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Erosional history of the Western Andean Escarpment between Northern Peru and Northern Chile

Applicant Schlunegger Fritz
Number 155892
Funding scheme Project funding (Div. I-III)
Research institution Institut für Geologie Universität Bern
Institution of higher education University of Berne - BE
Main discipline Geology
Start/End 01.01.2015 - 31.08.2017
Approved amount 572'132.00
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All Disciplines (2)

Discipline
Geology
Geochronology

Keywords (4)

Cosmogenic Nuclides; Paleo Erosion Rates; Climate and Erosion; Andes

Lay Summary (German)

Lead
Klimagesteuerte Erosion in der Westabdachung der Anden zwischen Peru und N-Chile
Lay summary

Die Westabdachung der Anden zwischen Peru und N-Chile ist durch klimatische Gradienten charakterisiert. Dabei nehmen die jährlichen Niederschlagsraten entlang des andinen Gebirgszuges von Norden nach Süden ab. Zudem hat das Niederschlagsmuster im Verlaufe der Entwicklungsgeschichte der Anden variiert. Wir erwarten deshalb, dass sich diese klimatischen Gradienten im Abtragungsmuster widerspiegeln. Es ist das Ziel dieses Projektes, diese Hypothese zu testen. Dabei werden die Abtragungsraten mit Hilfe kosmogener Nuklide bestimmt. Diese Methode erlaubt es, die Erosionsgeschwindigkeiten für gesamte Einzugsgebiete zu messen. Für die letzen Zehntausende bis Hunderttausende von Jahren lassen sich klimatische Variationen in der Abtragungsschwindigkeit auf Grund von Flussterrassen rekonstruieren. Diese sedimentologischen Archive möchten wir datieren, wobei ebenfalls kosmogene Nuklide als Hilfsmittel beigezogen werden. Zudem planen wir, die Erosionsraten in der geologischen Vergangenheit zu bestimmen. Das Projekt wird von 2 Doktorierenden und einem PostDoc bearbeitet.

Direct link to Lay Summary Last update: 23.10.2014

Responsible applicant and co-applicants

Employees

Publications

Publication
Possible climatic controls on the accumulation of Peru's most prominent alluvial fan: The Lima Conglomerate
Litty Camille, Schlunegger Fritz, Akçar Naki, Lanari Pierre, Christl Marcus, Vockenhuber Christof (2018), Possible climatic controls on the accumulation of Peru's most prominent alluvial fan: The Lima Conglomerate, in Earth Surface Processes and Landforms, 44(5), 991-1003.
10Be-inferred paleo-denudation rates imply that the mid-Miocene western central Andes eroded as slowly as today
Madella Andrea, Delunel Romain, Akçar Naki, Schlunegger Fritz, Christl Marcus (2018), 10Be-inferred paleo-denudation rates imply that the mid-Miocene western central Andes eroded as slowly as today, in Scientific Reports, 8(1), 2299-2299.
Chronology of alluvial terrace sediment accumulation and incision in the Pativilca Valley, western Peruvian Andes
Litty Camille, Schlunegger Fritz, Akçar Naki, Delunel Romain, Christl Marcus, Vockenhuber Christof (2018), Chronology of alluvial terrace sediment accumulation and incision in the Pativilca Valley, western Peruvian Andes, in Geomorphology, 315, 45-56.
Possible threshold controls on sediment grain properties of Peruvian coastal river basins
Litty Camille, Schlunegger Fritz, Viveen Willem (2017), Possible threshold controls on sediment grain properties of Peruvian coastal river basins, in Earth Surface Dynamics, 5(3), 571-583.
Lack of a weathering signal with increased Cenozoic erosion?
Norton Kevin P., Schlunegger Fritz (2017), Lack of a weathering signal with increased Cenozoic erosion?, in Terra Nova.
Environmental controls on 10 Be-based catchment-averaged denudation rates along the western margin of the Peruvian Andes
Reber Regina, Delunel Romain, Schlunegger Fritz, Litty Camille, Madella Andrea, Akçar Naki, Christl Marcus (2017), Environmental controls on 10 Be-based catchment-averaged denudation rates along the western margin of the Peruvian Andes, in Terra Nova.
Late Miocene increase in precipitation in the Western Cordillera of the Andes between 18–19°S latitudes inferred from shifts in sedimentation patterns
Schlunegger Fritz, Norton Kevin P., Delunel Romain, Ehlers Todd A., Madella Andrea (2017), Late Miocene increase in precipitation in the Western Cordillera of the Andes between 18–19°S latitudes inferred from shifts in sedimentation patterns, in Earth and Planetary Science Letters, 462, 157-168.
Controls on Pebbles’ Size and Shape in Streams of the Swiss Alps
Litty Camille, Schlunegger Fritz (2017), Controls on Pebbles’ Size and Shape in Streams of the Swiss Alps, in The Journal of Geology, 125(1), 101-112.
Climate-controlled shifts in sediment provenance inferred from detrital zircon ages, western Peruvian Andes
Litty Camille, Lanari Pierre, Burn Marco, Schlunegger Fritz (2016), Climate-controlled shifts in sediment provenance inferred from detrital zircon ages, western Peruvian Andes, in Geology, 45(1), 59-62.
Why is there no Coastal Cordillera at the Arica Bend (Western Central Andes)?
Madella Andrea, Delunel Romain, Audin Laurence, Schlunegger Fritz (2016), Why is there no Coastal Cordillera at the Arica Bend (Western Central Andes)?, in Basin Research.
Paleohydraulic reconstruction of a 40 ka-old terrace sequence implies that water discharge was larger than todayPaleohydraulic Reconstruction in the Pisco Valley, Peru
Litty Camille, Duller Robert, Schlunegger Fritz (2016), Paleohydraulic reconstruction of a 40 ka-old terrace sequence implies that water discharge was larger than todayPaleohydraulic Reconstruction in the Pisco Valley, Peru, in Earth Surface Processes and Landforms, 41(7), 884-898.
On the potential for regolith control of fluvial terrace formation in semi-arid escarpments
Norton K. P., Schlunegger F., Litty C. (2016), On the potential for regolith control of fluvial terrace formation in semi-arid escarpments, in Earth Surface Dynamics, 4(1), 147-157.
Transient uplift of a long-term quiescent coast inferred from raised fan delta sediments
Andrea Madella Romain Delunel Onno Oncken Sönke Szidat Fritz Schlunegger, Transient uplift of a long-term quiescent coast inferred from raised fan delta sediments, in Lithosphere.

Collaboration

Group / person Country
Types of collaboration
Prof. K. Mezger, Institute of Geological Sciences, University of Berne Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Dr. M. Christl, Laboratory of Ion Beam Physics, ETHZ Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
PD Dr. N. Akçar, Institute of Geological Sciences, Univ. Bern Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Dr. R. Delunel, Institute of Geological Sciences, University of Bern Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
PD Dr. I. Leya, Institute of Physics, University of Bern Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Dr. K. P. Norton, Geography, Environment and Earth Sciences, Victoria University New Zealand (Oceania)
- in-depth/constructive exchanges on approaches, methods or results
Prof. I. Villa, Institute of Geological Sciences, University of Bern Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Associated projects

Number Title Start Funding scheme
163994 Upgrading an extraction and purification line for measuring terrestrial cosmogenic noble gases 01.01.2016 R'EQUIP
137516 Chronology of surface erosion in the western Peruvian Andes in response to climate variations: Calibration by OSL dating and multiple cosmogenic nuclide analyses 01.01.2012 Project funding (Div. I-III)

Abstract

We focus on the western Andean margin between northern Peru and northern Chile where we aim to explore the response of erosion to climate change at orbital to Myr time scales. The climate in the central Andes is characterized by strong north-south and east-west precipitation gradients, has experienced orbital changes in precipitation regimes as documented by variations in lake level highstands on the Altiplano, and has likewise been affected by shifts in the Andean jet in response to the rise of Altiplano. This proposal focuses on the several tens of meters-thick Quaternary cut-and-fill terrace sequences that bear information about orbital-driven changes in erosional regimes, as our previous studies have shown. The applicant has identified five sites between 10S° and 20°S where these terraces will be investigated upon climate-driven changes in modern and paleo erosional patterns and rates. The plan is to: (i) date these archives, (ii) measure (paleo) erosion rates recorded by these deposits, (iii) determine the provence of these deposits, and (iv) improve the age models.The dating of the Quaternary archives will be achieved with in-situ terrestrial cosmogenic nuclides (TCNs). Here, 10Be and 26Al depth-profile and burial-isochron dating techniques yield a chronology where other techniques (optically stimulated luminescence techniques, 14C) have failed to date these archives. To this extent, we have already collected TCN samples at c. 15 sites that we plan to process within the framework of this project. Also at these sites, concentrations of cosmogenic 10Be, 26Al, 21Ne and possibly 3He will be measured to determine the (paleo) erosion rates recorded by the modern stream and Quaternary terrace sediments. A first set of samples was already collected in the framework of the precursory project. They need to be processed in the laboratory and measured for the concentrations of the TCNs in quartz and pyroxene minerals. We have additionally sampled an 13-11 Ma-old section in northern Chile to measure paleo erosion rates with cosmogenic 21Ne and 3He. This sequence chronicles a sedimentological change from debris flow processes before 10 Ma to fluvial processes thereafter. This implies that the availability of water and the related rainfall patterns have changed possibly in response to the rise of the Altiplano plateau. The application of cosmogenic 21Ne and 3He to these deposits will allow us to ascertain whether this environmental shift had a measurable impact on the paleo erosion rates. Our previous studies have shown that the provenance of the sediments most likely changed as orbital climate variations were associated by shifts in the location where fast erosion has occurred. Because the headwaters and the trunk valley reaches of the Andean expose different lithologies, any shifts in erosional sites will release material with a different petrographic composition, which we plan to quantify with provenance tracing methods.
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