http://www.cnr.it/ontology/cnr/individuo/prodotto/ID285454

Enhanced primary productivity and magnetotactic bacterial production in response to middle Eocene warming in the Neo-Tethys Ocean. (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Enhanced primary productivity and magnetotactic bacterial production in response to middle Eocene warming in the Neo-Tethys Ocean. (Articolo in rivista) (literal)

Anno

2014-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/j.palaeo.2014.08.009 (literal)

Alternative label

Savian J.F.[1], Jovane L.[2], Frontalini F.[3], Trindade R.I.F.[4], Coccioni R.[3], Bohaty S.M.[5], Wilson P.A.[5], Florindo F.[6], Roberts A.P.[7], Catanzariti R.[8], Iacoviello F. [2] (2014)
Enhanced primary productivity and magnetotactic bacterial production in response to middle Eocene warming in the Neo-Tethys Ocean.
in Palaeogeography, palaeoclimatology, palaeoecology; Elsevier, Amsterdam (Paesi Bassi)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Savian J.F.[1], Jovane L.[2], Frontalini F.[3], Trindade R.I.F.[4], Coccioni R.[3], Bohaty S.M.[5], Wilson P.A.[5], Florindo F.[6], Roberts A.P.[7], Catanzariti R.[8], Iacoviello F. [2] (literal)

Pagina inizio

32 (literal)

Pagina fine

45 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://www.journals.elsevier.com/palaeogeography-palaeoclimatology-palaeoecology/ (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

414 (literal)

Rivista

Palaeogeography, palaeoclimatology, palaeoecology (Rivista)

Note

Scopu (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

[1] Departamento de Geologia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil [2]Departamento de Oceanografia Física, Instituto Oceanográfico, Universidade de São Paulo, São Paulo, Brazil [3]Dipartimento di Scienze della Terra, della Vita e dell'Ambiente, Università degli Studi di Urbino \"Carlo Bo\", Urbino, Italy [4] Departamento de Geofísica, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, São Paulo, Brazil [5] Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, UK [6] Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy [7] Research School of Earth Sciences, The Australian National University, Canberra ACT 0200, Australia [8] Istituto di Geoscienze e Georisorse CNR, 56124 Pisa, Italy (literal)

Titolo

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

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 ?18O 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. (literal)

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