Leg 208 synthesis; Cenozoic climate cycles and excursions

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doi: 10.2973/odp.proc.sr.208.201.2007
Author(s): Kroon, Dick; Zachos, James C.
Ocean Drilling Program, Leg 208, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
Vrije Universiteit, Faculty of Earth Sciences, Amsterdam, Netherlands
Other:
University of California, Santa Cruz, United States
Ocean Drilling Program, United States
Scripps Institution of Oceanography, United States
Université de Montpellier II, France
Kanazawa University, Japan
Open University, United Kingdom
University of Florida, United States
University of Wisconsin-Madison, United States
Pukyong National University, South Korea
Korea Institute of Geoscience and Mineral Resources, South Korea
Universität Leipzig, Federal Republic of Germany
Tongji University, China
University of Michigan, United States
Utrecht University, Netherlands
Universita di Firenze, Italy
Rice University, United States
Universitariá "G. D'Annunzio", Italy
Stanford University, United States
Universität Bremen, Federal Republic of Germany
San Diego State University, United States
Royal Holloway University of London, United Kingdom
University of North Carolina at Chapel Hill, United States
Wesleyan University, United States
Geological Survey of Finland, Finland
Volume Title: Proceedings of the Ocean Drilling Program; scientific results; early Cenozoic extreme climates; the Walvis Ridge Transect; covering Leg 208 of the cruises of the drilling vessel JOIDES Resolution; Rio de Janeiro, Brazil, to Rio de Janeiro, Brazil; Sites 1262-1267; 6 March-6 May 2003
Volume Author(s): Kroon, Dick; Zachos, James C.; Blum, Peter; Bowles, Julie; Gaillot, Philippe; Hasegawa, Takashi; Hathorne, Edmund C.; Hodell, David A.; Kelly, Daniel C.; Jung, Ja-Hun; Keller, Susan M.; Lee, Youn Soo; Leuschner, Dirk C.; Liu Zhifei; Lohmann, Kyger C.; Lourens, Lucas; Monechi, Simonetta; Nicolo, Micah; Raffi, Isabella; Riesselman, Christina; Röhl, Ursula; Schellenberg, Stephen A.; Schmidt, Daniela; Sluijs, Appy; Thomas, Deborah; Thomas, Ellen; Vallius, Henry
Source: Proceedings of the Ocean Drilling Program; scientific results; early Cenozoic extreme climates; the Walvis Ridge Transect; covering Leg 208 of the cruises of the drilling vessel JOIDES Resolution; Rio de Janeiro, Brazil, to Rio de Janeiro, Brazil; Sites 1262-1267; 6 March-6 May 2003, Dick Kroon, James C. Zachos, Peter Blum, Julie Bowles, Philippe Gaillot, Takashi Hasegawa, Edmund C. Hathorne, David A. Hodell, Daniel C. Kelly, Ja-Hun Jung, Susan M. Keller, Youn Soo Lee, Dirk C. Leuschner, Liu Zhifei, Kyger C. Lohmann, Lucas Lourens, Simonetta Monechi, Micah Nicolo, Isabella Raffi, Christina Riesselman, Ursula Röhl, Stephen A. Schellenberg, Daniela Schmidt, Appy Sluijs, Deborah Thomas, Ellen Thomas and Henry Vallius; Ocean Drilling Program, Leg 208, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.208, 55p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 1096-2514
Note: In English. 137 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; illus., incl. sects., sketch map
Summary: During Ocean Drilling Program Leg 208, six sites were drilled at water depths between 2500 and 4770 m to recover Cenozoic sediments on the northeastern flank of Walvis Ridge. Previous drilling in this region (Deep Sea Drilling Project [DSDP] Leg 74) recovered pelagic oozes and chalk spanning the Cretaceous/Paleogene (K/Pg), Paleocene/Eocene, and Eocene/Oligocene boundaries. The composite sections, recovered via double and triple coring, provide a detailed history of paleoceanographic variation associated with several prominent episodes of early Cenozoic climate change, including the K/Pg boundary, Paleocene/ Eocene Thermal Maximum (PETM), early Eocene Climatic Optimum, and early Oligocene Glacial Maximum. The PETM interval, the main target of Leg 208, was recovered at five sites along a depth transect of 2.2 km. A prominent red clay layer marks the boundary sequence at all sites. Additionally, two as-yet undocumented early Eocene hyperthermal events were recovered: Elmo and X, dated at ∼53.5 and ∼52 Ma, respectively. A number of postcruise investigations were undertaken on these critical intervals, principally to improve stratigraphic control and the resolution of proxy records of climate and ocean chemistry, and to better understand the regional impacts of these events on biota. The major contributions of Leg 208 include (1) development of new orbitally tuned chronologies for the Paleocene and lower Eocene, (2) high-resolution characterization of Paleocene/Eocene boundary carbonate dissolution horizons and correlation to the carbon isotope excursion and PETM, (3) development of the first marine-based carbon isotope record of terrestrial n-alkanes for the PETM, (4) documentation of the ecological impacts of the PETM on calcareous algae, (5) resolving the full magnitude of the carbonate compensation depth shift as well as its timing relative to the onset of Antarctic glaciation in the earliest Oligocene, (6) coupling the middle Miocene high abundances of biserial planktonic foraminifers to changes in regional ocean circulation, (7) constraining the timing of initiation and intensification of North Atlantic Deep Water formation in the Oligocene, (8) increasing the resolution of the Li isotope record for the Neogene, and (9) increasing the resolution of the seawater Sr isotope record for the upper Paleocene and lower Eocene.
Year of Publication: 2007
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 20 Geophysics, Applied; Algae; Alkali metals; Atlantic Ocean; Biostratigraphy; Boreholes; C-13/C-12; Calcareous algae; Calcium carbonate; Carbon; Carbonate sediments; Cenozoic; Chemostratigraphy; Chronostratigraphy; Cores; Cretaceous; Cyclostratigraphy; Event stratigraphy; Foraminifera; Geochemistry; Geophysical methods; Geophysical profiles; Geophysical surveys; Grain size; Invertebrata; Isotope ratios; Isotopes; K-T boundary; Leg 208; Li-7/Li-6; Lithium; Lithostratigraphy; Lower Paleocene; Magnetic properties; Magnetic susceptibility; Magnetostratigraphy; Marine sediments; Mass extinctions; Mesozoic; Metals; Microfossils; Nannofossils; O-18/O-16; ODP Site 1262; ODP Site 1263; ODP Site 1264; ODP Site 1265; ODP Site 1266; ODP Site 1267; Ocean Drilling Program; Oxygen; Paleo-oceanography; Paleocene; Paleoclimatology; Paleogene; Paleomagnetism; Plantae; Protista; Sediments; Seismic methods; Seismic profiles; Seismic stratigraphy; Size distribution; South Atlantic; Southeast Atlantic; Stable isotopes; Stratigraphic boundary; Surveys; Terrigenous materials; Tertiary; Upper Cretaceous; Walvis Ridge
Coordinates: S290000 S270000 E0030000 E0013000
Record ID: 2007087736
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