite formation, thus recording the evolution of the geochemical environment of gas hydrate systems.
Coverage:
Median Latitude: 44.569975 * Median Longitude: -125.147128 * South-bound Latitude: 44.568300 * West-bound Longitude: -125.147883 * North-bound Latitude: 44.571000 * East-bound Longitude: -125.146200
Date/Time Start: 1999-07-15T21:30:00 * Date/Time End: 2000-07-30T05:30:00
Minimum DEPTH, sediment/rock: 0.25 m * Maximum DEPTH, sediment/rock: 0.25 m
Event(s):
SO143_21-2 * Latitude Start: 44.570350 * Longitude Start: -125.147130 * Latitude End: 44.570350 * Longitude End: -125.146960 * Date/Time Start: 1999-07-15T21:30:00 * Date/Time End: 1999-07-15T22:15:00 * Elevation: -788.0 m * Recovery: 0.33 m * Campaign: SO143/1b (TECFLUX I) * Basis: Sonne * Device: Television-Grab (TVG) * Comment: 3 subcores (20-33 cm; 2 prarllel cores; 2 pw.) drop at 21:48:32
SO143_222 * Latitude Start: 44.569500 * Longitude Start: -125.146200 * Latitude End: 44.571000 * Longitude End: -125.147500 * Date/Time Start: 1999-08-31T17:27:00 * Date/Time End: 1999-08-31T18:45:00 * Elevation: -772.0 m * Campaign: SO143/3 (TECFLUX I) * Basis: Sonne * Device: Television-Grab (TVG) * Comment: dropped at 44°34.238N/125°08.843W
SO143_56-1 * Latitude Start: 44.569967 * Longitude Start: -125.146567 * Latitude End: 44.570500 * Longitude End: -125.147333 * Date/Time Start: 1999-07-24T22:01:00 * Date/Time End: 1999-07-24T00:53:00 * Elevation: -787.1 m * Campaign: SO143/1b (TECFLUX I) * Basis: Sonne * Device: Television-Grab (TVG) * Comment: dropped at 23:14:51
Comment:
Note: PDB = Peedee belemnite standard; SMOW = standard mean ocean water.
d = distal; p = proximal.
t d18O calculated for the fluid from clathrite measurements after Hudson and Anderson (1989).
* d44/40Ca fluid calculated for the fluid from clathrite measurements after Gussone et al. (2003).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, sediment/rockDepthmGeocode
6Depth, top/minDepth topmTeichert, Barbara M A
7Depth, bottom/maxDepth botmTeichert, Barbara M A
8Sample code/labelSample labelTeichert, Barbara M A
9Sample code/label 2Sample label 2Teichert, Barbara M A
10delta 13C, clathrited13C clathriteper mil PDBTeichert, Barbara M A
11delta 18O, clathrited18O, clathriteper mil PDBTeichert, Barbara M A
12delta 18O, waterd18O H2Oper mil SMOWTeichert, Barbara M ACalculated, see reference(s)d18O t
13delta 44/40 Cad44/40 Caper mil SRM 915aTeichert, Barbara M AFinnigan TRITON thermal ionization mass spectrometer (TIMS)d44/40Ca carb
14delta 44/40 Cad44/40 Caper mil SRM 915aTeichert, Barbara M ACalculated, see reference(s)d44/40Ca fluid *
Size:
144 data points

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