An early late Paleocene event on Shatsky Rise, Northwest Pacific Ocean (ODP Leg 198); evidence from planktonic foraminiferal assemblages

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doi: 10.2973/odp.proc.sr.198.102.2005
Author(s): Petrizzo, Maria Rose
Ocean Drilling Program, Leg 198, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
Universita di Milano, Dipartimento di Scienze della Terra, Milan, Italy
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, 29p. 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; includes appendix. 11 refs.CD-ROM, ISSN 1096-2514; WWW, ISSN 1096-7451; illus., incl. 4 plates, 5 tables, sketch map
Summary: A pulse of intense carbonate dissolution occurred during the early late Paleocene at 58.4 Ma. A prominent 5- to 25-cm-thick dark brown clay-rich calcareous nannofossil ooze was found on Shatsky Rise at Sites 1209, 1210, 1211, and 1212 during Ocean Drilling Program Leg 198. The layer corresponds to the lower part of planktonic foraminiferal Zone P4 and coincides with the evolutionary first occurrence of the nannolith Heliolithus kleinpellii, an important component of late Paleocene assemblages and a marker for the base of Zone CP5. The clay-rich layer contains common crystals of phillipsite, fish teeth, and phosphatic micronodules and corresponds to a prominent peak in magnetic susceptibility that probably reflects these high amounts of detrital and authigenic materials. Detailed quantitative analysis of planktonic foraminiferal assemblages across the clay-rich nannofossil ooze layer shows that fundamental changes in faunal composition occurred before, during, and after deposition of the clay-rich ooze. Planktonic foraminifers in the clay-rich layer are characterized by a low-diversity, largely dissolved assemblage dominated by representatives of the genus Igorina (mainly Igorina tadjikistanensis and Igorina pusilla). Conversely, Igorina albeari, morozovellids, acarininids, globanomalinids, subbotinids, and chiloguembelinids are common below the clay-rich layer, almost disappear within it, and reappear in low abundances above the clay-rich layer. These changes in faunal compositions are likely a response to a change in carbonate saturation that caused increased dissolution on the seafloor owing to the shoaling of the lysocline and the carbonate compensation depth.
Year of Publication: 2006
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Assemblages; Biostratigraphy; Biozones; Carbonate compensation depth; Cenozoic; Foraminifera; Invertebrata; Leg 198; Microfossils; North Pacific; Northwest Pacific; Ocean Drilling Program; Pacific Ocean; Paleo-oceanography; Paleocene; Paleoenvironment; Paleogene; Protista; Reconstruction; Shatsky Rise; Tertiary; Upper Paleocene; West Pacific
Coordinates: N313400 N374800 E1624600 E1571500
Record ID: 2006077746
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