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A 4D Model of Neogene Exhumation in the Central Helvetic Alps

English title A 4D Model of Neogene Exhumation in the Central Helvetic Alps
Applicant Mancktelow Neil S.
Number 137510
Funding scheme Project funding
Research institution Geologisches Institut ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Geology
Start/End 01.10.2011 - 31.03.2013
Approved amount 107'326.00
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Keywords (6)

deformation; exhumation; fluid-rock interaction; seismic faulting; Helvetic nappes; European Alps

Lay Summary (English)

Lead
Lay summary
This project aims to establish the geometry, kinematics, mechanisms and relative and absolute timing of ductile-brittle deformation related to extension/transtension and exhumation in the Rawil Depression (central Helvetic Alps), within the footwall of the Rhône-Simplon fault zone. The nappe stack in the Rawil Depression between the Aar and Mont Blanc massifs is overprinted by dominantly dextral transtensional faults developed or reactivated during the Neogene (i.e. < 24 Ma). This area shows the evolution, during exhumation, of fault systems from partially ductile to brittle conditions. However, the interplay between extension and exhumation in the Rawil Depression is still not well understood, especially with regard to the pressure (depth) - temperature - time history and the source and composition of fluids involved. The project will develop a 4D model of deformation and exhumation for the Rawil Depression from Neogene to recent times. In following this aim, it will also consider the importance of re-activation of precursor structures, such as syn-sedimentary faults, on the overall tectonic architecture, as well as the mechanism of transtensional oblique-slip fault development and the influence of fluid-rock interaction during brittle-ductile deformation. The exhumed fossil faults can also act as models for currently active faults at depth in this most seismically disturbed region of Switzerland.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Collaboration

Group / person Country
Types of collaboration
Dr. Horst Zwingmann / CSIRO Perth Australia (Oceania)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
Prof. Ann Hirt / Inst. f. Geophysik ETH Zurich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
Dr. Bjarne Almqvist / Geologisches Inst. ETH Zurich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
Dr. Maria Giuditta Fellin / Institut f. Geochemie und Petrologie ETH Zurich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
Prof. Stefano Bernasconi/Geologisches Inst. ETH Zurich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure

Associated projects

Number Title Start Funding scheme
134469 TOPOALPS - 4D kinematics of the Neogene western Alps (IP2) 01.06.2011 Project funding
121578 A 4D Model of Neogene Exhumation in the Central Helvetic Alps 01.10.2008 Project funding

Abstract

This project aims to establish the geometry, kinematics, mechanism(s) and (relative and absolute) timing of ductile-brittle deformation related to extension/transtension and exhumation in the Rawil Depression (central Helvetic Alps), within the footwall of the Rhône-Simplon fault zone. The nappe stack in the Rawil Depression between the Aar and Mont Blanc massifs is overprinted by dominantly dextral transtensional faults developed or reactivated during the Neogene. This area shows the evolution, during exhumation, of fault systems from partially ductile to brittle conditions. However, the interplay between extension and exhumation in the Rawil Depression is still not well understood, especially with regard to the P (depth)-T-t history and the source and composition of fluids involved. The project will develop a 4D model of deformation and exhumation for the Rawil Depression from Neogene to recent times. In following this aim, it will also consider the importance of re-activation of precursor structures, such as syn-sedimentary faults, on the overall tectonic architecture, as well as the mechanism of transtensional oblique-slip fault development and the influence of fluid-rock interaction during brittle-ductile deformation. The exhumed fossil faults can also act as models for currently active faults at depth in this most seismically disturbed region of Switzerland.
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