Markus Ohl
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View article: Nanostructures as indicator for deformation dynamics
Nanostructures as indicator for deformation dynamics Open
We determine the feedback between fault dynamics and fault gouge structures by examining gouge structures that form during rupture and slip of initially intact granite under upper crustal conditions. Experiments were conducted under quasi-…
View article: “Lab‐Quakes”: Quantifying the Complete Energy Budget of High‐Pressure Laboratory Failure
“Lab‐Quakes”: Quantifying the Complete Energy Budget of High‐Pressure Laboratory Failure Open
Understanding the interplay of various energy sinks during seismic fault slip is essential for advancing earthquake physics and improving hazard assessment. However, quantifying the energy consumed by major dissipative processes remains a …
View article: Nanostructures as indicator for deformation dynamics
Nanostructures as indicator for deformation dynamics Open
We aim to determine the feedback between fault dynamics and fault gouge structures by examining gouge structures that formed during rupture and slip of initially intact granite under upper crustal conditions. Experiments were conducted und…
View article: Weaker than quartz? – Strain localization mechanisms and rheology of fine-grained polymineralic rocks
Weaker than quartz? – Strain localization mechanisms and rheology of fine-grained polymineralic rocks Open
The strength and deformation behaviour of the Earth are necessary parameters to model and fundamentally understand crustal scale deformation. In the case of the Earth’s continental middle crust, so far, most models use extrapolated p…
View article: Mechanisms of Aqueous Fluid Infiltration and Redistribution in a Lower‐Crustal Pseudotachylyte‐Bearing Fault
Mechanisms of Aqueous Fluid Infiltration and Redistribution in a Lower‐Crustal Pseudotachylyte‐Bearing Fault Open
Coseismic fracturing in the strong, dry, and metastable plagioclase‐rich lower‐crust is an effective mechanism for creating pathways for fluids to infiltrate the host rock, kick‐start metamorphism, and potentially lead to rheological weake…
View article: Dissolution-precipitation creep in polymineralic granitoid shear zones in experiments II: Rheological parameters
Dissolution-precipitation creep in polymineralic granitoid shear zones in experiments II: Rheological parameters Open
The transition from strong to weak mechanical behaviour in the Earth's continental middle crust is always caused by an initiation of viscous deformation. Microstructural evidence from field examples indicates that viscously deforming polym…
View article: Dissolution-precipitation creep in polymineralic granitoid shear zones in experiments I: Strain localization mechanisms
Dissolution-precipitation creep in polymineralic granitoid shear zones in experiments I: Strain localization mechanisms Open
Dissolution-precipitation creep (DPC) is considered as one of the main processes accommodating localized strain in polymineralic shear zones of the Earth’s crust. Extensive field evidence for DPC in natural shear zones supports the importa…
View article: Increasing control over biomineralization in conodont evolution
Increasing control over biomineralization in conodont evolution Open
Vertebrates use the phosphate mineral apatite in their skeletons, which allowed them to develop tissues such as enamel, characterized by an outstanding combination of hardness and elasticity. It has been hypothesized that the evolution of …
View article: Deformation and healing processes in the damage zone of a lower-crustal seismogenic fault
Deformation and healing processes in the damage zone of a lower-crustal seismogenic fault Open
In anhydrous, strong, and metastable lower-crustal rocks, coseismic fracturing is an effective mechanism for creating pathways for fluids to infiltrate and interact with the host rock, ultimately resulting in metamorphism and rheological w…
View article: Nanostructures as an indicator for deformation dynamics 
Nanostructures as an indicator for deformation dynamics  Open
Grain-size reduction – with amorphization or melting as its extreme forms – plays a crucial role in fault-zones dynamics, e.g., the nucleation or arrest of earthquakes. Previous experiments have been mostly conducted on powdere…
View article: The Role of Grain Boundaries in Low‐Temperature Plasticity of Olivine Revealed by Nanoindentation
The Role of Grain Boundaries in Low‐Temperature Plasticity of Olivine Revealed by Nanoindentation Open
The rheological properties of olivine influence large‐scale, long‐term deformation processes on rocky planets. Studies of the deformation of olivine at low temperatures and high stresses have emphasized the importance of a grain‐size effec…
View article: Multiscale solute transfer and porosity evolution during pervasive replacement of serpentine by carbonate and quartz - insights from the Oman ophiolite
Multiscale solute transfer and porosity evolution during pervasive replacement of serpentine by carbonate and quartz - insights from the Oman ophiolite Open
Pervasive carbonation of serpentinized peridotite to carbonate-quartz rock (listvenite) due to infiltration of CO2-bearing fluid is a remarkable process because it can be geologically fast and it increases the rock’s carbon content f…
View article: 3-D Reconstructions of Porous Media from 2-D input via Generative Adversarial Networks (GANs)
3-D Reconstructions of Porous Media from 2-D input via Generative Adversarial Networks (GANs) Open
Many macroscopic transport properties and physical processes, such as the flow of fluids through a porous medium, are directly controlled by its microstructure, specifically the presence and connectivity of individual pore spaces at micron…
View article: The Weakest Link – Revealing the microphysical deformation mechanisms of talc under P-T conditions associated with fault creep and slow slip events
The Weakest Link – Revealing the microphysical deformation mechanisms of talc under P-T conditions associated with fault creep and slow slip events Open
Talc is an important product of several hydration and dehydration reactions in deep faults and subduction zones. The unique weakness of talc along its basal planes makes it an essential component in understanding various fault slip behavio…
View article: Experimental constraints on the controlling mechanisms of tectonic tremors
Experimental constraints on the controlling mechanisms of tectonic tremors Open
Tectonic (or non-volcanic) tremors have been extensively documented at subduction zones and are considered as the signature of transport processes of dehydration-related fluids in subduction zones, often recorded in close association with …
View article: Deformation and healing processes in the damage zone of a lower-crustal seismogenic fault
Deformation and healing processes in the damage zone of a lower-crustal seismogenic fault Open
Coseismic fracturing of the lower crust is an effective mechanism for creating permeable pathways for fluids to infiltrate and interact with the host rock, thus effectively altering the rheology of otherwise anhydrous and strong lower-crus…
View article: The role of grain boundaries in low-temperature plasticity of olivine revealed by nanoindentation
The role of grain boundaries in low-temperature plasticity of olivine revealed by nanoindentation Open
The rheological properties of olivine influence large‐scale, long‐term deformation processes on rocky planets. Studies of the deformation of olivine at low temperatures and high stresses have emphasized the importance of a grain‐size effec…
View article: A New Method for Determining Fluid Flux at High Pressures Applied to the Dehydration of Serpentinites
A New Method for Determining Fluid Flux at High Pressures Applied to the Dehydration of Serpentinites Open
A new method to determine fluid flux at high pressures and temperatures has been developed and used to study serpentinites at subduction zone conditions. Drill cores of a natural antigorite‐serpentinite with a strong foliation were used in…
View article: Using Raman spectra of isotopically enriched transformation products to trace mineral reactions
Using Raman spectra of isotopically enriched transformation products to trace mineral reactions Open
<p>Isotopic doping is a powerful tool to identify newly formed mineral phases during fluid-mediated mineral transformation reactions. In particular, Raman spectroscopy of isotopically doped minerals can reveal incorporation of the is…
View article: Correlative, cross-platform microscopy application reveals deformation mechanisms during seismic slip along wet carbonate faults
Correlative, cross-platform microscopy application reveals deformation mechanisms during seismic slip along wet carbonate faults Open
<p>Faults in the upper crust are considered major fluid pathways, raising the need for deformation experiments under wet conditions that focus on the nanoscale interaction between gouge material and pore fluid. Friction experiments o…
View article: The role of grain boundaries in low-temperature plasticity of olivine revealed by nanoindentation
The role of grain boundaries in low-temperature plasticity of olivine revealed by nanoindentation Open
Nanoindentation, HR-EBSD and TEM data published in the manuscript titled The role of grain boundaries in low-temperature plasticity of olivine revealed by nanoindentation. The pre-print version of the manuscript can be found at: https://do…
View article: Mirror fault formation and coseismic slip at surface conditions: an example of faulting in unconsolidated deposits in the Central Apennines (Italy)
Mirror fault formation and coseismic slip at surface conditions: an example of faulting in unconsolidated deposits in the Central Apennines (Italy) Open
<p>Faulting in seismically active regions commonly involves the deformation of unconsolidated to poorly lithified sediments at shallow to near-surface depths. When compared to classic crustal strength profiles that predict a velocity…
View article: Nanomechanics of hydrous, seismogenic crustal faults
Nanomechanics of hydrous, seismogenic crustal faults Open
Earthquakes can affect rocks over large scales, ranging from kilometres down to nanometres. Fault damage often localises within a narrow zone of a few millimetres, the fault core, and studies published during recent years suggest that the …
View article: Crystal‐Plastic Deformation in Seismically Active Carbonate Fault Rocks
Crystal‐Plastic Deformation in Seismically Active Carbonate Fault Rocks Open
The spatial separation of macroscopic rheological behaviors has led to independent conceptual treatments of frictional failure, often referred to as brittle, and viscous deformation. Detailed microstructural investigations of naturally def…
View article: Crystal-plastic deformation in seismically active carbonate fault rocks
Crystal-plastic deformation in seismically active carbonate fault rocks Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Journal of Geophysical Research - Solid Earth. ESSOAr is a venue for early communication or feedback before peer review. Data may be pre…
View article: Crystal-plastic deformation of carbonate fault rocks through the seismic cycle
Crystal-plastic deformation of carbonate fault rocks through the seismic cycle Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Journal of Geophysical Research - Solid Earth. ESSOAr is a venue for early communication or feedback before peer review. Data may be pre…