A5053707025- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Seismic Imaging and Inversion Techniques
- Rock Mechanics and Modeling
- Hydrocarbon exploration and reservoir analysis
- CO2 Sequestration and Geologic Interactions
- Geochemistry and Geologic Mapping
- Hydraulic Fracturing and Reservoir Analysis
- Geological formations and processes
- Geological and Geophysical Studies
- Methane Hydrates and Related Phenomena
- Drilling and Well Engineering
- Geophysical and Geoelectrical Methods
- Mineral Processing and Grinding
- Geotechnical and Geomechanical Engineering
- Seismic Waves and Analysis
- Groundwater flow and contamination studies
- Landslides and related hazards
- Geology and Paleoclimatology Research
- Elasticity and Material Modeling
- Planetary Science and Exploration
- Advanced X-ray Imaging Techniques
- Granular flow and fluidized beds
- Soil and Unsaturated Flow
Queensland University of Technology
2015-2024
UNSW Sydney
2019-2021
Environmental Earth Sciences
2015-2019
The University of Western Australia
2010-2017
University of Toronto
2006-2009
Freie Universität Berlin
2008
In-situ chemical analysis on thin sections is a cornerstone of geochemical research. Despite massive advances in digital image analysis, the interpretation such data within optical petrological context section has largely remained an analogue task geochemistry. In this contribution, we registered and micro-chemical images from large areas. Chemical datasets scanning electron microscopy energy dispersive spectrometry (SEM-EDX) Synchrotron X-ray fluorescence (S-XFM) were exported proprietary...
Abstract. We conducted an in-situ X-ray micro-computed tomography heating experiment at the Advanced Photon Source (USA) to dehydrate unconfined 2.3 mm diameter cylinder of Volterra Gypsum. used a purpose-built transparent furnace heat sample 388 K for total 310 min acquire three-dimensional time-series dataset comprising nine time steps. The voxel size 2.2 μm3 proved sufficient pinpoint reaction initiation and organization drainage architecture in space time. observed that dehydration...
Measuring Earth material behaviour on time scales of millions years transcends our current capability in the laboratory.We review an alternative path considering multiscale and multiphysics approaches with quantitative structure-property relationships.This approach allows a sound basis to incorporate physical principles such as chemistry, thermodynamics, diffusion geometry-energy relations into simulations data assimilation vast range length encountered Earth.We identify key for systems...
A new method is introduced for quantifying the scale and intensity of strain localization from maps natural shear zones. The employs autocorrelation functions to determine local areal scales geometric homogeneity. These homogenization are used calculate scale‐dependent fractions deformed rock. quantified measurements mean relative maximum strain. This approach analyze zones on different an exposure (Cap de Creus, Spain) fossil brittle‐to‐viscous transition (BVT). Changes in scaling...
Geoscientists are confronted with the challenge of assessing nonlinear phenomena that result from multiphysics coupling across multiple scales quantum level to scale earth and femtosecond 4.5 Ga history our planet.We neglect in this review electromagnetic modelling processes Earth's core, focus on four types couplings underpin fundamental instabilities Earth.These thermal (T), hydraulic (H), mechanical (M) chemical (C) which driven controlled by transfer heat surface.Instabilities appear as...
This paper reports on the development of an open-source image analysis software 'pipeline' dedicated to petrographic microscopy. Using conventional rock thin sections and images from a standard polarising microscope, pipeline can classify minerals subgrains into objects obtain information about optic-axis orientation. Five metamorphic rocks were chosen test illustrate method. Thin imaged using reflected cross- plane-polarised transmitted light. Images taken at different angles polariser...
During the interseismic phase, faults regain frictional strength through a process commonly referred to as fault healing. Key mechanisms include contact welding by dissolution-precipitation creep and cementation mineral precipitation in fluid-rich environments. While much research has focused on experimental investigations of silicate systems, e.g. slide-hold-slide experiments, complex interaction between mechanical chemical processes, well recurring healing over multiple earthquake cycles...
Petrological and geochemical evidence demonstrates that mylonitic ductile shear zones transport significant amounts of fluids through the lithosphere. Because lack percolating pore networks in exhumed rocks, it has been hypothesised most fluid pathways consist transient pores with micro- to nanoscale aperture. These typically include grain boundaries, creep cavities, due mineral reactions, all which open close cyclically during plastic deformation. However, is not known how much each these...
Mylonitic shear zones funnel significant amounts of fluids through the crust. However, physical mechanisms and pathways for mass transfer remain debated. Grain boundaries, creep cavities, pores formed by mineral reactions involving volume change transport are considered most important fluid conduits. So far, imaging these was either limited to µm-resolution, or in case nm-scale resolution, very small areas (e.g., TEM investigates regions µm2-range) with statistical power....
Late-stage Ca-sulfate–filled fractures are common on Mars. Notably, the Shenandoah formation in western edge of Jezero crater preserves a variety Ca-sulfate minerals fine-grained siliciclastic rocks explored by Perseverance rover. However, depositional environment and timing these sulfates unknown. To address this outstanding problem, we developed technique to map crystal orientations situ at two stratigraphically similar locations formation, allowing us constrain burial depth...
Abstract. Image correlation techniques have provided new ways to analyse the distribution of deformation in analogue models tectonics space and time. Here, we demonstrate, using a version our software package (TecPIV), how successive time-lapse images deforming model allows not only evaluate components strain-rate tensor at any time but also calculate finite displacements strain tensor. We illustrate with synthetic algorithm produces maps velocity gradients, small-strain components,...
White mica has been widely used to date microstructures and tectonic events in faults, shear-zones folds because of its suitability for radiogenic dating. However, complex (i) microstructural evolution, (ii) individual chemical evolution the K-bearing phases, (iii) mixing 'detrital grains' with newly formed and/or recrystallized or chemically reset grains as well (iv) volume diffusion may result apparent K-Ar ages. Here, specimens from a prograde sediment sequence exhumed fossil European...
SUMMARY Patterns in nature are often interpreted as a product of reaction-diffusion processes which result dissipative structures. Thermodynamic constraints allow prediction the final state but dynamic evolution microprocesses is hidden. We introduce new microphysics-based approach that couples microscale cross-constituent interactions to large-scale behaviour, leads discovery family soliton-like excitation waves. These waves can appear hydromechanically coupled porous media reaction...
Abstract. We propose a multiscale approach for coupling multi-physics processes across the scales. The physics is based on discrete phenomena, triggered by local thermo-hydro-mechano-chemical (THMC) instabilities, that cause cross-diffusion (quasi-soliton) acceleration waves. These waves nucleate when overall stress field incompatible with accelerations from feedbacks of generalized THMC thermodynamic forces trigger fluxes another kind. Cross-diffusion terms in 4×4 diffusion matrix are shown...
Heating or cooling can lead to high stresses in rocks due the different thermal‐elastic properties of minerals. In upper 4 km crust, such internal might cause fracturing. Yet it is unclear if thermal elasticity contributes significantly critical and failure deeper Earth's continental where ductile creep causes stress relaxation. We combined a heating experiment conducted Synchrotron microtomograph (Advanced Photon Source, USA) with numerical simulations calculate grain‐scale field granite...