globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.06.029
论文题名:
Environmental magnetic implications of magnetofossil occurrence during the Middle Eocene Climatic Optimum (MECO) in pelagic sediments from the equatorial Indian Ocean
作者: Savian J.F.; Jovane L.; Giorgioni M.; Iacoviello F.; Rodelli D.; Roberts A.P.; Chang L.; Florindo F.; Sprovieri M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 441
起始页码: 212
结束页码: 222
语种: 英语
英文关键词: Environmental magnetism ; Indian Ocean ; Magnetofossils ; MECO event
英文摘要: Magnetic properties of pelagic marine sediments that record the Middle Eocene Climatic Optimum (MECO) at ~. 40. Ma provide information about major environmental changes. The main variations observed during this transient warming event reflect a bacterial magnetofossil signal, but the cause of the linkage between bacterial production and climate remains unclear. We present an environmental magnetic study of middle Eocene deep-sea sediments from the northern edge of Madingley Rise (Ocean Drilling Program Hole 711A, equatorial Indian Ocean) to investigate the origin of the increased magnetic mineral concentration concomitant with subchron C18n.2n, which corresponds to the MECO interval in ODP Hole 711A. This magnetic mineral peak also coincides with a change in lithofacies from calcareous nannofossils to radiolarian ooze, and a slight increase in clay concentration. Magnetite is the main magnetic mineral in the MECO sediments, which occurs as magnetically non-interacting single domain biogenic particles. The increased magnetic mineral concentration across the MECO event is likely to have been caused by increased eolian iron fertilization. This is interpreted to have given rise to increased surface ocean productivity, where increased delivery of iron and nutrients to the seafloor enhanced magnetotactic bacterial populations during the MECO event. © 2015 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/68706
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 Geociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, Brazil; Departamento de Oceanografia Física, Instituto Oceanográfico, Universidade de São Paulo, Praça do Oceanográfico, 191, São Paulo, Brazil; Research School of Earth Sciences, The Australian National University, Canberra, ACT, Australia; Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, Rome, Italy; Consiglio Nazionale delle Ricerche, Istituto per l'Ambiente Marino Costiero U.O. Capo Granitola, Via del Mare 3, 91021 Torretta Granitola, Camp. di Mazara, Trapani, Italy

Recommended Citation:
Savian J.F.,Jovane L.,Giorgioni M.,et al. Environmental magnetic implications of magnetofossil occurrence during the Middle Eocene Climatic Optimum (MECO) in pelagic sediments from the equatorial Indian Ocean[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,441
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