Carbonate dissolution episodes in Paleocene and Eocene sediment, Shatsky Rise, west-central Pacific

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doi: 10.2973/odp.proc.sr.198.116.2005
Author(s): Hancock, Haidi J. L.; Dickens, Gerald R.
Ocean Drilling Program, Leg 198, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
James Cook University of North Queensland, Department of Earth Sciences, Townsville, Queensl., Australia
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
Rice University, 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, 24p. 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. 40 refs.CD-ROM, ISSN 1096-2514; WWW, ISSN 1096-7451; illus., incl. 2 tables, sketch map
Summary: Holes 1209A and 1211A on Southern High, Shatsky Rise contain expanded, nearly continuous records of carbonate-rich sediment deposited in deep water of the equatorial Pacific Ocean during the Paleocene and Eocene. In this study, we document intervals of carbonate dissolution in these records by examining temporal changes in four parameters: carbonate content, coarse size fraction (>38 µm), benthic foraminiferal abundance, and planktonic foraminiferal fragmentation ratio. Carbonate content is not a sensitive indicator of carbonate dissolution in the studied sections, although rare intervals of low carbonate may reflect times of relatively high dissolution. The proportion of coarse size fraction does not accurately record carbonate dissolution either because the relative abundance of nannofossils largely determines the grain-size distribution. Benthic abundance and fragmentation covary (r2 = 0.77) and are probably the best indicators for carbonate dissolution. For both holes, records of these parameters indicate two episodes of prominent dissolution. The first of these occurs in the upper Paleocene (∼59-58 Ma) and the second in the middle to upper Eocene (∼45-33.7 Ma). Other intervals of enhanced carbonate dissolution are located in the upper Paleocene (∼56 Ma) and in the upper lower Eocene (∼51 Ma). Enhanced preservation of planktonic foraminiferal assemblages marks the start of both the Paleocene and Eocene epochs.
Year of Publication: 2006
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Biostratigraphy; Carbonate compensation depth; Carbonates; Cenozoic; Eocene; Foraminifera; Invertebrata; Leg 198; Marine sediments; Microfossils; Nannofossils; North Pacific; Northwest Pacific; ODP Site 1209; ODP Site 1211; Ocean Drilling Program; Pacific Ocean; Paleo-oceanography; Paleocene; Paleoenvironment; Paleogene; Plantae; Protista; Sediments; Shatsky Rise; Solution; Tertiary; West Pacific
Coordinates: N313400 N374800 E1624600 E1571500
N320000 N320000 E1575100 E1575100
Record ID: 2006077747
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