Identification:
Title:
Relative abundance and stratigraphic ranges of selected diatoms from Miocene sections at ODP sites 689, 690, 1088, and 1092 (Atlantic sector of the Southern Ocean)
Year:
2003
Source:
In: Gersonde, Rainer, Hodell, David A., Blum, Peter, Andersson, Carin, Austin, William E. N., Billups, Katharina, Channell, James E. T., Charles, Christopher D., Diekmann, Bernhard, Filippelli, Gabriel M., Flores, Jose-Abel, Hewitt, Antony T., Howard, William R., Ikehara, Minoru, Janecek, Thomas R., Kanfoush, Sharon L., Kemp, Alan E. S., King, Stagg L., Kleiven, Helga Flesche, Kuhn, Gerhard, Marino, Maria, Ninnemann, Ulysses S., O'Connell, Suzanne, Ortiz, Joseph D., Stoner, Joseph S., Sugiyama, Kazuhiro, Warnke, Detlef A., Zielinski, Ulrich, Proceedings of the Ocean Drilling Program, scientific results; Southern Ocean paleoceanography; covering Leg 177 of the cruises of the drilling vessel JOIDES Resolution; Cape Town, South Africa, to Punta Arenas, Chile; sites 1088-1094; 9 December 1997-5 February 1998
Publisher:
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
Volume:
177
Issue:
Pages:
Abstract:
During Leg 177, a total of 4000 m of sediment cores was recovered at seven sites arrayed along a north-south transect from 41 degrees to 53 degrees S, crossing each of the frontal boundaries of the Antarctic Circumpolar Current (ACC). At most sites, multiple holes were drilled to ensure complete recovery of the stratigraphic section. A complete description of the Leg 177 sediments recovered and shipboard analyses performed is given in the Leg 177 Initial Reports volume. One scientific objective of Leg 177 was the improvement of the Cenozoic biostratigraphic zonations for siliceous microfossils and their direct correlation to the geomagnetic polarity record. These studies improve previous stratigraphic zonations of the Miocene, Pliocene, and Pleistocene. Both studies revealed latitude-dependent differences in the stratigraphic ranges of biostratigraphic marker species related to the paleoceanographic development of surface water masses within the ACC during the Neogene and Pleistocene. As a consequence of the latitudinal differentiation of diatom occurrences and stratigraphic ranges, specific zonations for application in the northern and southern realm of the Southern Ocean have been proposed. Here we present the relative abundance pattern and the ranges of stratigraphically useful diatoms obtained from middle and late Miocene sections of Ocean Drilling Program (ODP) Leg 177 Sites 1088 and 1092, located in the northern Subantarctic Zone and the northern Polar Front Zone of the Antarctic Circumpolar Current (ACC) and from ODP Leg 113 Sites 689 and 690 recovered on Maud Rise close to the Antarctic continent. This set of data is the base of the diatom stratigraphic interpretation presented in Censarek and Gersonde (2002). The study of the Sites 689 and 690 represents a reevaluation of a diatom biostratigraphic zonation initially proposed by Gersonde and Burckle (1990). Censarek and Gersonde (2002) considered revisions in diatom taxonomy and based their study on diatom counts, whereas the study of Gersonde and Burckle (1990) relies on abundance estimates only.
Language:
English
Genre:
Serial
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