Emergence of the Isthmus of Panama links to Northern Hemisphere glaciation; relation to new definition of the "Quaternary"

Author(s): Sato, Tokiyuki
Author Affiliation(s): Primary:
Akita University, Institute of Applied Earth Sciences, Akita, Japan
Nihon University, Japan
Volume Title: 2009 symposium on Environmental change and tectonics around the base of the newly defined Quaternary
Volume Author(s): Ueki, Takeyuki, prefacer; Endo, Kunihiko
Source: Daiyonki-Kenkyu = Quaternary Research, 49(5), p.283-292; 2009 symposium on Environmental change and tectonics around the base of the newly defined Quaternary, Japan, 2009, prefaced by Takeyuki Ueki and Kunihiko Endo. Publisher: Japan Association for Quaternary Research, Tokyo, Japan. ISSN: 0418-2642 CODEN: DAYKAF
Note: In Japanese with English summary. 29 refs.; illus., incl. strat. col., sketch maps
Summary: Calcareous nannofossil assemblages found in samples from the Arctic and North Pacific Oceans indicate that heavy Northern Hemisphere glaciation occurred in 2.75 Ma, based on the abundant occurrence of cold water nanno-fossil Coccolithus pelagicus and the drastic increase of ice rafted debris in these areas. Final closure of the Central American Sea Way, indicated by the biogeography of calcareous nannofossils in the Caribbean and the eastern Pacific, occurred at this time. These results indicate that the emergence of the Isthmus of Panama resulted in the Northern Hemisphere glaciation, and also led to both the Quaternary-style ocean circulation and nannofossil biogeography in 2:75 Ma.
Year of Publication: 2010
Research Program: IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Algae; Arctic Ocean; Assemblages; Atlantic Ocean; Biogeography; Cenozoic; Coccolithophoraceae; Coccolithus; Coccolithus pelagicus; East Pacific; Emperor Seamounts; Expedition 303; Expeditions 303/306; Glaciation; IODP Site U1308; Integrated Ocean Drilling Program; Isthmus of Panama; Leg 145; Leg 151; Lower Pleistocene; Marine environment; Microfossils; Mid-Atlantic Ridge; Neogene; North Atlantic; North Pacific; Northeast Atlantic; Northeast Pacific; Northwest Pacific; ODP Site 881; ODP Site 882; ODP Site 883; ODP Site 887; ODP Site 911; Ocean Drilling Program; Pacific Ocean; Paleoclimatology; Paleoenvironment; Paleogeography; Plantae; Pleistocene; Pliocene; Quantitative analysis; Quaternary; Tertiary; Upper Pliocene; West Pacific; Yermak Plateau
Coordinates: N802829 N802829 E0081338 E0081338
N542155 N542155 W1482647 W1482647
N495300 N495300 W0241400 W0241400
N470606 N502148 E1673600 E1612930
Record ID: 2011027988
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