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Decorated dislocations and (HR-)EBSD data from olivine of the Oman-UAE ophiolite

This dataset is supplemental to the paper Wallis et al. (2021) and contains data on dislocations and their stress fields in olivine from the Oman-UAE ophiolite measured by oxidation decoration, electron backscatter diffraction (EBSD) and high-angular resolution electron backscatter diffraction (HR-EBSD). The datasets include images of decorated dislocations, measurements of lattice orientation and misorientations, densities of geometrically necessary dislocations, and heterogeneity in residual stress. Data are provided as 6 TIF files, 8 CTF files, and 37 tab-delimited TXT files. Files are organised by the figure in which the data are presented in the main paper. Data types or sample numbers are also indicated in the file names.

Mineral spectra and chemistry of 20 copper bearing minerals

The data set contains mineral chemical analyses of 20 different copper bearing minerals and their corresponding hyperspectral spectra. The hyperspectral data were acquired with the HySpex system in a range of 400 – 2500 nm and are presented in a spectral library. Detailed information about the mineral specimen, sample area and geochemistry is presented in the data sheets and associated data description. The spectral library presented here is part of a bigger collection of spectral libraries including samples from rare-earth minerals, rare-earth-oxides (Koerting et al., 2019a, http://doi.org/10.5880/GFZ.1.4.2019.004) and field samples from a copper-gold-pyrite mine in the Republic of Cyprus (Koerting et al., 2019b, http://doi.org/10.5880/GFZ.1.4.2019.005).

Development of a software tool to determine the number concentration for agglomerates and primary particles from nanomaterials at the workplace

Validated methods and strategies for measurement of nanomaterials are crucial for monitoring the effectiveness of workplace controls. A software tool will developed to count and analyse the concentration of agglomerates and primary particles of nanomaterials on digital scanning electron microscope (SEM) pictures sampled by a thermal precipitator.

Results of evolved gas analysis (EGA) on ash + salt samples from the 15 January 2022 eruption of Hunga volcano, Tonga

These data files contain the results of Evolved Gas Analysis (EGA) on a Mettler-Toledo TGA-DSC 3+ attached to a Pfeiffer Vacuum GSD 320 gas mass spectrometer on ash samples from the 15 January 2022 eruption of Hunga volcano, Tonga. Samples were heated in Nitrogen at a rate of 5 °C/min from 30 to 150 °C for dehydration purposes and then at a rate of 30 °C/min from 150 °C to 1300 °C. During heating, the relative amount of different volatile species (H2O, CO2, SO2, HCl, and H2S, which are extracted from mass-to-charge ratios of 18, 44, 64, 36, and 34, respectively) were recorded by the gas mass spectrometer. Natural samples collected for the analysis were bulk ash material or correspond to a given ash fraction. Particles were unwashed and dried at 40°C before analysis. We compared the signals for natural samples with (i) a mixture of salt-free dense glassy particles, white and dark pumice (HT10), (ii) pure halite, anhydrite, gypsum, calcite and pyrit, (iii) mix between pure magmatic particles (HT10) from (i) and manually added components from (iii).

Mechanical and microstructural data used in: “Inelastic deformation of the Slochteren sandstone: Stress-strain relations and implications for induced seismicity in the Groningen gas field"

Pore pressure reduction in sandstone reservoirs generally leads to small elastic plus inelastic strains. These small strains (0.1 – 1.0% in total) may lead to surface subsidence and induced seismicity. In current geomechanical models, the inelastic component is usually neglected, though its contribution to stress-strain behaviour is poorly constrained.To help bridge this gap, we performed deviatoric and hydrostatic stress-cycling experiments on Slochteren sandstone samples from the seismogenic Groningen gas field in the Netherlands. We explored in-situ conditions of temperature (T = 100°C) and pore fluid chemistry, porosities of 13 to 26% and effective confining pressures (≤ 320 MPa) and differential stresses (≤ 135 MPa) covering and exceeding those relevant to producing fields. The findings of our work are outlined in the corresponding paper. The data presented here are the measured mechanical tabular data and microstructural data (stitched mosaic of backscatter electron images) provided as uncompressed jpg images. In addition, for one sample we include chemical element maps obtained through Electron Dispersive X-ray spectrometry (EDX).

Experimental rock physics for the calibration of seismic-data interpretation: The case of the borehole Humilly-2 (France) in the Geneva area

This dataset is associated with the publication of Hefny, M., et al. (2020) A laboratory approach for the calibration of seismic data in the western part of the Swiss Molasse Basin: the case history of well Humilly-2 (France) in the Geneva area”. It includes data on mineralogical composition and experimental ultrasonic waves velocity measurements. It contains also seismic parameters calculated for the above-mentioned data. The measurements were performed as part of a database collection (SAPHYR) under the umbrella of the Swiss Commission of Geophysics (SGTK) and a project of the Canton of Geneva (GEothermie 2020), implemented by Services Industriels de Genève (SIG) for geothermal energy development (Moscariello 2019).

Planktonic Foraminiferal Mg/Ca as Indicator of Seawater Carbonate-Ion Saturation

Understanding how the carbonate-saturation state of seawater affects the geochemistry of foraminiferal tests is still in an elementary phase. Our primary goals are to investigate how dissolution affects the primary stable oxygen isotope and Mg/Ca signals in eight shallow-, thermocline-, and deep-dwelling planktonic foraminifera from 47 sediment-surface samples of the South China Sea. Using an integrated approach (Mg/Ca ratios, ä18O values, test weights, scanning-electron micrographs), we will determine the onset of partial dissolution with depth and quantify the dissolution bias in Mg/Ca ratios in relation to changes in the carbonate-ion concentration of bottom waters. Our work will also provide an opportunity to evaluate the sensitivity of Mg/Ca ratios as a proxy for seawater corrosiveness and assess the applicability for past climate reconstructions.

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