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Improved dating of the Pliocene of the eastern South Atlantic using graphic correlation: implications for paleobiogeography and paleoceanography

Micropaleontology

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Abstract

Graphic correlation of foraminifer and nannofossil events establishes a high resolution chronology for the Pliocene at Deep Sea Drilling Project Site 532. Coarsely sampled magnetic inclination data are reinterpreted to indicate a complete Pliocene section. The age model suggests mean accumulation rates of 9.5 cm 10-3 yr for the first half of the early Pliocene and 5.8 cm 10-3 yr throughout the later part of the early Pliocene - early Pleistocene. Major upwelling began at the location of Site 532 at 3.2 Ma. Time series analysis indicated a 41 ky cyclicity to the CaCO3 record between 2 and 4.5 Ma. Data support ages of 1.9 Ma for the first appearance of Globorotalia truncatulinoides and approximately isochronous southern hemisphere first appearances for Globorotalia crassaformis (4.70 Ma), Globorotalia puncticulata (4.77 Ma), and Globorotalia inflata (3.68 Ma). -Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Improved dating of the Pliocene of the eastern South Atlantic using graphic correlation: implications for paleobiogeography and paleoceanography
Series title:
Micropaleontology
Volume
35
Issue:
3
Year Published:
1989
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Micropaleontology
First page:
279
Last page:
292
Number of Pages:
14