Eocene-Oligocene planktonic foraminiferal biostratigraphy of Sites 1126, 1130, 1132, and 1134, ODP Leg 182, Great Australian Bight

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doi: 10.2973/odp.proc.sr.182.006.2003
Author(s): Li, Qianyu; McGowran, Brian; James, Noel P.
Ocean Drilling Program, Leg 182, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
University of Adelaide, Department of Geology and Geophysics, Adelaide, South. Aust., Australia
Other:
Australian Geological Survey Organisation, Australia
Texas A&M University, United States
Eidgenössische Technische Hochschule-Zentrum, Switzerland
Johann Wolfgang Goethe-Universität, Federal Republic of Germany
Eckerd College, United States
University of Southern Mississippi, United States
University of Hawaii, United States
University of New Mexico, United States
Natural History Museum, United Kingdom
Aarhus Universitet, Denmark
University of Sydney, Australia
Queen's University at Kingston, Canada
Florida State University, United States
University of Adelaide, Australia
Japan Marine Science and Technology Center, Japan
Kumamoto University, Japan
University of Texas at Dallas, United States
Université Pierre et Marie Curie, France
University of California at San Diego, United States
University of Wisconsin at Madison, United States
University of Bristol, United Kingdom
University of Leicester, United Kingdom
Kobenhavns Universitet, Denmark
University of Miami, United States
Volume Title: Proceedings of the Ocean Drilling Program; scientific results; Great Australian Bight; Cenozoic cool-water carbonates; covering Leg 182 of the cruises of the drilling vessel JOIDES Resolution; Wellington, New Zealand, to Fremantle, Australia; Sites 1126-1134, 8 October-7 December 1998
Volume Author(s): Hine, Albert C.; Feary, David A.; Malone, Mitchell J.; Andres, Miriam; Betzler, Christian; Brooks, Gregg R.; Brunner, Charlotte A.; Fuller, Michael; Molina Garza, Roberto S.; Holbourn, Ann E.; Huuse, Mads; Isern, Alexandra R.; James, Noel P.; Ladner, Bryan C.; Li, Qianyu; Machiyama, Hideaki; Mallinson, David J.; Matsuda, Hiroki; Mitterer, Richard M.; Robin, Cécile; Russell, Joellen L.; Shafik, Samir; Simo, J. A.; Smart, Peter L.; Spence, Guy H.; Surlyk, Finn C.; Swart, Peter K.; Wortmann, Ulrich G.
Source: Proceedings of the Ocean Drilling Program; scientific results; Great Australian Bight; Cenozoic cool-water carbonates; covering Leg 182 of the cruises of the drilling vessel JOIDES Resolution; Wellington, New Zealand, to Fremantle, Australia; Sites 1126-1134, 8 October-7 December 1998, Albert C. Hine, David A. Feary, Mitchell J. Malone, Miriam Andres, Christian Betzler, Gregg R. Brooks, Charlotte A. Brunner, Michael Fuller, Roberto S. Molina Garza, Ann E. Holbourn, Mads Huuse, Alexandra R. Isern, Noel P. James, Bryan C. Ladner, Qianyu Li, Hideaki Machiyama, David J. Mallinson, Hiroki Matsuda, Richard M. Mitterer, Cécile Robin, Joellen L. Russell, Samir Shafik, J. A. Simo, Peter L. Smart, Guy H. Spence, Finn C. Surlyk, Peter K. Swart and Ulrich G. Wortmann; Ocean Drilling Program, Leg 182, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.182, 28p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 1096-2514
Note: In English. Available only on CD-ROM in PDF format and on the Web in PDF or HTML; includes appendix. 58 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; illus., incl. 4 plates, sketch map
Summary: Planktonic foraminiferal results indicate that Paleogene sediments recovered at Sites 1126, 1130, 1132, and 1134 in the Great Australian Bight are of middle Eocene-late Oligocene age, in intervals equivalent to (sub)tropical Zones P12-P22. The southern temperate assemblage hosted several subtropical species in the middle-late Eocene and late Oligocene as immigrants probably transported by a warm-water system similar to the present-day Leeuwin Current. The four major hiatuses recognized or inferred fall (1) between Zones P12-13 and P15 in the middle Eocene, (2) within Zone P15, (3) between Zones P16 and P18 across the Eocene/Oligocene boundary, and (4) between Zones P19 and P20 and Subzone P21b in the mid-Oligocene. These unconformities represent region-wide events across the southern Australian margin, corresponding to global sequence boundaries Part-1 (39.1 Ma), Pr1 + Pr2 (37.1-36.0 Ma), Pr4/Ru1 (33.7 Ma), and Ru4/Ch1 (28.5 Ma), respectively. Unconformities at Site 1130 had a longer duration as lower Oligocene ooze with Zone P18-P19 species overlying a middle Eocene sandy limestone of Zone P12 age and the whole Oligocene were condensed to only half as thick as the coeval sediments from up- and downslope, indicating stronger erosion at this upper slope locality during the late Eocene. The biostratigraphic results confirm previous studies of the neritic record, reporting that carbonate deposition began in the middle Eocene probably as a response to global warming and marginal subsidence because of the accelerated seafloor spreading between Australia and Antarctica at ∼43 Ma.
Year of Publication: 2004
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Biostratigraphy; Cenozoic; Cores; Correlation; Eocene; Foraminifera; Great Australian Bight; Indian Ocean; Invertebrata; Leg 182; Microfossils; ODP Site 1126; ODP Site 1130; ODP Site 1132; ODP Site 1134; Ocean Drilling Program; Ocean floors; Oligocene; Paleogene; Planktonic taxa; Protista; Stratigraphic boundary; Tertiary
Coordinates: S342330 S331720 E1285500 E1271500
Record ID: 2005041664
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