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The role of sheet silicate-rich rocks during mountain building processes

English title The role of sheet silicate-rich rocks during mountain building processes
Applicant Herwegh-Züger Marco
Number 144381
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 01.01.2013 - 31.12.2015
Approved amount 389'938.00
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All Disciplines (2)

Discipline
Geology
Mineralogy

Keywords (5)

rheology; sheet silcate; liberation of fluids; flow pathes; porosity

Lay Summary (German)

Lead
Während der Gebirgsbildung ist das Freisetzen von Wassermolekülen von grosser Bedeutung. Es reduziert die Gesteinsfestigkeit, wodurch schichtsilikatreiche Gesteine als Gleitmittel bei der Gebirgsbildung fungieren. Andererseits wird freigesetztes Wasser während der Deformation erhöhten Porenfluiddrucken ausgesetzt, was sich in spontaner Spröddeformation äussert, wie sie bei Erdbeben auftritt. Vertiefte Erkenntnisse über die Rolle von fluiden Phasen sind aus diesem Grund von eminenter Bedeutung.
Lay summary

Inhalt und Ziele des Forschungsprojekts

Obwohl bekannt ist, dass bei erhöhtem Druck und Temperatur die H2O Moleküle freigesetzt werden, ist im Moment unklar, wieviel Wasser in welchen Zeiträumen, bei welchen Druck-/Temperaturbedingungen freigesetzt wird. Auch der Verlauf der Fliesspfade des Wasses und das Zusammenspiel mit der Deformation ist ungenügend erforscht.
Aus diesem Grund verfolgen wir in unserem Forschungsprojekt zwei Ansätze:
(1) Studien von natürlich deformierten schichtsilikatreichen Gesteinen Im Hinblick auf ihren Wasserverlusst und die damit assoziierten Fliesspfade. Dieser Projektteil basiert auf digitalen Feldkartierungen, Probennahmen gefolgt von mikrostrukturellen und geochemischen Analysen. Die Feldstudien werden in der Schweiz ausgeführt in Zusammenarbeit mit Kollegen der Universität Bern und Basel.
(2) Numerische Modellierungen aufgrund welcher das plastische Fliessverhalten bei unterschiedlichen Deformationsbedingungen eruiert werden soll. Basierend auf natürlichen Feldbeispielen soll das Deformationsmodel kalibriert werden, um in Zukunft Aussagen über das Fliessverhalten von schichtsilikatreichen Gesteinen machen zu können. Dieser Projektteil wird zusammen mit Kollegen aus Australien (UWA; ARRC) und der Universität Lausanne ausgeführt.

 

Wissenschaftlicher und gesellschaftlicher Kontext des Forschungsprojekts

Unsere Arbeit soll neue Erkenntnisse zur Rolle des Freisetzens von Wasser bei der Gebirgsbildung liefern. Dieses Wissen ist für verschiedene Bereiche von grosser Wichtigkeit, wie beispielsweise für ein besseres Verständnis der Erdbebenauslösemechanismen, dem Nutzen von Tiefengeothermie als wichtiger Energiequelle als auch dem sicheren Endlagern radioaktiver Abfälle in schichtsilikatreichen Gesteinen.

Direct link to Lay Summary Last update: 04.01.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Boudinage and folding as an energy instability in ductile deformation
Peters Max, Herwegh Marco, Paesold Martin K., Poulet Thomas, Regenauer-Lieb Klaus, Veveakis Manolis (2016), Boudinage and folding as an energy instability in ductile deformation, in JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 121(5), 3996-4013.
Strain localization in ductile rocks: A comparison of natural and simulated pinch-and-swell structures
Peters Max, Berger Alfons, Herwegh Marco, Regenauer-Lieb Klaus (2016), Strain localization in ductile rocks: A comparison of natural and simulated pinch-and-swell structures, in TECTONOPHYSICS, 680, 140-154.
The accretion of foreland basin sediments during early stages of continental collision in the European Alps and similarities to accretionary wedge tectonics
Dielforder Armin, Berger Alfons, Herwegh Marco (2016), The accretion of foreland basin sediments during early stages of continental collision in the European Alps and similarities to accretionary wedge tectonics, in Tectonics, 35, 1.
Boudinage as a material instability of elasto-visco-plastic rocks
Peters Max, Veveakis Manolis, Veveakis Manolis, Poulet Thomas, Poulet Thomas, Karrech Ali, Herwegh Marco, Regenauer-Lieb Klaus (2015), Boudinage as a material instability of elasto-visco-plastic rocks, in Journal of Structural Geology, 78, 86-102.
Linking megathrust earthquakes to brittle deformation in a fossil accretionary complex
Dielforder Armin, Vollstaedt Hauke, Vennemann Torsten, Berger Alfons, Herwegh Marco (2015), Linking megathrust earthquakes to brittle deformation in a fossil accretionary complex, in NATURE COMMUNICATIONS, 6, 1-10.

Collaboration

Group / person Country
Types of collaboration
Fachhochschule Winterthur, Dr. Lorenz Holzer Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
University of Western Australia, Prof. Klaus Regenauer-Lieb Australia (Oceania)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
Basel University, Dr. Josef Mullis Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Bern University, Dr. Urs Eggenberger Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
University of Lausanne, Prof. Dr. Stefan Schmalholz Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Ruhr University Bochum, Prof. F. Fusseis Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Museum d'Histoire Naturelle, PD Dr. Edwin Gnos Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
University of Lausanne, Prof. Thorsten Vennemann Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
SGM 2015 Talk given at a conference The accretion of foreland basin deposits and its effect on early orogenic processes: insights from the north-central Europan Alps, Switzerland 21.11.2015 Basel, Switzerland Dielforder Armin; Berger Alfons; Herwegh-Züger Marco;
SGM 2015 Talk given at a conference Boudinage and folding as the same energy bifurcation of elasto-visco-plastic rocks 21.11.2015 Basel, Switzerland Herwegh-Züger Marco; Peters Max;
The 10th workshop of the International Lithopshere Program, Tokyo (Japan) Talk given at a conference Linking megathrust earthquakes to brittle deformation and mineral vein formation in the paleoaccretionary complex of the central European Alps 05.10.2015 Tokyo, Japan Berger Alfons; Dielforder Armin; Herwegh-Züger Marco;
DRT 2015 Talk given at a conference Linking megathrust earthquakes to brittle deformation and mineral vein formation in the paleoaccretionary complex of the central European Alps 09.09.2015 Aachen, Germany Dielforder Armin; Herwegh-Züger Marco; Berger Alfons;
DRT 2015 Poster Unified energy theory for boudinage and folding of elasto-visco-plastic rocks 09.09.2015 Aachen, Germany Peters Max; Herwegh-Züger Marco;
DRT 2015 Talk given at a conference Microstructural evidence for the initiation of pinch-and-swell structures in ductile rocks 09.09.2015 Aachen, Germany Herwegh-Züger Marco; Peters Max;
EGU 2015 Poster Linking megathrust earthquakes to faulting and mineral vein formation in a fossil accretionary complex 13.04.2015 Wien, Austria Herwegh-Züger Marco; Dielforder Armin; Berger Alfons;
EGU 2015 Poster Generalization of the slip line theory for temperature sensitive visco-plastic materials 13.04.2015 Wien, Austria Peters Max;
EGU 2015 Talk given at a conference Material instabilities and their role for the initiation of boudinage and folding structures 13.04.2015 Wien, Austria Herwegh-Züger Marco; Peters Max;
EGU2015 Poster Deciphering the chronology of internal wedge deformation and pore fluid evolution by means of strontium isotopes of vein carbonates 13.04.2015 Wien, Austria Dielforder Armin; Herwegh-Züger Marco; Berger Alfons;
AGU 2014 Poster A record of brittle wedge internal deformation and its link to the subduction earthquake cycle 15.12.2014 San Francisco, United States of America Herwegh-Züger Marco; Berger Alfons; Dielforder Armin;
AGU 2014 Poster Folding and boudinage as the same fundamental energy bifurcation in elasto-visco-plastic rocks 15.12.2014 San Francisco, United States of America Herwegh-Züger Marco; Peters Max;
SGM 2014 Talk given at a conference Numerical bifurcation study of the initiation of folding and necking in elasto-visco-plastic rocks 22.11.2014 Fribourg, Switzerland Peters Max; Herwegh-Züger Marco;
SGM 2014 Talk given at a conference A chronology of internal wedge deformation constrained by strontium isotopes of carbonate veins 22.11.2014 Fribourg, Switzerland Dielforder Armin; Herwegh-Züger Marco; Berger Alfons;
GeoMod 2014 Poster Numerical bifurcation analysis of spontaneous strain localization resulting in necking of a layer 31.08.2014 Berlin, Germany Peters Max; Herwegh-Züger Marco;
EGU 2014 Poster Fluid flow and mineral vein formation during accretion of the Infrahelvetic flysch units, eastern Swiss Alps 28.04.2014 Wien, Austria Herwegh-Züger Marco; Berger Alfons; Dielforder Armin;
EGU 2014 Poster The effects of perturbations on the strain distribution in numerical simulations – elasto-viscoplastic modeling of boudinage as a case study 28.04.2014 Wien, Austria Peters Max; Herwegh-Züger Marco;
EGU 2014 Talk given at a conference Towards the determination of deformation rates – pinch-and-swell structures as a natural and simulated paleo-strain rate gage 28.04.2014 Wien, Austria Peters Max; Herwegh-Züger Marco;
EGU 2015 Talk given at a conference A fundamental discussion of what triggers localized deformation in geological materials. 14.04.2014 Wien, Austria Herwegh-Züger Marco; Peters Max;
TSK 2014 Talk given at a conference Fluid flow and mineral vein formation during orogenic accretion of the Infrahelvetic flysch units, eastern Swiss Alps 31.03.2014 Potsdam, Germany Dielforder Armin; Herwegh-Züger Marco; Berger Alfons;
SGM 2013 Poster Material softening as a potential cause for the development of boudinage – an elasto-visco-plastic numerical modeling approach 16.11.2013 Lausanne, Switzerland Peters Max; Herwegh-Züger Marco;
DRT 2013 Talk given at a conference What initiates necking? An approach to link natural microstructures with elasto-visco-plastic numerical modeling of boudinage 16.09.2013 Leuven, Belgium Herwegh-Züger Marco; Peters Max;


Awards

Title Year
Herr Armin Dielforder hat den Preis für die beste Doktorarbeit im Bereich Geowissenschaften der Phil.-nat. Fakultät der Universität Bern des Jahres 2016 erhalten. 2016
Herr Max Peters hat den Posterpreis der Konferenz DRT (Deformation, Rheology and Tectonics) erhalten, welche im September 2015 in Aachen stattfand. 2015

Associated projects

Number Title Start Funding scheme
149385 Structure and evolution of an antiformal nappe stack (Aar massif, Central Alps): Formation of mechanical anisotropies and their bearing on natural risks 01.10.2013 Project funding (Div. I-III)
132196 Structure and evolution of an antiformal nappe stack (Aar massif, Central Alps): Formation of mechanical anisotropies and their bearing on natural risks 01.10.2010 Project funding (Div. I-III)
162340 The role of sheet silicate-rich rocks during mountain building processes 01.01.2016 Project funding (Div. I-III)
169055 Structure and evolution of an antiformal nappe stack (Aar massif, Central Alps): Formation of mechanical anisotropies and their bearing on natural risks 01.10.2016 Project funding (Div. I-III)
150731 Laboratory multi-scale nano-CT scanner for 3D visualization and 4D experimentation in Earth and Material Sciences 01.05.2014 R'EQUIP

Abstract

Sheet silicate-rich lithologies are highly abundant in the Earth’s upper and middle crust. In a geodynamic context, they represent important rock types because (i) strain often is localized in these rocks due to their low rock strength at low to intermediate temperature conditions and (2) they serve as important fluid sources owing to water release with progressive recrystallization/ compaction/metamorphic reaction. Improved knowledge on the interplay between fluid release and deformation is rather crucial to better understand what the rheological effect on the formation and evolution of crustal scale deformation (fold and thrust tectonics, shear zones) is. In order to study the aforementioned interplay between deformation and fluid release over a temperature range, we will carry out an interdisciplinary research project in the field of structural geology, metamorphic petrology, rock mechanics and materials science. The project is based on a combination of quantitative fieldwork, quantitative microstructural and geochemical analytics and numerical modeling. The field areas will be situated in the Swiss Alps reaching from the Jura Mountains through the Helvetic Alps till the Penninic front allowing to gain information on changes in the interplay between deformation and fluid release over a temperature range from 80-450°C, i.e. metamorphic conditions of the upper to middle crust. The project is subdivided into the following three parts, each being treated by different persons of our research team:A)Quantitative investigation of the spatial distribution, 3D geometries and the evolution of fluid pathways within the temperature range 80-450°C in sheet silicate-rich rocks located near large-scale shear zones (PhD student A together with collaborators). This part is based on quantitative mapping of fluid pathways along N-S profiles combined with quantitative microstructural and geochemical analyses.B)The 3D quantification of the evolution in porosity and permeability as a function of strain, temperature and sheet silicate content (PhD Student B and PD Dr. A. Berger together with external collaborators). Mapping of key outcrops serves as a base for the quantification of 3D porosity evolution ranging from the submicron to the meter-scale on specific sample series using high-resolution analytical techniques (synchrotron tomography, FIB-FEG-SEM, computer tomography).C)Investigation of the rheology of sheet silicate-rich rocks in natural examples and their description via numerical models (PhD student C and Prof. M. Herwegh together with external collaborators). Numerical modeling approaches using natural strain and stress gages in order to investigate the rheological changes in sheet silicate bearing rocks and their fracturing behavior during fluid release.All three topics are closely related to each other requiring intense interaction and collaboration between the different members of the research team. In addition, the project will benefit from national as well as international collaborations for the different projects parts (e.g. University of Lausanne, Basel University; University of Western Australia). The suggested research project will have a broad impact in different disciplines of fundamental research as there are the localization of strain in sheet silicate-rich rocks, the effect of fluid release on permeability and deformation (fracturing, earthquake nucleation) as well as in applied problems (e.g. radioactive waste deposits, CO2 sequestration, shale gas and deep seated geothermal energy).
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