Alexandra Kushnir
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View article: Influence of cristobalite and diktytaxitic textures on the physical properties of submarine rhyolite lavas from Havre volcano (Kermadec volcanic arc, Pacific Ocean)
Influence of cristobalite and diktytaxitic textures on the physical properties of submarine rhyolite lavas from Havre volcano (Kermadec volcanic arc, Pacific Ocean) Open
The syn-eruptive alteration of lavas can influence their physical, mechanical, and hydraulic properties, with implications for the outgassing of magmatic volatiles and the stability of volcanic structures. Although glass corrosion, resulti…
View article: Time-Dependent Deformation of Sandstone due to Chemical Corrosion: An Investigation Using the Heterogeneous Grain-Based Phase-Field Method
Time-Dependent Deformation of Sandstone due to Chemical Corrosion: An Investigation Using the Heterogeneous Grain-Based Phase-Field Method Open
View article: Imaging Shallow Gas Pockets and Hydrothermal Alteration at the Summit of an Active Volcano
Imaging Shallow Gas Pockets and Hydrothermal Alteration at the Summit of an Active Volcano Open
View article: Compaction and Permeability Evolution of Tuffs From Krafla Volcano (Iceland)
Compaction and Permeability Evolution of Tuffs From Krafla Volcano (Iceland) Open
Pressure and stress perturbations associated with volcanic activity and geothermal production can modify the porosity and permeability of volcanic rock, influencing hydrothermal convection, the distribution of pore fluids and pressures, an…
View article: An adaptive phase field approach to 3D internal crack growth in rocks
An adaptive phase field approach to 3D internal crack growth in rocks Open
View article: Imaging hydrothermal alteration with electrical resistivity tomography in La Soufrière de Guadeloupe volcano
Imaging hydrothermal alteration with electrical resistivity tomography in La Soufrière de Guadeloupe volcano Open
Hydrothermal alteration plays a major role in volcanic instability. Improving techniques that allow us to better understand the timescales of alteration in active volcanoes is thus paramount. Since the reactivation of the fumarolic field a…
View article: ReSiDue: A coupled rock physics and geochemical approach to understanding how rock-fluid interactions change permeability in volcanic systems
ReSiDue: A coupled rock physics and geochemical approach to understanding how rock-fluid interactions change permeability in volcanic systems Open
Reactions between aqueous fluids and rocks result in secondary mineral formation – alteration – that can block permeable pathways in the Earth’s crust and change the hydraulic properties of geological systems. The propens…
View article: Reactivation of variably sealed joints and permeability enhancement in geothermal reservoir rocks
Reactivation of variably sealed joints and permeability enhancement in geothermal reservoir rocks Open
Hydraulic stimulation of enhanced deep geothermal reservoirs commonly targets pre-existing joint networks with the goal of increasing reservoir permeability. Here, we study the permeability and strength of joint-free and jointed Buntsandst…
View article: Reactivating sealed joints: rock strength reduction and permeability enhancement … sometimes
Reactivating sealed joints: rock strength reduction and permeability enhancement … sometimes Open
Rock masses are often criss-crossed by generations of discontinuities, including veins, fractures, and joints. The presence of fractures and joints can increase rock mass permeability and decrease rock mass strength. However, fluid flow wi…
View article: Permeability, alteration, and microstructure: A (hopefully) coupled rock physics and geochemical approach to how rock-fluid interactions change permeability
Permeability, alteration, and microstructure: A (hopefully) coupled rock physics and geochemical approach to how rock-fluid interactions change permeability Open
Permeability is a key physical property across all spatial scales in the Earth’s crust and exerts significant control on the behaviour of Earth systems, with implications for natural hazards (e.g., earthquakes, slope instabilities, v…
View article: Data for Heap et al. (JGR: Solid Earth)
Data for Heap et al. (JGR: Solid Earth) Open
Excel spreadsheet containing the mechanical and permeability data for "Compaction and permeability evolution of tuff from Krafla volcano (Iceland)" by Heap et al. (JGR: Solid Earth).
View article: Influence of water on deformation and failure of gypsum rock
Influence of water on deformation and failure of gypsum rock Open
View article: Enrichment of immobile elements in synmagmatic fractures
Enrichment of immobile elements in synmagmatic fractures Open
<p>Useful minerals containing rare Earth elements (REE) and metals are sourced from magma bodies, but exactly how these elements initially leave the magma is not well known. Here we present textural and chemical analyses of mineral-f…
View article: The thermal properties of hydrothermally altered andesites from La Soufrière de Guadeloupe (Eastern Caribbean)
The thermal properties of hydrothermally altered andesites from La Soufrière de Guadeloupe (Eastern Caribbean) Open
View article: Publishing a Special Issue of Reports from the volcano observatories in Latin America
Publishing a Special Issue of Reports from the volcano observatories in Latin America Open
Peer-reviewed publications are the most common way of sharing scientific knowledge internationally. Volcanica is the only fully diamond open access journal in volcanology, publishing peer-reviewed articles without costs to authors or reade…
View article: The force required to operate the plunger on a French press
The force required to operate the plunger on a French press Open
The French press is a popular device for brewing coffee, comprising a cylindrical beaker—or “jug”—fitted with a lid and plunger with a fine wire mesh filter. The plunger is used to drive the solid coffee particles to the bottom of the jug,…
View article: Growing a diamond open access community initiative: Volcanica 3 years on
Growing a diamond open access community initiative: Volcanica 3 years on Open
<p>The case for open access research is well established. At the core of the pro-openness argument is a philosophy that it is good if research outputs are widely accessible, breaking down the walls that stand between the world of res…
View article: Strength and permeability evolution of andesite during benchtop acid dissolution experiments: implications for volcanic systems
Strength and permeability evolution of andesite during benchtop acid dissolution experiments: implications for volcanic systems Open
<p>Acidic crater lakes are common features of subaerial volcanic systems; indeed, research suggests the existence of over 700 volcanic lakes around the world. Their persistence requires a regular input of water (e.g., meteoric water)…
View article: Experimental Constraints on the Crystallization of Silica Phases in Silicic Magmas
Experimental Constraints on the Crystallization of Silica Phases in Silicic Magmas Open
Low-pressure silica polymorphs, e.g. quartz (Qtz), tridymite (Trd), and cristobalite (Crs), are common in silicic magmas, but the conditions of their formation are still unclear. The stability fields of these polymorphs have been determine…
View article: The fire resistance of high-strength concrete containing natural zeolites
The fire resistance of high-strength concrete containing natural zeolites Open
View article: A model for permeability evolution during volcanic welding
A model for permeability evolution during volcanic welding Open
View article: From exploration to operation: research developments in deep geothermal energy
From exploration to operation: research developments in deep geothermal energy Open
International audience
View article: The thermal properties of porous andesite
The thermal properties of porous andesite Open
The thermal properties of volcanic rocks are crucial to accurately model heat transfer in volcanoes and in geothermal systems located within volcanic deposits. Here we provide laboratory measurements of thermal conductivity and thermal dif…
View article: Physical property evolution of granite during experimental chemical stimulation
Physical property evolution of granite during experimental chemical stimulation Open
The Soultz-sous-Forêts geothermal reservoir (France)—in particular, the GPK-4 well—has been proposed as a target for chemical stimulation under the DESTRESS Horizon-2020 framework. With a combination of batch reaction tests and acid flow-t…
View article: Fracture reactivation for permeability enhancement in geothermal systems
Fracture reactivation for permeability enhancement in geothermal systems Open
<p>While the deep granitic basement in the Upper Rhine Graben is currently being exploited as a geothermal reservoir at numerous geothermal sites, the Permo-Triassic sandstones that lie directly above the granite are critical to cont…
View article: Heat flow density estimates in the Upper Rhine Graben using laboratory measurements of thermal conductivity on sedimentary rocks
Heat flow density estimates in the Upper Rhine Graben using laboratory measurements of thermal conductivity on sedimentary rocks Open
The Upper Rhine Graben (URG) has been extensively studied for geothermal exploitation over the past decades. Yet, the thermal conductivity of the sedimentary cover is still poorly constrained, limiting our ability to provide robust heat fl…
View article: Hydrothermal alteration of andesitic lava domes can lead to explosive volcanic behaviour
Hydrothermal alteration of andesitic lava domes can lead to explosive volcanic behaviour Open
View article: An Analogue Approach to Characterize the Basement-Sediment Transition Zone as a Geothermal Reservoir
An Analogue Approach to Characterize the Basement-Sediment Transition Zone as a Geothermal Reservoir Open
International audience
View article: Petrophysical properties of the Muschelkalk from the Soultz-sous-Forêts geothermal site (France), an important lithostratigraphic unit for geothermal exploitation in the Upper Rhine Graben
Petrophysical properties of the Muschelkalk from the Soultz-sous-Forêts geothermal site (France), an important lithostratigraphic unit for geothermal exploitation in the Upper Rhine Graben Open
The Muschelkalk, composed of Triassic limestones, marls, dolomites, and evaporites, forms part of the Permo-Triassic cover of sedimentary rocks that directly overlies the fractured granitic reservoir used for geothermal energy exploitation…
View article: Strain‐Dependent Rheology of Silicate Melt Foams: Importance for Outgassing of Silicic Lavas
Strain‐Dependent Rheology of Silicate Melt Foams: Importance for Outgassing of Silicic Lavas Open
Outgassing of volcanic systems is a ubiquitous phenomenon. Yet the mechanisms facilitating gas escape from vesiculating magmas and lavas remain poorly understood. Pervasive outgassing is thought to depend on the efficient and abundant form…