globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.01.006
论文题名:
Mineral and elemental indicators of post-glacial changes in sediment delivery and deposition under a western boundary upwelling system (Cabo Frio, southeastern Brazil)
作者: Albuquerque A.L.; Meyers P.; Belem A.L.; Turcq B.; Siffedine A.; Mendoza U.; Capilla R.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 445
起始页码: 72
结束页码: 82
语种: 英语
英文关键词: Clay minerals ; Mass accumulation rates ; Postglacial sea level changes ; Southeastern Brazilian continental shelf ; Trace elements
英文摘要: Minerals and elements are important proxies that can provide information about variations in the delivery and deposition of coastal ocean sediments associated with past climate changes. In this study, postglacial changes in the accumulation of sediments on the upper shelf of southeastern Brazil are linked to the evolution of regional paleoceanographic and continental paleoclimatic conditions during the last 14.4kyr CAL BP. Mineralogical and major and trace element analyses of a 14C-dated sediment core identify three main lithostratigraphic units of this core that reveal a succession of changes in sediment delivery and accumulation as postglacial sea level rose and Holocene climate on land evolved. The depositional setting has transitioned in response to the large sea level rise prior to 9.9kyr CAL BP from being a shallow water high energy environment to a deeper water one. This location has since then been a lower energy environment that has persisted into modern times. Due to the high marine productivity associated with the Cabo Frio upwelling system in an oxygenated water column, the sediments have shown a complex and dynamic redox condition, making variations in redox-sensitive trace elements indicative of changes in primary production and organic matter diagenesis at this location. After sea level stabilized ~9kyr CAL BP, variations in fluxes of Al, Fe, Ca, and minerals were small, indicating that climate driven changes had only secondary controls on delivery of detrital sediment components to the Cabo Frio shelf. Modern coastal upwelling conditions and the onset of mid-shelf organic-rich sediment deposition were established after 9.9CAL kyr BP. © 2016 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/68568
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作者单位: Departamento de Geoquímica, Universidade Federal Fluminense, Niterói, RJ, Brazil; Department of Earth and Environmental Sciences, The University of Michigan, Ann Arbor, MI, United States; Institut de Recherche pour le Développement, France (IRD), LOCEAN, UMR 7159 CNRS-IRD-Univ P. et M. Curie-MNHN, 32, Avenue Henri Varagnat, Bondy cedex, France; Departamento de Engenharia Agricola e Ambiental, Universidade Federal Fluminense, Niterói, Brazil; LMI PALEOTRACES (Institut de Recherche pour le Développement-France, Universidade Federal Fluminense-Brazil, Universidad de Antofagasta-Chile) Departamento de Geoquímica, Niterói, Brazil; Petrobras-Cenpes, Cidade Universitária, Ilha do Fundão, RJ, Brazil

Recommended Citation:
Albuquerque A.L.,Meyers P.,Belem A.L.,et al. Mineral and elemental indicators of post-glacial changes in sediment delivery and deposition under a western boundary upwelling system (Cabo Frio, southeastern Brazil)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,445
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