A5065165813- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Glass properties and applications
- earthquake and tectonic studies
- Material Dynamics and Properties
- Geology and Paleoclimatology Research
- Mineralogy and Gemology Studies
- Hydrocarbon exploration and reservoir analysis
- Building materials and conservation
- X-ray Diffraction in Crystallography
- Geochemistry and Geologic Mapping
- Crystallization and Solubility Studies
- Nuclear Physics and Applications
- Geomagnetism and Paleomagnetism Studies
- Planetary Science and Exploration
- Landslides and related hazards
- Geological formations and processes
- Clay minerals and soil interactions
- Rheology and Fluid Dynamics Studies
- CO2 Sequestration and Geologic Interactions
- Metallurgical Processes and Thermodynamics
- Cultural Heritage Materials Analysis
- Boron and Carbon Nanomaterials Research
- Rock Mechanics and Modeling
- Methane Hydrates and Related Phenomena
Ludwig-Maximilians-Universität München
2016-2025
LMU Klinikum
2023
Durham University
2022
Uppsala University
2022
University of Freiburg
2006-2007
University of Bayreuth
1995-2001
Research Article| September 01, 2007 Non-Newtonian rheological law for highly crystalline dome lavas Yan Lavallée; Lavallée 1Earth and Environment, Ludwig-Maximilians University Munich, Theresienstraße 41/III, D80333, Germany Search other works by this author on: GSW Google Scholar Kai-Uwe Hess; Hess Benoit Cordonnier; Cordonnier Donald Bruce Dingwell Geology (2007) 35 (9): 843–846. https://doi.org/10.1130/G23594A.1 Article history received: 03 Jan rev-recd: 30 Apr accepted: May first...
Abstract The ingestion of volcanic ash by jet engines is widely recognized as a potentially fatal hazard for aircraft operation. high temperatures (1,200–2,000 °C) typical exacerbate the impact provoking its melting and sticking to turbine parts. Estimation this potential complicated fact that chemical composition, which affects temperature at becomes liquid, can vary amongst volcanoes. Here, based on experiments, we parameterize behaviour develop model predict conditions global...
Research Article| July 01, 2012 The viscous-brittle transition of crystal-bearing silicic melt: Direct observation magma rupture and healing B. Cordonnier; Cordonnier * 1Geological Institute, Swiss Federal Institute Technology, Sonneggstrasse 5, 8092 Zürich, Switzerland2Department Earth Planetary Science, University California–Berkeley, Berkeley, California 94720-4767, USA *E-mail: benoit.cordonnier@erdw.ethz.ch. Search for other works by this author on: GSW Google Scholar L. Caricchi;...
Volcanic eruptions are regulated by the rheology of magmas and their ability to degas. Both detail evolution stresses within ascending subvolcanic magma. But as magma is forced through ductile-brittle transition, new pathways emerge cracks nucleate, propagate, coalesce, constructing a permeable network. Current analyses dynamics center on models glass neglecting important aspects such incremental strain accommodation (the key monitoring tool of) seismicity. Here, in combined-methods study,...
[1] Sintering and densification are ubiquitous processes influencing the emplacement of both effusive explosive products volcanic eruptions. Here we sinter ash-size fragments a synthetic National Institute Standards Technology viscosity standard glass at temperatures which resultant melt has ∼108-109 Pa.s 1bar to assess sintering dynamics under near-surface conditions. We track strength recovery via uniaxial compressive tests. observe that ash is dominantly time dependent, temperature grain...
Abstract Explosivity in erupting volcanoes is controlled by the degassing dynamics and viscosity of ascending magma conduit. Magma crystallisation enhances both heterogeneous bubble nucleation increases bulk viscosity. Nanolite has been suggested to enhance such processes too, but a noticeably higher extent. Yet precise causes resultant strong increase remain unclear. Here we report experimental results for rapid nanolite natural silicic extent subsequent increase. Nanolite-free...
Other| October 01, 1997 Viscosity, fragility, and configurational entropy of melts along the join SiO2 -NaAlSiO4 Michael J. Toplis; Toplis Universitaet Bayreuth, Bayerisches Geoinstitut, Federal Republic Germany Search for other works by this author on: GSW Google Scholar Donald B. Dingwell; Dingwell Kai-Uwe Hess; Hess Tommaso Lenci Author Article Information Publisher: Mineralogical Society America First Online: 02 Mar 2017 Online ISSN: 1945-3027 Print 0003-004X Copyright © American...
Other| April 01, 1995 The influence of excess alkalis on the viscosity a haplogranitic melt K. U. Hess; Hess Universitaet Bayreuth, Bayerisches Geoinstitut, Federal Republic Germany Search for other works by this author on: GSW Google Scholar D. B. Dingwell; Dingwell S. L. Webb American Mineralogist (1995) 80 (3-4): 297–304. https://doi.org/10.2138/am-1995-3-411 Article history first online: 02 Mar 2017 Cite View This Citation Add to Manager Share Icon Twitter LinkedIn Tools Get Permissions...
Abstract Volcanic ash is often deposited in a hot state. containing glass, above the glass transition interval, has potential to sinter viscously both itself (particle‐particle) and exposed surfaces. Here we constrain kinetics of this process experimentally under nonisothermal conditions using standard glasses. In absence external load, dominantly driven by surface relaxation. such cases sintering rate limited melt viscosity, size particles melt‐vapor interfacial tension. We propose...
Rheological variations have been postulated as the cause of transitions from effusive to explosive volcanic eruption style. Rheology is integrally linked composition and textural state (porosity, crystallinity) magma well stress, temperature strain rate operative during flow. This study characterises rheological behaviour and, importantly, evolution physical properties two magmas (with different crystallinity porosity) Volcán de Colima (Mexico) — a system known for its rapid fluctuations in...
The effect of chemical composition on the Raman spectra a series natural calcalkaline silicate glasses has been quantified by performing electron microprobe analyses and obtaining glassy filaments (~450 µm) derived from magma mingling experiment. results provide robust compositionally‐dependent database for along series. An empirical model based both acquired an ideal mixing equation between basaltic rhyolitic end‐members is constructed enabling estimation degree polymerization using...
Storage and transport of silicate melts in the Earth's crust their emplacement on planet's surface occur almost exclusively at sub-liquidus temperatures. At these conditions, undergo crystallization under a wide range cooling-rates, deformation-rates, oxygen fugacities (fO2). Oxygen fugacity is known to influence thermodynamics kinetics magmas lavas. Yet, its rheology remains largely uncharted. We present first rheological characterization crystallizing lavas along natural cooling paths...
To develop Raman spectroscopy as a quantitative tool in both geosciences and planetary sciences the effect of iron oxidation state (Fe3+/Fetot) on spectra basaltic pantelleritic glasses has been investigated. We have used remelted pantellerite from Pantelleria Island synthetic iron-rich [from Chevrel et al. (2014)].
Abstract Degassing dynamics play a crucial role in controlling the explosivity of magma at erupting volcanoes. magmatic water typically involves bubble nucleation and growth, which drive ascent. Crystals suspended may influence both growth bubbles. Micron- to centimeter-sized crystals can cause heterogeneous facilitate coalescence. Nanometer-scale crystalline phases, so-called “nanolites”, are an underreported phenomenon could exert primary control on eruptive style silicic Yet nanolites...
The fusion dynamics of volcanic ash strongly impacts deposition in hot parts jet engines. In this study, we investigate the sintering behavior using natural intermediate composition, erupted 2012 at Santiaguito Volcano, Guatemala. A material science procedure was followed which monitored geometrical evolution cylindrical-shaped compact upon heating from 50 to 1400°C a microscope. Combined morphological, mineralogical, and rheological analyses helped define during constrain their sticking...