10Be-inferred paleo-denudation rates imply that the mid-Miocene western central Andes eroded as slowly as today

Abstract Terrestrial cosmogenic nuclide concentrations of detrital minerals yield catchment-wide rates at which hillslopes erode. These estimates are commonly used to infer millennial scale denudation patterns and to identify the main controls on mass-balance and landscape evolution at orogenic scal...

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Autores principales:	Andrea Madella, Romain Delunel, Naki Akçar, Fritz Schlunegger, Marcus Christl
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e71e2521142343e69447c96a1ad0e17a
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spelling	oai:doaj.org-article:e71e2521142343e69447c96a1ad0e17a2021-12-02T15:08:37Z10Be-inferred paleo-denudation rates imply that the mid-Miocene western central Andes eroded as slowly as today10.1038/s41598-018-20681-x2045-2322https://doaj.org/article/e71e2521142343e69447c96a1ad0e17a2018-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-20681-xhttps://doaj.org/toc/2045-2322Abstract Terrestrial cosmogenic nuclide concentrations of detrital minerals yield catchment-wide rates at which hillslopes erode. These estimates are commonly used to infer millennial scale denudation patterns and to identify the main controls on mass-balance and landscape evolution at orogenic scale. The same approach can be applied to minerals preserved in stratigraphic records of rivers, although extracting reliable paleo-denudation rates from Ma-old archives can be limited by the target nuclide’s half-life and by exposure to cosmic radiations after deposition. Slowly eroding landscapes, however, are characterized by the highest cosmogenic radionuclide concentrations; a condition that potentially allows pushing the method’s limits further back in time, provided that independent constraints on the geological evolution are available. Here, we report 13–10 million-year-old paleo-denudation rates from northernmost Chile, the oldest 10Be-inferred rates ever reported. We find that at 13–10 Ma the western Andean Altiplano has been eroding at 1–10 m/Ma, consistent with modern paces in the same setting, and it experienced a period with rates above 10 m/Ma at ~11 Ma. We suggest that the background tectono-geomorphic state of the western margin of the Altiplano has remained stable since the mid-Miocene, whereas intensified runoff since ~11 Ma might explain the transient increase in denudation.Andrea MadellaRomain DelunelNaki AkçarFritz SchluneggerMarcus ChristlNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Andrea Madella Romain Delunel Naki Akçar Fritz Schlunegger Marcus Christl 10Be-inferred paleo-denudation rates imply that the mid-Miocene western central Andes eroded as slowly as today
description	Abstract Terrestrial cosmogenic nuclide concentrations of detrital minerals yield catchment-wide rates at which hillslopes erode. These estimates are commonly used to infer millennial scale denudation patterns and to identify the main controls on mass-balance and landscape evolution at orogenic scale. The same approach can be applied to minerals preserved in stratigraphic records of rivers, although extracting reliable paleo-denudation rates from Ma-old archives can be limited by the target nuclide’s half-life and by exposure to cosmic radiations after deposition. Slowly eroding landscapes, however, are characterized by the highest cosmogenic radionuclide concentrations; a condition that potentially allows pushing the method’s limits further back in time, provided that independent constraints on the geological evolution are available. Here, we report 13–10 million-year-old paleo-denudation rates from northernmost Chile, the oldest 10Be-inferred rates ever reported. We find that at 13–10 Ma the western Andean Altiplano has been eroding at 1–10 m/Ma, consistent with modern paces in the same setting, and it experienced a period with rates above 10 m/Ma at ~11 Ma. We suggest that the background tectono-geomorphic state of the western margin of the Altiplano has remained stable since the mid-Miocene, whereas intensified runoff since ~11 Ma might explain the transient increase in denudation.
format	article
author	Andrea Madella Romain Delunel Naki Akçar Fritz Schlunegger Marcus Christl
author_facet	Andrea Madella Romain Delunel Naki Akçar Fritz Schlunegger Marcus Christl
author_sort	Andrea Madella
title	10Be-inferred paleo-denudation rates imply that the mid-Miocene western central Andes eroded as slowly as today
title_short	10Be-inferred paleo-denudation rates imply that the mid-Miocene western central Andes eroded as slowly as today
title_full	10Be-inferred paleo-denudation rates imply that the mid-Miocene western central Andes eroded as slowly as today
title_fullStr	10Be-inferred paleo-denudation rates imply that the mid-Miocene western central Andes eroded as slowly as today
title_full_unstemmed	10Be-inferred paleo-denudation rates imply that the mid-Miocene western central Andes eroded as slowly as today
title_sort	10be-inferred paleo-denudation rates imply that the mid-miocene western central andes eroded as slowly as today
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/e71e2521142343e69447c96a1ad0e17a
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10Be-inferred paleo-denudation rates imply that the mid-Miocene western central Andes eroded as slowly as today

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