Quantitative Pleistocene calcareous nannofossil biostratigraphy; preliminary results from the IODP Site U1385 (Exp 339), the Shackleton Site

Author(s): Balestra, B.; Flores, J. A.; Acton, G.; Alvarez Zarikian, Carlos; Grunert, Patrick; Hernandez-Molina, F. J.; Hodell, D. A.; Li, B.; Richter, C. F.; Sanchez Goni, M. F.; Sierro, Francisco J.; Singh, A.; Stow, Dorrik A.; Voelker, Antje H.; Xuan, C.
Author Affiliation(s): Primary:
University of California at Santa Cruz, IMS, Santa Cruz, CA, United States
University of Salamanca, Spain
Sam Houston State University, United States
Texas A&M University, United States
University of Graz, Austria
Royal Holloway University of London, United Kingdom
University of Cambridge, United Kingdom
Nanjing Institute of Geology and Palaeontology, China
University of Louisiana, United States
Université de Bordeaux I, France
Banaras Hindu University, India
Heriot-Watt University, United Kingdom
Portuguese Institute for the Ocean and the Atmosphere, Portugal
University of Southampton, United Kingdom
Volume Title: AGU 2013 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2013; American Geophysical Union 2013 fall meeting, San Francisco, CA, Dec. 9-13, 2013. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: In order to explore the effects of Mediterranean Outflow Water (MOW) on North Atlantic circulation and climate, Integrated Ocean Drilling Program (IODP) Expedition 339 (Mediterranean Outflow) cored a series of sites in the Gulf of Cadiz slope and off West Iberia (North East Atlantic). Site U1385 (37°48'N, 10°10'W, 3146 m water depth) was selected and drilled in the lower slope of the Portuguese margin, at a location close to the so-called Shackleton Site MD95-2042 (in honor of the late Sir Nicholas Shackleton), to provide a marine reference section of Pleistocene millennial-scale climate variability. Three holes were cored at Site U1385 using the Advanced Piston Corer (APC) to a depth of ≈151 meters below seafloor in order to recover a continuous stratigraphic record covering the past 1.4 Ma. Here we present preliminary results of the succession of standard and alternative calcareous nannofossil events. Our quantitative study based on calcareous nannofossils shows well-preserved and abundant assemblages throughout the core. Most conventional Pleistocene events were recognized. Moreover, our quantitative investigations provide further data on the stratigraphic distribution of some species and groups, such as the large Emiliania huxleyi (>4 µm), the small Gephyrocapsa group, and Reticulofenestra cisnerosii. A preliminary calibration of the calcareous nannofossil events with the paleomagnetic and astronomical signal, estimated by comparison with geophysical and logging parameters is also presented. *IODP Expedition 339 Scientists: Bahr, A., Ducassou. E., Flood, R., Furota, S., Jimenez-Espejo, F., Kim, J. K., Krissek, L., Kuroda, J., Llave, E., Lofi, J., Lourens, L., Miller, M., Nanayama, F., Nishida, N., Roque, C., Sloss, C., Takashimizu, Y., Tzanova, A., Williams, T.
Year of Publication: 2013
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Algae; Atlantic Ocean; Biostratigraphy; Calcareous composition; Cenozoic; Cores; Expedition 339; Gulf of Cadiz; IODP Site U1385; Integrated Ocean Drilling Program; Marine sediments; Microfossils; Nannofossils; North Atlantic; Paleoclimatology; Paleoecology; Plantae; Pleistocene; Quantitative analysis; Quaternary; Sediments
Coordinates: N373417 N373417 W0100719 W0100720
Record ID: 2014062145
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