Articles | Volume 7, issue 4
https://doi.org/10.5194/se-7-1171-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/se-7-1171-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Method article
| 
03 Aug 2016
Method article |
| 03 Aug 2016
X-ray computed tomography investigation of structures in Opalinus Clay from large-scale to small-scale after mechanical testing
Annette Kaufhold
Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2,
30655 Hanover, Germany
Federal Office for Radiation Protection (BFS), Willy-Brandt-Straße 5,
38226 Salzgitter, Germany
Matthias Halisch
CORRESPONDING AUTHOR
Leibniz Institute for Applied Geophysics (LIAG), Stilleweg 2, 30655
Hanover, Germany
Gerhard Zacher
GE Sensing & Inspection Technologies GmbH, Niels-Bohr-Straße 7,
31515 Wunstorf, Germany
Stephan Kaufhold
Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2,
30655 Hanover, Germany
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Sven Nordsiek and Matthias Halisch
Geosci. Instrum. Method. Data Syst., 13, 63–73, https://doi.org/10.5194/gi-13-63-2024, https://doi.org/10.5194/gi-13-63-2024, 2024
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Research data resulting from geoscientific laboratory methods comprise multiple types and formats. A diversity of Earth system science fuels are needed to make research data available to scientists beyond a particular discipline. Global working groups define standards and create tools to improve research data handling in general. Adaption of these solutions to the needs of the geoscientific disciplines is vital to enable the development of a widely applicable geoscientific laboratory database.
Raphael Dlugosch, Michael Mertineit, Michael Schramm, Melanie Hein, Stephan Kaufhold, and Lisa Richter
Saf. Nucl. Waste Disposal, 2, 51–51, https://doi.org/10.5194/sand-2-51-2023, https://doi.org/10.5194/sand-2-51-2023, 2023
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The fluid content of salt rocks is an important parameter to evaluate their barrier properties. The measurements are time intensive, and the results are highly dependent on the sample selection and preparation. Nuclear magnetic relaxation relaxometry is an established non-invasive petrophysical method, but it has not been used extensively for rock salt to date. The first results show that NMR has promising features with respect to the analysis of the fluid content of salt rocks.
Peleg Haruzi, Regina Katsman, Matthias Halisch, Nicolas Waldmann, and Baruch Spiro
Solid Earth, 12, 665–689, https://doi.org/10.5194/se-12-665-2021, https://doi.org/10.5194/se-12-665-2021, 2021
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In this paper, we evaluate a multi-methodological approach for the comprehensive characterization of reservoir sandstones. The approach enables identification of links between rock permeability and textural and topological rock descriptors quantified at microscale. It is applied to study samples from three sandstone layers of Lower Cretaceous age in northern Israel, which differ in features observed at the outcrop, hand specimen and micro-CT scales, and leads to their accurate characterization.
Peleg Haruzi, Regina Katsman, Baruch Spiro, Matthias Halisch, and Nicolas Waldmann
Solid Earth Discuss., https://doi.org/10.5194/se-2019-21, https://doi.org/10.5194/se-2019-21, 2019
Revised manuscript not accepted
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We studied petrophysical characteristics of three consecutive sandstone layers of the Lower Cretaceous Hatira Formation from Israel. Evaluated micro- and macro-scale petrophysical properties predetermined the permeability of the layers, measured in turn in the lab and upscaled from pore-scale velocities. Two scales of porosity variations were found: at 300 μm scale due to pores size variability, and at 2 mm scale due to high and low porosity occlusions, suggested to control the permeability.
Zeyu Zhang, Sabine Kruschwitz, Andreas Weller, and Matthias Halisch
Solid Earth, 9, 1225–1238, https://doi.org/10.5194/se-9-1225-2018, https://doi.org/10.5194/se-9-1225-2018, 2018
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We investigate the pore space of rock samples with respect to different petrophysical parameters using various methods, which provide data on pore size distributions. The resulting cumulative distributions of pore volume as a function of pore size are compared. Considering that the methods differ with regard to their limits of resolution, a multiple-length-scale characterization of the pore space geometry is proposed that is based on a combination of the results from all of these methods.
Georg H. Grathoff, Markus Peltz, Frieder Enzmann, and Stephan Kaufhold
Solid Earth, 7, 1145–1156, https://doi.org/10.5194/se-7-1145-2016, https://doi.org/10.5194/se-7-1145-2016, 2016
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This study improves our understanding of the evolution of pores in shales for modelling transport properties. 3-D microscopy on early and postmature Posidonia Shales showed similar porosities and pore size distributions. Large isolated pore clusters are within carbonates and clay minerals. Pores form during maturation in the postmature-matrix-filling organic matter. Modelled permeabilities are lowest perpendicular to bedding. They decrease with increasing maturity and are comparable to experimental data.
Matthias Halisch, Holger Steeb, Steven Henkel, and Charlotte M. Krawczyk
Solid Earth, 7, 1141–1143, https://doi.org/10.5194/se-7-1141-2016, https://doi.org/10.5194/se-7-1141-2016, 2016
Aaron Peche, Matthias Halisch, Alexandru Bogdan Tatomir, and Martin Sauter
Solid Earth, 7, 727–739, https://doi.org/10.5194/se-7-727-2016, https://doi.org/10.5194/se-7-727-2016, 2016
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In this case study, we compute georeservoir specific capillary pressure-saturation- interfacial area relationships by implementing a FEM-based two-phase flow model on μ-CT-based modelling domains. We propose a recommended practice for deriving a model and model setup for the successful modelling of such types of problems on micro-CT obtained geometries.
Britta Schoesser, Atefeh Ghorbanpour, Matthias Halisch, and Markus Thewes
Solid Earth Discuss., https://doi.org/10.5194/se-2016-42, https://doi.org/10.5194/se-2016-42, 2016
Revised manuscript not accepted
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In summary, the µ-CT technique delivers a valuable contribution for the research on the interaction of bentonite suspensions penetration the pore space of non-cohesive media. This study shows the missing visual evidence concerning the theoretical interaction models of the bentonite suspension in the pore space on microscale. The Imaging results have been cross-validated with laboratory experiments and are in good agreement with each other.
Mayka Schmitt, Matthias Halisch, Cornelia Müller, and Celso Peres Fernandes
Solid Earth, 7, 285–300, https://doi.org/10.5194/se-7-285-2016, https://doi.org/10.5194/se-7-285-2016, 2016
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In this paper we show how the shapes of irregular rock particles (pores) can be classified and quantified based on binary 3-D images. The methodology requires the measurement of basic 3-D particle descriptors and a shape classification that involves the similarity of artificial objects, which is based on main pore network detachments and 3-D sample sizes. The results were validated for three sandstones (S1, S2, and S3) from distinct reservoirs.
Related subject area
Sedimentology
Fold localization at pre-existing normal faults: field observations and analogue modelling of the Achental structure, Northern Calcareous Alps, Austria
The influence of extraction of various solvents on chemical properties on Chang 7 shale, Ordos Basin, China
Deep vs. shallow – two contrasting theories? A tectonically activated Late Cretaceous deltaic system in the axial part of the Mid-Polish Trough: a case study from southeast Poland
Miocene high elevation in the Central Alps
What makes seep carbonates ignore self-sealing and grow vertically: the role of burrowing decapod crustaceans
Dawn and dusk of Late Cretaceous basin inversion in central Europe
Simulating permeability reduction by clay mineral nanopores in a tight sandstone by combining computer X-ray microtomography and focussed ion beam scanning electron microscopy imaging
Birth and closure of the Kallipetra Basin: Late Cretaceous reworking of the Jurassic Pelagonian–Axios/Vardar contact (northern Greece)
High-resolution analysis of the physicochemical characteristics of sandstone media at the lithofacies scale
Sediment history mirrors Pleistocene aridification in the Gobi Desert (Ejina Basin, NW China)
Tectonic processes, variations in sediment flux, and eustatic sea level recorded by the 20 Myr old Burdigalian transgression in the Swiss Molasse basin
Miocene basement exhumation in the Central Alps recorded by detrital garnet geochemistry in foreland basin deposits
Can anaerobic oxidation of methane prevent seafloor gas escape in a warming climate?
Fault-controlled dolomitization in the Montagna dei Fiori Anticline (Central Apennines, Italy): record of a dominantly pre-orogenic fluid migration
Precipitation of dolomite from seawater on a Carnian coastal plain (Dolomites, northern Italy): evidence from carbonate petrography and Sr isotopes
The Ogooue Fan (offshore Gabon): a modern example of deep-sea fan on a complex slope profile
Formation of linear planform chimneys controlled by preferential hydrocarbon leakage and anisotropic stresses in faulted fine-grained sediments, offshore Angola
From oil field to geothermal reservoir: assessment for geothermal utilization of two regionally extensive Devonian carbonate aquifers in Alberta, Canada
Sedimentary mechanisms of a modern banded iron formation on Milos Island, Greece
Porosity and permeability determination of organic-rich Posidonia shales based on 3-D analyses by FIB-SEM microscopy
4-D imaging of sub-second dynamics in pore-scale processes using real-time synchrotron X-ray tomography
X-ray CT analyses, models and numerical simulations: a comparison with petrophysical analyses in an experimental CO2 study
Syn-eruptive, soft-sediment deformation of deposits from dilute pyroclastic density current: triggers from granular shear, dynamic pore pressure, ballistic impacts and shock waves
Record of Early Toarcian carbon cycle perturbations in a nearshore environment: the Bascharage section (easternmost Paris Basin)
Shallow water carbonate platforms (Late Aptian–Early Albian, Southern Apennines) in the context of supraregional to global changes: re-appraisal of palaeoecological events as reflectors of carbonate factory response
Phanerozoic environments of black shale deposition and the Wilson Cycle
Particle size distributions by laser diffraction: sensitivity of granular matter strength to analytical operating procedures
Willemijn Sarah Maria Theresia van Kooten, Hugo Ortner, Ernst Willingshofer, Dimitrios Sokoutis, Alfred Gruber, and Thomas Sausgruber
Solid Earth, 15, 91–120, https://doi.org/10.5194/se-15-91-2024, https://doi.org/10.5194/se-15-91-2024, 2024
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Extensional deformation creates structures that may be reactivated during subsequent shortening. The Achental structure within the Northern Calcareous Alps fold-and-thrust belt is a natural example of a basin margin that was inverted during Alpine orogeny. We have studied the influence of such inherited inhomogeneities in the field and as an analogue model. We find that oblique shortening can create structures outlining pre-existing faults within a single deformation event.
Yan Cao, Zhijun Jin, Rukai Zhu, and Kouqi Liu
Solid Earth, 14, 1169–1179, https://doi.org/10.5194/se-14-1169-2023, https://doi.org/10.5194/se-14-1169-2023, 2023
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Fourier transform infrared (FTIR) was performed on shale before and after solvent extraction. The extraction yield from shale with THF is higher than other solvents. The organic-C-normalized yield of a mature sample is higher than other samples. The aromaticity of organic matter increases, and the length of organic matter aliphatic chains does not vary monotonically with increasing maturity. The results will help in the selection of organic solvents for oil-washing experiments of shale.
Zbyszek Remin, Michał Cyglicki, and Mariusz Niechwedowicz
Solid Earth, 13, 681–703, https://doi.org/10.5194/se-13-681-2022, https://doi.org/10.5194/se-13-681-2022, 2022
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Traditionally, the axial part of the Polish Basin, i.e. the Mid-Polish Trough, was interpreted as the deepest and most subsiding part of the basin during the Cretaceous times. We interpret this area conversely, as representing a landmass – the Łysogóry–Dobrogea Land. Inversion-related tectonics, uplift on the one hand and enhanced subsidence on the other, drove the development of the Szozdy Delta within the axial part of the basin. New heavy mineral data suggest different burial histories.
Emilija Krsnik, Katharina Methner, Marion Campani, Svetlana Botsyun, Sebastian G. Mutz, Todd A. Ehlers, Oliver Kempf, Jens Fiebig, Fritz Schlunegger, and Andreas Mulch
Solid Earth, 12, 2615–2631, https://doi.org/10.5194/se-12-2615-2021, https://doi.org/10.5194/se-12-2615-2021, 2021
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Here we present new surface elevation constraints for the middle Miocene Central Alps based on stable and clumped isotope geochemical analyses. Our reconstructed paleoelevation estimate is supported by isotope-enabled paleoclimate simulations and indicates that the Miocene Central Alps were characterized by a heterogeneous and spatially transient topography with high elevations locally exceeding 4000 m.
Jean-Philippe Blouet, Patrice Imbert, Sutieng Ho, Andreas Wetzel, and Anneleen Foubert
Solid Earth, 12, 2439–2466, https://doi.org/10.5194/se-12-2439-2021, https://doi.org/10.5194/se-12-2439-2021, 2021
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Biochemical reactions related to hydrocarbon seepage are known to induce carbonates in marine sediments. Seep carbonates may act as seals and force lateral deviations of rising hydrocarbons. However, crustacean burrows may act as efficient vertical fluid channels allowing hydrocarbons to pass through upward, thereby allowing the vertical growth of carbonate stacks over time. This mechanism may explain the origin of carbonate columns in marine sediments throughout hydrocarbon provinces worldwide.
Thomas Voigt, Jonas Kley, and Silke Voigt
Solid Earth, 12, 1443–1471, https://doi.org/10.5194/se-12-1443-2021, https://doi.org/10.5194/se-12-1443-2021, 2021
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Basin inversion in central Europe is believed to have started during Late Cretaceous (middle Turonian) and probably proceeded until the Paleogene. Data from different marginal troughs in central Europe point to an earlier start of basin inversion (in the Cenomanian). The end of inversion is overprinted by general uplift but had probably already occurred in the late Campanian to Maastrichtian. Both the start and end of inversion occurred with low rates of uplift and subsidence.
Arne Jacob, Markus Peltz, Sina Hale, Frieder Enzmann, Olga Moravcova, Laurence N. Warr, Georg Grathoff, Philipp Blum, and Michael Kersten
Solid Earth, 12, 1–14, https://doi.org/10.5194/se-12-1-2021, https://doi.org/10.5194/se-12-1-2021, 2021
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In this work, we combined different imaging and experimental measuring methods for analysis of cross-scale effects which reduce permeability of tight reservoir rocks. Simulated permeability of digital images of rocks is often overestimated, which is caused by non-resolvable clay content within the pores of a rock. By combining FIB-SEM with micro-XCT imaging, we were able to simulate the true clay mineral abundance to match experimentally measured permeability with simulated permeability.
Lydia R. Bailey, Filippo L. Schenker, Maria Giuditta Fellin, Miriam Cobianchi, Thierry Adatte, and Vincenzo Picotti
Solid Earth, 11, 2463–2485, https://doi.org/10.5194/se-11-2463-2020, https://doi.org/10.5194/se-11-2463-2020, 2020
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The Kallipetra Basin, formed in the Late Cretaceous on the reworked Pelagonian–Axios–Vardar contact in the Hellenides, is described for the first time. We document how and when the basin evolved in response to tectonic forcings and basin inversion. Cenomanian extension and basin widening was followed by Turonian compression and basin inversion. Thrusting occurred earlier than previously reported in the literature, with a vergence to the NE, at odds with the regional SW vergence of the margin.
Adrian Linsel, Sebastian Wiesler, Jens Hornung, and Matthias Hinderer
Solid Earth, 11, 1511–1526, https://doi.org/10.5194/se-11-1511-2020, https://doi.org/10.5194/se-11-1511-2020, 2020
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We present a high-resolution 3D analysis of the physicochemical characteristics of two sandstone cubes at the submeter scale. Our study provides insight into the spatial distribution and the controlling factors of small-scale heterogeneity in sandstone media. A comprehensive physicochemical data set is provided, which may help to evaluate the degree of uncertainty that should be considered in field-scale property models.
Georg Schwamborn, Kai Hartmann, Bernd Wünnemann, Wolfgang Rösler, Annette Wefer-Roehl, Jörg Pross, Marlen Schlöffel, Franziska Kobe, Pavel E. Tarasov, Melissa A. Berke, and Bernhard Diekmann
Solid Earth, 11, 1375–1398, https://doi.org/10.5194/se-11-1375-2020, https://doi.org/10.5194/se-11-1375-2020, 2020
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We use a sediment core from the Gobi Desert (Ejina Basin, NW China) to illustrate the landscape history of the area. During 2.5 million years a sediment package of 223 m thickness has been accumulated. Various sediment types document that the area turned from a playa environment (shallow water environment with multiple flooding events) to an alluvial–fluvial environment after the arrival of the Heihe in the area. The river has been diverted due to tectonics.
Philippos Garefalakis and Fritz Schlunegger
Solid Earth, 10, 2045–2072, https://doi.org/10.5194/se-10-2045-2019, https://doi.org/10.5194/se-10-2045-2019, 2019
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The controls on the 20 Myr old Burdigalian transgression in the Swiss Molasse basin have been related to a reduction in sediment flux, a rise in global sea level, or tectonic processes in the adjacent Alps. Here, we readdress this problem and extract stratigraphic signals from the Upper Marine Molasse deposits in Switzerland. In conclusion, we consider rollback tectonics to be the main driving force controlling the transgression, which is related to a deepening and widening of the basin.
Laura Stutenbecker, Peter M. E. Tollan, Andrea Madella, and Pierre Lanari
Solid Earth, 10, 1581–1595, https://doi.org/10.5194/se-10-1581-2019, https://doi.org/10.5194/se-10-1581-2019, 2019
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The Aar and Mont Blanc regions in the Alps are large granitoid massifs characterized by high topography. We analyse when these granitoids were first exhumed to the surface. We test this by tracking specific garnet grains, which are exclusively found in the granitoid massifs, in the sediments contained in the alpine foreland basin. This research ties in with ongoing debates on the timing and mechanisms of mountain building.
Christian Stranne, Matt O'Regan, Martin Jakobsson, Volker Brüchert, and Marcelo Ketzer
Solid Earth, 10, 1541–1554, https://doi.org/10.5194/se-10-1541-2019, https://doi.org/10.5194/se-10-1541-2019, 2019
Mahtab Mozafari, Rudy Swennen, Fabrizio Balsamo, Hamdy El Desouky, Fabrizio Storti, and Conxita Taberner
Solid Earth, 10, 1355–1383, https://doi.org/10.5194/se-10-1355-2019, https://doi.org/10.5194/se-10-1355-2019, 2019
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The dolomitized intervals of the Lower Jurassic deposits exposed in the Montagna dei Fiori Anticline (Central Apennines, Italy) have been investigated. Accordingly, two fault-related dolomitization events were recognised and interpreted as having occurred before and during the Apenninic orogeny. The analyses suggest significant involvement of evaporitic fluids in both events, most likely derived from the underlying Upper Triassic Burano Formation in the detachment level.
Maximilian Rieder, Wencke Wegner, Monika Horschinegg, Stefanie Klackl, Nereo Preto, Anna Breda, Susanne Gier, Urs Klötzli, Stefano M. Bernasconi, Gernot Arp, and Patrick Meister
Solid Earth, 10, 1243–1267, https://doi.org/10.5194/se-10-1243-2019, https://doi.org/10.5194/se-10-1243-2019, 2019
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The formation of dolomite (CaMg(CO3)2), an abundant mineral in Earth's geological record, is still incompletely understood. We studied dolomites embedded in a 100 m thick succession of coastal alluvial clays of Triassic age in the southern Alps. Observation by light microscopy and Sr isotopes suggests that dolomites may spontaneously from concentrated evaporating seawater, in coastal ephemeral lakes or tidal flats along the western margin of the Triassic Tethys sea.
Salomé Mignard, Thierry Mulder, Philippe Martinez, and Thierry Garlan
Solid Earth, 10, 851–869, https://doi.org/10.5194/se-10-851-2019, https://doi.org/10.5194/se-10-851-2019, 2019
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A large quantity a continental material is transported to the oceans by the world rivers. Once in the ocean, these particles can be transported down the continental shelf thanks to underwater avalanches. The repetition of such massive events can form very important sedimentary deposits at the continent–ocean transition. Data obtained during an oceanic cruise in 2010 allowed us to study such a system located offshore of Gabon and to evaluate the importance sediment transport in this area.
Sutieng Ho, Martin Hovland, Jean-Philippe Blouet, Andreas Wetzel, Patrice Imbert, and Daniel Carruthers
Solid Earth, 9, 1437–1468, https://doi.org/10.5194/se-9-1437-2018, https://doi.org/10.5194/se-9-1437-2018, 2018
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A newly discovered type of hydrocarbon leakage structure is investigated following the preliminary works of Ho (2013; et al. 2012, 2013, 2016): blade-shaped gas chimneys instead of classical cylindrical ones. These so-called
Linear Chimneysare hydraulic fractures caused by overpressured hydrocarbon fluids breaching cover sediments along preferential directions. These directions are dictated by anisotropic stresses induced by faulting in sediments and pre-existing salt-diapiric structures.
Leandra M. Weydt, Claus-Dieter J. Heldmann, Hans G. Machel, and Ingo Sass
Solid Earth, 9, 953–983, https://doi.org/10.5194/se-9-953-2018, https://doi.org/10.5194/se-9-953-2018, 2018
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This study focuses on the assessment of the geothermal potential of two extensive upper Devonian aquifer systems within the Alberta Basin (Canada). Our work provides a first database on geothermal rock properties combined with detailed facies analysis (outcrop and core samples), enabling the identification of preferred zones in the reservoir and thus allowing for a more reliable reservoir prediction. This approach forms the basis for upcoming reservoir studies with a focus on 3-D modelling.
Ernest Chi Fru, Stephanos Kilias, Magnus Ivarsson, Jayne E. Rattray, Katerina Gkika, Iain McDonald, Qian He, and Curt Broman
Solid Earth, 9, 573–598, https://doi.org/10.5194/se-9-573-2018, https://doi.org/10.5194/se-9-573-2018, 2018
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Banded iron formations (BIFs) are chemical sediments last seen in the marine sedimentary record ca. 600 million years ago. Here, we report on the formation mechanisms of a modern BIF analog in the Cape Vani sedimentary basin (CVSB) on Milos Island, Greece, demonstrating that rare environmental redox conditions, coupled to submarine hydrothermal activity and microbial processes, are required for these types of rocks to form in the modern marine biosphere.
Georg H. Grathoff, Markus Peltz, Frieder Enzmann, and Stephan Kaufhold
Solid Earth, 7, 1145–1156, https://doi.org/10.5194/se-7-1145-2016, https://doi.org/10.5194/se-7-1145-2016, 2016
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This study improves our understanding of the evolution of pores in shales for modelling transport properties. 3-D microscopy on early and postmature Posidonia Shales showed similar porosities and pore size distributions. Large isolated pore clusters are within carbonates and clay minerals. Pores form during maturation in the postmature-matrix-filling organic matter. Modelled permeabilities are lowest perpendicular to bedding. They decrease with increasing maturity and are comparable to experimental data.
Katherine J. Dobson, Sophia B. Coban, Samuel A. McDonald, Joanna N. Walsh, Robert C. Atwood, and Philip J. Withers
Solid Earth, 7, 1059–1073, https://doi.org/10.5194/se-7-1059-2016, https://doi.org/10.5194/se-7-1059-2016, 2016
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State-of-the-art synchrotron x-ray imaging was used to observe micron scale transport processes in real time. The 20 Hz 3-D image acquisition rates give experimental data free from motion artefacts, and suitable for detailed quantitative analysis of the dynamic fluid distribution, flow pathways and processes. The method marks a major breakthrough in our ability to capture both sub-second and lower frequency non-equilibrium process in many geological or engineering systems.
Steven Henkel, Dieter Pudlo, Frieder Enzmann, Viktor Reitenbach, Daniel Albrecht, Leonhard Ganzer, and Reinhard Gaupp
Solid Earth, 7, 917–927, https://doi.org/10.5194/se-7-917-2016, https://doi.org/10.5194/se-7-917-2016, 2016
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This study investigates the experimentally induced effects of CO2 storage on underground reservoir sandstones by applying high-resolution computer tomography and standard petrophysical methods. The results of digital rock physic calculations derived from the µ-CT scans are compared with measurements achieved by the standard methods. Both approaches lead to similar results for coarse- and medium-grained sandstones but differ for fine-grained sediments.
G. A. Douillet, B. Taisne, È Tsang-Hin-Sun, S. K. Müller, U. Kueppers, and D. B. Dingwell
Solid Earth, 6, 553–572, https://doi.org/10.5194/se-6-553-2015, https://doi.org/10.5194/se-6-553-2015, 2015
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Sedimentary beds can exhibit signs of local deformation in pyroclastic strata. Patterns are reviewed and trigger mechanisms interpreted.
During an eruption, basal granular flows can have a fluidized behavior, inducing over- or underpressure at the bed interface. Basal shear can overturn strata. Large blocks ejected ballistically deform the ground when landing. Explosions at the vent produce shock waves that can destabilize a bed. These syn-eruptive triggers are specific to explosive volcanism.
M. Hermoso, D. Delsate, F. Baudin, L. Le Callonnec, F. Minoletti, M. Renard, and A. Faber
Solid Earth, 5, 793–804, https://doi.org/10.5194/se-5-793-2014, https://doi.org/10.5194/se-5-793-2014, 2014
A. Raspini
Solid Earth, 3, 225–249, https://doi.org/10.5194/se-3-225-2012, https://doi.org/10.5194/se-3-225-2012, 2012
J. Trabucho-Alexandre, W. W. Hay, and P. L. de Boer
Solid Earth, 3, 29–42, https://doi.org/10.5194/se-3-29-2012, https://doi.org/10.5194/se-3-29-2012, 2012
F. Storti and F. Balsamo
Solid Earth, 1, 25–48, https://doi.org/10.5194/se-1-25-2010, https://doi.org/10.5194/se-1-25-2010, 2010
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Short summary
The OPA material has been intensively studied by a variety of multiple scale and non-destructive 3-D X-ray CT investigations, following a consequent top-down approach to identify specific regions of interest. According to the mechanical experiment, it has been observed that the shear failure is located in a clay-rich area. Within the intersecting area of the two main fractures, a so called mylonitic zone with a particle reduction was observed on the open shear failure using CT and SEM techniques.
The OPA material has been intensively studied by a variety of multiple scale and non-destructive...
