Neogene foraminifers and accessories, ODP Leg 188, Sites 1165, 1166 and 1167, Prydz Bay, Antarctica

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doi: 10.2973/
Author(s): Quilty, Patrick G.
Ocean Drilling Program, Leg 188, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
University of Tasmania, School of Earth Sciences, Hobart, Tasmania, Australia
Australian Geological Survey Organisation, Australia
Ocean Drilling Program, United States
University of Leicester, United Kingdom
University of Nebraska, United States
University of Texas at Arlington, United States
Oxford University, United Kingdom
Istituto Nazionale di Geofisica e Vulcanologia, Italy
Norwegian Polar Institute, Norway
Christan-Albrechts-Universität zu Kiel, Federal Republic of Germany
University of Utah, United States
University of Toronto at Scarborough, Canada
Curtin University of Technology, Australia
Boston University, United States
British Antarctic Survey, United Kingdom
Ohio State University, United States
Florida State University, United States
University of Tasmania, Australia
Istituto Nazionale di Oceanografia e di Geofisico Sperimentale, Italy
University of Oulu, Finland
Jacques Whitford and Associates, Canada
California State University, United States
Lamont-Doherty Earth Observatory, United States
Volume Title: Proceedings of the Ocean Drilling Program; scientific results; Prydz Bay-Cooperation Sea, Antarctica; glacial history and paleoceanography; covering Leg 188 of the cruises of the drilling vessel JOIDES Resolution; Fremantle, Australia, to Hobart, Tasmania; Sites 1165-1167; 10 January-11 March 2000
Volume Author(s): Cooper, Alan K.; O'Brien, Philip E.; Richter, Carl; Barr, Samantha R.; Bohaty, Steven M.; Claypool, George E.; Damuth, John E.; Erwin, Patrick S.; Florindo, Fabio; Forsberg, Carl Fredrik; Grützner, Jens; Handwerger, David A.; Januszczak, Nicole N.; Kaiko, Alexander; Kryc, Kelly A.; Lavelle, Mark; Passchier, Sandra; Pospichal, James J.; Quilty, Patrick G.; Rebesco, Michele A.; Strand, Kari O.; Taylor, Brian; Theissen, Kevin M.; Warnke, Detlef A.; Whalen, Patricia A.; Whitehead, Jason M.; Williams, Trevor
Source: Proceedings of the Ocean Drilling Program; scientific results; Prydz Bay-Cooperation Sea, Antarctica; glacial history and paleoceanography; covering Leg 188 of the cruises of the drilling vessel JOIDES Resolution; Fremantle, Australia, to Hobart, Tasmania; Sites 1165-1167; 10 January-11 March 2000, Alan K. Cooper, Philip E. O'Brien, Carl Richter, Samantha R. Barr, Steven M. Bohaty, George E. Claypool, John E. Damuth, Patrick S. Erwin, Fabio Florindo, Carl Fredrik Forsberg, Jens Grützner, David A. Handwerger, Nicole N. Januszczak, Alexander Kaiko, Kelly A. Kryc, Mark Lavelle, Sandra Passchier, James J. Pospichal, Patrick G. Quilty, Michele A. Rebesco, Kari O. Strand, Brian Taylor, Kevin M. Theissen, Detlef A. Warnke, Patricia A. Whalen, Jason M. Whitehead and Trevor Williams; Ocean Drilling Program, Leg 188, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.188, 41p. 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 and HTML. 50 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; 1 plate, 7 tables, sketch map
Summary: Foraminifers are reported from Ocean Drilling Program (ODP) Leg 188, Sites 1165, 1166, and 1167 in and near Prydz Bay, off East Antarctica. Assemblages are generally sporadic and do little to provide a chronostratigraphic framework for the aims of Leg 188. Dissolution below the carbonate compensation depth (CCD) has been a major factor controlling preservation of some assemblages. Descriptions of each section include reference to the significance of accessory components such as other non-foraminifer microfossils and some minerals. The composition of the early Miocene and younger assemblages at Site 1165 suggests that they are in situ or are at the depth where they accumulated. The occurrences, apparently in situ, of Globigerina bulloides in Sample 188-1165A-1H-CC and an assemblage (also recorded on southern Kerguelen Plateau) including Globorotalia puncticulata and Globorotalia scitula in Quaternary sediments of Sample 188-1165B-2H-2, 70-75 cm, support the longer range for G. puncticulata and indicate a short interval of warmer-water conditions in the early Pleistocene. Accessory microfossils are important indices in the section. A major change in environment is obvious in Core 188-1165B-25X (middle-late Miocene transition; approximately Chron C5R). Above this level glauconite becomes a regular component of samples, possibly reflecting an influx of reworked material from Paleogene sediments on the nearby Mac. Robertson Shelf. Another change is evident at the base of Core 188-1165B-58X (latest early Miocene; Chron C5Dr) where sponge spicules and orosphaerid radiolarians become regular components, perhaps marking a significant cooling event. These radiolarians disappear uphole at Section 188-1165B-34X-CC within the middle Miocene (Subchron C5Abr-Acr). Site 1166, although penetrating rocks as old as Cretaceous, yielded foraminifers only from the Neogene. The total benthic assemblage is diverse, but agglutinated species are rare. Conditions of deposition were fully marine through the Neogene in an open shelf environment. No effects of dissolution are obvious; the planktonic Neogloboquadrina pachyderma dominates. Recycled Permian coal is a normal accessory throughout the section, and younger fossil wood and lignite are present at and below Section 188-1166-17R-CC. Foraminifer linings in palynological residues in the Paleogene section are consistent with estuarine conditions at that time. Foraminifers are recorded throughout the 447.5-m Quaternary section in Hole 1167A on the mid-continental slope north of Prydz Bay. The foraminifer assemblages alone are of little value in establishing the age of the section but yielded enough for Sr dating and 18O studies. Presence/absence and features of the benthic component are used to divide the section into six units: 1. 0.6 meters below seafloor (mbsf): modern. 2. 2.1-33.7 mbsf: low foraminifer numbers and little else. 3. 34.3-54.7 mbsf: higher foraminifer numbers and significant other biota. 4. 64.3-98.1 mbsf: low foraminifer numbers. 5. 99.6-208.6 mbsf: highest foraminifer numbers and most diverse other biota. 6. 210.1-447.5 mbsf: very low foraminifer numbers, many barren samples, and little else. Foraminifer numbers are low, and other biota are represented by fragments. Opaline siliceous fossils are virtually absent. Most Site 1167 assemblages have moved from the continental shelf, where they lived, to the continental slope, where they accumulated. Benthic assemblages are dominated by spherical and tapered infauna that probably lived at ∼250-400 m water depth and have been transported to current depths through the mechanism of debris flow. A few thin horizons contain assemblages that are consistent with accumulation in the mid-bathyal realm and thus may not have moved since deposition. The site is near the current CCD, and movement of this surface over time probably accounts for many of the absences.
Year of Publication: 2004
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Antarctica; Assemblages; Biostratigraphy; Cenozoic; Chronostratigraphy; Cores; Correlation; Foraminifera; Glacial environment; Glaciomarine environment; Invertebrata; Isotope ratios; Isotopes; Leg 188; Marine environment; Microfossils; Neogene; O-18/O-16; ODP Site 1165; ODP Site 1166; ODP Site 1167; Ocean Drilling Program; Oxygen; Paleo-oceanography; Paleoenvironment; Protista; Prydz Bay; Southern Ocean; Species diversity; Stable isotopes; Taxonomy; Tertiary
Coordinates: S662400 S662400 E0721800 E0721700
S674200 S674100 E0744800 E0744700
S642300 S642200 E0671400 E0671300
Record ID: 2004083816
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