Matsumoto, Ryo; Borowski, Walter S (2000): (Table 1) Stable oxygen isotope ratios of interstitial waters from ODP Sites 164-994 and 164-997 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.803618, Supplement to: Matsumoto, R; Borowski, WS (2000): Gas hydrate estimates from newly determined oxygen isotopic fractionation (aGH-IW) and d18O anomalies of the interstitial waters: Leg 164, 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, 1-8, https://doi.org/10.2973/odp.proc.sr.164.206.2000
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Abstract:
The d18O values of interstitial waters from Site 994 and Site 997 sediments, Blake Ridge, western Atlantic, tend to decrease with depth from 0.3 per mil to -0.5 per mil Standard Mean Ocean Water in the upper 200 mbsf, then fluctuate with significant positive spikes of Delta = 0.2 per mil - 0.5 per mil in the gas hydrate zone (200 to 450 mbsf), and finally increase from -0.4 per mil to -0.2 per mil toward 700 mbsf. Positive shifts of d18O IW in the gas hydrate zone are probably caused by the dissociation of gas hydrates originally contained in sediment cores. Gas hydrates recovered from the sites are enriched in 18O, d18O ranging between 2.7 per mil and 3.5 per mil. d18O values of gas hydrates and ambient interstitial waters give an oxygen isotopic fractionation factor of 1.0034-1.0040 at 12°-16°C and ~31 MPa (3 km below sea level). Based on this fractionation and observed isotopic anomalies in the gas hydrate zone, gas hydrates occupy 6% to 12% of pore-space volume within Blake Ridge sediments.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 31.814450 * Median Longitude: -75.507183 * South-bound Latitude: 31.785700 * West-bound Longitude: -75.545817 * North-bound Latitude: 31.843200 * East-bound Longitude: -75.468550
Date/Time Start: 1995-11-07T00:00:00 * Date/Time End: 1995-12-17T00:00:00
Minimum DEPTH, sediment/rock: 5.80 m * Maximum DEPTH, sediment/rock: 746.85 m
Event(s):
164-994 * Latitude: 31.785700 * Longitude: -75.545817 * Date/Time Start: 1995-11-07T00:00:00 * Date/Time End: 1995-11-20T00:00:00 * Elevation: -2798.4 m * Penetration: 1161.8 m * Recovery: 615.1 m * Location: South Atlantic Ocean * Campaign: Leg164 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 98 cores; 833 m cored; 0 m drilled; 73.8% recovery
164-997 * Latitude: 31.843200 * Longitude: -75.468550 * Date/Time Start: 1995-12-06T00:00:00 * Date/Time End: 1995-12-17T00:00:00 * Elevation: -2770.1 m * Penetration: 1184.3 m * Recovery: 585.4 m * Location: Nicaraguan Rise, North Atlantic Ocean * Campaign: Leg164 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 102 cores; 798.9 m cored; 0 m drilled; 73.3% recovery
Comment:
Sediment depth is given in mbsf. For data of Table 2 see Matsumoto et al. (2000): doi:10.1594/PANGAEA.803549.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Matsumoto, Ryo | DSDP/ODP/IODP sample designation | ||
| 3 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 4 | δ18O, water | δ18O H2O | ‰ SMOW | Matsumoto, Ryo | Isotope ratio mass spectrometry |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
68 data points