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46 results for “Olivine”
pyMelt_MultiNest inversion files for Nekrylov et al. "Magmatic evolution along the Emperor-Hawaiian seamount chain revealed by olivine-hosted melt inclusions"
<p>pyMelt_MultiNest inversion data collected for Nekrylov et al. "Magmatic evolution along the Emperor-Hawaiian seamount chain revealed by olivine-hosted melt inclusions"</p>
Constitutive behavior of olivine gouge across the brittle-ductile transition
<p>The bottom of the lithosphere is characterized by a thermally controlled transition from brittle to ductile deformation. While the mechanical behavior of rocks firmly within the brittle and ductile regimes is relatively well understood, how the transition operates remains elusive. Here, we study the mechanical properties of pure olivine gouge from 100 to 500ºC under 100 MPa pore-fluid pressure in a triaxial deformation apparatus as a proxy for the mechanical properties of the upper mantle across the brittle-ductile transition. We describe the mechanical data with a rate-, state-, and temperature-dependent constitutive law with multiple thermally activated deformation mechanisms. The stress power exponents decrease from 70±10 in the brittle regime to 17±3 and 4±2 in the semi-brittle and ductile regimes, respectively. The mechanical model consistently explains the mechanical behavior of olivine gouge across the brittle-ductile transition, capturing the gradual evolution from cataclasis to crystal plasticity.</p>
Research data supporting for "Characterization of recovery onset by subgrain and grain boundary migration in experimentally deformed polycrystalline olivine"
<p>Abstract: To apprehend plate tectonics and the dynamics of the lithosphere–asthenosphere boundary, composed principally of olivine, we need to understand the mechanisms that control plastic deformation of olivine in the relevant temperature domain. After more than 50 years of laboratory studies and investigations on natural rocks, the interplay of several key parameters (e.g. temperature, pressure, vacancy concentration, dislocation densities, grain size, strain rate) controlling polycrystalline olivine plasticity remains difficult to assess. Here, we study four olivine polycrystals, which have been deformed in axial compression under a confining pressure of 300MPa, at 1273 or 1473 K. Despite significant differences in mechanical properties (stress–strain curves), previous characterization by scanning (SEM) and transmission electron microscopy (TEM) did not reveal significant differences in dislocation microstructures which could explain these contrasted behaviours. We have undertaken automatic crystallographic orientation mapping (ACOM) analyses in TEM to increase the spatial resolution of characterization compared to previously obtained electron backscatter diffraction maps to further decipher the microstructures at nanoscale. With this novel technique applied to olivine, a noticeable difference in the onset of microstructural recovery has been identified between specimens deformed at 1273 and 1473 K. The microstructures of the olivine polycrystals deformed at 1473K exhibit numerous curved grain and subgrain boundaries, advocating for recovery by boundary migration. In contrast, the microstructures of the olivine polycrystals deformed at 1273K have significantly fewer subgrain boundaries and show more straight boundaries (i.e. closer to an equilibrium microstructure) than in the specimen deformed at 1473 K. Characterization by ACOM-TEM has permitted the identification of the onset of recovery, which is led by boundary migration even for very low macroscopic finite strains.</p> <p> </p>
Text-fig. 19. Geological position of the flora of Roudníky in the cores Ru 43 and Ru 60 and radiometric dating (from Bellon et al. 1998, adapted). 1 – xenolites intercalated with claystone, 2 – claystone, 3 – pyroclastite, 4 – tuffaceous claystone, 5 – olivine basalt, 6 – Quaternary cover. in Mid-Latitude Palaeogene Floras Of Eurasia Bound To Volcanic Settings And Palaeoclimatic Events - Experience Obtained From The Far East Of Russia (Sikhote-Alin') And Central Europe (Bohemian Massif)
Text-fig. 19. Geological position of the flora of Roudníky in the cores Ru 43 and Ru 60 and radiometric dating (from Bellon et al. 1998, adapted). 1 – xenolites intercalated with claystone, 2 – claystone, 3 – pyroclastite, 4 – tuffaceous claystone, 5 – olivine basalt, 6 – Quaternary cover.
Geochemistry and petrography of martian meteorite Northwest Africa 11115: A rare earth element-enriched olivine-phyric shergottite closely linked to Northwest Africa 1068
<p>This is the Electronic Appendix of the manuscript "<strong>Geochemistry and petrography of martian meteorite Northwest Africa 11115: A rare earth element-enriched olivine-phyric shergottite closely linked to Northwest Africa 1068</strong>", by M. Melwani Daswani, N. Greber, J. Hu, R. C. Greenwood, and P. R. Heck, submitted to <em>Meteoritics & Planetary Science</em>.</p> <p>Corresponding author: M. Melwani Daswani (daswani@jpl.caltech.edu)</p> <p>The compressed folder contains two files:</p> <p>1) <strong>NWA11115_CT_scan_TIFF_substack.tif</strong></p> <p>This is a TIFF image stack of the CT scan of the full NWA 11115 sample. Open in a program such as ImageJ (Rasband, W.S., ImageJ, U. S. National Institutes of Health, Bethesda, Maryland, USA, <a href="https://imagej.nih.gov/ij/">https://imagej.nih.gov/ij/</a>, 1997-2018).</p> <p>2) <strong>NWA11115_CT_scan_60FPS_JPEG.avi</strong></p> <p>This is a video file of the CT scan of the same NWA 11115 sample. The TIFF stack was converted to a video file (.avi), compressed to JPEG quality, and at a rate of 60 frames per second. Open this file with software such as VLC (<a href="https://www.videolan.org/vlc/">https://www.videolan.org/vlc/</a>).</p> <p> </p> <p><strong>Acknowledgements</strong></p> <p>The authors acknowledge T. Boudreaux for donating NWA 11115 to the Field Museum, J. Greer and J. Holstein for help with sample preparation, L. Kööp and B. Strack for SEM support, S. Rastegar for preliminary SEM analysis, L. Dussubieux for LA-ICP-MS support, A. I. Neander and Z.-X. Luo for CT scanning and support, and J. Filiberto and A. Treiman for useful discussions. We thank Thomas Pettke for assistance with LA-ICP-MS analyzes of the pressed powder pellets at the University of Bern. GPS Division analytical facilities at Caltech and Chi Ma are thanked for the support on EMPA analysis. PRH acknowledges support from the Tawani Foundation. MMD’s portion of the work was done partly as a private venture and not in the author’s capacity as an employee of the Jet Propulsion Laboratory, California Institute of Technology. The authors declare no competing interests.</p> <p>EOF</p>
An experimental study of proton implantation in olivine
<p>This repository contains all NRRA analyses that were used in the related publication DOI: 10.1007/s00269-023-01234-9. </p> <p>The filenames contain the following information:<br> "sample_#implantation_fluence(at/cm²)_energy(keV)"</p> <p><br> There are two file types per measurement which are <br> (i) a .dat file that contains 4 columns that are, from left to right: beam energy (MeV), Hydrogen Concentration (at%), Uncertainty in Hydrogen Concentration (at%), and accumulated beam charge (microColoumb). .dat files can be opened using any text editor or Excel.<br> (ii) a pdf file that contains an overview of the measurement parameters and a plot of the resulting depth profiles.</p>
From Electron Tomography of Dislocations to Field Dislocation Mechanics: application to olivine
<p>Aligned and numerically filtered tilt-series of the PoEM9 specimen (double-tilt sample-holder + weak-beam dark-field conditions + precession angle = 0.1°+ objective aperture = 20 micron):</p> <p>Tilted-series 1: Projection angles from -48° to 52° every 2° (from image 01.tif to 51.tif)</p> <p>Tilted-series 5: Projection angles from -56° to 50° every 2° (from image 01.tif to 54.tif)</p>
Supplementary data to 'The origin and differentiation of CO2-rich primary melts in Ocean Island volcanoes: Integrating 3D X-ray tomography with chemical microanalysis of olivine-hosted melt inclusions from Pico (Azores).'
<p>Supplementary data to:</p><blockquote><p>The origin and differentiation of CO2-rich primary melts in Ocean Island volcanoes: Integrating 3D X-ray tomography with chemical microanalysis of olivine-hosted melt inclusions from Pico (Azores).</p></blockquote>
Metasomatic reactions between Archean dunite and trondhjemite at the Seqi Olivine Mine in Greenland
<p>Supplementary materials relating to the paper: Metasomatic reactions between Archean dunite and trondhjemite at the Seqi Olivine Mine in Greenland by Wyatt et al.</p>
Compilation of experimental data on water storage capacity in olivine, wadsleyite and ringwoodite (061721 updated)
<p>We compiled high-pressure mineral physics data on water storage capacities in olivine, wadsleyite, and ringwoodite from the literature (published as Tables S1–S3 in Dong et al., 2021). The references are listed in the second tab of each xlsx file.</p> <p>This version was published on Oct. 21, 2020 (version 1.0) and includes "data-olivine-table-s1.xlsx", "data-wadsleyite-table-s2.xlsx", and "data-ringwoodite-table-s3.xlsx"</p> <p>Please cite "Dong, J., Fischer, R. A., Stixrude, L. P., & Lithgow‐Bertelloni, C. R. (2021). Constraining the Volume of Earth's Early Oceans With a Temperature‐Dependent Mantle Water Storage Capacity Model. <em>AGU Advances</em>, <em>2</em>(1), e2020AV000323." for the dataset version 1.0.</p> <p><strong>An update to the data compilation of Dong et al. (2021) (version 1.0) is now published as version 2.0 on Jun. 17, 2021, and includes additional literature data on the water storage capacity in olivine, wadsleyite, and ringwoodite ("additional-data-for-mars-061721.xlsx")</strong></p>
Supplementary data supporting "3D diffusion of water in melt inclusion-bearing olivine phenocrysts"
<p>Supplementary_DataS1</p><p>Secondary Ion Mass Spectrometry (SIMS) data of water concentrations in olivine crystals from the 1977 Seguam eruption used in this study. Electron probe microanalyser (EPMA) data of major elements and crystal orientations from electron backscatter diffraction (EBSD) are also included.</p><p>Supplementary_DataS2</p><p>Model inputs and outputs for the Monte Carlo diffusion modelling used in this study for water loss from a melt inclusion during magma decompression. Spreadsheet includes water loss estimated by 3D, 2D and 1D numerical models in addition to the anisotropic analytical solution. It also includes the inverted decompression rates from the 2D, 1D and analytical models.</p>
Adsorption of Neutral and Charged S-Bearing Species onto Olivine Nanoclusters
<p>The Supporting Material contains the cartesian coordinates of optimized minima and transition state for the reaction studied in the paper, in .xyz format, computed using <a href="https://gaussian.com/">O</a><a href="https://orcaforum.kofo.mpg.de/">RCA</a> code. The folders are relative to:</p> <ul> <li>structures of the first benchmark, optimized at 𝜔B97M-V/def2-TZVP level of theory;</li> <li>structures of the second benchmark, optimized at B3LYP-D3(BJ), 𝜔B97M-V and r2SCAN-3c levels of theory, plus NEB structures at 𝜔B97M-V level;</li> <li>adsorption of H2O, H2S, CO and CS on forsterite, cluster A and cluster B at 𝜔B97M-V/def2-TZVP level of theory:</li> <li>adsorption of the 9 S-bearing species on cluster C at 𝜔B97M-V/def2-TZVP level of theory.</li> </ul>
Data from: Production of low-carbon amorphous precipitated silica and hydrated magnesium carbonate from olivine
<p>A novel process is reported that produces amorphous silica and nesquehonite (MgCO<sub>3</sub>.3H<sub>2</sub>O) from the magnesium silicate mineral olivine ((Mg,Fe)<sub>2</sub>.SiO<sub>4</sub>). The amorphous silica formed is a supplementary cementitious material (SCM) for use in concrete. The formation of nesquehonite sequesters carbon and means that the overall process is carbon negative. Nesquehonite can also be used to form low-carbon construction products such as bricks, blocks, and boards. This paper reports on key process optimisation studies. The potential for amorphous precipitated silica derived from olivine to produce carbon-negative concrete is discussed.</p>
Data for the research article "High-Temperature Deformation of Enstatite-Olivine Aggregates" published in JGR Solid Earth
<p>The data available in this repository is the original data presented in the research article: Bystricky, M., Lawlis, J., Mackwell, S., & Heidelbach, F. (2024). High-temperature deformation of enstatite-olivine aggregates, Journal of Geophysical Research: Solid Earth, 129, e2023JB027699. https://doi.org/10.1029/2023JB027699.</p> <p>Version v1: data at time of original submission (2023)</p> <p>Version v2: data at time of publication (2024)</p>
Raw data and MTEX script for the article : "Quantification of grain boundary mobilities in natural olivine by annealing experiments and full-field modelling"
<p>This dataset contains the EBSD (.ctf) files of the different sample areas analyzed in the article : "Quantification of grain boundary mobilities in natural olivine by annealing experiments and full-field modelling" by J. Furstoss, S. Demouchy, A. Tommasi, E. Gardès, F. Barou and N. Marino, which is expected to be published in Tectonophysics. This repository also contains the Analyze.m MTEX script which has been used for the post-processing of the EBSD files. This script has to be run in matlab and outputs different figures and .csv files containing the raw data used in the article. For any questions please contact jfurstoss@orange.fr </p>
Olivine mineral chemistry compilation
<p>Compilation of published data on major and minor element concentrations in volcanic and plutonic olivines including global magmatic nickel-copper sulfide orebodies. Electron microprobe analyses only. Associated with publication by Barnes et al., 2022, American Mineralogist, in press. </p>
Supplementary Datasets for 'Exploring rift geodynamics in Ethiopia through olivine-spinel Al-exchange thermometry and rare-earth element distributions'
<p>Supplementary Datasets for 'Exploring rift geodynamics in Ethiopia through olivine-spinel Al-exchange thermometry and rare-earth element distributions'.</p> <p>Dataset S1: Qualitative X-ray maps of Mg, Ca, Al, Ni, P in olivine-spinel pairs.<br> Dataset S2: Quantitative EPMA point analyses of olivine and spinel. Includes Sheet 1: Secondary standards; Sheet 2: Sample data.<br> Dataset S3: Full inversion outputs from MultiNest.</p>
Olivine Phenocryst morphology with glass and mineral inclusions
<p>The x-ray micro computed-tomography (micro-CT) model of this olivine crystal was acquired on a 2010 GE phoenix v|tome|x s240 system using a 180 KV nanofocus transmission X-ray tube. The olivine was placed in a low density polyethylene pipette. To achieve the smallest voxel size (nominally 1.1 µm), the sample was placed as close to the x-ray source as possible without collision (<1mm). In preliminary scans, we determined that the sample was blurring due to thermal expansion from the X-ray source. To combat this we placed the sample in the X-ray beam ~30 minutes prior to acquiring images so that a steady state could be reached. To further reduce image blur and ensure a crisp x-ray images the primary electron beam was manually focused immediately prior to data acquisition. A low accelerating voltage (40 kV) and molybdenum x-ray target was chosen to enhance compositional contrast in the x-ray images. Detector acquisition timing (333 ms per image), and X-ray source current (325 µA) was optimized to reduce image noise in the densest part of the image while ensuring a total acquisition time under 1 hour. A thin (0.1 mm) copper filter was placed in front of the x-ray beam to attenuate the beam hardening effects of polychromatic x-ray sources in CT images. For each image used in the tomographic reconstruction four images were averaged to reduce signal noise. A total of 1200 images were acquired for the tomographic reconstruction, resulting in an angular step size of 0.3˚. X-ray images were reconstructed into computed tomography volumes using GE Phoenix Datos software (version 2.3.2), a median kernel filter (3x3) was applied to the images prior to reconstruction to reduce signal noise, a beam hardening correction was applied to reduce artifacts in the Feldkamp cone beam reconstruction algorithm. Volumetric data was segmented and animated using Volume Graphics VG Studio Max 3.4 as well as the Fiji distribution of ImageJ.</p> <p>The olivine grain is from the terminal scoria deposits of the 1932 eruption of Volcán Quizapu, Chile. The grain demonstrates the complexities associated with studying olivine (green) and its inclusions (here melt inclusion (dark red) with vapor bubble (teal) and oxide inclusion (yellow)). The olivine is partially enclosed in silicate glass (gray) and adhering plagioclase (white) crystals. This model shows the morphology of this olivine crystal that includes subgrains and melt channels (often referred to as embayments or re-entrants) that connect from the outside of the grain and extend into the grain’s center.</p>
Supplemental Dataset: Seismological evidence for girdled olivine lattice-preferred orientation in oceanic lithosphere and implications for mantle deformation processes during seafloor spreading
<p>This repository contains supplementary datasets for the manuscript titled "Seismological evidence for girdled olivine lattice-preferred orientation in oceanic lithosphere and implications for mantle deformation processes during seafloor spreading", published in G-Cubed. All files are Microsoft Excel tables containing olivine fabric data.</p> <p>ds01_strain_data_ol60.xlsx: Anisotropy magnitude and fast directions for sample data shown in Figure 3 of the main text, assuming 60% olivine and 40% pyroxene (see methods for details).</p> <p>ds02_strain_data_ol100.xlsx: Anisotropy magnitude and fast directions for sample data shown in Figure 3 of the main text, assuming pure olivine.</p> <p>ds03_fabric_data_ol75.xlsx: Anisotropy fabric data shown in Figure 5 of the main text, assuming 75% olvine and 25% pyroxene (see methods for details).</p> <p>ds04_fabric_data_ol100.xlsx: Anisotropy fabric data shown in Figure 5 of the main text, assuming pure olivine.</p> <p> </p>
Spectral effects of regolith porosity in the mid-IR - Forsteritic olivine
<p>This dataset contains laboratory spectra of olivine in the mid-Infrared (MIR; 5-35 micron) wavelength region as described in Martin et al., 2022. </p> <p>Files are labeled accordingly: mineral_largest particle size_regolith porosity</p> <p>Example: The file labeled OLV1_45_10.txt contains spectra of olivine (OLV1 in the paper), with 20-45 micron particle sizes, has 10% regolith porosity. </p>
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