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Luminescence of quartz and feldspar fingerprints provenance and correlates with the source area denudation in the Amazon River basin
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2018 (English)In: Earth and Planetary Science Letters, ISSN 0012-821X, E-ISSN 1385-013X, Vol. 492, p. 152-162Article in journal (Refereed) Published
Abstract [en]

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, Tapajos and Xingu Rivers show more sensitive quartz than Solimbes 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 xi = 0.04 mm yr(-1)), while low sensitivity quartz occurs in less stable Andean terrains (xi = 0.24 mm yr(-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.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 492, p. 152-162
Keywords [en]
sediment provenance, luminescence, denudation, tropical rivers, Amazon
National Category
Geology
Identifiers
URN: urn:nbn:se:umu:diva-148715DOI: 10.1016/j.epsl.2018.04.006ISI: 000432762000015Scopus ID: 2-s2.0-85045440268OAI: oai:DiVA.org:umu-148715DiVA, id: diva2:1221152
Available from: 2018-06-19 Created: 2018-06-19 Last updated: 2018-08-10Bibliographically approved

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Sawakuchi, Henrique O.

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