globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.06.019
论文题名:
Provenance of quaternary and modern alluvial deposits of the Amazonian floodplain (Brazil) inferred from major and trace elements and Pb-Nd-Sr isotopes
作者: Horbe A.M.C.; da Trindade I.R.; Dantas E.L.; Santos R.V.; Roddaz M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 411
起始页码: 144
结束页码: 154
语种: 英语
英文关键词: Active channel deposits ; Amazonas River ; Major and trace elements ; Quaternary terrace deposits
英文摘要: Chemical and Pb, Nd and Sr isotope data from floodplain sedimentary deposits in the Solimo&tild;es River, northwest Brazil, constrain the variability of the deposits through the Quaternary and help reconstruct the paleogeography of Amazonia since the uplift of the Andes. Compared to the modern alluvial deposits in the active channel, the Quaternary terrace deposits in the Solimo&tild;es River have a higher chemical index of alteration (CIA), higher SiO2/Al2O3 ratios, higher concentrations of immobile elements, higher radiogenic Sr isotopic compositions, more negative εNd(t=0) values, and older Nd TDM ages. These geochemical characteristics indicate that the Quaternary sediment sources were composed by more felsic and/or recycled old continental crust derived rock materials than the younger source areas, which contributed major arc volcanic materials to the flood plain deposits. This shift in the composition of the sediment source areas indicates that a significant reorganization of the architecture of the Solimo&tild;es River has occurred since the uplift of the Andes. © 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/69244
Appears in Collections:过去全球变化的重建

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作者单位: Instituto de Geocieˆncias, Universidade de Brasi´lia, Campus Universita´rio Darcy Ribeiro, Brasi´lia, Brazil; Departamento de Geocieˆncias, Universidade Federal do Amazonas, Av. Gal. Rodrigo O. J. Ramos 3000, Coroado, Manaus, Brazil; GET-Universite´ de Toulouse, 14 avenue Edouard Belin, Toulouse, France

Recommended Citation:
Horbe A.M.C.,da Trindade I.R.,Dantas E.L.,et al. Provenance of quaternary and modern alluvial deposits of the Amazonian floodplain (Brazil) inferred from major and trace elements and Pb-Nd-Sr isotopes[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,411
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