Palynology of Neogene slope and rise deposits from ODP Sites 1165 and 1167, East Antarctica

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doi: 10.2973/odp.proc.sr.188.012.2004
Author(s): Macphail, M. K.; Truswell, E. M.
Ocean Drilling Program, Leg 188, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
Australian National University, Department of Archaeology and Natural History, Canberra, Australia
Other:
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, 20p. 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. 29 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; 3 tables, 4 plates
Summary: Sites 1165 and 1167 were drilled on the continental slope and rise seaward of Prydz Bay, East Antarctica. The sediments penetrated are glacigene and independently dated as Neogene age (early Miocene and younger) using diatoms, radiolarians, nannofossils, and paleomagnetic data. In this depositional setting, most, though not all, palynomorphs recovered are not in situ but have been recycled from older sequences. However, a number of dinoflagellate cyst taxa recovered from Site 1165 support a Neogene age, although their stratigraphic distribution requires further study. They include species referable to the genera Batiacasphaera, Protoellipsodinium, cf. Cymatiosphaera, and Svalbardella. Fossil pollen and spores recovered from Site 1165 include a spore species that appears to be diagnostic of early Miocene sediments encountered in the Cape Roberts Project drill hole CRP-1 in the Ross Sea. The presence of this species, referred to as Coptospora sp. b, strengthens the case that some other spore and pollen species may be in situ, and that a woody tundra vegetation of shrubby gymnosperms and Southern Beech (Nothofagus) survived in East Antarctica into Miocene time. Recycled plant microfossils range in age from Permian and Early Jurassic to late Eocene and Oligocene. Permian taxa are most abundant on the continental shelf (Site 1167), implying that this component was transported in lithified sediments as part of the coarse bed load. Possible source beds are present in the Prince Charles Mountains. Cretaceous-Paleogene microfossils are more abundant on the continental rise (Site 1165). Early Jurassic taxa, present at both sites, reflect close floristic links between East Antarctica, southwestern Australia, and India during the Mesozoic. Beds of this age are known from the MacRobertson Shelf, west of Prydz Bay. Late Cretaceous taxa reflect Turonian-?Santonian sediments; these are known from Sites 1166 and 742 within Prydz Bay. Relative abundance data for Site 1167 are consistent with a simple glacial unroofing model in that Permian and Jurassic-Early Cretaceous plant microfossils are most frequent in the upper part of the sequence; Paleogene-Neogene are more common in the basal intervals. The situation is less clear at Site 1165, where the obverse situation is apparent, with Permian and Jurassic taxa most abundant in the basal part of the section.
Year of Publication: 2004
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Antarctica; Biostratigraphy; Biozones; Cenozoic; Continental rise; Continental slope; Dinoflagellata; East Antarctica; Leg 188; Microfossils; Miospores; Neogene; ODP Site 1165; ODP Site 1167; Ocean Drilling Program; Ocean floors; Paleoclimatology; Palynomorphs; Pollen; Prydz Bay; Reconstruction; Southern Ocean; Species diversity; Taxonomy; Tertiary
Coordinates: S662400 S662400 E0721800 E0721700
S642300 S642200 E0671400 E0671300
Record ID: 2004083814
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