Paleo erosion rates and climate shifts recorded by Quaternary cut-and-fill sequences in the Pisco valley, central Peru
Fluvial cut-and-fill sequences have frequently been reported from various sites on Earth. Nevertheless, the information about the past erosional regime and hydrological conditions have not yet been adequately deciphered from these archives. The Quaternary terrace sequences in the Pisco valley, locat...
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ftunivbern:oai:boris.unibe.ch:45268 2023-08-20T04:07:17+02:00 Paleo erosion rates and climate shifts recorded by Quaternary cut-and-fill sequences in the Pisco valley, central Peru Bekaddour, Toufik Schlunegger, Fritz Vogel, Hendrik Delunel, Romain Norton, Kevin Akçar, Naki Kubik, Peter 2014 application/pdf https://boris.unibe.ch/45268/1/1-s2.0-S0012821X14000041-main.pdf https://boris.unibe.ch/45268/ eng eng Elsevier https://boris.unibe.ch/45268/ info:eu-repo/semantics/restrictedAccess Bekaddour, Toufik; Schlunegger, Fritz; Vogel, Hendrik; Delunel, Romain; Norton, Kevin; Akçar, Naki; Kubik, Peter (2014). Paleo erosion rates and climate shifts recorded by Quaternary cut-and-fill sequences in the Pisco valley, central Peru. Earth and planetary science letters, 390, pp. 103-115. Elsevier 10.1016/j.epsl.2013.12.048 <http://dx.doi.org/10.1016/j.epsl.2013.12.048> 550 Earth sciences & geology info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2014 ftunivbern https://doi.org/10.1016/j.epsl.2013.12.048 2023-07-31T21:04:31Z Fluvial cut-and-fill sequences have frequently been reported from various sites on Earth. Nevertheless, the information about the past erosional regime and hydrological conditions have not yet been adequately deciphered from these archives. The Quaternary terrace sequences in the Pisco valley, located at ca. 13°S, offer a manifestation of an orbitally-driven cyclicity in terrace construction where phases of sediment accumulation have been related to the Minchin (48–36 ka) and Tauca (26–15 ka) lake level highstands on the Altiplano. Here, we present a 10Be-based sediment budget for the cut-and-fill terrace sequences in this valley to quantify the orbitally forced changes in precipitation and erosion. We find that the Minchin period was characterized by an erosional pulse along the Pacific coast where denudation rates reached values as high as 600±80 mm/ka600±80 mm/ka for a relatively short time span lasting a few thousands of years. This contrasts to the younger pluvial periods and the modern situation when 10Be-based sediment budgets register nearly zero erosion at the Pacific coast. We relate these contrasts to different erosional conditions between the modern and the Minchin time. First, the sediment budget infers a precipitation pattern that matches with the modern climate ca. 1000 km farther north, where highly erratic and extreme El Niño-related precipitation results in fast erosion and flooding along the coast. Second, the formation of a thick terrace sequence requires sufficient material on catchment hillslopes to be stripped off by erosion. This was most likely the case immediately before the start of the Minchin period, because this erosional epoch was preceded by a >50 ka-long time span with poorly erosive climate conditions, allowing for sufficient regolith to build up on the hillslopes. Finally, this study suggests a strong control of orbitally and ice sheet forced latitudinal shifts of the ITCZ on the erosional gradients and sediment production on the western escarpment of the Peruvian Andes at ... Article in Journal/Newspaper Ice Sheet BORIS (Bern Open Repository and Information System, University of Bern) Pacific Pisco ENVELOPE(-62.450,-62.450,-62.950,-62.950) The Altiplano ENVELOPE(163.917,163.917,-78.133,-78.133) Earth and Planetary Science Letters 390 103 115 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
550 Earth sciences & geology |
spellingShingle |
550 Earth sciences & geology Bekaddour, Toufik Schlunegger, Fritz Vogel, Hendrik Delunel, Romain Norton, Kevin Akçar, Naki Kubik, Peter Paleo erosion rates and climate shifts recorded by Quaternary cut-and-fill sequences in the Pisco valley, central Peru |
topic_facet |
550 Earth sciences & geology |
description |
Fluvial cut-and-fill sequences have frequently been reported from various sites on Earth. Nevertheless, the information about the past erosional regime and hydrological conditions have not yet been adequately deciphered from these archives. The Quaternary terrace sequences in the Pisco valley, located at ca. 13°S, offer a manifestation of an orbitally-driven cyclicity in terrace construction where phases of sediment accumulation have been related to the Minchin (48–36 ka) and Tauca (26–15 ka) lake level highstands on the Altiplano. Here, we present a 10Be-based sediment budget for the cut-and-fill terrace sequences in this valley to quantify the orbitally forced changes in precipitation and erosion. We find that the Minchin period was characterized by an erosional pulse along the Pacific coast where denudation rates reached values as high as 600±80 mm/ka600±80 mm/ka for a relatively short time span lasting a few thousands of years. This contrasts to the younger pluvial periods and the modern situation when 10Be-based sediment budgets register nearly zero erosion at the Pacific coast. We relate these contrasts to different erosional conditions between the modern and the Minchin time. First, the sediment budget infers a precipitation pattern that matches with the modern climate ca. 1000 km farther north, where highly erratic and extreme El Niño-related precipitation results in fast erosion and flooding along the coast. Second, the formation of a thick terrace sequence requires sufficient material on catchment hillslopes to be stripped off by erosion. This was most likely the case immediately before the start of the Minchin period, because this erosional epoch was preceded by a >50 ka-long time span with poorly erosive climate conditions, allowing for sufficient regolith to build up on the hillslopes. Finally, this study suggests a strong control of orbitally and ice sheet forced latitudinal shifts of the ITCZ on the erosional gradients and sediment production on the western escarpment of the Peruvian Andes at ... |
format |
Article in Journal/Newspaper |
author |
Bekaddour, Toufik Schlunegger, Fritz Vogel, Hendrik Delunel, Romain Norton, Kevin Akçar, Naki Kubik, Peter |
author_facet |
Bekaddour, Toufik Schlunegger, Fritz Vogel, Hendrik Delunel, Romain Norton, Kevin Akçar, Naki Kubik, Peter |
author_sort |
Bekaddour, Toufik |
title |
Paleo erosion rates and climate shifts recorded by Quaternary cut-and-fill sequences in the Pisco valley, central Peru |
title_short |
Paleo erosion rates and climate shifts recorded by Quaternary cut-and-fill sequences in the Pisco valley, central Peru |
title_full |
Paleo erosion rates and climate shifts recorded by Quaternary cut-and-fill sequences in the Pisco valley, central Peru |
title_fullStr |
Paleo erosion rates and climate shifts recorded by Quaternary cut-and-fill sequences in the Pisco valley, central Peru |
title_full_unstemmed |
Paleo erosion rates and climate shifts recorded by Quaternary cut-and-fill sequences in the Pisco valley, central Peru |
title_sort |
paleo erosion rates and climate shifts recorded by quaternary cut-and-fill sequences in the pisco valley, central peru |
publisher |
Elsevier |
publishDate |
2014 |
url |
https://boris.unibe.ch/45268/1/1-s2.0-S0012821X14000041-main.pdf https://boris.unibe.ch/45268/ |
long_lat |
ENVELOPE(-62.450,-62.450,-62.950,-62.950) ENVELOPE(163.917,163.917,-78.133,-78.133) |
geographic |
Pacific Pisco The Altiplano |
geographic_facet |
Pacific Pisco The Altiplano |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Bekaddour, Toufik; Schlunegger, Fritz; Vogel, Hendrik; Delunel, Romain; Norton, Kevin; Akçar, Naki; Kubik, Peter (2014). Paleo erosion rates and climate shifts recorded by Quaternary cut-and-fill sequences in the Pisco valley, central Peru. Earth and planetary science letters, 390, pp. 103-115. Elsevier 10.1016/j.epsl.2013.12.048 <http://dx.doi.org/10.1016/j.epsl.2013.12.048> |
op_relation |
https://boris.unibe.ch/45268/ |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2013.12.048 |
container_title |
Earth and Planetary Science Letters |
container_volume |
390 |
container_start_page |
103 |
op_container_end_page |
115 |
_version_ |
1774718796955648000 |