Major perturbations in the global carbon cycle and photosymbiont-bearing planktic Foraminifera during the early Eocene

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doi: 10.5194/cp-12-981-2016
Author(s): Luciani, Valeria; Dickens, Gerald R.; Backman, Jan; Fornaciari, Eliana; Giusberti, Luca; Agnini, Claudia; D'Onofrio, Roberta
Author Affiliation(s): Primary:
Polo Scientifico Tecnologico, Ferrara University, Department of Physics and Earth Sciences, Ferrara, Italy
Stockholm University, Sweden
Padova University, Italy
Volume Title: Climate of the Past
Source: Climate of the Past, 12(4), p.981-1007. Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1814-9324
Note: In English. Includes appendices. 188 refs.; illus., incl. strat. cols., geol. sketch maps
Summary: 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 planktic 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 stratigraphic markers, and the δ13C records at each section can be correlated amongst each other and to δ13C 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 of Acarinina, 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 manifold and may include temperature effects on photosymbiont-bearing planktic foraminifera and changes in ocean chemistry.
Year of Publication: 2016
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Acarinina; Alps; Assemblages; Atlantic Ocean; Biologic evolution; Blake Nose; Blake Plateau; C-13/C-12; Carbon; Carbon cycle; Carbonates; Cenozoic; Climate change; Correlation; DSDP Site 577; Deep Sea Drilling Project; Depositional environment; Early Eocene Climatic Optimum; Eocene; Europe; Extinction; Foraminifera; Fragmentation; Geochemical cycle; Global; IPOD; Invertebrata; Isotope ratios; Isotopes; Italy; Leg 171B; Leg 86; Lower Eocene; Magnetostratigraphy; Marine environment; Microfossils; Morozovella; North Atlantic; North Pacific; Northwest Pacific; O-18/O-16; ODP Site 1051; Occurrence; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleogene; Planktonic taxa; Possagno Italy; Prealps; Preservation; Protista; Quantitative analysis; Recrystallization; Sediments; Shatsky Rise; Solution; Southern Europe; Species diversity; Stable isotopes; Stratigraphy; Succession; Tertiary; Tests; Veneto Italy; West Pacific
Coordinates: N455100 N455100 E0115136 E0115136
N322628 N322632 E1574324 E1574323
N300311 N300311 W0762128 W0762128
Record ID: 2017017651
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany