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Enhanced primary productivity and magnetotactic bacterial production in response to middle Eocene warming in the Neo-Tethys Ocean

Savian, Jairo; Jovane, Luigi; Frontalini, Fabrizio; Trindade, Ricardo; Coccioni, Rodolfo; Bohaty, Steven; Wilson, Paul A.; Florindo, Fabio; Roberts, Andrew; Catanzariti, Rita; Iacoviello, Francesco

Description

Earth's climate experienced a warming event known as the Middle Eocene Climatic Optimum (MECO) at ~40Ma, 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 500kyr. 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...[Show more]

dc.contributor.authorSavian, Jairo
dc.contributor.authorJovane, Luigi
dc.contributor.authorFrontalini, Fabrizio
dc.contributor.authorTrindade, Ricardo
dc.contributor.authorCoccioni, Rodolfo
dc.contributor.authorBohaty, Steven
dc.contributor.authorWilson, Paul A.
dc.contributor.authorFlorindo, Fabio
dc.contributor.authorRoberts, Andrew
dc.contributor.authorCatanzariti, Rita
dc.contributor.authorIacoviello, Francesco
dc.date.accessioned2015-12-13T22:31:19Z
dc.identifier.issn0031-0182
dc.identifier.urihttp://hdl.handle.net/1885/75197
dc.description.abstractEarth's climate experienced a warming event known as the Middle Eocene Climatic Optimum (MECO) at ~40Ma, 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 500kyr. 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.
dc.publisherElsevier
dc.sourcePalaeogeography, Palaeoclimatology, Palaeoecology
dc.titleEnhanced primary productivity and magnetotactic bacterial production in response to middle Eocene warming in the Neo-Tethys Ocean
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume414
dc.date.issued2014
local.identifier.absfor040300 - GEOLOGY
local.identifier.ariespublicationU3488905xPUB4510
local.type.statusPublished Version
local.contributor.affiliationSavian, Jairo, Universidade Federal do Rio Grande do Sul
local.contributor.affiliationJovane, Luigi, Universidade de Sao Paulo
local.contributor.affiliationFrontalini, Fabrizio, Universita degli Studi di Urbino "Carlo Bo"
local.contributor.affiliationTrindade, Ricardo, Universidade de Sao Paulo
local.contributor.affiliationCoccioni, Rodolfo, Universita degli Studi di Urbino
local.contributor.affiliationBohaty, Steven, University of Southampton
local.contributor.affiliationWilson, Paul A., Southampton Oceanography Centre
local.contributor.affiliationFlorindo, Fabio, Instituto Nazionale di Geofisica e Vulcanologia
local.contributor.affiliationRoberts, Andrew, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationCatanzariti, Rita, Instituto di Geoscienze e Georissorse CNR
local.contributor.affiliationIacoviello, Francesco, Universidade de Sao Paulo
local.description.embargo2037-12-31
local.bibliographicCitation.startpage32
local.bibliographicCitation.lastpage45
local.identifier.doi10.1016/j.palaeo.2014.08.009
dc.date.updated2015-12-11T08:59:49Z
local.identifier.scopusID2-s2.0-84906930550
local.identifier.thomsonID000345202500003
CollectionsANU Research Publications

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