globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.08.009
论文题名:
Enhanced primary productivity and magnetotactic bacterial production in response to middle Eocene warming in the Neo-Tethys Ocean
作者: Savian J.F.; 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.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 414
起始页码: 32
结束页码: 45
语种: 英语
英文关键词: Italy ; MECO ; Monte Cagnero ; Paleoproductivity ; Putative magnetofossils
英文摘要: 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 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. © 2014 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69183
Appears in Collections:过去全球变化的重建

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作者单位: Departamento de Geologia, Instituto de Geocieˆncias, Universidade Federal do Rio Grande do Sul, Av. Bento Gonc¸alves, 9500, Porto Alegre, Brazil; Departamento de Oceanografia Fi´sica, Instituto Oceanogra´fico, Universidade de Sa&tild;o Paulo, Prac¸a do Oceanogra´fico, 191, Sa&tild;o Paulo, Brazil; Dipartimento di Scienze della Terra, Della Vita e dell'Ambiente, Universita` degli Studi di Urbino Carlo Bo, Campus Scientifico, Localita` Crocicchia, Urbino, Italy; Departamento de Geofi´sica, Instituto de Astronomia, Geofi´sica e Cieˆncias Atmosfe´ricas, Universidade de Sa&tild;o Paulo, Rua do Mata&tild;o, 1226, Sa&tild;o Paulo, Brazil; Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton, United Kingdom; Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, Rome, Italy; Research School of Earth Sciences, The Australian National University, Canberra, ACT, Australia; Istituto di Geoscienze e Georisorse CNR, Pisa, Italy

Recommended Citation:
Savian J.F.,Jovane L.,Frontalini F.,et al. Enhanced primary productivity and magnetotactic bacterial production in response to middle Eocene warming in the Neo-Tethys Ocean[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,414
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