Stable carbon isotope record and geochemistry of late Miocene-early Pliocene sediments from DSDP Site 90-590 in the Tasman Sea

Biogenic components of sediment accumulated at high rates beneath frontal zones of the Indian and Pacific oceans during the late Miocene and early Pliocene. The delta13C of bulk and foraminiferal carbonate also decreased during this time interval. Although the two observations may be causally linked, and signify a major perturbation in global biogeochemical cycling, no site beneath a frontal zone has independent records of export production and delta13C on multiple carbonate phases across the critical interval of interest. Deep Sea Drilling Project (DSDP) site 590 lies beneath the Tasman Front (TF), an eddy-generating jetstream in the southwest Pacific Ocean. To complement previous delta13C records of planktic and benthic foraminifera at this location, late Neogene records of CaCO3 mass accumulation rate (MAR), Ca/Ti, Ba/Ti, Al/Ti, and of bulk carbonate and foraminiferal delta13C were constructed at site 590. The delta13C records include bulk sediment, bulk sediment fractions (<63 µm and 5-25 µm), and the planktic foraminifera Globigerina bulloides, Globigerinoides sacculifer (with and without sac), and Orbulina universa. Using current time scales, CaCO3 MARs, Ca/Ti, Al/Ti and Ba/Ti ratios are two to three times higher in upper Miocene and lower Pliocene sediment relative to overlying and underlying units. A significant decrease also occurs in all delta13C records. All evidence indicates that enhanced export production - the 'biogenic bloom' - extended to the southwest Pacific Ocean between ca. 9 and 3.8 Ma, and this phenomenon is coupled with changes in delta13C - the 'Chron C3AR carbon shift'. However, CaCO3 MARs peak ca. 5 Ma whereas elemental ratios are highest ca. 6.5 Ma; foraminiferal delta13C starts to decrease ca. 8 Ma whereas bulk carbonate delta13C begins to drop ca. 5.6 Ma. Temporal discrepancies between the records can be explained by changes in the upwelling regime at the TF, perhaps signifying a link between changes in ocean-atmosphere circulation change and widespread primary productivity.

Characterization of priority pollutants from a secondary lead and battery manufacturing facility /

Jan. 1979.

Corporations; a study of the origin and development of great business combinations and of their relation to the authority of the state.

Mode of access: Internet.

Rerum Britannicarum medii ævi scriptores, or, Chronicles and memorials of Great Britain and Ireland during the Middle Ages.

Mode of access: Internet.

The bibliographer's manual of English literature containing an account of rare, curious, and useful books, published in or relating to Great Britain and Ireland, from the invention of printing; with bibliographical and critical notices, collations of the rarer articles, and the prices at which they have been sold.

Vol. 6 has special title: Appendix to the Bibliographer's manual of English literature. Containing an account of books issued by literary and scientific societies and printing clubs; books printed at private presses; privately printed series; and the principal literary and scientific serials. Comp. by Henry G. Bohn ...

Source separation : the community awareness program in Somerville and Marblehead, Massachusetts /

Mode of access: Internet.

The assault and other war poems from "Ardours and endurance" /

Mode of access: Internet.

Chemoprevention clinical trials : problems and solutions /

"November 1984."

The flowering plants and ferns of Great Britain.

Mode of access: Internet.

Thames and Severn Canal : Copy of memorial presented to the Board of Trade on the 29th November ultimo, by the public and canal navigations interested, with respect to the acquisition by the Great Western Railway Company of the Thames and Severn Canal, and the subsequent correspondence which has arisen thereon.

Title from back cover.

Guide leaflet, geological science field trip, Wheaton area : DuPage and Kane Counties, Wheaton, Barrington, Elgin and Geneva quadrangles /

April 29, 1962.

Multimaterial source separation in Marblehead and Somerville, Massachusetts /

December 1979.

Texas and the Massachusetts resolutions.

Mode of access: Internet.

Second history of Charlestown, N.H., the Old Number Four; embracing a summary of the early history of the town from its settlement to 1876 and more particularly developments and events in the town from 1876 to 1954.

Bibliography: p. 430-433.