Faunal turnovers in Central Pacific benthic Foraminifera during the Paleocene-Eocene Thermal Maximum

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doi: 10.1016/j.palaeo.2007.02.026
Author(s): Takeda, Kotaro; Kaiho, Kunio
Author Affiliation(s): Primary:
Tohoku University, Institute of Geology and Paleontology, Sendai, Japan
Volume Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, 251(2), p.175-197. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. With appendix. 74 refs.; illus., incl. charts, 3 tables, sketch map
Summary: Although it is well known that the Paleocene/Eocene thermal maximum (PETM) coincided with a major benthic foraminiferal extinction event, the detailed pattern of the faunal turnover has not yet been clarified. Our high-resolution benthic foraminiferal and carbon isotope analyses at the low latitude Pacific Ocean Shatsky Rise have revealed the following record of major faunal transitions: (1) An initial turnover which involved the benthic foraminiferal extinction event (BFE). The BFE, marked by a sharp transition from Pre-extinction fauna to Disaster fauna represented by small-sized Bolivina gracilis, expresses the onset of the PETM and the abrupt extinction of about 30% of taxa. This faunal transition lasted about 45-74 kyr after the initiation of the PETM and was followed by: (2) the appearance of Opportunistic fauna represented by Quadrimorphina profunda, which existed for about 74-91 kyr after the initiation of the PETM. These two faunas, which appeared after the extinction event, are characterized by low diversity and dwarfism, possibly due to lowered oxygen condition and decreased surface productivity. The second pronounced turnover involved the gradual recovery from Opportunistic Fauna to the establishment of Recovery fauna, which coincided with the recovery about 83-91 kyr after its initiation. Abstract Copyright (2007) Elsevier, B.V.
Year of Publication: 2007
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Benthic taxa; Biodiversity; Bolivina; Bolivinitidae; Bulimina; Buliminacea; C-13/C-12; Carbon; Cenozoic; Central Pacific; Cores; Correlation; Dissolved oxygen; Dwarf taxa; Eocene; Extinction; Foraminifera; Invertebrata; Isotope ratios; Isotopes; Leg 198; Lower Eocene; Marine environment; Marine sediments; Microfossils; North Pacific; Northwest Pacific; ODP Site 1209; ODP Site 1210; ODP Site 1211; ODP Site 1212; Ocean Drilling Program; Oxygen; PETM; Pacific Ocean; Paleo-oceanography; Paleocene; Paleocene-Eocene Thermal Maximum; Paleoclimatology; Paleoecology; Paleogene; Paleotemperature; Protista; Recovery; Rotaliina; Sediments; Shatsky Rise; Solutes; Stable isotopes; Tertiary; Upper Paleocene; West Pacific
Coordinates: N323900 N324000 E1583100 E1583000
N321300 N321300 E1581600 E1581600
N320000 N320000 E1575100 E1575100
N322700 N322700 E1574300 E1574300
Record ID: 2007107010
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands