(Table 1) Composition of pore water from ODP Site 997 holes A and B

Pore water extracted from sediments penetrated on Leg 164 of the Ocean Drilling Program at the Blake Ridge West. Atlantic were analyzed for acetate, total dissolved organic carbon, bromide and iodide, to help explain the occurrence of subsurface maxima in bacteria biomass and activity reported previously from a nearby site. The high concentrations of these organic matter decomposition by-products in the pore waters from sediments with moderate concentrations of sedimentary organic matter can convincingly be modelled as resulting from upward migration of pore water. The amount of acetate and unidentified DOC transported by the pore water contribute significantly to the pool of metabolizable carbon, and may be the most important substances in energetic terms.

Reporting under the Welfare and Pension Plans Disclosure Act, Public Law 85-836 : effective Jan. 1, 1959, 72 Stat. 997.

"Guide in using plan description and annual report forms prepared by the Secretary of Labor."

Aviation unit and intermediate maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for helicopter, utility - tactical transport, UH-1B, UH-1C, UH-1H, UH-1M, EH-1H (Bell), UH-1V, NSN 1520-00-713-9912 (UH-1B), 1520-00-997-8862 (UH-1C), 1520-00-087-7637 (UH-1H), 1520-00-809-2631 (UH-1M), 1520-00-368-8442 (EH-1H), 1520-01-043-4949 (UH-1V).

"27 February 1981"--[Vol. 1].

Operator, organizational, direct, and general support maintenance manual : compressor, reciprocating, air, wheel mounted, 2 wheel, pneumatic tires, GED, 4 cfm, 3000 psi (210.9000 kgs per sq cm) (Walter Kidde model 893811), NSN 4310-00-997-6004.

"June 1975."

Organizational maintenance repair parts and special tools lists : roller, motorized gasoline engine driven, 3 wheel, 10 ton, w/sprinkler, NSN 3895-00-997-6099, Huber model E1012MR.

"February 1984."

Direct support and general support maintenance repair parts and special tools lists, roller, motorized, gasoline engine driven, 3 wheel, 10 ton, w/sprinkler NSN 3895-00-997-6099 Huber model E1012MR.

"December 1983."

Aviation unit and intermediate maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for helicopter, utility - tactical transport, UH-1B, UH-1C, UH-1H, UH-1M, EH-1H (Bell), UH-1V, NSN 1520-00-713-9912 (UH-1B), 1520-00-997-8862 (UH-1C), 1520-00-087-7637 (UH-1H), 1520-00-809-2631 (UH-1M), 1520-00-368-8442 (EH-1H), 1520-01-043-4949 (UH-1V).

"27 February 1981"--[Vols. 1-2].

Aviation unit and intermediate maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for helicopter, utility - tactical transport, UH-1B, UH-1C, UH-1H, UH-1M, EH-1H (Bell), UH-1V, NSN 1520-00-713-9912 (UH-1B), 1520-00-997-8862 (UH-1C), 1520-00-087-7637 (UH-1H), 1520-00-809-2631 (UH-1M), 1520-00-368-8442 (EH-1H), 1520-01-043-4949 (UH-1V) [microform].

"15 March 1988"--[Vol.] 3.

(Table 1) Stable nitrogen isotopes of ammonium in interstitial waters from ODP Site 164-997

Ammonium (NH4+) concentration profiles in piston-core sediments of the Carolina Rise and Blake Ridge generally have linear concentration profiles within the sulfate reduction zone (Borowski, 1998). Deep Sea Drilling Project (DSDP) Site 533, located on the Blake Ridge, also displayed a linear ammonium concentration profile through the sulfate reduction zone and the profile linearity continues into the upper methanogenic zone to a depth of ~200 meters below seafloor (mbsf), where the first methane gas hydrates probably occur (Jenden and Gieskes, 1983, doi:10.2973/dsdp.proc.76.114.1983; Kvenvolden and Barnard, 1983, doi:10.2973/dsdp.proc.76.106.1983). Sediments from the Ocean Drilling Program (ODP) Leg 164 deep holes (Sites 994, 995, and 997) also exhibit linear ammonium profiles above the top of the gas hydrate zone (~200 mbsf) (Paull, Matsumoto, Wallace, et al., 1996, doi:10.2973/odp.proc.ir.164.1996). We hypothesized that a possible cause of linear ammonium profiles was diffusion of ammonium from a concentrated ammonium source at depth. We further reasoned that if this ammonium were produced by microbial fermentation reactions at depth, that a comparison of the nitrogen isotopic composition of sedimentary organic nitrogen and the nitrogen with pore-water ammonium would test this hypothesis. Convergence with depth of d15N values of the nitrogen source (sedimentary organic matter) and the nitrogen product (dissolved NH4+) would strongly suggest that ammonium was produced within a particular depth zone by microbial fermentation reactions. Here, we report d15N values of pore-water ammonium from selected interstitial water (IW) samples from Site 997, sampled during ODP Leg 164.