Anna J. P. Gülcher

Anna J. P. Gülcher
ETH Zurich | ETH Zürich · Institute of Geophysics

PhD student in Geophysics at ETH Zürich

About

22
Publications
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Introduction
Anna is drawn to interior processes of the Earth and other planets, and uses numerical modelling tools to study these processes. In particular, she is interested in putting geophysical, geological and geochemical observations in a geodynamically coherent framework. She works on lithosphere dynamics on Venus and more recently on the effect of compositional and rheological heterogeneities on mantle mixing and convection in terrestrial planets.
Additional affiliations
November 2018 - February 2020
ETH Zurich
Position
  • PhD Student

Publications

Publications (22)
Article
Full-text available
The evolution of the system Earth is critically influenced by the long-term dynamics, composition and structure of the mantle. While cosmochemical and geochemical constraints indicate that the lower mantle hosts an ancient primordial reservoir that may be enriched in SiO2 with respect to the upper mantle, geophysical observations and models point t...
Article
Full-text available
In the absence of global plate tectonics, mantle convection and plume-lithosphere interaction are the main drivers of surface deformation on Venus. Among documented tectonic structures, circular volcano-tectonic features known as coronae may be the clearest surface manifestations of mantle plumes and hold clues to the global Venusian tectonic regim...
Article
Full-text available
Extensional detachment faults, which have been widely documented in slow-spreading and ultraslow-spreading ridges on Earth, can effectively localize deformation due to their weakness. After the onset of oceanic closure, these weak oceanic detachments may directly control the nucleation of a subduction zone parallel to the former mid-ocean ridge, as...
Article
Full-text available
The nature of compositional heterogeneity in Earth's lower mantle remains a long-standing puzzle that can inform about the long-term thermochemical evolution and dynamics of our planet. Here, we use global-scale 2D models of thermochemical mantle convection to investigate the coupled evolution and mixing of (intrinsically dense) recycled and (intri...
Preprint
Full-text available
The nature of compositional heterogeneity in Earth’s lower mantle remains a long-standing puzzle that can inform about the long-term thermochemical evolution and dynamics of our planet. Here, we use global-scale 2D models of thermochemical mantle convection to investigate the coupled evolution and mixing of (intrinsically-dense) recycled and (intri...
Preprint
Full-text available
The nature of compositional heterogeneity in Earth’s lower mantle remains a long-standing puzzle that can inform about the long-term thermochemical evolution and dynamics of our planet. Here, we use global-scale 2D models of thermo- chemical mantle convection to investigate the coupled evolution and mixing of (intrinsically-dense) recycled and (int...
Article
Full-text available
Venus Corona and Tessera Explorer (VeCaTEx) would use an aerobot to descend repeatedly beneath the dense clouds for imaging targeted area of the surface in the near infrared to address six of the prime investigations prioritized by VEXAG. The technologies needed could be matured during the next decade.
Article
Full-text available
{lay summary} The surface of Venus is littered with ring-shaped structures called “coronae”, whose formation is often linked to tectonic and volcanic activity in the past. Yet, using computer simulations that mimic their formation, we show how these structures provide unique insights into the present-day dynamics of Venus’ interior. We identify do...
Conference Paper
Full-text available
The nature of compositional heterogeneity in Earth's lower mantle is a long-standing puzzle that can inform about the long-term thermochemical evolution and dynamics of our planet. On relatively small scales (<1km), the concept of a "marble cake" mantle has gained wide acceptance, emphasizing that streaks of recycled oceanic crust (ROC) and lithosp...
Conference Paper
Full-text available
Rocks in the Earth's interior consist of different mineralogical phases with different rheological properties. In Earth's lower mantle, the main rock constituents are bridgmanite (Br) and smaller amounts of ferropericlase (Fp). Bridgmanite is substantially stronger than ferropericlase, and lower mantle rheology may be highly dependent on the relati...
Conference Paper
Despite stirring by vigorous convection over billions of years, the Earth’s lower mantle appears to be heterogeneous on various length scales. On scales <1km, the concept of a “marble cake” mantle has gained wide acceptance, emphasizing that streaks of recycled oceanic crust (ROC) and lithosphere make up much of the mantle. On larger scales (10s-10...
Preprint
In the absence of global plate tectonics, mantle convection and plume-lithosphere interaction are the main drivers of surface deformation on Venus. Among documented tectonic structures, circular volcano-tectonic features known as coronae may be the clearest surface manifestations of mantle plumes and hold clues to the global Venusian tectonic regim...
Conference Paper
Full-text available
Rocks in the Earth's interior are not homogeneous but consist of different mineralogical phases with different rheological properties. Deformation of heterogeneous rocks is thus also heterogeneous, and strongly depends on the rheological contrasts and spatial distribution of the mineral phases. In Earth's lower mantle, the main rock constituents ar...
Preprint
The evolution of the system Earth is critically influenced by the long-term dynamics, composition and structure of the mantle. While cosmochemical and geochemical constraints indicate that the lower mantle hosts an ancient primordial reservoir that may be enriched in SiO2 with respect to the upper mantle, geophysical observations and models point t...
Preprint
Extensional detachment faults, which have been widely documented in slow-spreading and ultraslow-spreading ridges on Earth, can effectively localize deformation due to their weakness. After the onset of oceanic closure, these weak oceanic detachments may directly control the nucleation of a subduction zone parallel to the former mid-ocean ridge, as...
Conference Paper
Full-text available
With the absence of global plate tectonics, mantle plumes and related gravitational potential variations are generally thought to be driving Venusian tectonics. The ~circular volcano-tectonic corona structures are perhaps the most profound surface manifestations of these mantle plume upwellings, yet their origin remains enigmatic and possibly non-u...

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Projects

Projects (4)
Project
We study fabric-dependent rheology in the context of long-term global-scale models of mantle convection. In particular, a macro-scale description of strain-dependent weakening based on micro-scale physics is implemented into a global mantle convection code. We investigate how strain-weakening rheology influences global mantle convective patterns and tectonics.
Project
The overall goal of this project is to investigate the preservation of primordial heterogeneity in the Earth’s mantle while studying the effects of compositional rheology on mantle dynamics. Although recent advances in mantle convection paradigms and modelling approaches bring us closer to an integrated convection model that is consistent with both geochemical and geophysical constraints, they also spark questions about the Earth’s bulk silica composition and thermochemical evolution over geological time. Questions that we aim to answer in this project are: can deep bridgmanitic and/or iron-rich mantle domains be formed and maintained by present day tectonic processes and apparent whole-mantle convection? Are they leftovers from fractionation in an ancient magma ocean [as proposed by Ballmer et al., 2017]? To address these questions, recent discoveries from seismology, geochemistry and mineral physics have to be integrated into a geodynamic coherent framework. This requires multi-disciplinary approaches and interaction between various disciplines within Deep Earth studies.
Project
Using high-resolution 3D numerical models, the projact aims to investigate: -the formation of (detachment) faults at slow-spreading mid-ocean ridges - the effect of these faulting patterns upon intra-oceanic subduction initiation whan far-field compressional forces are applied.