Light hydrocarbons in gas pockets and sediments of ODP Site 131-808

A suite of gas samples obtained from gas pockets and sediments of the Nankai accretionary prism (Site 808) has been analyzed for their gas composition and carbon and hydrogen isotope ratios. Gases collected from gas pockets between 10 and 555 mbsf consist of CH4 and CO2. Stable carbon isotope ratios of these two components point to a bacterial formation of methane via CO2-reduction that is also supported by D/H ratios of methane. Methane desorbed from sediments by a vacuum/acid treatment is of bacterial and thermal origin. Mixing between these gas types is indicated by molecular composition and carbon isotope ratios. Diagenetic processes at low temperatures can explain ethane to pentane concentrations from 0 to 850 mbsf. Between 850 mbsf and the basaltic basement hydrocarbon occurrences are related to catagenetic processes at elevated temperatures. Thermal alteration of organic matter is reflected through different gas parameters. Propane carbon isotope values of a sample from the zone of the frontal thrust indicate that the gas likely migrated from sediments of a higher maturity into the immature sediments at 366 mbsf.

Clay mineralogy of ODP Site 131-808 sediments

Drill core recovered at Ocean Drilling Program Site 808 (Leg 131) proves that the wedge of trench sediment within the central region of the Nankai Trough comprises approximately 600 m of hemipelagic mud, sandy turbidites, and silty turbidites. The stratigraphic succession thickens and coarsens upward, with hemipelagic muds and volcanic-ash layers of the Shikoku Basin overlain by silty and sandy trench-wedge deposits. Past investigations of clay mineralogy and sand petrography within this region have led to the hypothesis that most of the detritus in the Nankai Trough was derived from the Izu-Honshu collision zone and transported southwestward via axial turbidity currents. Shipboard analyses of paleocurrent indicators, on the other hand, show that most of the ripple cross-laminae within silty turbidites of the outer marginal trench-wedge facies are inclined to the north and northwest; thus, many of the turbidity currents reflected off the seaward slope of the trench rather than moving straight down the trench axis. Shore-based analyses of detrital clay minerals demonstrate that the hemipelagic muds and matrix materials within sandy and silty turbidites are all enriched in illite; chlorite is the second-most abundant clay mineral, followed by smectite. In general, the relative mineral percentages change relatively little as a function of depth, and the hemipelagic clay-mineral population is virtually identical to the turbidite-matrix population. Comparisons between different size fractions (<2 µm and 2-6 µm) show modest amounts of mineral partitioning, with chlorite content increasing in the coarser fraction and smectite increasing in the finer fraction. Values of illite crystallinity index are consistent with conditions of advanced anchimetamorphism and epimetamorphism within the source region. Of the three mica polytypes detected, the 2M1 variety dominates over the 1M and 1Md polytypes; these data are consistent with values of illite crystallinity. Measurements of mica bo lattice spacing show that the detrital illite particles were eroded from a zone of intermediate-pressure metamorphism. Collectively, these data provide an excellent match with the lithologic and metamorphic character of the Izu-Honshu collision zone. Data from Leg 131, therefore, confirm the earlier interpretations of detrital provenance. The regional pattern of sediment dispersal is dominated by a combination of southwest-directed axial turbidity currents, radial expansion of the axial flows, oblique movement of suspended clouds onto and beyond the seaward slope of the Nankai Trough, and flow reflection back toward the trench axis.

Special investigation report : wing failure of Boeing 747-131, near Madrid, Spain, May 9, 1976.

Issued Oct. 6, 1978.

Food-chain relationships of iodine-131 in Nevada following the Sedan Test of July 1962 /

Prepared for the U.S Atomic Energy Commission.

Report relative to shellfish industry in New York Harbor. Report of Official Project no. 465-97-3-131.

Cover title: Sewage pollution effect on the shellfish and fishing industries.

Food-chain relationships of iodine-131 following two nuclear tests in Nevada,

Mode of access: Internet.

Biografía del licenciado en Farmacia D. Ramón Ruiz y Gómez, escrita en virtud de acuerdo del Colegio de Farmacéuticos de Madrid y leida el 21 de agosto de 1868 en la sesión pública del aniversario 131 de su institución oficial /

Mode of access: Internet.

Kritische Geschichte des spartanischen Staates von 500-131 v. Chr. mit Ausschlusz der Kriegsereignisse von 480 und 479 /

Besonderer Abdruck aus dem sechsten Supplementbande der Jahrbücher für classische Philologie. Supplementband 6.

A Verdade a passo lento, ou Guerra do escaravelho contra a borbolêta constitucional do Porto, os N.N. 131 e seguintes. Primeira proposição, em que se mostra a sua impiedade dada a' luz pelo inimigo declarado dos impostores, e verdadeiro constitucional.

Mode of access: Internet.

Organizational, direct support and general support maintenance repair parts and special tools list for small mobile water chiller (4130-01-131-2685).

Includes index.

DS, GS, and depot maintenance manual : maintenance kit MK-1035/ARC-131, (NSN 5821-00-935-0058).

Includes index.