Elastic Softening of Limestone Upon Decarbonation With Episodic CO<sub>2</sub> Release

Head, D.; Vanorio, Tiziana; Clark, Anthony C.

doi:10.1029/2018jb015733

Cited by 3 publications

(1 citation statement)

References 74 publications

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“…The HTHP reactor vessel is rated for a maximum temperature of 510 °C, a maximum P c =34.5 MPa, and a maximum P f =13.8 MPa. A schematic of the interior of the reactor with the core holder is shown in Figure 1B, and further details about the apparatus can be found in Head et al (2018), Suwannasri et al (2018), and Allan et al (2016).…”

Section: Sample Characterization and Hydrothermal Synthesismentioning

confidence: 99%

Hydrothermal formation of fibrous mineral structures: The role on strength and mode of failure

Vanorio

Chung²,

Siman‐Tov³

et al. 2023

Front. Earth Sci.

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Studying the mechanisms that control the rheology of rocks and geomaterials is crucial as much for predicting geological processes as for functionalizing geomaterials. That requires the understanding of how structural arrangements at the micro and nano scale control the physical and mechanical properties at the macroscopic scale. This is an area of rock physics still in its infancy. In this paper, we focus the attention on the formation of cementitious phases made of micro- and nano-scale fibrous structures, and the controls of the arrangement of these phases on mechanical properties. We use hydrothermal synthesis, and the properties of hydrothermal water, to promote the growth of fibrous mineral phases having nano-size diameter and length of a few microns, creating disordered and entangled mats of fibrous bundles as those found in natural samples. We draw inferences from structural microscopy to inform a statistical model that establishes an interdependence between structural parameters of fibrous structures and bulk mechanical response. Structural parameters include number and length of fibers, spatial orientation, and fraction of fibrous threads bearing the load. Mechanical properties include strength and mode of failure. Results show that as the fibrous microstructure evolves from ordered and aligned to disordered and entangled, the mechanical response of the fibrous composite transitions from a brittle to ductile behavior. Furthermore, the disordered and entangled microstructure exhibits lower strength at failure though strength increases as the number of fibers within the microstructure increases. Finally, the longer the entangled fiber, the larger the strain that the matrix can accommodate. The value of this study lies in further understanding fault healing through hydrothermal fluids and how the physical properties of fibrous microstructures resulting from it control brittle-ductile transitions, and possibly, slow slip events along subduction zones.

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Section: Sample Characterization and Hydrothermal Synthesismentioning

confidence: 99%

Hydrothermal formation of fibrous mineral structures: The role on strength and mode of failure

Vanorio

Chung²,

Siman‐Tov³

et al. 2023

Front. Earth Sci.

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Whin Sill contact metamorphism in the Cow Green reservoir boreholes, Northern England: evidence for an Upper Teesdale source for the Whin Sill magma

Robinson

2020

PYGS

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Contact metamorphism of Carboniferous rocks by the Whin Sill in Upper Teesdale is documented utilizing boreholes drilled in the 1960s ground investigation for the Cow Green reservoir. Hedenbergite, prehnite and datolite are recorded for the first time, and the first analyses for seven contact minerals are presented. Pure limestones are recrystallized into saccharoidal marbles with average calcite grain sizes increasing from <0.1 mm at >20 m from the contact, up to 0.5 mm within 5 m from the contact. Grossular is the most abundant mineral, and along with epidote is recorded over 20 m from the sill contact; all other minerals are restricted to < c. 10 m from the contact. This substantial contact metamorphism around Cow Green is unique in comparison with other boreholes across the Alston Block that have penetrated even thicker leaves of the sill, and for which no contact metamorphic mineral development has been reported. The currently favoured model has the magma sourced from dykes on the southern and northern borders of the Alston Block, but the evidence in support is circumstantial. The contrast in the metamorphic development is definitive evidence that the heat flow linked to the Whin Sill intrusion in the Upper Teesdale area lasted much longer than other areas across the Block, giving strong support to the magma being sourced in this area, rather than from the dykes.Supplementary material: X-ray fluorescence whole rock Sr (ppm) analyses of limestone beds in boreholes 17, 18, 21, 22, 35, 39, 40 and 41 in Table S1, and Electron MicroProbe Analysis of garnet, feldspar, epidote, idocrase, prehnite, pyroxene and chlorite in Table S2 are available at: https://doi.org/10.6084/m9.figshare.c.5077640

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Rock physics and experimentation in decarbonizing the future

et al. 2021

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The transition to a low-carbon future involves every component of our productive life — from the energy we use, to the buildings we construct, to the materials we use in our daily lives. Realistically, the shift onto a low-carbon path cannot happen instantly but requires adopting short- and long-term solutions while assessing whether the solutions work in the physical world in which we live. In the short term, incremental technological improvements, such as transitioning to energy sources like natural gas, have the potential to yield immediate benefit to air quality and pollution. In the mid and long term, however, more far-reaching decarbonization technologies must be pursued to achieve game-changing outcomes. In the geosciences realm, leading technologies span from cleaner energy solutions to exploring alternative earth-inspired materials and processes. These include CO2 storage in geologic disposal sites along with its reuse for material manufacturing, the development of enhanced geothermal systems expanding the use of geothermal energy, and adapting subsurface processes to engineer greener processes and materials through geomimicry. In this landscape, experimentation and rock physics are at the crux of understanding rock-fluid processes and are the premise and foundation of decarbonizing our future. All of these applications require experimentation for wider public acceptance to avoid hasty solutions that are counterproductive. The cross-disciplinary nature of each endeavor is pivotal in assessing how processes induced by fluids, their chemistry, and thermal capacity affect the physical and mechanical properties of treated environments. This paper provides an account of the role that rock physics will play in leveraging knowledge across the nanosciences to underpin our path to a decarbonized future through chemical and thermal stimulation practices, solid-CO2 reactions, and engineering processes that manipulate geology to produce materials with functional properties.

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Elastic Softening of Limestone Upon Decarbonation With Episodic CO₂ Release

Cited by 3 publications

References 74 publications

Hydrothermal formation of fibrous mineral structures: The role on strength and mode of failure

Hydrothermal formation of fibrous mineral structures: The role on strength and mode of failure

Whin Sill contact metamorphism in the Cow Green reservoir boreholes, Northern England: evidence for an Upper Teesdale source for the Whin Sill magma

Rock physics and experimentation in decarbonizing the future

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Elastic Softening of Limestone Upon Decarbonation With Episodic CO2 Release

Cited by 3 publications

References 74 publications

Hydrothermal formation of fibrous mineral structures: The role on strength and mode of failure

Hydrothermal formation of fibrous mineral structures: The role on strength and mode of failure

Whin Sill contact metamorphism in the Cow Green reservoir boreholes, Northern England: evidence for an Upper Teesdale source for the Whin Sill magma

Rock physics and experimentation in decarbonizing the future

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Elastic Softening of Limestone Upon Decarbonation With Episodic CO₂ Release