Pujos, Annick (1987): Mise en place de la circulation au Pacifique central equatorial et des assemblages des nannofossiles calcaires au Neogene (Leg DSDP 85); II, Influence de l'emersion de l'isthme de Panama, entre 7 et 2 Ma Establishment of Equatorial Pacific water circulation and of calcareous nannofossil assemblages during the Neogene (DSDP Leg 85); II, The uplift of the Isthmus of Panama and its consequences between 7 and 2 Ma

Leg/Site/Hole:
DSDP 85
Identifier:
2012-069644
georefid
Creator:
Pujos, Annick
Universite de Bordeaux I, Departement Geologie Oceanographie, Talence, France
author
Identification:
Mise en place de la circulation au Pacifique central equatorial et des assemblages des nannofossiles calcaires au Neogene (Leg DSDP 85); II, Influence de l'emersion de l'isthme de Panama, entre 7 et 2 Ma Establishment of Equatorial Pacific water circulation and of calcareous nannofossil assemblages during the Neogene (DSDP Leg 85); II, The uplift of the Isthmus of Panama and its consequences between 7 and 2 Ma
1987
Bulletin de la Societe Geologique de France
Societe Geologique de France, Paris, France
3
4
731-736
Four sites were drilled during DSDP Leg 85 in the equatorial Pacific. Calcareous nannofossils from Mio-Pliocene sediments recovered from the central and eastern parts of the high-productivity area were studied in detail. Two main geologic events occurred during the Neogene which modified the water masses circulation in the Pacific Ocean: (1) between 15 and 7 Ma, Antarctic glaciation influenced greatly the Pacific circulation (first part of the study); (2) between 7 and 2 Ma, the progressive uplift of the isthmus of Panama gave rise to a tropical and an equatorial upwelling, which changed the distribution of discoasters and Coccolithus pelagicus, and triggered off the recent Pacific circulation.
French
Serial
Coverage:Geographic coordinates:
North:5.5100
West:-133.2010East: -113.5030
South:0.2954
Stratigraphy; algae; assemblages; biostratigraphy; calcareous composition; Cenozoic; Central America; Deep Sea Drilling Project; East Pacific; Equatorial Pacific; IPOD; Leg 85; microfossils; nannofossils; Neogene; North Pacific; Northeast Pacific; ocean circulation; Pacific Ocean; paleoenvironment; Panama; Plantae; reconstruction; Tertiary; uplifts;
.