I am an ambitious and independent scientist. My research interests include the evolution of planetary interiors across the scales, and how it links to surface tectonics and volcanism. In particular, I aim at putting geophysical, geological, and cosmo-/geochemical observations in a physics-based framework using numerical modelling techniques. You can find more details on my several research projects below.
Towards a deep Earth recipe
The lower mantle is the largest geochemical reservoir in the Earth’s interior. It controls the style of mantle convection and, through it, the long-term evolution of our planet. Constraining the composition and structure of Earth’s lower mantle, however, remains a scientific challenge that requires cross-disciplinary efforts. In my PhD project, I search for the chemical and rheological recipe of Earth’s lower mantle through numerical models of long-term mantle convection and integration with constraints of the deep Earth from other disciplines.
Coupled dynamics of primordial and recycled heterogeneity in Earth's lower mantle
Topics of particular attention are the nature of chemical lower-mantle heterogeneity, how it has evolved over time, and how it has affected our planet’s evolution. I investigate the coupled dynamics and evolution of primordial domains and recycled material in numerical models of mantle convection. Primordial and recycled materials are robustly predicted to co-exist with each other. This study provides a new integration of independent hypotheses of present-day lower-mantle heterogeneity, which we link to geochemical and geophysical observations.
Following the above-mentioned study, I am investigating selected styles of mantle heterogeneity in 3D spherical geometry, and subsequently integrating the geodynamic models with seismic observations of Earth’s interior. This includes quantitatively comparing model results with seismic constraints.
Work in progress
Dynamic styles of primordial material preservation in Earth's interior
Cosmo- and geochemical constraints indicate that the lower mantle hosts an ancient primordial reservoir enriched in silica with respect to the upper mantle. Yet, geophysical observations and models point to efficient convective mixing across the entire mantle. In this study, I explore the effects of composition-dependent rheology on heterogeneity preservation and the dynamics of mantle mixing. Several regimes of primordial material preservation can occur in terrestrial planets. Some of these regimes are characterised for the first time and can reconcile the preservation of primordial domains in a convecting mantle, therefore relevant to Earth.
Geodynamic consequences of strain-weakening rheology of lower-mantle materials
Earth’s lower mantle’s main constituents are the strong mineral Bridgmanite (~80%) and the weaker Ferropericlase (~20%). The viscosity of such a multiphase rock depends on the modal abundance of weak versus strong minerals as well as the fabric of the rock. Using geodynamic models with a newly implemented strain-dependent rheology, we study the effect of strain-weakening rheology on global-scale mantle convection, in particular flow patterns and mantle plumes. We ultimately propose that weakened plumes could explain the long-known discrepancy between expected and observed thermal anomalies of deep-seated mantle plumes on Earth.
Venus tectonics and geodynamics
Our neighbouring planet Venus presents a clear contrast of tectonics with the Earth, despite similar interior structure and composition. Despite the absence of plate tectonics, its surface is littered with volcanic structures, rifts, and mountains. To what extent these surface features reflect the current state of the planet’s interior, remains in question. A better understanding of the dynamic interior processes at play, and how they link to the planet’s surface, is key for our understanding of the geological evolution of rocky planets (such as Earth), and even their habitability.
Corona structures provide unique insights into the present-day geological activity of Venus
Corona structures are large ring-shaped volcano-tectonic that may bear testimony of turbulent interior processes of Venus:
In this study, I systematically ran 3D computer models of plume-lithosphere interactions on Venus to assess the origin of coronaeand the reason behind their morphological differences. We found that different corona morphologies not only represent different dynamic styles of plume-lithosphere interactions, but also different stages in evolution. Therefore, corona structures related to ongoing plume-lithosphere interaction may be distinguished from fossil corona structures. Guided by these outcomes, we systematically investigated the topographic patterns of large coronae on the Venusian surface. We identified which structures are currently active and which are currently inactive. This assessment revealed broad regions of ongoing plume activity on the planet, presenting new evidence for widespread recent magmatic activity on the surface of Venus. The global distribution of this proposed tectono-magmatic activity sparks intriguing questions on Venusian deep interior circulation and dynamics.
Detachment faults and intra-oceanic subduction initiation
Extensional detachment faults, widely documented in slow-spreading and ultraslow-spreading ridges on Earth, can effectively localise deformation due to their weakness. After the onset of oceanic closure, these weak faults may control the nucleation of a subduction zone parallel to the former mid-ocean ridge. We conducted a series of 3D numerical experiments to investigate the formation of detachment faults in slow oceanic spreading systems and their subsequent response upon inversion from spreading to convergence. We define the controlling parameters for detachment fault formation, and show how these faults affect the dynamics of intra-oceanic subduction initiation.