Preprints

Filtering by Subject: Mineral Physics

Grüneisen parameter formalism in the study of the Earth's core formation: a sensitivity study

Vincent Clesi, Renaud Deguen

Published: 2024-03-21
Subjects: Condensed Matter Physics, Earth Sciences, Geochemistry, Geology, Mineral Physics, Other Earth Sciences, Planetary Geophysics and Seismology, Planetary Mineral Physics, Planetary Sciences

The Grüneisen parameter is an important parameter for the thermal state and evolution of the core, but its uncertainties and their implications are sometimes overlooked . Several formalisms using different parameters values have been used in different studies, making comparison between studies difficult. In this paper, we use previously published datasets to test the sensitivity of modeling the [...]

Three-dimensional mineral dendrites reveal a non-classical crystallization pathway

Zhaoliang Hou, Dawid Woś, Cornelius Tschegg, et al.

Published: 2024-03-04
Subjects: Earth Sciences, Fluid Dynamics, Geochemistry, Mineral Physics, Physical Sciences and Mathematics, Physics

Manganese (Mn) dendrites are a common type of mineral dendrite that typically forms two-dimensional structures on rock surfaces. Three-dimensional (3D) Mn dendrites in rocks have rarely been reported, hence their growth implications have largely escaped attention. Here, we combine high-resolution X-ray and electron-based data with numerical modelling to give the first detailed description of [...]

Excited state lifetime of electron trapping centres in alkali feldspars

Svenja Riedesel, Mayank Jain

Published: 2023-11-03
Subjects: Earth Sciences, Mineral Physics, Other Earth Sciences, Physical Sciences and Mathematics, Physics

The development of the infrared photoluminescence (IRPL) signal enables the direct non-destructive probing of the trapped electron population in feldspars. Whilst IRPL offers new perspectives for luminescence dating, it also enables detailed, site-selective measurements of the dosimetric defects emitting IRPL at 880 nm (IRPL880) and 955 nm (IRPL955), allowing improved understanding of [...]

A key role for diffusion creep in eclogites: Omphacite deformation in the Zermatt-Saas Unit, Italian Alps

David Daniel McNamara, John Wheeler, Mark Pearce, et al.

Published: 2023-04-18
Subjects: Earth Sciences, Geochemistry, Geology, Mineral Physics, Tectonics and Structure

Eclogites are important components of subduction-collision zones, with the mineral omphacite acting as the supporting framework mineral that accommodates the majority of any accumulated strain. As such it is important to determine which deformation mechanisms operate in omphacite during and after its formation to understand the rheology of deforming subducted crust. Such information is key to [...]

Examining the power supplied to Earth's dynamo by magnesium precipitation and radiogenic heat production

Alfred Wilson, Monica Pozzo, Chris Davies, et al.

Published: 2023-04-06
Subjects: Earth Sciences, Geophysics and Seismology, Mineral Physics, Physical Sciences and Mathematics, Planetary Sciences

We examine magnesium and potassium solubility in liquid Fe mixtures, representative of Earth’s core composition, in equilibrium with liquid silicate mixtures representative of an early magma ocean. Our study is based on the calculation of the chemical potentials of MgO and K2O in both phases, using density functional theory. For MgO, we also study stability against precipitation of the solid [...]

Compressibility of ferropericlase at high-temperature: evidence for the iron spin crossover in seismic tomography

Viktoria Elisabeth Trautner, Stephen Stackhouse, Alice Turner, et al.

Published: 2023-04-06
Subjects: Earth Sciences, Geophysics and Seismology, Mineral Physics

The iron spin crossover in ferropericlase, the second most abundant mineral in Earth’s lower mantle, causes changes in a range of physical properties, including seismic wave velocities. Understanding the effect of temperature on the spin crossover is essential to detect its signature in seismic observations and constrain its occurrence in the mantle. Here, we report the first experimental results [...]

DiadFit: An Open-Source Python3 Tool for Peak fitting of Raman Data from silicate melts and CO2 fluids

Penny E Wieser, Charlotte L DeVitre

Published: 2023-04-04
Subjects: Earth Sciences, Geology, Mineral Physics, Physical Sciences and Mathematics, Volcanology

We present DiadFit - an open-source Python3 tool for efficient processing of Raman spectroscopy data collected from fluidinclusions, melt inclusions and silicate melts. DiadFit is optimized to fit the characteristic peaks from CO2 fluids (Fermi diads,hot bands, 13C), gas species such as SO2, N2, solid precipitates (e.g., carbonates), and Ne emission lines with easily tweakablebackground positions [...]

Can homogeneous nucleation resolve the inner core nucleation paradox?

Alfred Wilson, Dario Alfè, Andrew Walker, et al.

Published: 2023-03-25
Subjects: Condensed Matter Physics, Earth Sciences, Geophysics and Seismology, Mineral Physics, Planetary Geophysics and Seismology, Planetary Mineral Physics

Barometers behaving badly: Assessing the influence of analytical and experimental uncertainty on clinopyroxene thermobarometry calculations at crustal conditions

Penny E Wieser, Adam J Kent, Christy Till, et al.

Published: 2022-12-01
Subjects: Earth Sciences, Geochemistry, Geology, Mineral Physics, Volcanology

The composition of clinopyroxene and Clinopyroxene-Liquid (Cpx-Liq) pairs are frequently used to calculate crystallization/equilibration pressures in igneous systems. While canonical uncertainties are often assigned to calculated pressures based on fits to calibration or test datasets, the sources of these uncertainties (and thus ways to reduce them) have not been rigorously assessed. We show [...]

Comparative study of alteration sequences in pegmatitic aluminium phosphates

Cassian P. F. Pirard

Published: 2022-09-29
Subjects: Earth Sciences, Geochemistry, Geology, Mineral Physics, Other Earth Sciences

Aluminium phosphates are mineral phases commonly occurring in rare-element pegmatites that record initial magmatic crystallization, metasomatic and hydrothermal replacements and precipitation and low-temperature alteration. Here we perform a comparative mineralogical study between several localities to assess similarities and variations in these parageneses and establish a general alteration [...]

Characterisation of phosphate mineralogy in Montebras-en-Soumans Pegmatite, Massif Central, France

Cassian P. F. Pirard

Published: 2022-09-22
Subjects: Earth Sciences, Geochemistry, Geology, Mineral Physics

Montebras-en-Soumans pegmatitic cupola hosts large pods of phosphate composed of primary amblygonite-montebrasite. These aluminium phosphate masses are considerably altered by post-magmatic processes producing a number of secondary metasomatic hydrothermal phosphates (lacroixite, wardite, morinite, viitaniemiite, apatite, triplite, eosphorite) and low-temperature phosphates (apatite, crandallite, [...]

Time-resolved infrared stimulated luminescence of the blue and yellow-green emissions – insights into charge recombination in chemically and structurally different alkali feldspars

Svenja Riedesel, Geoff A.T. Duller, Christina Ankjærgaard

Published: 2022-08-24
Subjects: Earth Sciences, Mineral Physics

Time-resolved luminescence measurements can be used to explore luminescence processes in minerals and the defects involved. It has also been applied to feldspars and knowledge has been gained regarding potential crystal defects associated with luminescence productions in these minerals, but also regarding processes governing electron-hole recombination leading to luminescence emission. Here we [...]

Probabilistic Assessment of Antarctic Thermomechanical Structure: Impacts on Ice Sheet Stability

James Alexander Nicholas Hazzard, Fred D. Richards, Saskia Goes, et al.

Published: 2022-05-20
Subjects: Earth Sciences, Geophysics and Seismology, Mineral Physics, Physical Sciences and Mathematics, Statistical Methodology

Uncertainty in present-day glacial isostatic adjustment (GIA) rates represents at least 44% of the total gravity-based ice mass balance signal over Antarctica. Meanwhile, physical couplings between solid Earth, sea level and ice dynamics enhance the dependency of the spatiotemporally varying GIA signal on three-dimensional variations in mantle rheology. Improved knowledge of thermomechanical [...]

CCC - integrated multiscale study of salt cavern abandonment in the Netherlands

Tobias S. Baumann, Pierre Bérest, Benoit Brouard, et al.

Published: 2022-03-25
Subjects: Geology, Geophysics and Seismology, Materials Science and Engineering, Mineral Physics, Mining Engineering, Other Earth Sciences, Tectonics and Structure

The KEM-17 project of the Dutch State Supervision of Mines presented a critical review of concepts of cavern abandonment and related science. It recommended that analyses of cavern abandonment are done as an integrated project, addressing (i) micro-scale physical processes, (ii) cavern scale models based on field scale experiments and numerical models, (iii) the salt dome scale, to model the far [...]

Thermochemical structure and evolution of cratonic lithosphere in central and southern Africa

Juan Carlos Afonso, Walid Ben Mansour, Suzanne Y O’Reilly, et al.

Published: 2021-12-11
Subjects: Earth Sciences, Geochemistry, Geophysics and Seismology, Mineral Physics, Physical Sciences and Mathematics, Tectonics and Structure

The thermochemical structure of the subcontinental mantle holds information on its origin and evolution that can inform energy and mineral exploration strategies, natural hazard mitigation and evolutionary models of the Earth. However, imaging the fine-scale thermochemical structure of continental lithosphere remains a major challenge. Here we combine multiple land and satellite datasets via [...]

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