Late Pliocene climate change in the middle to high latitude region of Northern Hemisphere as seen from calcareous nannofossil assemblages

Author(s): Sato, Tokiyuki
Author Affiliation(s): Primary:
Akita University, Institute of Applied Earth Sciences, Akita, Japan
Volume Title: Kaseki Fossils
Source: Tokyo [Kaseki = Fossils, Vol.82, p.60-66. Publisher: Palaeontological Society of Japan,], Japan. ISSN: 0022-9202
Note: In Japanese with English summary. 36 refs.; illus.
Summary: I reconstruct the late Pliocene to Quaternary paleoceanography of the north Pacific, Arctic, and north Atlantic Ocean based on geographical distribution of cold water nannofossil Coccolithus pelagicus (Wallich) Schiller. Since the species drastically increased at 2.75 Ma in the Arctic Ocean and high latitude regions of western marginal sea of both Pacific and Atlantic Oceans, it decreased at the central to eastern north Atlantic Ocean at 2.9-2.8 Ma just before 2.75 Ma event. This indicates that strengthening of north Atlantic thermohaline circulation just before 2.75 Ma induced an intensified moisture supply to northern high latitude, and resulted in drastically increase of Northern Hemisphere glaciation at 2.75 Ma. Although the abundance of C. pelagicus in the central to eastern north Atlantic Ocean is low until 2.38 Ma, it suddenly increased just after the time. The same characteristics are also found in the middle latitude region of eastern Pacific Ocean at that time. These results indicate that the influence of the late Pliocene glaciation increased in two steps at 2.75 Ma and 2.38 Ma in the Northern Hemisphere.
Year of Publication: 2007
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Arctic Ocean; Atlantic Ocean; Cenozoic; Climate change; Coccolithophoraceae; Coccolithus; Coccolithus pelagicus; DSDP Site 292; DSDP Site 577; DSDP Site 606; DSDP Site 608; DSDP Site 609; DSDP Site 611; Deep Sea Drilling Project; East Pacific; Emperor Seamounts; Gorda Rise; IPOD; Leg 125; Leg 145; Leg 150; Leg 151; Leg 167; Leg 31; Leg 86; Leg 94; Marine environment; Microfossils; Mid-Atlantic Ridge; Neogene; North Atlantic; North Pacific; Northeast Atlantic; Northeast Pacific; Northwest Atlantic; Northwest Pacific; Norwegian Sea; ODP Site 1010; ODP Site 1016; ODP Site 1020; ODP Site 1021; ODP Site 782; ODP Site 881; ODP Site 882; ODP Site 883; ODP Site 887; ODP Site 905; ODP Site 907; ODP Site 910; ODP Site 911; ODP Site 913; Ocean Drilling Program; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleoenvironment; Philippine Sea; Plantae; Pliocene; Quantitative analysis; Quaternary; Shatsky Rise; Tertiary; Thermohaline circulation; Upper Pliocene; West Pacific; Yermak Plateau
Coordinates: N120000 N420000 E1380000 E1240000
N371724 N534600 W0180000 W0351154
N691455 N802830 E0081340 W0124155
Record ID: 2010042761
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