Projekt

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Tropical volcanic islands erosion and landscape evolution - Earth surface geochronology, morphometry and numerical modeling

Gesuchsteller/in Valla Pierre
Nummer 148191
Förderungsinstrument Ambizione
Forschungseinrichtung Institut des dynamiques de la surface terrestre Université de Lausanne
Hochschule Universität Lausanne - LA
Hauptdisziplin Geologie
Beginn/Ende 01.10.2013 - 30.09.2016
Bewilligter Betrag 572'758.00
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Alle Disziplinen (2)

Disziplin
Geologie
Geochronologie

Keywords (7)

morphometry; erosion; quantitative geomorphology; earth surface geochronology; landscape evolution; tropical volcanic island; numerical modeling

Lay Summary (Französisch)

Lead
Les îles volcaniques en climat tropical reflètent les interactions entre les processus volcaniques et climatiques via leur contribution respective à l’évolution des paysages et les processus d’érosion. Les îles volcaniques sont des environnements de petite taille, avec une histoire volcanique bien étudiée et un climat tropical stable.
Lay summary

La variabilité spatio-temporelle des taux d’érosion, de même que l’évolution long-terme de ces îles, restent très peu connues car les méthodes géochronologiques utilisées dans les chaînes de montagne restent difficilement applicables en milieu volcanique. Ce projet a pour objectif d’apporter des réponses quant à la dynamique d’érosion opérant dans ces îles, afin de mieux appréhender les différentes contributions climatiques et volcaniques dans l’évolution topographique. De récents développements méthodologiques en géochronologie de surface (i.e. nucléides cosmogéniques et luminescence) ouvrent de nouvelles perspectives en environnement volcanique. Le projet s’articule sur ces méthodes, complétées par des analyses morphométriques et la modélisation numérique, et cible deux îles caractéristiques d’un milieu volcanique en climat tropical : La Réunion (Océan Indien) et La Guadeloupe (Mer des Caraïbes). Il se décline suivant deux tâches principales : (1) quantifier les taux d’érosion et l’évolution de la topographie; et (2) explorer les interactions entre volcanisme et climat tropical dans l’évolution géomorphologique long-terme de ces îles. Ces résultats compléteront les données d’érosion court-terme et les volumes érodés obtenus par reconstruction des édifices volcaniques. Par ailleurs, une meilleure connaissance de la réponse des paysages respectivement aux forçages climatique et volcanique est importante afin de mieux appréhender la gestion des risques naturels. Enfin, ces îles sont des acteurs majeurs dans les cycles d’altération globale et de régulation du CO2 atmosphérique.

Direktlink auf Lay Summary Letzte Aktualisierung: 03.09.2013

Verantw. Gesuchsteller/in und weitere Gesuchstellende

Mitarbeitende

Publikationen

Publikation
Exploring IRSL50 fading variability in bedrock feldspars and implications for OSL thermochronometry
(2016), Exploring IRSL50 fading variability in bedrock feldspars and implications for OSL thermochronometry, in Quaternary Georchronology, 36, 55-66.
Multi-OSL thermochronometry of feldspar. Quaternary Geochronology
(2016), Multi-OSL thermochronometry of feldspar. Quaternary Geochronology, in Quaternary Georchronology, 33, 76-87.
Pedogenic carbonate nodules as soil time archives: Challenges and investigations related to OSL dating
(2016), Pedogenic carbonate nodules as soil time archives: Challenges and investigations related to OSL dating, in Quaternary Geochronologx, 36, 120-133.
Controls on the spatial variability in 10Be denudation rates across the southern Peninsular Indian escarpment
(2015), Controls on the spatial variability in 10Be denudation rates across the southern Peninsular Indian escarpment, in Earth and Planetary Science Letters, 425, 154-167.
Estimating rock cooling rates by using multiple luminescence thermochronometers
(2015), Estimating rock cooling rates by using multiple luminescence thermochronometers, in Radiation Measurements, 79, 13-18.
Low-temperature thermochronology of the Yakutat Plate corner, St. Elias Range (Alaska): bridging short-term and long-term deformation
(2015), Low-temperature thermochronology of the Yakutat Plate corner, St. Elias Range (Alaska): bridging short-term and long-term deformation, in Quaternary Science Reviews, 13, 23-38.
OSL-thermochronometry of feldspar from the KTB borehole, Germany
(2015), OSL-thermochronometry of feldspar from the KTB borehole, Germany, in Earth and Planetary Science Letters, 423, 232-243.
Radiation-induced growth and isothermal decay of feldspar IRSL
(2015), Radiation-induced growth and isothermal decay of feldspar IRSL, in Radiation Measurements, 81, 224-231.
Late-Cenozoic relief evolution under evolving climate: A review
(2014), Late-Cenozoic relief evolution under evolving climate: A review, in Tectonophysics, 614, 44-65.
Deciphering neotectonics from river profile analysis in the karstic Jura Mountains (European Alps)
, Deciphering neotectonics from river profile analysis in the karstic Jura Mountains (European Alps), in Swiss Journal of Geosciences, 1-24.
Multi-phase late-Neogene exhumation history of the Aar massif, Swiss central Alps
, Multi-phase late-Neogene exhumation history of the Aar massif, Swiss central Alps, in Terra Nova, 1.
Trapped-charge thermochronometry and thermometry: A status review
, Trapped-charge thermochronometry and thermometry: A status review, in Chemical Geology, 1.

Zusammenarbeit

Gruppe / Person Land
Formen der Zusammenarbeit
University of Lausanne - IDYST Schweiz (Europa)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
- Publikation
- Forschungsinfrastrukturen
IPG Paris Frankreich (Europa)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
- Publikation
- Forschungsinfrastrukturen
University of Bern - Geological Institute Schweiz (Europa)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
- Publikation
- Forschungsinfrastrukturen
Geosciences Réunion Frankreich (Europa)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
- Publikation
- Forschungsinfrastrukturen
CRPG Nancy Frankreich (Europa)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
- Forschungsinfrastrukturen

Wissenschaftliche Veranstaltungen

Aktiver Beitrag

Titel Art des Beitrags Titel des Artikels oder Beitrages Datum Ort Beteiligte Personen
Swiss Geosciences Meeting 2016 Vortrag im Rahmen einer Tagung Coupling and feedbacks between orographic precipitations and landscape evolution: Basse Terre Island, Guadeloupe archipelago (Lesser Antilles Arc) 01.09.2016 Geneva, Schweiz Valla Pierre;
UK Luminescence Meeting 2016 Poster Investigating frictionite OSL dating in a giant rockslide 10.07.2016 Liverpool, Grossbritannien und Nordirland Valla Pierre;
EGU General Assembly 2016 Vortrag im Rahmen einer Tagung Progressive impact of glaciation on mountain erosion and topography: insights from in-situ thermochronometry 18.04.2016 Vienna, Oesterreich Valla Pierre;
EGU General Assembly 2016 Poster Late-Quaternary exhumation rates constrained by OSL thermochronometry at the Franz Josef Glacier, New Zealand 18.04.2016 VIenna, Oesterreich Valla Pierre; Duverger Arnaud;
EGU General Assembly 2016 Poster River dynamics and landscape evolution in La Réunion Island: insights from luminescence dating 18.04.2016 Vienna, Oesterreich Valla Pierre;
Department Seminars, IPGP University Sorbonne Paris Cité Einzelvortrag Unraveling tectonics and climatically-induced surface processes in the exhumation history of South Alaska 15.02.2016 Paris, Frankreich Valla Pierre;
Swiss Geosciences Meeting 2015 Vortrag im Rahmen einer Tagung Time-transgressive latitudinal impact of glaciations on mountain erosion since the Late Miocene 21.11.2015 Basel, Schweiz Valla Pierre;
Swiss Geosciences Meeting 2015 Poster Orographic precipitations and landscape evolution in Basse Terre Island, Guadeloupe archipelago (Lesser Antilles Arc) 21.11.2015 Basel, Schweiz Valla Pierre;
Department Seminars, University Orsay Paris Sud Einzelvortrag Progressive impact of glaciation on mountain erosion since the Late Cenozoic 11.11.2015 Orsay, Frankreich Valla Pierre;
Earth Sciences Department Seminars, University of Bern Einzelvortrag Progressive impact of glaciation on mountain erosion since the Late Miocene: insights from low-temperature thermochronometry 26.10.2015 Bern, Schweiz Valla Pierre;
Geosciences Department Seminars, University of Rennes 1 Einzelvortrag Unraveling tectonics and climatically-induced surface processes in the exhumation history of South Alaska 29.05.2015 Rennes, Frankreich Valla Pierre;
EGU General Assembly 2015 Vortrag im Rahmen einer Tagung Unravelling tectonics and surface processes in exhumation history of South Alaska: insights from the thermochronological record 12.04.2015 Vienna, Oesterreich Valla Pierre;
EGU General Assembly 2015 Poster Deciphering tectonic, climatic-induced and hydrothermal signals in the late-stage exhumation history of the upper Rhône valley (Swiss Alps) 12.04.2015 Vienna, Oesterreich Valla Pierre;
Earth Sciences Department Seminars, University of Geneva Einzelvortrag Quantifying near-surface exhumation processes and relief evolution using low-temperature thermochronometry (Alaska and European Alps) 06.03.2015 Geneva, Schweiz Valla Pierre;
Institute Seminars, University of Lausanne Einzelvortrag Unravelling tectonics and surface processes in exhumation history of South Alaska 16.02.2015 Lausanne, Schweiz Valla Pierre;
Geosciences Institute Seminars, University of Lyon 1 Einzelvortrag Quantifying Earth surface processes and landscape dynamics : Multi-scale approach of Alpine relief evolution during the Quaternary 13.02.2015 Lyon, Frankreich Valla Pierre;
AGU Fall Meeting 2014 Poster Constraining paleo-glacier dynamics using Optically Stimulated Luminescence (OSL) bedrock exposure dating 15.12.2014 San Fransisco, Vereinigte Staaten von Amerika Valla Pierre;
Swiss Geosciences Meeting 2014 Vortrag im Rahmen einer Tagung Unravelling tectonics and surface processes in exhumation history of South Alaska: insights from the thermochronological record 21.11.2014 Fribourg, Deutschland Valla Pierre;
Environmental Geosciences Department Seminars 2014, University Aix-Marseille Einzelvortrag Quantifying near-surface exhumation processes using OSL thermochronometry 20.11.2014 Aix en Provence, Frankreich Valla Pierre;
Geosciences Department Seminars 2014, University Pierre & Marie Curie Einzelvortrag Unravelling tectonics and surface processes in exhumation history of South Alaska: insights from the thermochronological record 14.11.2014 Paris, Frankreich Valla Pierre;
Thermo2014 Meeting Vortrag im Rahmen einer Tagung OSL-Thermochronometry: observations, theory, and applications 15.09.2014 Chamonix, Frankreich Valla Pierre;
Geosciences Department Seminars 2014 - ISTerre Univ. Grenoble Einzelvortrag Decoupling the relative contributions from tectonics and glaciations to St. Elias Range exhumation (South Alaska) 11.07.2014 Grenoble, Frankreich Valla Pierre;
EGU General Assembly 2014 Poster Tectonics and surface processes interactions in exhumation history of South Alaska: insights from the thermochronological record 27.04.2014 Vienna, Oesterreich Valla Pierre;
Swiss Geosciences Meeting 2013 Poster Exploring feldspar IRSL-50 as a low-temperature thermochronometer: insights from field applications (Alaska, Norway and Pamir). 15.11.2013 Lausanne, Schweiz Valla Pierre;
Swiss Geosciences Meeting 2013 Vortrag im Rahmen einer Tagung Exhumation history, topographic relief evolution and geothermal activity in the Swiss Central Alps (Rhône valley): insights from low-temperature thermochronology. 15.11.2013 Lausanne, Schweiz Valla Pierre;


Auszeichnungen

Titel Jahr
EGU Outstanding Young Scientists Award, Geomorphology Division. European Geosciences Union 2016

Verbundene Projekte

Nummer Titel Start Förderungsinstrument
170559 GlaciEr-Alps: Glacier dynamics, erosion patterns and Alpine paleoclimate over the last glacial cycle 01.04.2017 SNF-Förderungsprofessuren
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 Projektförderung (Abt. I-III)
138956 Constraining glacial erosion processes using thermochronology and landscape evolution modeling 01.09.2012 SNF-Förderungsprofessuren
163994 Upgrading an extraction and purification line for measuring terrestrial cosmogenic noble gases 01.01.2016 R'EQUIP

Abstract

The Earth surface lies at the interface between the Lithosphere and Atmosphere, hence topographic evolution reflects the integrated response to interactions and feedbacks between endogenic (tectonics, volcanism) and exogenic (climate, sea-level variations) processes. Scientific research has mainly focused on active mountain ranges to explore these links, recent studies relying on developments in earth surface geochronology and modeling methods. However, deciphering the endogenic vs. exogenic contributions in mountain ranges evolution still appears difficult, in part due to the difference in characteristic timescale between the lithospheric (10^6-10^7 years) and atmospheric (10^4-10^5 years) processes. Tropical volcanic islands encompass similar interactions, with competing effects in their long-term evolution. Although these settings exhibit stunning landscapes and intense erosion dynamics, limited research has been dedicated to the interplay between volcanism, climate, and landscape evolution. Tropical volcanic islands are small-scale settings, with relative spatially uniform effusive basaltic/andesitic lithologies. They encompass a well-defined climatic forcing with stable tropical humid climate and a strong orographic precipitation pattern. Moreover, detailed information on volcanic forcing exists, with precise and independent knowledge of both the timing and spatial extent of effusive events through the dating of lava flow and shape reconstruction of initial volcanic edifice. Knowledge of the relative contributions of endogenic and exogenic forcing in island evolution makes them appropriate natural laboratories for investigating such interactions. However, erosion variability and geomorphic evolution remain there poorly constrained, in part due to limited application of earth surface geochronology tools. Quantifying landscape dynamics therefore requires further investigation to gain a better understanding of the landscape response to climatic and volcanic processes.Novel methodological developments in luminescence systems and in situ cosmogenic noble gas dating open new directions in earth surface geochronology applied to volcanic islands. The present project proposes to develop an integrated research program focused on the Réunion and Guadeloupe Islands as natural laboratories. They encompass similar climatic forcing (i.e. tropical humid climate with strong orography) but different volcanic dynamics: the Réunion Island displays continuous hot-spot basaltic volcanism, whereas andesitic arc activity has progressively migrated southward in the Guadeloupe Island. The present-day topographies of the two islands differ strongly, raising the question of how erosion and landscape respond to the respective contributions from climate and volcanic activity. The present project aims at developing a multi-disciplinary program at the University of Lausanne (Institute of Earth Sciences) to (1) quantify topographic evolution using luminescence thermochronometry, (2) address fluvial dynamics and catchment-scale erosion variability using luminescence and in situ cosmogenic noble gas surface exposure dating, and (3) explore the interactions between tropical climate, volcanic activity and earth surface processes using morphometry and state-of-the-art numerical modeling. This is of prime importance to quantitatively explore the causal links and feedbacks between the Lithosphere, Atmosphere and landscape dynamics in volcanic island evolution. The proposed project will lead first to a better understanding of how the different earth surface processes interact in volcanic island landscape evolution. The Réunion and Guadeloupe Islands settings are appropriate natural laboratories to quantitatively explore how erosion and landscape respond to the respective endogenic and exogenic forcing. Quantitative erosion data will fill the existing gap between integrated eroded volumes deduced from shape reconstructions and present-day to decadal sediment fluxes or geochemical estimates. This will allow to fully explore the causal links and strong feedbacks existing between climate, volcanism and landscape dynamics in such environments, and will bring new ideas and physical concepts that would be tested in more complex mountain ranges. Moreover, this project has important societal interests. Tropical volcanic islands experience low-frequency events, such as tropical storms or volcanic eruptions, which are extremely difficult to forecast but have considerable impact on human habitability. The understanding and quantification of landscape response to these extreme events will have valuable consequence on natural hazards and risk assessment. Finally, volcanic islands are major components in global weathering and atmospheric carbon flux regulations, therefore requiring a better quantification of long-term erosion. The multi-disciplinary project promotes the application of modern and innovative quantitative methods in earth surface geochronology to volcanic settings, with a special attention to further methodological development for both thermochronometry and surface exposure dating. The research plan also includes strong national (University of Lausanne and University of Bern) and international collaborations, providing high visibility to the project within the Geosciences community.
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