The impact of the latest Danian event on planktic foraminiferal faunas at ODP Site 1210 (Shatsky Rise, Pacific Ocean)

Online Access: Get full text
doi: 10.1371/journal.pone.0141644
Author(s): Jehle, Sofie; Bornemann, André; Deprez, Arne; Speijer, Robert P.
Author Affiliation(s): Primary:
Universität Leipzig, Institut für Geophysik und Geologie, Leipzig, Germany
Other:
Katholieke Universiteit Leuven, Belgium
Volume Title: PLoS One
Source: PLoS One, 2015(e0141644). Publisher: Public Library of Science, San Francisco, CA, United States. ISSN: 1932-6203
Note: In English. 85 refs.; illus., incl. 1 table, sketch map
Summary: The marine ecosystem has been severely disturbed by several transient paleoenvironmental events (<200 kyr duration) during the early Paleogene, of which the Paleocene-Eocene Thermal Maximum (PETM, ∼56 Ma) was the most prominent. Over the last decade a number of similar events of Paleocene and Eocene age have been discovered. However, relatively little attention has been paid to pre-PETM events, such as the "Latest Danian Event" ("LDE", ∼62.18 Ma), specifically from an open ocean perspective. Here we present new foraminiferal isotope (δ13C, δ18O) and faunal data from Ocean Drilling Program (ODP) Site 1210 at Shatsky Rise (Pacific Ocean) in order to reconstruct the prevailing paleoceanographic conditions. The studied five-meter-thick succession covers ∼900 kyr and includes the 200-kyr-lasting LDE. All groups surface dwelling, subsurface dwelling and benthic foraminifera show a negative δ13C excursion of >0.6 ppm, similar in magnitude to the one previously reported from neighboring Site 1209 for benthic foraminifera. δ18O-inferred warming by 1.6 to 2.8°C (0.4-0.7 ppm δ18O measured on benthic and planktic foraminiferal tests) of the entire water column accompanies the negative δ13C excursion. A well stratified upper ocean directly before and during the LDE is proposed based on the stable isotope gradients between surface and subsurface dwellers. The gradient is less well developed, but still enhanced after the event. Isotope data are supplemented by comprehensive planktic foraminiferal faunal analyses revealing a dominance of Morozovella species together with Parasubbotina species. Subsurface-dwelling Parasubbotina shows high abundances during the LDE tracing changes in the strength of the isotope gradients and, thus, may indicate optimal living conditions within a well stratified surface ocean for this taxon. In addition, distinct faunal changes are reported like the disappearance of Praemurica species right at the base of the LDE and the continuous replacement of M. praeangulata with M. angulata across the LDE.
Year of Publication: 2015
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Assemblages; Biostratigraphy; C-13/C-12; Carbon; Cenozoic; Danian; Electron microscopy data; Foraminifera; Habitat; Invertebrata; Isotope ratios; Isotopes; Leg 198; Lower Paleocene; Microfossils; Morphology; Multivariate analysis; North Pacific; Northwest Pacific; O-18/O-16; ODP Site 1210; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleo-oceanography; Paleocene; Paleogene; Planktonic taxa; Preservation; Protista; Quantitative analysis; SEM data; Shatsky Rise; Stable isotopes; Statistical analysis; Tertiary; Tests; West Pacific
Coordinates: N321300 N321300 E1581600 E1581600
Record ID: 2016098073
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute.