Effects of hydrothermal alterations on physical and mechanical properties of rocks in the Kuril–Kamchatka island arc

Frolova, Yu. V.; Vladimir, Ladygin; Sergey, Rychagov; David, Zukhubaya

doi:10.1016/j.enggeo.2014.10.011

Cited by 105 publications

(43 citation statements)

References 12 publications

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“…Kaolin mineral found in the material of the hummocks of unit Ex19. This reinforces the idea of interaction between geothermal fluids, alteration and the instability (Julia, Vladimir, Sergey, & David, 2014;Mitchell et al, 2015) of the slopes of the South Dome.…”

Section: Discussionsupporting

confidence: 85%

Geomorphology of Las Derrumbadas dome complex, Puebla Mexico

et al. 2019

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This paper comprises a geomorphologic map of the Las Derrumbadas (LDR) volcanic complex in Mexico. The complex stretches over more than 285 km 2 , the stratigraphic column encompasses a range age from Cretacious to Quaternary. The methodology used involved the analysis of digital morphometric models, satellite imagery and absolute datings. The result is a 1:40,000 scale map, which is divided into two large geomorphologic groups in terms of the dominant processes: exogenic and endogenic This, in turn, are divided into various subgroups representing the morphological complexity of the study area, principally related to volcanic processes and their coherence with slope processes.

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Section: Discussionsupporting

confidence: 85%

Geomorphology of Las Derrumbadas dome complex, Puebla Mexico

et al. 2019

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“…Heap et al 2014) and grain boundary structure and contact (e.g. Heap et al 2014) are known to significantly modify the physical properties and thus affect the mechanical behaviour of volcanic rocks (Pola et al 2012;Frolova et al 2014;Meller & Kohl 2014;Wyering et al 2014;Navelot et al 2018). A recent study showed that advanced argillic alteration of andesite can promote, under the same pressure conditions, a change in failure mode from brittle to ductile (Mordensky et al 2019).…”

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confidence: 99%

Influence of hydrothermal alteration on the elastic behaviour and failure of heat-treated andesite from Guadeloupe

Nicolas

Levy

Sissmann

et al. 2020

Geophysical Journal International

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Summary Studies on the mechanical behaviour of rocks, including volcanic rocks, usually seek for unaltered and simple material: rocks without macroscopic defects. However, volcanic rocks are often naturally altered due to the circulation of hydrothermal fluids. This alteration may influence mechanical and physical properties. Here, we study the effect of hydrothermal alteration on the elasticity and failure properties of andesite. A homogeneous block of natural andesite was retrieved from a quarry. Three samples were first heat-treated and then artificially altered at different temperatures by soaking them in a brine for one month at a pressure of 20 MPa and temperatures of 80○C, 180○C and 280○C. Heat-treated unaltered and altered samples were hydrostatically loaded up to 50 MPa and unloaded, while strains and elastic wave velocities were recorded. Samples were also triaxially deformed to failure at a constant strain rate and a confining pressure of 15 MPa. At ambient pressure, increased alteration temperature resulted in increased wave propagation velocity, thus increased dynamic elastic moduli. During hydrostatic loading, volumetric deformation at a given effective pressure decreased with alteration temperature denoting increased static elastic moduli. During triaxial loading, the degree of alteration decreased elastic compaction and peak stress at failure. These observations are interpreted as the result of micro-cracks in-filling by alteration minerals, and in particular smectite, a swelling-clay mineral with a low friction coefficient. The mechanical behaviour of a volcanic rock subjected to triaxial loading was modelled with a damage model based on crack propagation from pre-existing flaws. A decreasing friction coefficient within the flanks of the cracks leads to a decrease of the peak stress and explains the experimental observations.

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“…It corresponds to a retrograde system exhibiting, on its shallow part, an intense argillic alteration identified as the caprock of the fossil geothermal system 42 . The argillic alteration, with the formation of minerals such as pyrite and montmorillonite 43 , is expected to modify the www.nature.com/scientificreports www.nature.com/scientificreports/ petrophysical properties such as porosity of host rocks as shown in the work of Julia et al 44 . In this work, 7 samples; from clay-poor to clay-rich facies were impregnated with 14 C-PMMA in order to compare the two different autoradiographic methods for 14 C activity detection and porosity calculation on a wide range of porosities.…”

Section: Methodsmentioning

confidence: 99%

Comparison of phosphor screen autoradiography and micro-pattern gas detector based autoradiography for the porosity of altered rocks

Delayre

Sammaljärvi

Billon

et al. 2020

Sci Rep

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this study aims to further develop the 14 c-pMMA porosity calculation method with a novel autoradiography technique, the Micro-pattern gas detector autoradiography (MpGDA). in this study, the MpGDA is compared with phosphor screen autoradiography (SpA). A set of rock samples from Martinique island exhibiting a large range of connected porosities was used to validate the MpGDA method. calculated porosities were found to be in agreement with ones from the SpA and the tripleweight method (TW). The filmless nature of MPGDA as well as straightforward determination of C-14 radioactivity from the source rock makes the porosity calculation less uncertain. The real-time visualization of radioactivity from C-14 beta emissions by MPGDA is a noticeable improvement in comparison to SpA. Autoradiography has demonstrated its adaptability and reliability in several research areas. With regard to the development of autoradiographic techniques the very first autoradiograph was obtained by Becquerel in 1896, through exposition of an emulsion of silver halide crystals in contact with radioactive material 1. Autoradiographic techniques allow the production of spatial distribution of radioactivity in the material; the sample itself being the source of the radioactivity either as occurring naturally in the material or as artificially added radioactivity. In the case of geological samples, 238 U, 232 Th and 40 K bearing minerals are the main sources of natural radioactivity 1. The radioactive source may also be in the form of an artificial radioactive marker, such as 3 H or 14 C labelled methylmethacrylate (MMA) 2-4. Investigated samples are impregnated with the radiolabeled tracer and fixed in place via polymerization of the marked MMA in the connected pore network of rock samples. Thus, the image of the connected pore network can be produced by exposing the impregnated sample surface on a photographic film. This brief description corresponds to the 14 C polymethylmethacrylate (14 C-PMMA) autoradiography method 2-4 and will be used for porosity analysis in this work. In the field of nuclear waste management, the 14 C-PMMA method has been successfully applied to investigate the connected pore network of geological materials, radioelements diffusion within rock matrices and relations between the porosity and mineralogy of rocks 5-8. In the biological field, injecting the radioligands into living tissues allows to map the anatomical location of specific receptors by autoradiographic techniques. For instance, Larsson & Ullberg 9 introduced a new autoradiographic technique, the whole body macro autoradiography (WBA), allowing to study the distribution of 35 S-labelled penicillin in a rat using entire frozen sections of them after injection of radiolabeled tracer. In drug distribution studies, Young and Kuhar 10 were able to localize opioid receptors in a rat brain by 14 C, 3 H, 125 I and 35 S, and more recently, Fang et al. 11 studied the effect of cocaine, ketamine and methamphetamine on dopamine terminals in the striatum of rats using 18 ...

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Effects of hydrothermal alterations on physical and mechanical properties of rocks in the Kuril–Kamchatka island arc

Cited by 105 publications

References 12 publications

Geomorphology of Las Derrumbadas dome complex, Puebla Mexico

Geomorphology of Las Derrumbadas dome complex, Puebla Mexico

Influence of hydrothermal alteration on the elastic behaviour and failure of heat-treated andesite from Guadeloupe

Comparison of phosphor screen autoradiography and micro-pattern gas detector based autoradiography for the porosity of altered rocks

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