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Paull, Charles K; Lorenson, Thomas D; Borowski, Walter S; Ussler, William III; Olsen, K; Rodriguez, Nancy M (2000): Isotopic ratios of methane, ethane, carbon dioxide, inorganic carbon and organic matter from ODP Leg 164 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.803647, Supplement to: Paull, CK et al. (2000): Isotopic composition of CH4, CO2 species, and sedimentary organic matter within samples from the Blake Ridge: gas source implications. 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, 1-12, https://doi.org/10.2973/odp.proc.sr.164.207.2000

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Published: 2000 (exact date unknown) • DOI registered: 2013-01-04

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Abstract:
The isotopic characteristics of CH4 (d13C values range from -101.3 per mil to -61.1 per mil PDB, and dD values range from -256 per mil to -136 per mil SMOW) collected during Ocean Drilling Program (ODP) Leg 164 indicate that the CH4 was produced by microbial CO2 reduction and that there is not a significant contribution of thermogenic CH4 to the sampled sediment gas from the Blake Ridge. The isotopic values of CO2 (d13C range -20.6 per mil to +1.24 per mil PDB) and dissolved inorganic carbon (DIC; d13C range -37.7 per mil to +10.8 per mil PDB) have parallel profiles with depth, but with an offset of 12.5 per mil. Distinct downhole variations in the carbon isotopic composition of CH4 and CO2 cannot be explained by closed-system fractionation where the CO2 is solely derived from the locally available sedimentary organic matter (d13C -2.0 per mil ± 1.4 per mil PDB) and the CH4 is derived from CO2 reduction. The observed isotopic profiles reflect the combined effects of upwards gas migration and decreased microbial activity with depth.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 32.055854 * Median Longitude: -75.709557 * South-bound Latitude: 31.785700 * West-bound Longitude: -76.191300 * North-bound Latitude: 32.983600 * East-bound Longitude: -75.468500
Date/Time Start: 1995-04-12T17:15:00 * Date/Time End: 1995-12-17T07:25:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Paull, CK; Lorenson, TD; Borowski, WS et al. (2000): (Table 1) Stable carbon isotope ratios of methane and carbon dioxide in gas samples collected from ODP Leg 164 cores. https://doi.org/10.1594/PANGAEA.803641
  2. Paull, CK; Lorenson, TD; Borowski, WS et al. (2000): (Table 2) Stable carbon isotope ratios of methane and carbon dioxide in gas samples collected from ODP Leg 164 pressure cores. https://doi.org/10.1594/PANGAEA.803642
  3. Paull, CK; Lorenson, TD; Borowski, WS et al. (2000): (Table 3) Stable carbon isotope ratios of ethane in gas samples collected from ODP Site 164-997. https://doi.org/10.1594/PANGAEA.803643
  4. Paull, CK; Lorenson, TD; Borowski, WS et al. (2000): (Table 4) Stable deuterium and carbon isotope ratios of selected methane samples from ODP Leg 164 sites. https://doi.org/10.1594/PANGAEA.803644
  5. Paull, CK; Lorenson, TD; Borowski, WS et al. (2000): (Table 6) Stable carbon and nitrogen isotope ratios of sedimentary organic matter from ODP Leg 164 sites. https://doi.org/10.1594/PANGAEA.803646
  6. Paull, CK; Lorenson, TD; Borowski, WS et al. (2000): (Table 5) Stable carbon isotope ratios of dissolved inorganic carbon from pore waters of ODP Leg 164 sites. https://doi.org/10.1594/PANGAEA.803645