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Mineralogical processes and rate of serpentinization at mid-ocean ridges - Experimental and numerical modelling of the couplings between reaction, deformation and fluid flow

English title Mineralogical processes and rate of serpentinization at mid-ocean ridges - Experimental and numerical modelling of the couplings between reaction, deformation and fluid flow
Applicant Malvoisin Benjamin
Number 168083
Funding scheme Ambizione
Research institution Institut des sciences de la Terre Université de Lausanne
Institution of higher education University of Lausanne - LA
Main discipline Geology
Start/End 01.09.2016 - 31.01.2020
Approved amount 535'564.00
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All Disciplines (2)

Discipline
Geology
Mineralogy

Keywords (9)

serpentinization; mass transfer; fluid/rock interactions; mid-ocean ridges; experimental petrology; hydrothermal circulation; kinetics; fluid pathways; numerical modelling

Lay Summary (French)

Lead
Au niveau des dorsales océaniques, lorsque les roches mantelliques exhumées sur le plancher océanique interagissent avec de l'eau de mer, une réaction dite de serpentinisation se produit. Cette réaction joue un rôle clef au niveau des dorsales puisqu'elle modifie les propriétés physico-chimiques de la lithosphère océanique. Elle présente aussi des intérêts économiques puisqu'il s'agit de la principale source d'hydrogène abiotique terrestre et que les roches mantelliques peuvent être utilisées pour le stockage du CO2. Bien que cette réaction présente de nombreux intérêts géologiques et économiques, la vitesse de cette réaction est encore très mal contrainte car les couplages entre de nombreux processus géologiques et minéralogiques doivent être pris en compte.
Lay summary

Contenu et objectifs du travail de recherche

Le principal objectif de ce projet est de quantifier l'impact des différents processus minéralogiques et de leurs couplages sur la vitesse de la serpentinisation. Pour ce faire, ce projet consiste à (i) utiliser des expériences hydrothermales innovantes pour reproduire les processus minéralogiques observés dans le milieu naturel, (ii) utiliser les résultats expérimentaux pour calibrer un modèle numérique considérant les couplages entre réaction, déformation et transport de fluide et (iii) utiliser le modèle numérique pour prédire l'influence de la serpentinisation à large échelle. La plateforme analytique de pointe disponible à l'Université de Lausanne permettra un suivi in-situ complet de l'évolution des différents paramètres physiques et chimiques lors de la réaction.

Contexte scientifique et social du projet de recherche

Ce projet fournira les premières contraintes quantitatives sur l'influence des couplages entre réaction, déformation et transport de fluide sur la vitesse de serpentinisation. Les résultats permettront de prédire l'impact de cette réaction sur l'évolution de la lithosphère océanique et le potentiel industriel de cette réaction pour la production d'hydrogène.

Direct link to Lay Summary Last update: 16.08.2016

Responsible applicant and co-applicants

Employees

Publications

Publication
Low Temperature Serpentinite Replacement by Carbonates during Seawater Influx in the Newfoundland Margin
Picazo Suzanne, Malvoisin Benjamin, Baumgartner Lukas, Bouvier Anne-Sophie (2020), Low Temperature Serpentinite Replacement by Carbonates during Seawater Influx in the Newfoundland Margin, in Minerals, 10(2), 184-184.
Deep hydrothermal activity driving the Lusi mud eruption
Malvoisin Benjamin, Mazzini Adriano, Miller Stephen A. (2018), Deep hydrothermal activity driving the Lusi mud eruption, in Earth and Planetary Science Letters, 497, 42-49.
Control of serpentinisation rate by reaction-induced cracking
Benjamin Malvoisin Nicolas Brantut Mary-Alix Kaczmarek (2017), Control of serpentinisation rate by reaction-induced cracking, in Earth and Planetary Science Letters, 476, 143-152.
Pore Fluid Extraction by Reactive Solitary Waves in 3-DReactive Porosity Waves
Omlin Samuel, Malvoisin Benjamin, Podladchikov Yury Y. (2017), Pore Fluid Extraction by Reactive Solitary Waves in 3-DReactive Porosity Waves, in Geophysical Research Letters, 44(18), 9267-9275.
Sustainable densification of the deep crust
MalvoisinBenjamin, AustrheimHaakon, HetényiGyörgy, ReynesJulien, HermannJoerg, BaumgartnerLukas, PodladchikovYuri, Sustainable densification of the deep crust, in Geology.

Datasets

Supplementary material for "Measurement of volume change and mass transfer during serpentinisation: insights from the Oman Drilling Project" (JGR Solid Earth)

Author Malvoisin, Benjamin
Persistent Identifier (PID) DOI: 10.5281/zenodo.3706790
Repository Zenodo
Abstract
The three supplementary files include one figure displaying the results of X-ray microtomography (File S1), two compilations of figures dealing with the volume change measurement (Files S2 and S3) and a table with the measured compositions in major and trace elements (Table S1).File S1 (Malvoisin_ds01.pdf). Result of X-ray microtomography. Olivine and Fe-brucite have a similar attenuation. The grains segmented by selecting this attenuation are displayed with a circle with a size proportional to the radius of a sphere of equivalent volume. The color of each circle depends on e, the aspect ratio (ratio of the length of the minimum and maximum axes of an ellipsoid fitted to each grain). The white arrow indicates the location of the main central vein. Grains near the main central vein have a lower e attributed to the platy habitus of Fe-brucite. The other grains are considered as olivine and used for the calculation of the extent of reaction.File S2 (Malvoisin_ds02.pdf). Optical photomicrographs used to calculate volume change during reaction (see main text for details about the calculation). Olivine grains (white) are surrounded by the serpentine + brucite mixture (light green to yellowish). The magnetite/clinopyroxene platelets are mapped in blue in olivine and in red in the serpentine + brucite mixture. The results of the model fitting the best the average orientation of the platelets in olivine are shown in green. The title of each photomicrograph provides the minimum and maximum estimates for volume change calculated with this model (see details about the calculation in the main text), and the size of the bottom right scale bar.File S3 (Malvoisin_ds03.pdf). Histograms of magnetite/clinopyroxene platelet orientation (in degree). Each histogram corresponds to a photomicrograph of File S1. The order of the histograms and the photomicrographs is the same. The orientations in the olivine grains, the serpentine + brucite mixture and for the model fitting the best the average orientation in olivine are displayed in blue, red and green, respectively. The title of the histograms provides the standard deviation of the platelet orientation in the olivine grains (STDoli), the serpentine + brucite mixture (STDori) and calculated with the model fitting the best the orientation in olivine (STDcal).Table S1 (Malvoisin_ds01.xlsx). Composition in major and trace elements measured with LA-ICPMS along five profiles perpendicular to the main vein. The composition as a function of the distance to the main vein is provided. The name of the tabs indicates if the profile was acquired in spot or in continuous mode (the two modes are described in the main text).

Collaboration

Group / person Country
Types of collaboration
Swiss Federal Institute of Technology Zürich Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
University of Lausanne Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
University of Oslo Norway (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Columbia University United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
Institut de Physique du Globe de Paris France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Earth Sciences/University College London Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
University of Bern 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
TIGER conference Talk given at a conference Fate of fluid pathways during reaction in a closed system: the example of serpentinization 11.09.2019 Perth, Australia Malvoisin Benjamin;
Seminar PGP Individual talk Serpentine veins: Frankenstein and turtle patterns development in the samples from the Oman Drilling Project 06.09.2019 Physics of Geological Processes laboratory, Norway Malvoisin Benjamin;
European Geosciences Union Assembly Talk given at a conference Self-sustained eclogitisation of the deep crust 07.04.2019 Vienne, Austria Malvoisin Benjamin;
European Geosciences Union General Assembly Poster Reaction at a lithological interface in Alpine Corsica: oxygen fugacity gradient or fluid overpressure? 08.04.2018 Vienne, Austria Malvoisin Benjamin;
European Geosciences Union General Assembly Poster Deciphering the link between eclogitization of granulite and deep crustal earthquakes 08.04.2018 Vienne, Austria Malvoisin Benjamin;
European Geosciences Union General Assembly Talk given at a conference Fluid extraction from subduction zones by reacting porosity waves 08.04.2018 Vienne, Austria Malvoisin Benjamin;
European Geosciences Union General Assembly Talk given at a conference Role of reaction kinetics for replacement under differential stresses 08.04.2018 Vienne, Austria Malvoisin Benjamin;
American Geophysical Union General Assembly Poster Influence of reaction-induced fracturing on serpentinisation rate 11.12.2017 Nouvelle-Orléans, United States of America Malvoisin Benjamin;
Séminaires laboratoire ISTerre Individual talk Des veines métamorphiques à la migration des tremors en zone de subduction : apport et limites d’une nouvelle génération de modèles de transport réactif 04.12.2017 Grenoble, France Malvoisin Benjamin;
Journées Lémaniques Talk given at a conference Reacting porosity waves: a new mechanism for fluid flow in subduction zones 09.11.2017 Genève, Switzerland Malvoisin Benjamin;
Geobremen 2017 Talk given at a conference Reaction-induced fluide flow during metamorphism 25.09.2017 Bremen, Germany Malvoisin Benjamin;
Interplay between reaction and deformation Talk given at a conference Modelling fluid flow and deformation during (de-)volatilization reactions 05.09.2017 Zürich, Switzerland Malvoisin Benjamin;
European Geosciences Union General Assembly Talk given at a conference Modelling transient fluid trap and release by metamorphic reactions: implications for fluid flow in subduction zones 27.04.2017 Vienna, Austria Malvoisin Benjamin;
European Geosciences Union General Assembly Poster Does serpentinite carbonation occur during recharge or discharge of hydrothermal fluids? A case of study from the Newfoundland margin 26.04.2017 Vienna, Austria Malvoisin Benjamin;
European Geosciences Union General Assembly Talk given at a conference Numerical Modeling for Large Scale Hydrothermal System 25.04.2017 Vienna, Austria Malvoisin Benjamin;
Swiss Geoscience Meeting Talk given at a conference Role of metamorphic reactions on deformation and fluid flow: a new fully-coupled model 19.11.2016 Geneva, Switzerland Malvoisin Benjamin;
Grands séminaires Individual talk Modélisations multi-échelles de l'impact des réactions métamorphiques sur la déformation et le transport de fluide 14.11.2016 Grenoble, France Malvoisin Benjamin;


Abstract

Mantle rocks (peridotites) exhumed along large faults at slow-spreading ridges react with seawater, through hydrothermal circulation to form hydrated minerals of the serpentine group (serpentinization). This reaction strongly modifies the chemical and physical properties of the lithosphere and thus plays a key role on the geodynamics of mid-ocean ridges. Laboratory experiments on powders indicate that serpentinization should reach completion in several years, while samples recovered at mid-ocean ridges are generally incompletely serpentinized after more than tens of thousands years of seawater exposure. Explaining this discrepancy remains a challenge because it requires modelling the complex (and coupled) processes of reaction, fluid transport and deformation during serpentinization. This project aims at studying these couplings to quantify the rate of the reaction, and to model the consequences of serpentinization on fluid flow at mid-ocean ridges. An integrated approach combining innovative experiments, new numerical models and cutting-edge analytical techniques will be used at the University of Lausanne (Institute of Earth Sciences). Hydrothermal experiments will be conducted to set up a numerical model coupling reaction, fluid flow and deformation. The expected results of this project will be useful not only for academic research through better modelling of the physical and chemical changes occurring in the oceanic lithosphere but also for society with a better assessment of abiotic hydrogen production at mid-ocean ridges and CO2 sequestration capacities in peridotites. Moreover, the experimental and numerical developments performed during this project can serve as a basis for modelling other reactions in geological environments where the couplings between reaction, fluid flow and deformation play a key role. The strong national and international collaborations proposed in this project will also contribute to the high visibility of the results within the Geoscience community.
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