globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.04.006
Scopus记录号: 2-s2.0-85045440268
论文题名:
Luminescence of quartz and feldspar fingerprints provenance and correlates with the source area denudation in the Amazon River basin
作者: Sawakuchi A.O.; Jain M.; Mineli T.D.; Nogueira L.; Bertassoli D.J.; Jr.; Häggi C.; Sawakuchi H.O.; Pupim F.N.; Grohmann C.H.; Chiessi C.M.; Zabel M.; Mulitza S.; Mazoca C.E.M.; Cunha D.F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 492
起始页码: 152
结束页码: 162
语种: 英语
英文关键词: Amazon ; denudation ; luminescence ; sediment provenance ; tropical rivers
Scopus关键词: Catchments ; Feldspar ; Quartz ; Rivers ; Sediment transport ; Silt ; Stratigraphy ; Amazon ; denudation ; Optically stimulated luminescence ; Provenance analysis ; Sediment provenance ; Stimulated luminescence ; Stratigraphic records ; Tropical rivers ; Luminescence ; denudation ; erosion rate ; feldspar ; fluvial deposit ; grain size ; luminescence dating ; provenance ; quartz ; source rock ; Amazon Basin ; Amazonas [Brazil] ; Brazil ; Madeira River ; Solimoes River ; Tapajos River ; Xingu River
英文摘要: The Amazon region hosts the world's largest watershed spanning from high elevation Andean terrains to lowland cratonic shield areas in tropical South America. This study explores variations in optically stimulated luminescence (OSL) and infrared stimulated luminescence (IRSL) signals in suspended silt and riverbed sands retrieved from major Amazon rivers. These rivers drain Pre-Cambrian to Cenozoic source rocks in areas with contrasting denudation rates. In contrast to the previous studies, we do not observe an increase in the OSL sensitivity of quartz with transport distance; for example, Tapajós and Xingu Rivers show more sensitive quartz than Solimões and Madeira Rivers, even though the latter have a significantly larger catchment area and longer sediment transport distance. Interestingly, high sensitivity quartz is observed in rivers draining relatively stable Central Brazil and Guiana shield areas (denudation rate ξ=0.04 mmyr−1), while low sensitivity quartz occurs in less stable Andean terrains (ξ=0.24 mmyr−1). An apparent linear correlation between quartz OSL sensitivity and denudation rate suggests that OSL sensitivity may be used as a proxy for erosion rates in the Amazon basin. Furthermore, luminescence sensitivity measured in sand or silt arises from the same mineral components (quartz and feldspar) and clearly discriminates between Andean and shield sediments, avoiding the grain size bias in provenance analysis. These results have implications for using luminescence sensitivity as a proxy for Andean and shield contributions in the stratigraphic record, providing a new tool to reconstruct past drainage configurations within the Amazon basin. © 2018
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被引频次[WOS]:51   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109905
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Institute of Geosciences, University of São Paulo, Rua do Lago, São Paulo, SP 562, Brazil; Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde, DK-4000, Denmark; MARUM-Center for Marine Environmental Sciences, University of Bremen, Leobener Straße 8, Bremen, D-28359, Germany; Environmental Analysis and Geoprocessing Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Av. Centenário, Piracicaba, SP 303, Brazil; Department of Ecology and Environmental Science, Umeå Universitet, KBC-huset, Linnaeus väg 6, Umeå, 901 87, Sweden; Department of Environmental Sciences, Federal University of São Paulo, Rua São Nicolau, Diadema, SP 210, Brazil; Institute of Energy and Environment, University of São Paulo, Av. Prof. Luciano Gualberto, São Paulo, SP 1289, Brazil; School of Arts, Sciences and Humanities, University of São Paulo, Av. Arlindo Bettio, São Paulo, SP 1000, Brazil

Recommended Citation:
Sawakuchi A.O.,Jain M.,Mineli T.D.,et al. Luminescence of quartz and feldspar fingerprints provenance and correlates with the source area denudation in the Amazon River basin[J]. Earth and Planetary Science Letters,2018-01-01,492
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