About
30
Publications
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846
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Citations since 2017
Introduction
My research focuses on the dynamics of the lithosphere at plate boundaries, with a principal purpose of understanding how feedback processes between rock deformation and fluid migration influence seismic and tectonic processes.
I am currently an Assistant Professor at the Institut de Physique du Globe de Paris (IPGP).
Additional affiliations
March 2017 - June 2020
September 2013 - January 2017
ISTerre, University of Grenoble, France
Position
- PhD Student
September 2013 - August 2016
Position
- Research Assistant
Description
- 3 years (192hours) of teaching for first to third year Bachelor’s degree students in: Geological mapping, Igneous petrology, Fieldwork, Structural geology, General geology, Sedimentology and Planetology.
Education
October 2013 - January 2017
September 2012 - August 2013
September 2009 - August 2010
Publications
Publications (30)
Understanding Earth’s interior dynamics, the origin and factors of which maintain the present-day plate-like behavior of the lithosphere on our planet, is one of the main goals of geosciences [...]
Transform faults accommodate the lateral motions between lithospheric plates, producing large earthquakes. Away from active transform boundaries, former oceanic transform faults also form the fracture zones that cover the ocean floor. However, the deep structure of these faults remains enigmatic. Here we present ultra-long offset seismic data from...
Oceanic transform faults that offset mid-ocean ridges slip through earthquakes and aseismic creep. The mode of slip varies with depth and along strike, with some fault patches that rupture in large, quasi-periodic earthquakes at temperatures <600 °C, and others that slip through creep and microearthquakes at temperatures up to 1,000 °C. Rocks from...
Alteration mineral assemblages in abyssal peridotites offer insights into the temperature and pressure conditions during hydrothermal fluid circulation in the oceanic lithosphere. Abundant hydrothermal vents have been observed along the ultraslow spreading Gakkel ridge and peridotites have been extensively sampled from the ridge, yet these peridoti...
Transform plate boundaries, one of the key elements of plate tectonics, accommodate lateral motions and produce large earthquakes, but their nature at depth remains enigmatic. Using ultra-long offset seismic data, here we report the presence of a low-velocity anomaly extending down to ~60 km depth beneath the Romanche transform fault in the equator...
This contribution investigates mechanisms controlling subduction development and stabilization over time (coined as 'slabitization'), from a nascent slab to a mature slab viscously coupled to mantle convection, from grain scale to plate tectonics scale. Frozen-in, deep and warm portions of the subduction plate interface with both sides still preser...
Water plays an important role in geological processes. Providing constraints on what may influence the distribution of aqueous fluids is thus crucial to understanding how H2O impacts Earth's geodynamics. In a deep-seated environment, viscous shear zones have been identified as sites of massive fluid circulation, with many implications for ores depo...
This study sheds light on the deformation mechanisms of subducted
mafic rocks metamorphosed at amphibolite and granulite facies conditions
and on their importance for strain accommodation and localization at the top
of the slab during subduction infancy. These rocks, namely metamorphic
soles, are oceanic slivers stripped from the downgoing slab and...
Hydrothermal alteration of abyssal peridotites occurs over a wide range of conditions (temperature, pressure, fluid composition). Despite the presence of secondary alteration phases in most seafloor samples, a systematic characterization of the extent of alteration and inventory of mineral phases has yet to be conducted. By examining the alteration...
The basal mantle of the Semail ophiolite directly overlying the metamorphic sole has been affected by a late and relatively low temperature ductile deformation event, ascribed to the deformation of the mantle just above the plate interface during subduction infancy (which ultimately led to ophiolite obduction). We show that this deformation results...
This study reports on feedback mechanisms between fluid migration, ductile deformation, and strain localization processes in an incipiently forming mantle wedge: the basal banded unit of the Semail ophiolite. These peridotites were located right above the plate interface during intraoceanic subduction infancy that ultimately led to ophiolite obduct...
The basal part of the Semail ophiolitic mantle was (de)formed at relatively low temperature (LT) directly above the plate interface during “nascent subduction” (the prelude to ophiolite obduction). This subduction-related LT deformation was associated with progressive strain localization and cooling, resulting in the formation of porphyroclastic to...
Experimental and geological-petrological studies suggest that the transition from brittle faulting to ductile flow of olivine, i.e. from seismic to aseismic behavior of mantle rocks (peridotites), occurs close to 600°C. However, recent seismological studies on oceanic transform faults (TFs) and ridges have documented earthquakes to temperatures (T)...
Water plays an important role in geological processes. Providing constraints on what may influence the distribution of aqueous fluids is thus crucial to understanding how water impacts Earth’s geodynamics. Here we demonstrate that ductile flow exerts a dynamic control on water-rich fluid circulation in mantle shear zones. Based on amphibole distrib...
Supplementary Figures, Supplementary Tables and Supplementary References
Les processus affectant le coin mantellique situé au-dessus d’une zone de subduction (déformation et interaction avec les fluides/liquides magmatiques libérés par la plaque inférieure) ont des implications importantes sur la dynamique de la subduction et le budget géochimique global de la Terre.Afin de mieux contraindre ces processus, ma thèse a po...
The juxtaposition of domains of shortening and extension at different scales in orogens has fueled many debates about driving forces and tectonic interpretations, including timing of deformation. At the orogen scale, gravitational collapse and mass transfer from orogenic plateaux to forelands explain some of these juxtapositions. At a regional scal...
Although the Oman ophiolite is classically regarded as being the direct analog of oceanic lithosphere created at fast spreading ridges, the geodynamic context of its formation is still highly debated. The other alternative end-member model suggests that this ophiolite entirely formed in a supra-subduction zone setting. The latter one is supported b...
Mantle viscous strain localization is often attributed to feedbacks between grain boundary sliding (GBS) and phase mixing, as GBS could promote mixing through grain switching, and phase mixing would enhance grain-size-sensitive granular flow through grain boundary pinning. However, although GBS and phase mixing are intimately related, recent data s...
Obduction corresponds to one of plate tectonics oddities, whereby fragments of dense, oceanic lithosphere (ophiolites) are presumably 'thrust' on top of light continental ones. Though reported from most convergent belts, the emplacement of ophiolites is still poorly understood. The thin HT metamorphic soles (i.e. 800 • C-1 GPa, on average) frequent...
PECUBE is a three-dimensional thermal–kinematic code capable of solving the heat production–diffusion–advection equation under a temporally varying surface boundary condition. It was initially developed to assess the effects of time-varying surface topography (relief) on low-temperature thermochronological datasets. Thermochronometric ages are pred...
Projects
Projects (4)
The Earth-like behavior of lithospheric plates requires strain to be localized at their interfaces, where large parts of the deforming rocks belong to the uppermost mantle. Strain localization into mantle shear zones is a first-order process that governs the displacement of plates from short (seismic) to long (tectonic) timescales. However, the mechanisms that drive mantle strain localization to occur and persist remain poorly understood. Therefore, this Special Issue will address new advances in the deformation of mantle minerals in shear zones dominated by viscous and/or semi-brittle flow. We invite researchers to provide high-quality articles on this topic with a particular emphasis on microstructures, seismic features, and/or rheological properties. Contributions about the role of fluids in mantle strain localization are also strongly encouraged.
Featured authors (so far): Greg Hirth, Haemyeong Jung and Julie Newman
Invited authors (so far): Yuval Boneh, Katsuyoshi Michibayashi, Jolien Linckens, Julien Gasc...
Submission Deadline: 15 April 2021
Submission Link: mdpi.com/si/60154
Flyer: https://drive.google.com/file/d/176V_8M1Y2xf67XTY2ZE860EuhRgNdkFy/view?usp=sharing
Studies of oceanic and continental fault zones have shown that fluid circulation has crucial implications for rock rheology and may drive weakening and seismic failure. In turn, deformation of rocks on fault/shear zones may trigger focusing of fluid flow through seismic pumping and ductile deformation. Peridotites are thought to transition from brittle failure (fault) to plastic flow (mylonite) at ~600°C. However, recent analysis of peridotite mylonites from oceanic fault zones has revealed the ubiquitous presence of hydrous mineral phases up to ~900°C.
This project focuses on fluid flow at plate interfaces and feedback processes between fluid percolation and deformation of mantle shear zones. In this project, peridotite mylonites are analyzed from shear zones in complementary settings, oceanic transform fault zones, the Ronda Peridotite massif and the Oman ophiolite. Methods used in this research include fieldwork, microstructural analysis, stable isotope measurements, and mineral thermometry. In addition, laboratory rock deformation experiments are used to investigate the behavior of fluid flow during deformation, the chemical environment in which water reacts to form hydrous minerals, and the influence these hydrous phases have in weakening mantle rocks and therefore localizing deformation.
This projects focuses on the petrological-geochemical-(micro)structural study of a fossil mantle wedge, the base of the Oman ophiolitic mantle. It aims at constraining processes of 1) fluid transfer from the subducting slab to the overlying mantle, 2) subsequent peridotite-fluid interaction and 3) feedbacks between fluid percolation, mantle ductile deformation mechanisms and strain localization, at a warm and young subduction zone interface.
