globalchange  > 气候减缓与适应
DOI: 10.1016/j.quascirev.2018.07.022
Scopus记录号: 2-s2.0-85051010012
论文题名:
The effects of mid-Holocene fluvio-eolian interplay and coastal dynamics on the formation of dune-dammed lakes in NE Brazil
作者: Zular A.; Utida G.; Cruz F.W.; Sawakuchi A.O.; Wang H.; Bícego M.; Giannini P.C.F.; Rodrigues S.I.; Garcia G.P.B.; Vuille M.; Sifeddine A.; Zocatelli R.; Turcq B.; Mendes V.R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 196
起始页码: 137
结束页码: 153
语种: 英语
英文关键词: Boqueirão lake ; Coastal eolian deposits ; Dune-dammed lakes ; Fluvio-eolian interplay ; Paleoclimate
Scopus关键词: Climate change ; Drainage ; Geochemistry ; Lakes ; Sea level ; Depositional condition ; Eolian deposits ; Fluvio-eolian interplay ; Microfossil assemblages ; Organic geochemistry ; Paleoclimates ; Sediment availability ; Sedimentological analysis ; Sediments ; abundance ; aridity ; biochronology ; coastal evolution ; dune ; dune field ; eolian process ; fossil assemblage ; Holocene ; lacustrine deposit ; microfossil ; mortality ; paleoclimate ; Quaternary ; rainfall ; sea level change ; sediment core ; sedimentology ; sponge ; Brazil ; Bacillariophyta
英文摘要: We analyzed the Late Quaternary coastal evolution of the easternmost tip of South America in Brazil in light of fluvial-eolian interactions controlled by relative sea-level, climate, and coastal physiography changes. The chronology obtained by OSL-SAR of 36 samples coupled with sedimentological analysis from stabilized dunes suggest that eolian activity was primarily controlled by episodes of sediment availability because prevailing SE trade winds have been steadily strong throughout the Holocene. Contrary to the most conventional view linking dune activity to aridity, dune buildup occurred in a period of increased humidity in NE Brazil between 11 ka and 6 ka when a rising relative sea level and higher rainfall enhanced sediment delivery benefiting the construction of transgressive dunefields. The interplay of these advancing dunes with the existing drainage pathways is here investigated using a modern regional analog and through the evolution of Boqueirão Lake formed by dune blockage. Analysis of a sediment core from this lake dated between 8.4 and 0.9 ka indicated changes over time in microfossil assemblages, organic geochemistry, and grain size data conforming to fluvial or lacustrine depositional conditions. Between 7.2 and 4.4 ka, during the predominantly regional humid climate, the high abundance of fluvial sponge species correlated with a framework of competent-flow drainage systems diverting from advancing dunes. An abrupt transition from a wetter to a drier climate at 4.4–4.0 ka stimulated episodes of fluvial damming as indicated by sharp changes from sandy to muddy sediments and anomalous concentration of sponge spicules concurrent with significant mortality rates of fluvial adapted species. From 3.9 ka to the present, the disappearance of sponge spicules and peaking diatom concentration attested to a predominant lacustrine environment. Thus, the formation of Boqueirão Lake is mainly a result of the regionally drier climate and not a consequence of increased humidity in coastal NE Brazil. © 2018 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112084
Appears in Collections:气候减缓与适应

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作者单位: Instituto de Geociências, Universidade de São Paulo, Rua do Lago 562São Paulo 05508-080, Brazil; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xian, Shaanxi 710061, China; Interdisciplinary Research Center of Earth Science Frontier, Beijing Normal University, Beijing, 100875, China; Illinois State Geological Survey, Prairie Research Institute, University of Illinois at Urbana-Champaign, Champaign, IL 61820, United States; Laboratório de Química Orgânica Marinha, Instituto Oceanográfico, Departamento de Oceanografia Física, Universidade de São PauloSão Paulo, Brazil; Pró-Reitoria, Universidade de São PauloSão Paulo, Brazil; Department of Atmospheric and Environmental Sciences, University at Albany, SUNY, 1400 Washington Ave., Albany, NY 12222, United States; LMI PALEOTRACES (IRD UFF SORBONNE UNIVERSITÉ UPCH UANTOF), Departamento de Geoquimica, Niteroi, Brazil; IRD-Sorbone Universités (UMR LOCEAN, Centre IRD France Nord), Bondy, France; Université d'Orléans, Institut des Sciences de la Terre d'Orléans (ISTO), UMR 7327, CNRS/INSU, Orléans, 45075, France

Recommended Citation:
Zular A.,Utida G.,Cruz F.W.,et al. The effects of mid-Holocene fluvio-eolian interplay and coastal dynamics on the formation of dune-dammed lakes in NE Brazil[J]. Quaternary Science Reviews,2018-01-01,196
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