Paull, Charles K. et al. (2000): Isotopic composition of CH (sub 4) , CO (sub 2) species, and sedimentary organic matter within samples from the Blake Ridge; gas source implications
Leg/Site/Hole:
Related Expeditions:
ODP 164
Identifier:
ID:
2001-025802
Type:
georefid
ID:
10.2973/odp.proc.sr.164.207.2000
Type:
doi
Creator:
Name:
Paull, Charles K.
Affiliation:
University of North Carolina at Chapel Hill, Geology Department, Chapel Hill, NC, United States
Role:
author
Name:
Lorenson, Thomas D.
Affiliation:
University of Tokyo, Japan
Role:
author
Name:
Borowski, Walter S.
Affiliation:
Ocean Drilling Program, United States
Role:
author
Name:
Ussler, William, III
Affiliation:
U. S. Geological Survey, United States
Role:
author
Name:
Olsen, K. B.
Affiliation:
University of Texas at Arlington, United States
Role:
author
Name:
Rodriguez, Nancy M.
Affiliation:
University of Michigan, United States
Role:
author
Identification:
Title:
Isotopic composition of CH (sub 4) , CO (sub 2) species, and sedimentary organic matter within samples from the Blake Ridge; gas source implications
Year:
2000
Source:
In: Paull, Charles K., Matsumoto, Ryo, Wallace, Paul J., Black, Nancy R., Borowski, Walter S., Collett, Timothy S., Damuth, John E., Dickens, Gerald R., Egeberg, Per Kristian, Goodman, Kim, Hesse, Reinhard F., Hiroki, Yoshihisa, Holbrook, W. Steven, Hoskins, Hartley, Ladd, John, Lodolo, Emanuele, Lorenson, Thomas D., Musgrave, Robert J., Naehr, Thomas H., Okada, Hisatake, Pierre, Catherine, Ruppel, Carolyn D., Satoh, Mikio, Thiery, Regis, Watanabe, Yoshio, Wehner, Hermann, Winters, William J., Wood, Warren T., Miller, Christine M. (editor), Reigel, Ruth (editor), Proceedings of the Ocean Drilling Program; volume 164; scientific results; gas hydrate sampling on the Blake Ridge and Carolina Rise; covering Leg 164 of the cruises of the drilling vessel JOIDES Resolution, Halifax, Nova Scotia, to Miami, Florida, sites 991-997, 31 October-19 December 1995
Publisher:
Texas A & M University, Ocean Drilling Program, College Station, TX, United States
Volume:
164
Issue:
Pages:
67-78
Abstract:
The isotopic characteristics of CH (sub 4) (delta (super 13) C values range from -101.3 per mil to -61.1 per mil PDB, and delta D values range from -256 per mil to -136 per mil SMOW) collected during Ocean Drilling Program (ODP) Leg 164 indicate that the CH (sub 4) was produced by microbial CO (sub 2) reduction and that there is not a significant contribution of thermogenic CH (sub 4) to the sampled sediment gas from the Blake Ridge. The isotopic values of CO (sub 2) (delta (super 13) C range -20.6 per mil to +1.24 per mil PDB) and dissolved inorganic carbon (DIC; delta (super 13) C 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 CH (sub 4) and CO (sub 2) cannot be explained by closed-system fractionation where the CO (sub 2) is solely derived from the locally available sedimentary organic matter (delta (super 13) C -2.0 per mil + or - 1.4 per mil PDB) and the CH (sub 4) is derived from CO (sub 2) reduction. The observed isotopic profiles reflect the combined effects of upwards gas migration and decreased microbial activity with depth.
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:31.5035 West:-75.3245 East:
-75.2807 South:31.4708
Keywords: Isotope geochemistry; Applied geophysics; aliphatic hydrocarbons; alkanes; Atlantic Ocean; bacteria; biogenic processes; Blake-Bahama Outer Ridge; bottom-simulating reflectors; C-13/C-12; carbon; carbon dioxide; D/H; geophysical methods; hydrocarbons; hydrogen; isotope ratios; isotopes; Leg 164; marine sediments; methane; North Atlantic; Ocean Drilling Program; ODP Site 994; ODP Site 995; ODP Site 997; organic compounds; organic materials; sediments; seismic methods; stable isotopes; Standard Mean Ocean Water;
.