(Table 3) Noble gas composition of dissociated gas hydrate specimens from ODP Leg 164 sites

Fractionation of the noble gases should occur during formation of a Structure I gas hydrate from water and CH4 such that CH4 hydrate is greatly enriched in Xenon. Noble gas concentrations and fractionation factors (F[4He], F[22Ne], F[86Kr], and F[132Xe] as well as R/Ra) were determined for eight gas hydrate specimens collected on Leg 164 to evaluate this theoretical possibility and to assess whether sufficient quantities of Xe are hosted in oceanic CH4 hydrate to account for Xe "missing" from the atmosphere. The simplest explanation for our results is that samples contain mixtures of air and two end-member gases. One of the end-member gases is depleted in Ne, but significantly enriched in Kr and Xe, as anticipated if the source of this gas involves fractionation during Structure I gas hydrate formation. However, although oceanic CH4 hydrate may be greatly enriched in Xe, simple mass balance calculations indicate that oceanic CH4 hydrate probably represents only a minor reservoir of terrestrial Xe. Noble gas analyses may play an important role in understanding the dynamics of gas hydrate reservoirs, but significantly more work is needed than presented here.

(Table 1) Deuterium ratios, chloride content and hydrate volume of pore water and hydrate meltwater from ODP Site 164-996

Site 996 is located above the Blake Diapir where numerous indications of vertical fluid migration and the presence of hydrate existed prior to Ocean Drilling Program (ODP) Leg 164. Direct sampling of hydrates and visual observations of hydrate-filled veins that could be traced 30-40 cm along cores suggest a connection between fluid migration and hydrate formation. The composition of pore water squeezed from sediment cores showed large variations due to melting of hydrate during core recovery and influence of saline water from the evaporitic diapir below. Analysis of water released during hydrate decomposition experiments showed that the recovered hydrates contained significant amounts of pore water. Solutions of the transport equations for deuterium (d2H) and chloride (Cl-) were used to determine maximum (d2H) and minimum (Cl-) in situ concentrations of these species. Minimum in situ concentrations of hydrate were estimated by combining these results with Cl- and d2H values measured on hydrate meltwaters and pore waters obtained by squeezing of sediments, by the means of a method based on analysis of distances in the two-dimensional Cl- d2H space. The computed Cl- and d2H distribution indicates that the minimum hydrate amount solutions are representative of the actual hydrate amount. The highest and mean hydrate concentrations estimates from our model are 31% and 10% of the pore space, respectively. These concentrations agree well with visual core observations, supporting the validity of the model assumptions. The minimum in situ Cl- concentrations were used to constrain the rates of upward fluid migration. Simulation of all available data gave a mean flow rate of 0.35 m/k.y. (range: 0.125-0.5 m/k.y.).

Flammable fabrics act. Public law 88, chapter 164; 83d Congress, 1st session, H.R.5069.

Mode of access: Internet.

Royal palaces of Spain; a historical & descriptive account of the seven principal palaces of the Spanish kings, with 164 illus.

The Escorial.- La Granja (San Ildefonso)- El Pardo.- Aranjuez.- Miramar.- El Alcazar (Seville)- Royal palace (Madrid)

The Illinois state plans, fiscal year ... for the construction of facilities for the mentally retarded (Title I-C) and community mental health centers (Title II) Public Law 88-164.

Title varies slightly.

Organizational, direct support and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for air compressor, reciprocating, gasoline engine driven, 15 cfm, 175 psi, NSN 4310-01-164-5544.

Includes index.

Organizational and direct support maintenance repair parts and special tools lists for electronic shop maintenance facility AN/ARM-164 (NSN 4940-00-122-7224).

"June 1979."

Organizational, direct support, and general support maintenance repair parts and special tools list for air conditioner, horizontal compact, 9,000 Btu/hr, 208-volt, 3 phase, 50/60 hertz, model F9000H-3S, NSN 4120-01-164-7420.

"5 August 1985."

Operator and organizational maintenance manual : shop equipment, organizational repair, truck mounted, (Southwest truck body model SEORL), FSN 4940-169-3041, (Southwest Truck body model SEORLT), FSN 4940-164-4719.

Includes index.