Daniel Viete

Daniel Viete
Johns Hopkins University | JHU · Department of Earth and Planetary Sciences

BSc, BEng (Hons), PhD

About

37
Publications
9,039
Reads
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1,177
Citations
Additional affiliations
September 2014 - present
Durham University
Position
  • International Junior Research Fellow
August 2013 - August 2013
University of California, Santa Barbara
Position
  • Fulbright Visiting Scholar
January 2013 - July 2013
Northeastern University (Shenyang, China)
Position
  • Natural Science Foundation of China International Young Scientist
Education
February 2005 - November 2008
Australian National University
Field of study
  • Metamorphic Petrology, Structural Geology, Tectonics
February 2000 - November 2004
Monash University (Australia)
Field of study
  • Civil Engineering
February 2000 - November 2003
Monash University (Australia)
Field of study
  • Geology

Publications

Publications (37)
Article
Full-text available
In this paper we examine the length scales of major element diffusion in garnet during the Barrovian metamorphism. The role of diffusion in the flattening of Mn zoning profiles in garnet with increasing metamorphic grade across the Barrovian metamorphic series is ambiguous. However, the loss of distinct Mn-defined secondary compositional zoning in...
Article
New SHRIMP U/Pb zircon ages of 472.2 ± 5.8 Ma and 471.2 ± 5.9 Ma are presented for the age of peak metamorphism of Barrovian migmatites. 40Ar/39Ar ages for white mica from the Barrovian metamorphic series are presented, and are recalculated using recently-proposed revisions to the 40K decay constants to allow more precise and accurate comparison wi...
Article
Full-text available
This contribution presents a new model for the Grampian-age tectonothermal development of the Buchan Block and Barrovian-type regions to its west, in the Grampian Terrane, Scotland. The model has drawn on evidence gathered from field mapping, microstructural analysis, metamorphic petrology and mafic magma geochemistry to propose that emplacement of...
Article
Theory from fracture mechanics and thermodynamics coupled with the results of experimental studies provides evidence to suggest that the adsorption of carbon dioxide on coal causes a decrease in the coal strength. Coal weakening by the introduction of CO2 to a coal seam may induce fracturing, causing a permeability increase under in situ conditions...
Article
Full-text available
Large earthquakes occur in rocks undergoing high-pressure/low-temperature metamorphism during subduction. Rhythmic major-element zoning in garnet is a common product of such metamorphism, and one that must record a fundamental subduction process. We argue that rhythmic major-element zoning in subduction zone garnets from the Franciscan Complex, Cal...
Article
Full-text available
The type locality for high-temperature, low-pressure regional metamorphism, the Buchan Block in NE Scotland, exhibits profound differences to the rest of the Grampian Terrane. These differences have led some to regard the Buchan Block as an exotic crustal fragment comprising Precambrian basement gneisses and cover rocks thrust into their current po...
Article
Full-text available
Short-duration regional metamorphism is a recently observed and poorly understood phenomenon in metamorphic geology. In this review, it is defined as metamorphism on time scales that limit length scales (of the associated thermal anomaly) to significantly less than the thickness of the orogenic crust (<10 myr) or subducted oceanic lithosphere (<5 m...
Article
This paper investigates the influence of the presence of a joint (vertically or horizontally oriented) on the hydromechanical behavior of sandstone under undrained triaxial conditions. A series of undrained triaxial experiments was performed on intact and horizontally and vertically jointed sandstone samples under different confining pressures and...
Article
In rock masses containing multiple joint sets the joints will intersect. The geometric nature of such joint intersections can influence the hydro-mechanical response of jointed rock. An undrained experimental study was performed on fully-saturated, doubly-jointed sandstone specimens. Testing considered a variety of joint orientations and interconne...
Article
In this paper we examine the length scales of major element diffusion in garnet during the Barrovian metamorphism. The role of diffusion in the flattening of Mn zoning profiles in garnet with increasing metamorphic grade across the Barrovian metamorphic series is ambiguous. However, the loss of distinct Mn-defined secondary compositional zoning in...
Article
A geochronological traverse across the Barrovian metamorphic series, Scotland, shows 40Ar/39Ar apparent age spectra that reflect the influence of progressive metamorphism during the Grampian orogenic episode. The lowest-grade units of the Barrovian metamorphic series retain pre-Grampian detrital ages as components of their white mica 40Ar/39Ar appa...
Article
Full-text available
Creation of optimal fracture networks through enhanced geothermal system within the reservoir for the extraction of the geothermal energy will require proper understanding of the thermo-mechanical behavior of the reservoir rocks i.e. granites. Current research work has focused the thermo-mechanical properties of granite under various temperature an...
Article
Full-text available
D. R. Viete, G. J. H. Oliver and S. A. Wilde comment: First, we would like to commend Aoki et al . (2013) on a careful study and thought-provoking manuscript. Their interpretation of the Barrovian metamorphism as a fundamentally retrograde feature offers a refreshing alternative to the more conventional ‘peak-metamorphic’ models.
Article
Limitations on the joint orientations for which a joint is free to fail exclusively by sliding (without the need for rupture of intact material), for a given specimen height-to-diameter ratio (L/D), can influence the results obtained from uniaxial compressive strength (UCS) testing of jointed rock. For example, a jointed specimen with L/D = 2 can o...
Article
[1] The hydro-mechanical behaviour of singly-jointed sandstone under undrained triaxial conditions was studied. Maximum induced pore-water pressure was observed to increase with increasing joint orientation from 0° to 45°, for all confining pressures considered. For a 60° joint orientation, a considerable drop in maximum induced pore-water pressure...
Article
A study was initiated to investigate the effects of gaseous and super-critical carbon dioxide (CO2) adsorption on bituminous coal strength. Uniaxial compressive strength (UCS) experiments were conducted on bituminous coal samples from the southern Sydney Basin saturated with gaseous CO2, super-critical CO2 and N2 at various pressures, and a tempera...
Conference Paper
The behaviour of rock differs under different physical conditions, and the mechanical properties do not reflect the actual behaviour of a rock formation in the subsurface under different temperature conditions. Therefore, enhanced geothermal systems (EGSs) and nuclear disposal sites require a detailed understanding of the thermo-mechanical properti...
Article
Carbon dioxide (CO2) sequestration in deep, unmineable coal seams may provide an immediate and economically feasible solution for mitigation of anthropogenic CO2 emissions. Coal contains natural cleats, which largely control fluid movement in coal seams. This study uses experimental and numerical methods to investigate the variables (i.e. injection...
Article
Proposals for action to combat human-induced climate change have included large-scale sequestration of carbon dioxide (CO2) in geological media, including unminable coal seams. Such work requires intimate knowledge of how the mechanical properties of coal will respond in the presence of CO2. Laboratory-based work on the topic encounters the issue o...
Article
Uniaxial Compressive Strength (UCS) testing of Hawkesbury sandstone was carried out at various temperatures between 25 and 950 °C to explore the mechanical response of the sandstone to significant changes in temperature, as expected for enhanced geothermal energy systems, nuclear waste disposal and underground coal gasification. The UCS testing res...
Article
Carbon dioxide (CO2) sequestration in deep, unmineable coal seams provides a promising opportunity for the reduction of anthropogenic greenhouse gas emissions. However, little is known about optimal design features of the required in-ground infrastructure. Here, we report on a numerical study investigating the influence of the number of injection (...
Article
Using existing experimental data from Uniaxial Compressive Strength (UCS) testing, constitutive models were produced to describe the influence of joint geometry (joint location, trace length and orientation) on the UCS of rock containing partially-spanning joints. Separate approaches were used to develop two models: a multivariable regression model...
Article
Triaxial experiments were carried out on cylindrical samples to investigate the influence of confining pressure on the deviatoric axial stress at which crack initiation occurs in saturated sandstone. Samples were subjected to different confining pressures (2, 5, 8, 10 and 12 MPa) and a constant pore water pressure of 1 MPa during testing to failure...
Article
The manner by which the properties of discontinuities within a rock mass influence its overall rock mass behavior is a topic that remains poorly understood. This study explores this issue, focusing on the role that discontinuity geometry plays in governing failure mechanism. Uniaxial Compressive Strength (UCS) testing was carried out on natural san...
Article
The influence of inertial effects on the flow of fluids through fractured media is a topic of interest for a number of engineering applications, particularly within the energy sector (e.g. production from gas and oil reservoirs, heat extraction from enhanced geothermal systems, coal-bed methane production). The ‘cubic law’ can provide a simple rela...
Article
Energy efficiency (specific energy) and penetration rate in rock drilling processes are dependent on various operational variables (applied load, torque etc.) in addition to the physico-mechanical properties of the rock being drilled. Experimental work, using a laboratory drilling setup, was carried out to investigate the interplay between the vari...
Article
Full-text available
A geochronological traverse across the Barrovian metamorphic series, Scotland, shows Ar-40/Ar-39 apparent age spectra that reflect the influence of progressive metamorphism during the Grampian orogenic episode. The lowest-grade units of the Barrovian metamorphic series retain pre-Grampian detrital ages as components of their white mica Ar-40/Ar-39...
Article
Published U/Pb ages for the syn-metamorphic gabbros and granites of the Grampian Terrane, Scotland, that provided heat for the classical Barrovian metamorphism, suggests that they were emplaced between 473.5 and 470 Ma. New SHRIMP U/Pb ages of 472.2 ± 5.8 Ma and 470.4 ± 6.1 Ma for peak metamorphism in the highest-grade units of the Barrovian metamo...
Article
Carbon dioxide displays a strong affinity for coal due to its propensity to adsorb to the coal surface. The process of CO2 adsorption on coal causes lowering of surface energy and, it is hypothesised that an associated decrease in surface film confinement results in a decrease in material tensile resistance. Following the results of work carried ou...

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