Planktonic foraminiferal assemblages of the Paleocene-Eocene Thermal Maximum of ODP Hole 113-690B

High-resolution study of Antarctic planktonic foraminiferal assemblages (Ocean Drilling Program Site 690, Weddell Sea) shows that these microplankton underwent a stepwise series of changes during the Paleocene–Eocene thermal maximum (PETM). Initiation of this response coincides with the onset of the...

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Bibliographic Details
Main Author: Kelly, Daniel Clay
Format: Dataset
Language:English
Published: PANGAEA 2002
Subjects:
113-690B
Acarinina coalingensis
Acarinina mckannai
Acarinina nitida
Acarinina praepentacamerata
Acarinina soldadoensis
Acarinina spp.
Acarinina subsphaerica
Alabamina wilcoxensis
Chiloguembelina trinitatensis
Counting >180 µm fraction
DEPTH
sediment/rock
DRILL
Drilling/drill rig
Foraminifera
planktic
Globanomalina australiformis
Joides Resolution
Leg113
Morozovella spp.
Ocean Drilling Program
ODP
Parasubbotina varianta
South Atlantic Ocean
Subbotina patagonica
Subbotina spp
Antarctic
Weddell Sea
Weddell
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.842889
https://doi.org/10.1594/PANGAEA.842889
Description
Summary:High-resolution study of Antarctic planktonic foraminiferal assemblages (Ocean Drilling Program Site 690, Weddell Sea) shows that these microplankton underwent a stepwise series of changes during the Paleocene–Eocene thermal maximum (PETM). Initiation of this response coincides with the onset of the carbon isotope excursion (CIE) but precedes the benthic foraminiferal mass extinction. The “top-to-bottom” succession in the biotic response indicates that the surface ocean/atmosphere was affected before the deep sea. The earliest stage of the faunal response entailed a conspicuous turnover within the shallow-dwelling genus Acarinina and a succession of stratigraphic first appearances. The genus Morozovella, large (>180 µm) biserial planktonics, and A. wilcoxensis are all restricted to the lower CIE within this PETM section. Acarininid populations crashed as the ocean/climate system ameliorated during the CIE recovery, reflecting atypical surface water conditions. This transient decline in acarininids is paralleled by a marked increase in carbonate content of sediments. It is postulated that this interval of carbonate enrichment, and its unusual microfauna, reflects enhanced carbon storage within reservoirs of the global carbon cycle other than the marine carbonate system (sensu Broecker et al., 1993, doi:10.1029/93PA00423; Ravizza et al., 2001, doi:10.1029/2000PA000541).

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