Please use this identifier to cite or link to this item:
Authors: Savian, J.* 
Jovane, L.* 
Frontalini, F.* 
Trindade, R. I. F* 
Coccioni, R.* 
Bohaty, S. M.* 
Wilson, P. A.* 
Florindo, F.* 
Roberts, A. P.* 
Catanzariti, R.* 
Iacoviello, F.* 
Title: Enhanced primary productivity and magnetotactic bacterial production in response to middle Eocene warming in the Neo-Tethys Ocean
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology 
Series/Report no.: /414 (2014)
Publisher: Elsevier Science Limited
Issue Date: 23-Aug-2014
DOI: 10.1016/j.palaeo.2014.08.009
Keywords: Paleoproductivity
Monte Cagnero
Subject Classification03. Hydrosphere::03.01. General::03.01.06. Paleoceanography and paleoclimatology 
04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism 
04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism 
04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetism 
Abstract: Earth's climate experienced a warming event known as the Middle Eocene Climatic Optimum (MECO) at ~ 40 Ma, which was an abrupt reversal of a long-term Eocene cooling trend. This event is characterized in the deep Southern, Atlantic, Pacific and Indian Oceans by a distinct negative δ18O excursion over 500 kyr. We report results of high-resolution paleontological, geochemical, and rock magnetic investigations of the Neo-Tethyan Monte Cagnero (MCA) section (northeastern Apennines, Italy), which can be correlated on the basis of magneto- and biostratigraphic results to the MECO event recorded in deep-sea sections. In the MCA section, an interval with a relative increase in eutrophic nannofossil taxa (and decreased abundances of oligotrophic taxa) spans the culmination of the MECO warming and its aftermath and coincides with a positive carbon isotope excursion, and a peak in magnetite and hematite/goethite concentration. The magnetite peak reflects the appearance of putative magnetofossils, while the hematite/goethite apex is attributed to an enhanced detrital mineral contribution, likely as aeolian dust transported from the continent adjacent to the Neo-Tethys Ocean during a drier, more seasonal climate during the peak MECO warming. Based on our new geochemical, paleontological and magnetic records, the MECO warming peak and its immediate aftermath are interpreted as a period of high primary productivity. Sea-surface iron fertilization is inferred to have stimulated high phytoplankton productivity, increasing organic carbon export to the seafloor and promoting enhanced biomineralization of magnetotactic bacteria, which are preserved as putative magnetofossils during the warmest periods of the MECO event in the MCA section. Together with previous studies, our work reinforces the connection between hyperthermal climatic events and the occurrence (or increased abundance) of putative magnetofossils in the sedimentary record.
Appears in Collections:Article published / in press

Files in This Item:
File Description SizeFormat Existing users please Login
Savian et al. 2014.pdf2.07 MBAdobe PDF
Show full item record


checked on Feb 10, 2021

Page view(s) 10

checked on May 16, 2022

Download(s) 50

checked on May 16, 2022

Google ScholarTM