Arney, James E. and Wise, Sherwood W., Jr. (2003): Paleocene-Eocene nannofossil biostratigraphy of ODP Leg 183, Kerguelen Plateau

Leg/Site/Hole:
ODP 183
ODP 183 1135
ODP 183 1136
ODP 183 1138
Identifier:
2006-060010
georefid

10.2973/odp.proc.sr.183.014.2003
doi

Creator:
Arney, James E.
Florida State University, Department of Geology, Tallahassee, FL, United States
author

Wise, Sherwood W., Jr.
University of Texas at Austin, United States
author

Identification:
Paleocene-Eocene nannofossil biostratigraphy of ODP Leg 183, Kerguelen Plateau
2003
In: Frey, Frederick A., Coffin, Millard F., Wallace, Paul J., Antretter, Maria J., Arndt, Nicholas T., Barling, Jane, Boehem, Florian, Borre, Mai Kirstine, Coxall, Helen K., Damuth, John E., Delius, Heike, Duncan, Robert A., Inokuchi, Hiroo, Keszthelyi, Laszlo, Mahoney, John J., Moore, C. Leah, Mueller, R. Dietmar, Neal, Clive R., Nicolaysen, Kirsten E., Pringle, Malcolm S., Reusch, Douglas N., Saccocia, Peter J., Teagle, Damon A. H., Waehnert, Veronika, Weis, Dominique A. M., Wise, Sherwood W., Zhao, Xixi, Quilty, Patrick G. (editor), Proceedings of the Ocean Drilling Program; scientific results; Kerguelen Plateau-Broken Ridge; a large igneous province; covering Leg 183 of the cruises of the drilling vessel JOIDES Resolution; Fremantle, Australia, to Fremantle, Australia; Sites 1135-1142; 7 December 1998-11 February 1999
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
183
Cores from Sites 1135, 1136, and 1138 of Ocean Drilling Program Leg 183 to the Kerguelen Plateau (KP) provide the most complete Paleocene and Eocene sections yet recovered from the southern Indian Ocean. These nannofossil-foraminifer oozes and chalks provide an opportunity to study southern high-latitude biostratigraphic and paleoceanographic events, which is the primary subject of this paper. In addition, a stable isotope profile was established across the Cretaceous/Tertiary (K/T) boundary at Site 1138. An apparently complete K/T boundary was recovered at Site 1138 in terms of assemblage succession, isotopic signature, and reworking of older (Cretaceous) nannofossil taxa. There is a significant color change, a negative carbon isotope shift, and nannofossil turnover. The placement of the boundary based on these criteria, however, is not in agreement with the available shipboard paleomagnetic stratigraphy. We await shore-based paleomagnetic study to confirm or deny those preliminary results. The Paleocene nannofossil assemblage is, in general, characteristic of the high latitudes with abundant Chiasmolithus, Prinsius, and Toweius. Placed in context with other Southern Ocean sites, the biogeography of Hornibrookina indicates the presence of some type of water mass boundary over the KP during the earliest Paleocene. This boundary disappeared by the late Paleocene, however, when there was an influx of warm-water discoasters, sphenoliths, and fasciculiths. This not only indicates that during much of the late Paleocene water temperatures were relatively equable, but preliminary floral and stable isotope analyses also indicate that a relatively complete record of the late Paleocene Thermal Maximum event was recovered at Site 1135. It was only at the beginning of the middle Eocene that water temperatures began to decline and the nannofossil assemblage became dominated by cool-water species while discoaster and sphenolith abundances and diversity were dramatically reduced. One new taxonomic combination is proposed, Heliolithus robustus Arney, Ladner, and Wise.
English
Coverage:Geographic coordinates:
North:-53.5506
West:75.5830East: 84.5006
South:-59.4200

Stratigraphy; algae; biostratigraphy; C-13/C-12; carbon; Cenozoic; Cretaceous; Eocene; Indian Ocean; isotope ratios; isotopes; K-T boundary; Kerguelen Plateau; Leg 183; lower Paleocene; Mesozoic; microfossils; nannofossils; O-18/O-16; Ocean Drilling Program; ODP Site 1135; ODP Site 1136; ODP Site 1138; oxygen; paleo-oceanography; Paleocene; paleoenvironment; Paleogene; paleotemperature; Plantae; reconstruction; Southern Ocean; species diversity; stable isotopes; stratigraphic boundary; Tertiary; Upper Cretaceous;

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