Change search
ReferencesLink to record
Permanent link

Direct link
Major perturbations in the global carbon cycle and photosymbiont-bearing planktic foraminifera during the early Eocene
Stockholm University, Faculty of Science, Department of Geological Sciences. Rice University, USA.
Stockholm University, Faculty of Science, Department of Geological Sciences.
Show others and affiliations
Number of Authors: 7
2016 (English)In: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 12, no 4, 981-1007 p.Article in journal (Refereed) Published
Abstract [en]

A marked switch in the abundance of the planktic foraminiferal genera Morozovella and Acarinina occurred at low-latitude sites near the start of the Early Eocene Climatic Optimum (EECO), a multi-million-year interval when Earth surface temperatures reached their Cenozoic maximum. Stable carbon and oxygen isotope data of bulk sediment are presented from across the EECO at two locations: Possagno in northeast Italy and Deep Sea Drilling Project (DSDP) Site 577 in the northwest Pacific. Relative abundances of plank tic foraminifera are presented from these two locations, as well as from Ocean Drilling Program (ODP) Site 1051 in the northwest Atlantic. All three sections have good strati graphic markers, and the delta C-13 records at each section can be correlated amongst each other and to delta C-13 records at other locations across the globe. These records show that a series of negative carbon isotope excursions (CIEs) occurred before, during and across the EECO, which is defined here as the interval between the J event and the base of Discoaster sublodoensis. Significant though ephemeral modifications in planktic foraminiferal assemblages coincide with some of the short-term CIEs, which were marked by increases in the relative abundance ofAcarinina, similar to what happened across established hyperthermal events in Tethyan settings prior to the EECO. Most crucially, a temporal link exists between the onset of the EECO, carbon cycle changes during this time and the decline in Morozovella. Possible causes are mani- fold and may include temperature effects on photosymbiont-bearing planktic foraminifera and changes in ocean chemistry.

Place, publisher, year, edition, pages
2016. Vol. 12, no 4, 981-1007 p.
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-131576DOI: 10.5194/cp-12-981-2016ISI: 000376073100011OAI: diva2:943008
Available from: 2016-06-27 Created: 2016-06-21 Last updated: 2016-06-27Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Backman, Jan
By organisation
Department of Geological Sciences
In the same journal
Climate of the Past
Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 2 hits
ReferencesLink to record
Permanent link

Direct link