Michael C. Jollands
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View article: Geochemistry of the Wyoming Craton from eclogite and pyroxenite xenoliths from the Aultman, Maxwell, and Schaffer kimberlites at the Colorado-Wyoming State Line
Geochemistry of the Wyoming Craton from eclogite and pyroxenite xenoliths from the Aultman, Maxwell, and Schaffer kimberlites at the Colorado-Wyoming State Line Open
View article: The first-formed hydrogen and nitrogen defects in natural diamond
The first-formed hydrogen and nitrogen defects in natural diamond Open
View article: Chemical Analysis in the Gemological Laboratory: XRF and LA-ICP-MS
Chemical Analysis in the Gemological Laboratory: XRF and LA-ICP-MS Open
View article: Temperature-dependent infrared spectroscopy of OH defects in Verneuil-grown corundum (α-Al2O3)
Temperature-dependent infrared spectroscopy of OH defects in Verneuil-grown corundum (α-Al2O3) Open
View article: Temperature-dependent FTIR spectroscopy of OH defects in Verneuil-grown corundum (α-Al2O3)
Temperature-dependent FTIR spectroscopy of OH defects in Verneuil-grown corundum (α-Al2O3) Open
The temperature dependence of the infrared absorption spectra of two Verneuil-grown corundum samples is investigated in the OH stretching range. The spectra display three main bands at 3184, 3232 and 3309 cm− 1, belonging to the…
View article: Mechanical Impact of Heterogeneously Distributed H<sub>2</sub>O on Quartz Deformation
Mechanical Impact of Heterogeneously Distributed H<sub>2</sub>O on Quartz Deformation Open
In order to identify relations between mechanical behavior, deformation mechanisms, microstructural properties, and H 2 O distribution, Tana‐quartzite samples with added H 2 O ranging from 0 to 0.5 wt.% were deformed by axial shortening at…
View article: Development of a large volume line scanning, high spectral range and resolution 3D hyperspectral photoluminescence imaging microscope for diamond and other high refractive index materials
Development of a large volume line scanning, high spectral range and resolution 3D hyperspectral photoluminescence imaging microscope for diamond and other high refractive index materials Open
Hyperspectral photoluminescence (PL) imaging is a powerful technique that can be used to understand the spatial distribution of emitting species in many materials. Volumetric hyperspectral imaging of weakly emitting color centers often nec…
View article: Hydrogen-related defects in diamond: A comparison between observed and calculated FTIR spectra
Hydrogen-related defects in diamond: A comparison between observed and calculated FTIR spectra Open
View article: Evolution of H2O content in deforming quartz aggregates: An experimental study
Evolution of H2O content in deforming quartz aggregates: An experimental study Open
View article: Vibrational properties of OH groups associated with divalent cations in corundum (<i>α</i>-Al<sub>2</sub>O<sub>3</sub>)
Vibrational properties of OH groups associated with divalent cations in corundum (<i>α</i>-Al<sub>2</sub>O<sub>3</sub>) Open
The infrared spectra of synthetic corundum (α-Al2O3) samples either doped directly with divalent cations (Mg2+) or containing divalent cations formed by reduction of trivalent cations in H2 gas (Co2+, Ni2+) may display broad OH stretching …
View article: Color Modification of Spinel by Nickel Diffusion: A New Treatment
Color Modification of Spinel by Nickel Diffusion: A New Treatment Open
This treatment can be readily identified by high nickel content and the presence of bands at 597 and 639 nm in absorption spectroscopy.
View article: Hide and Seek—Trace Element Incorporation and Diffusion in Olivine
Hide and Seek—Trace Element Incorporation and Diffusion in Olivine Open
Olivine, once overlooked as a host of trace elements, is becoming increasingly important for our understanding of the kinetic and equilibrium behaviour of these elements. Much of our understanding of trace element substitution and diffusio…
View article: Diffusion of Hydroxylated Si Vacancies in Olivine, and Its Relevance to Si Diffusion
Diffusion of Hydroxylated Si Vacancies in Olivine, and Its Relevance to Si Diffusion Open
The diffusion coefficient associated with the 3,612 cm −1 infrared absorbance band in H‐bearing olivine, attributed to a defect involving a vacant Si site balanced by four H + (i.e., ), was determined in H in‐diffusion experiments at 1200°…
View article: Experimental calibration of oxygen diffusion in garnet and implications for retention of primary oxygen isotopic signatures
Experimental calibration of oxygen diffusion in garnet and implications for retention of primary oxygen isotopic signatures Open
Knowledge of oxygen diffusion in garnet is crucial for a correct interpretation of oxygen isotopic signatures in natural samples. Scicchitano et al. (2022) reported a series of experiments with pyrope and YAG at P-T of 1-atm to 2.5 G…
View article: Hydrogen-Related Defects in Diamond: A Comparison between Observed and Calculated Ftir Spectra
Hydrogen-Related Defects in Diamond: A Comparison between Observed and Calculated Ftir Spectra Open
View article: Hydrogen diffusion mechanisms in quartz: insights from H–Li,<sup>2</sup>H–H and<sup>2</sup>H–H–Li exchange experiments
Hydrogen diffusion mechanisms in quartz: insights from H–Li,<sup>2</sup>H–H and<sup>2</sup>H–H–Li exchange experiments Open
The diffusivity and diffusion mechanisms of hydrogen together with with deuterium and lithium, parallel to the c axis of quartz, were investigated experimentally at 800°C, 0.1 GPa with the activity of H 2 O or 2 H 2 O ≈ 1 [ 2 H is used thr…
View article: Diffusion anisotropy of Ti in zircon and implications for Ti-in-zircon thermometry
Diffusion anisotropy of Ti in zircon and implications for Ti-in-zircon thermometry Open
View article: H diffusion in quartz dataset
H diffusion in quartz dataset Open
The following files contain LAICPMS and FTIR data for the submitted manuscript "Hydrogen diffusion mechanisms in quartz: insights from H-Li, 2H-H and 2H-H-Li exchange experiments" by Jollands et al.
View article: Oxygen diffusion in garnet: Experimental calibration and implications for timescales of metamorphic processes and retention of primary O isotopic signatures
Oxygen diffusion in garnet: Experimental calibration and implications for timescales of metamorphic processes and retention of primary O isotopic signatures Open
Knowledge of oxygen diffusion in garnet is crucial for a correct interpretation of oxygen isotope signatures in natural samples. A series of experiments was undertaken to determine the diffusivity of oxygen in garnet, which remains poorly …
View article: H diffusion in orthopyroxene and the retention of mantle water signatures
H diffusion in orthopyroxene and the retention of mantle water signatures Open
Natural gem quality orthopyroxene crystals were experimentally dehydrated between 720 °C and 1020 °C, varying silica activity (buffered by olivine-orthopyroxene or orthopyroxene-quartz), oxygen fugacity (log fO2 relative to the quartz-faya…
View article: The distribution of hydrogen/water in Al and Ti-containing forsterite: A thermodynamic model
The distribution of hydrogen/water in Al and Ti-containing forsterite: A thermodynamic model Open
The distribution of hydrogen across different crystallographic sites and point defects in forsterite is important because it determines how many properties, such as rheology, conductivity, diffusion and elemental partitioning are affected …
View article: Hydrogen diffusion in olivine: challenges and opportunities
Hydrogen diffusion in olivine: challenges and opportunities Open
<p>Understanding rates and mechanisms of diffusion in geologically relevant materials is important when considering, for example, electrical conductivity, rheology and, of course, diffusion chronometry. Olivine has received much atte…
View article: A combined Fourier transform infrared and Cr K-edge X-ray absorption near-edge structure spectroscopy study of the substitution and diffusion of H in Cr-doped forsterite
A combined Fourier transform infrared and Cr K-edge X-ray absorption near-edge structure spectroscopy study of the substitution and diffusion of H in Cr-doped forsterite Open
Single crystals of synthetic Cr-doped forsterite (Cr:Mg2SiO4) containing both Cr3+ and Cr4+ were partially hydroxylated in piston-cylinder apparatuses at 750–1300 ∘C and pressures from 0.5 to 2.5 GPa, with p(H2O) ≈Ptotal. The oxygen fugaci…
View article: Hydrogen mobility in forsterite re-evaluated in the framework of diffusion coupled to inter-site reaction
Hydrogen mobility in forsterite re-evaluated in the framework of diffusion coupled to inter-site reaction Open
View article: Variability of hydrogen defects in mantle orthopyroxene along a back-arc transect in Southern Patagonia
Variability of hydrogen defects in mantle orthopyroxene along a back-arc transect in Southern Patagonia Open
View article: New Ti-in-quartz diffusivities reconcile natural Ti zoning with time scales and temperatures of upper crustal magma reservoirs: REPLY
New Ti-in-quartz diffusivities reconcile natural Ti zoning with time scales and temperatures of upper crustal magma reservoirs: REPLY Open
View article: Explaining the dependence of M-site diffusion in forsterite on silica activity: a density functional theory approach
Explaining the dependence of M-site diffusion in forsterite on silica activity: a density functional theory approach Open
View article: Assessing analytical convolution effects in diffusion studies: Applications to experimental and natural diffusion profiles
Assessing analytical convolution effects in diffusion studies: Applications to experimental and natural diffusion profiles Open
Given that all in-situ analytical techniques have a non-zero beam size, all measured profiles, resulting from diffusion or otherwise, will be artefactually elongated to some degree. Profiles where the total length over which the concentrat…
View article: An eruption chronometer based on experimentally determined H-Li and H-Na diffusion in quartz applied to the Bishop Tuff
An eruption chronometer based on experimentally determined H-Li and H-Na diffusion in quartz applied to the Bishop Tuff Open
View article: Structure and theoretical infrared spectra of OH defects in quartz
Structure and theoretical infrared spectra of OH defects in quartz Open
The infrared spectra of natural quartz, and synthetic quartz produced in conditions relevant to natural environments, generally contain some association of OH-stretching absorption bands at 3596, 3585, 3483, 3431, 3379 and 3313 cm−1, and/o…