Evidence for lysocline shoaling at the Paleocene/Eocene Thermal Maximum on Shatsky Rise, Northwest Pacific

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doi: 10.2973/odp.proc.sr.198.112.2006
Author(s): Colosimo, Amanda B.; Bralower, Timothy J.; Zachos, James C.
Ocean Drilling Program, Leg 198, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
University of North Carolina at Chapel Hill, Department of Geological Sciences, Chapel Hill, NC, United States
Other:
Universita di Milano, Italy
Ocean Drilling Program, United States
Pennsylvania State University, United States
Stanford University, United States
University College London, United Kingdom
Indiana University at Bloomington, United States
University of Florida, United States
University of Wales, United Kingdom
University of Michigan, United States
University of Queensland, Australia
Stockholm Universitet, Sweden
James Cook University of North Queensland, Australia
Tohoku University, Japan
University of Massachusetts at Amherst, United States
California State University, United States
Japan Marine Science and Technology Center, Japan
University of Oxford, United Kingdom
Universität Bremen, Federal Republic of Germany
Lamont-Doherty Earth Observatory, United States
University of California at Santa Cruz, United States
Volume Title: Proceedings of the Ocean Drilling Program; scientific results; extreme warmth in the Cretaceous and Paleogene; a depth transect on Shatsky Rise, Central Pacific; covering Leg 198 of the cruises of the drilling vessel JOIDES Resolution; Yokohama, Japan, to Honolulu, Hawaii; Sites 1207-1214; 27 August-23 October 2001
Volume Author(s): Bralower, Timothy J.; Premoli Silva, Isabella; Malone, Mitchell J.; Arthur, Michael A.; Averyt, Kristen B.; Bown, Paul R.; Brassell, Simon C.; Channell, James E. T.; Clarke, Leon J.; Dutton, Andrea; Eleson, Jason W.; Frank, Tracy D.; Gylesjo, Susanne; Hancock, Haidi J. L.; Kano, Harumasa; Leckie, R. Mark; Marsaglia, Kathleen M.; McGuire, Jennifer; Moe, K. T.; Petrizzo, Maria Rose; Robinson, Stuart A.; Röhl, Ursula; Sager, William W.; Takeda, Kotaro; Thomas, Deborah; Williams, Trevor; Zachos, James C.
Source: Proceedings of the Ocean Drilling Program; scientific results; extreme warmth in the Cretaceous and Paleogene; a depth transect on Shatsky Rise, Central Pacific; covering Leg 198 of the cruises of the drilling vessel JOIDES Resolution; Yokohama, Japan, to Honolulu, Hawaii; Sites 1207-1214; 27 August-23 October 2001, Timothy J. Bralower, Isabella Premoli Silva, Mitchell J. Malone, Michael A. Arthur, Kristen B. Averyt, Paul R. Bown, Simon C. Brassell, James E. T. Channell, Leon J. Clarke, Andrea Dutton, Jason W. Eleson, Tracy D. Frank, Susanne Gylesjo, Haidi J. L. Hancock, Harumasa Kano, R. Mark Leckie, Kathleen M. Marsaglia, Jennifer McGuire, K. T. Moe, Maria Rose Petrizzo, Stuart A. Robinson, Ursula Röhl, William W. Sager, Kotaro Takeda, Deborah Thomas, Trevor Williams and James C. Zachos; Ocean Drilling Program, Leg 198, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.198, 35p. 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. 51 refs.CD-ROM, ISSN 1096-2514; WWW, ISSN 1096-7451; illus., incl. 7 plates, 4 tables, sketch map
Summary: The Paleocene/Eocene Thermal Maximum (PETM) was a transient interval of global warming ∼55 m.y. ago associated with transformation of ecosystems and changes in carbon cycling. The event was caused by the input of massive amounts of CO2 or CH4 to the ocean-atmosphere system. Rapid shoaling of the lysocline and calcite compensation depth (CCD) is a predicted response of CO2 or CH4 input; however, the extent of this shoaling is poorly constrained. Investigation of Ocean Drilling Program (ODP) Sites 1209-1212 at Shatsky Rise, which lies along a depth transect, suggests a minimum lysocline shoaling of ∼500 m in the tropical Pacific Ocean during the PETM. The sites also show evidence of CaCO3 dissolution within the sediment column, carbonate "burn-down" below the level of the carbon isotope excursion, and a predicted response to a rapid change in deepwater carbonate saturation. Close examination of several foraminiferal preservation proxies (i.e., fragmentation, benthic/planktonic foraminiferal ratios, coarse fraction, and CaCO3 content) and observations of foraminifers reveal that increased fragmentation levels most reliably predict intervals with visually impoverished foraminiferal preservation as a result of dissolution. Low CaCO3 content and high benthic/planktonic ratios also mirror intervals of poorest preservation.
Year of Publication: 2006
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Aliphatic hydrocarbons; Alkanes; Biostratigraphy; Calcium carbonate; Carbon dioxide; Carbonate compensation depth; Cenozoic; Climate change; Eocene; Foraminifera; Hydrocarbons; Invertebrata; Leg 198; Lysoclines; Methane; Microfossils; North Pacific; Northwest Pacific; Ocean Drilling Program; Organic compounds; PETM; Pacific Ocean; Paleo-oceanography; Paleocene; Paleocene-Eocene Thermal Maximum; Paleoclimatology; Paleoenvironment; Paleogene; Paleotemperature; Protista; Reconstruction; Shatsky Rise; Shoaling; Tertiary; West Pacific
Coordinates: N313400 N374800 E1624600 E1571500
Record ID: 2006077745
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