Total organic carbon, metal concentrations and metal and aluminium ratios in bulk sediment from the ODP sample 169-1033B-4H-4,54-74

Holocene laminated sediments in Saanich Inlet, British Columbia, are interrupted by frequent, non-laminated, massive layers. These layers may be debris flows released by earthquakes or bioturbated sediments deposited during periods of relatively high bottom water oxygen concentration and/or low surface productivity, or both. We determined the organic carbon content and the concentration of a suite of redox-sensitive metals in bulk sediments at approximately 1-cm resolution across a laminated-massive-laminated interval (ODP Leg 169S Sample 1033B-4H-4,54-74), to determine the redox conditions under which the massive layer was deposited. Our results indicate that this massive interval was deposited under anoxic bottom waters. Manganese/Al ratios are consistently low throughout the massive section, while Mo/Al, Cd/Al, Re/Al, and U/Al ratios are enriched relative to their metal/Al ratios in detrital material (represented by Cowichan River suspended sediments). The concentration of organic carbon in the lower portion of the massive layer is higher than in the upper portion, which has a concentration similar to that in the overlying and underlying laminated sediments. Well-defined peaks in Mo/Al, Cd/Al, and Re/Al and a broad peak in U/Al occur in the lower portion of the massive layer. The positions of the Cd/Al, Re/Al, and Mo/Al peaks, as well as the increase in organic carbon content with depth in the massive layer, are best explained by a process of diagenetic redistribution of metals that occurred after the massive layer was emplaced.

(Table 1) Compositional variation with depth in a nodule of sediment sample RVG-10D

A detailed study of a nodule from the Somali Basin dated by 230Thexcess was correlated with the paleoceanographic events recorded in Site 236 (Leg 24) Deep Sea Drilling Project (DSDP) cores. Tentative indications are that the phase of nodule accretion starting with the development of pillar structure at a depth of 20 mm in the nodule around 13 Ma coincides with increased Antarctic Bottom Water (AABW) flow and an elevated calciumcarbonate compensation depth (CCD). The Late Miocene lowering of the CCD is represented by the mottled zones between 8 and 18 mm in the nodule is characterised by an abundant silicate component (>20%) of aeolian origin. The Miocene/Pliocene boundary (5 Ma) occurs at a depth of about 8 mm and is represented by the development of pillar structure and a minimum of aeolian dust (10.3%). The increased biological productivity of the Somali surface water since the Middle Miocene is demonstrated by the increasing Corg content of the nodule (from 0.11 to 0.19%) towards its surface.

Comparison of methods for the determination of total available residual chlorine in various sample matrices /

Bibliography: p. 28-29.

Asbestos-containing materials in school buildings : bulk sample analysis quality assurance program : bulk sample rounds 16, 17 and 18 /

Mode of access: Internet.

Beryllium sampling methods: Comparison of two personal sample collection methods with the AEC sample collection method as used for one year in a beryllium production facility. /

Item 499-F-2

A study of sample size in making decisions about instructional materials /

Project No. 711151.01.

Location decisions and industrial mobility in Michigan, 1961; a sample survey of Michigan and Ohio manufacturers conducted by the Survey Research Center of the University of Michigan.

Bibliographical footnotes.

Drug treatment histories for a sample of drug users in DARP.

Mode of access: Internet.

Illinois Measure of Annual Growth in English [IMAGE] : reading & writing : sample materials, grades 6-8 /

IMAGE is a state test of English reading and writing proficiency developed specifically for Illinois' limited-English-proficient students in grades 9-11.

Consequences of small sample 0-D data collection in the transportation planning process /

Mode of access: Internet.

Tables describing small-sample properties of the mean, median, standard deviation, and other statistics in sampling from various distributions /

Mode of access: Internet.

Sample catalog cards, for use in connection with courses in technical services in libraries and organization of materials.

Mode of access: Internet.

Accuracy in trace analysis : sampling, sample handling, analysis : proceedings of the 7th Materials Research Symposium held at the National Bureau of Standards, Gaithersburg, Md., October 7-11, 1974 /

Includes bibliographical references.

Sample wage dispersions of five jobs in nonmanufacturing enterprises of a local community.

At head of title: Preliminary and confidential. Copy no. 13.