globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.06.015
Scopus记录号: 2-s2.0-85021429779
论文题名:
Age of depositional and weathering events in Central Amazonia
作者: Sant'Anna L.G.; Soares E.A.D.A.; Riccomini C.; Tatumi S.H.; Yee M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 170
起始页码: 82
结束页码: 97
语种: 英语
英文关键词: Alluvial plain ; Amazonia ; Iron oxide ; LGM ; OSL dating ; Pleistocene
Scopus关键词: C (programming language) ; Climate change ; Deposits ; Iron oxides ; Luminescence ; Mass spectrometry ; Rivers ; Sea level ; Weathering ; Alluvial plains ; Amazonia ; Holocene climate change ; Lacustrine deposits ; Optically stimulated luminescence ; OSL dating ; Pleistocene ; Sedimentary deposits ; Deposition
英文摘要: In the last three decades, several studies have been devoted to understanding the role of Late Pleistocene–Holocene climate changes in the Amazonia lowlands environment. However, most of these studies used data obtained from sedimentary deposits (lakes, swamps, and colluvium) located away from the central plain or on the edges of the Amazonia region. This article integrates optically stimulated luminescence and accelerated mass spectrometry 14C ages with sedimentological and geomorphological data obtained during this study or compiled from the literature for fluvial and lacustrine deposits of the central alluvial plain of the Solimões-Amazon River. The age data allow us to present a chronological framework for the Late Pleistocene–Holocene deposits and conclude that (i) the dryness of the LGM in central Amazonia lowlands is recorded by the formation of fluvial terraces and their weathering to pedogenic hematite between 25.3 ka and 17.7 ka; (ii) floodplain deposition was contemporaneous with terrace weathering and occurred in a context of decreased water volume in fluvial channels, lowering of river base level and sea level, and isostatic rebound of the continent; and (iii) lateral and mid-channel fluvial bars in the Solimões-Amazon River have a minimum age of 11.5 ± 1.5 ka, and their deposition responded to increased precipitation at the beginning of the Holocene. © 2017 Elsevier Ltd
资助项目: This research was supported by the FAPESP—Fundação de Amparo à Pesquisa do Estado de São Paulo, and the first author is thankful for the Grants 2007/58319-1 and Undergraduate fellowships 2009/53198-7 and 2010/01807-7. CR is a research fellow of CNPq, Brazil, Grant #307871/2010-0. We thank the journal editor, Dr. Neil Roberts, and an anonymous reviewer who provided critical review.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59152
Appears in Collections:过去全球变化的重建

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作者单位: School of Arts, Sciences and Humanities, University of São Paulo, Av. Arlindo Bettio 1000, São Paulo, SP CEP, Brazil; Institute of Energy and Environment, University of São Paulo, Av. Prof. Luciano Gualberto 1289, São Paulo, SP CEP, Brazil; Institute of Exact Sciences, Department of Geosciences, Federal University of Amazonas, Av. Gen. Rodrigo Octávio Jordão Ramos, 6200, Manaus, AM CEP, Brazil; Institute of Geosciences, University of São Paulo, Rua do Lago 562, São Paulo, SP CEP, Brazil; Federal University of São Paulo, Campus Baixada Santista, Avenida Saldanha da Gama 89, Ponta da Praia, São Paulo, SP CEP, Brazil

Recommended Citation:
Sant'Anna L.G.,Soares E.A.D.A.,Riccomini C.,et al. Age of depositional and weathering events in Central Amazonia[J]. Quaternary Science Reviews,2017-01-01,170
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