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167 results for “granite”
Progressive Weakening of Granite via Piezoelectric Excitation of Quartz with Alternating Current: Experimental Dataset
<p><strong>Summary:</strong></p> <p>This article shares experimental data evidencing alternating-current (AC) induced weakening of Kuru granite specimens. This work reports the mechanical data of dynamic and quasi-static Brazilian Disc (BD) tensile tests. The dynamic BD tensile tests were performed in Split Hopkinson Pressure Bars (SHPB). Additionally, X-Ray Phase Contrast Imaging (XPCI) was used to evidence the fragmentation of BD samples loaded dynamically, and the resulting images are presented in this work in the form of videos. The original data used to attain the fragmentation videos of the BD specimens is available at https://doi.esrf.fr/10.15151/ESRF-ES-962080191. The dataset reported in this Zenodo publication corresponds to the study conducted by Rubio Ruiz et al. (2024). </p> <p><strong>Specimen Segmentation:</strong></p> <p>The granite specimens in this dataset are categorised into three distinct groups:</p> <p>1. Treated-Wet: Specimens subjected to high-voltage alternating current (HV-AC) treatment with direct exposure to dielectric fluid.</p> <p>2. Treated-Dry: Specimens subjected to HV-AC treatment without direct exposure to dielectric fluid.</p> <p>3. Non-Treated-Dry: Specimens that have not undergone any treatment and have not been exposed to dielectric fluid.</p> <p><strong>Included data:</strong></p> <p><strong>Quasi-static and Dynamic Brazilian Disc Test Results:</strong> The dataset consists of mechanical data obtained from dynamic and quasi-static Brazilian disc tests of each specimen type mentioned above. The data of the dynamic tests includes MATLAB figures (in .fig format), which display stress plotted against time. In addition, this dataset includes figures (in .fig format) depicting stress plotted against the dimensionless displacement parameter for both dynamic and quasi-static tests. This parameter is the ratio between the relative displacements of the loading bars and the specimen diameter.</p> <p><strong>Fragmentation Videos:</strong> This data set includes the XPCI-obtained videos capturing the fragmentation process of BD specimens in each specimen category.</p> <p><strong>References:</strong></p> <p>Rubio Ruiz RA, et al. (2024). Progressive weakening of granite by piezoelectric excitation of Quartz with alternating current. Rock Mechanics and Rock Engineering. https://doi.org/10.1007/s00603-024-03948-w</p> <p><strong>Funding: </strong></p> <p>This research was funded by the Research Council of Finland (grant number 340192) </p> <p><strong>Acknowledgements:</strong></p> <p>The authors acknowledge the European Synchrotron Radiation Facility (ESRF) for providing beamtime access at ID 19 beamline (Proposal MI-1397, within the Shock BAG project supported by the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 870313, Streamline). </p>
Dataset for manuscript Tracing Quartz Provenance: A Multi-Disciplinary Investigation of Luminescence Sensitisation Mechanisms of Quartz from Granite Source Rocks and Derived Sediments
<p><span>Quartz optically stimulated luminescence (OSL) sensitivity as well as some electron spin resonance (ESR) and cathodoluminescence (CL) signals have been empirically proposed as provenance indicators. Sensitivity is defined as luminescence emitted in response to a given dose per unit mass. While it is largely believed to be acquired by earth surface processes, recent studies bring evidence that sensitisation processes depend on source geology.</span></p> <p><span>Here we combine OSL and thermoluminescence (TL), ESR and CL analyses to understand the mechanisms of quartz OSL sensitisation. We investigate granites and their derived sediments from catchments draining simple lithologies of known age that display contrasting OSL sensitisation behaviour both in nature and during irradiation and light exposure laboratory experiments. The sample displaying increased OSL sensitisation is characterised by TL emission at intermediate temperatures (150-250 °C), Ti-related signals in CL, and Ti and Ge lithium compensated signals in ESR. <span>The insensitive samples either lack or exhibit very weak such characteristics and contain several times less amount of trace titanium measured by </span></span><span>laser ablation inductively coupled plasma mass spectrometry (</span><span>LA-ICP-MS).</span></p> <p><span>We demonstrate that the OSL sensitisation results as an effect of the existence of certain defects and impurities in the quartz crystal in the parent rock, such as titanium and germanium. However, the degree of sensitisation reached in nature is significantly higher than in the laboratory. <span> </span>As such, the existence of this precursor represents the potential for sensitisation, which can later be amplified by environmental factors during sedimentary history.</span></p>
Experimental data for fracture toughness analysis of sandstone and granite samples under fluid saturation conditions
<p>This database includes experimental results from mode I fracture toughness (KIC) tests conducted on saturated rock specimens. Three lithologies were studied: a porous siliceous sandstone (Corvio, C) and two high-strength, low-porosity granites (Blanco Mera, BM and Blanco Alba, BA). Tests were conducted at room pressure and temperature using the pseudo-compact tension (pCT) methodology. Seven different fluids were used: deionized water, methanol, NaCl-saturated water, mineral oil, diesel fuel, an acidic HCl solution, and a caustic NaOH solution.</p>
Mapping ecosystem types and land cover types in the Seychelles granitic islands, using Earth Engine and Sentinel-2
<p>We share here maps produced using Earth Engine: https://code.earthengine.google.com/?accept_repo=users/bsenterre/gis</p> <p>The maps include a land cover classification based on Sentinel-2, at 10m resolution, using an Object-Based Image Analysis approach, for the Seychelles granitic islands. Based on the land cover, landform (modeled using TauDEM), altitude and expert knowledge, we then derived a model of ecosystem types, with 3 maps: current distribution, potential distribution and prehuman distribution.</p> <p>A report exists (18th May 2022) that describes in detail the methodology, and it is being used for the preparation of a publication. The maps uploaded here are in raster format (geotif), crs=4326, and are accompanied by QGIS legend files (.qml), so they should load in QGIS with their legend automatically.</p>
CODEX Rb and Sr isotopic data of granites
<p>The files in this archive represent Rb and Sr isotopic compositions of hundreds of spot analyses on the Boulder Creek Granite and the Pikes Peak Granite. Data were acquired at the Southwest Research Institute in Boulder, Colorado, USA in July-August 2019, using the breadboard version of CODEX, the Chemistry, Organics, and Dating Experiment.</p> <p>The files are in plain text format. Following a one-row header that gives column headings, subsequent rows contain:<br> (1) A unique identifier for each spot analysis;<br> (2-4) 3 columns representing the position of the analysis spot (in mm) relative to a fiducial spot on the sample holder (this permits the construction of an isotopic map of the sample);<br> (5-7) the isotopic abundances for Rb87, Sr86, and Sr87 in units of V*ns, i.e., the product of peak height and duration;<br> (8-10) the 1-sigma uncertainties in each of those isotope abundances, in the same units;<br> (11-13) the correlation coefficients (dimensionless) between fluctuations in the isotope pairs (Rb-87,Sr-86), (Sr-86,Sr-87), (Rb-87,Sr-87). These are important because the uncertainties in the isotope abundances are strongly correlated with one another, making the uncertainties in their ratios smaller than the uncertainty in individual abundances might suggest; <br> (14-15) the ratio of Rb87/Sr86 and its 1-sigma uncertainty; <br> (16-17) the ratio of Sr87/Sr86 and its 1-sigma uncertainty; and<br> (18) the correlation coefficient between the Rb87/Sr86 ratio and the Sr87/Sr86 ratio.</p>
Climate data for Mojave National Preserve Granite Mountains 2019
Basic climate data derived from a local weather station. Mean and max temp with humidity relevant to avian abundance surveys conducted at that location during those specific time blocks.
Frictional properties of natural granite fault gouge under hydrothermal conditions: A case study of strike-slip fault from Anninghe Fault zone, southeastern Tibetan Plateau
<p>We performed friction experiments on natural granite gouge under hydrothermal conditions to investigate roles of the Anninghe Fault (ANHF) on seismogenesis in the continental crust. In this dataset, we report processed data after correction. Detailed information about the files in the zip-files is given in the explanatory file Lei-et-al-2023-Data-Description.pdf.</p>
Dataset for "Permeability development during fault growth and slip in granite"
<p>This is a dataset accompanying the publication entitled "Permeability development during fault growth and slip in granite" by F.M. Aben, A. Farsi, and N. Brantut (submitted). The dataset contains the data acquired during three rock deformation experiments (sample numbers WGMS2, WGMS3, WGMS4) on Westerly granite, and is comprised of:</p> <ul> <li>Notes of the experiments</li> <li>Mechanical data in .txt files, where the header indicates what the column's values are. The experiment name and phase are contained in the file names. </li> <li>Processed ultrasonic data in .jld2 format for experiment WGMS4</li> </ul> <p> </p>
Text-fig. 3. Borehole section in the Blansko Graben with lithology, distribution of palynomorphs, macroflora and macrofauna (modified after Čech, unpublished report). 1 – Spesovicornea pacltovae, 2 – Platanus sp., 3 – Myrtophyllum angustum (VEL.) KNOBOCH, 4 – Gleichenia sp.), 5 – percentage of land-derived palynomorphs, 6 – percentages of marine palynomorphs, 7 – glauconite, 8 – pyrite nodules, 9 – macrofauna, 10 – productive palynological samples, 11 – carbonized roots, 12 – conglomerate, 13 – sandstone, 14 – claystone, 15 – coal, 16 – granite and granodiorite of the Brno pluton. in Spesovicornea Pacltovae Gen. Nov. Et Sp. Nov., A New Elateroid Sporomorph From The Bohemian Cenomanian (Czech Republic)
Text-fig. 3. Borehole section in the Blansko Graben with lithology, distribution of palynomorphs, macroflora and macrofauna (modified after Čech, unpublished report). 1 – Spesovicornea pacltovae, 2 – Platanus sp., 3 – Myrtophyllum angustum (VEL.) KNOBOCH, 4 – Gleichenia sp.), 5 – percentage of land-derived palynomorphs, 6 – percentages of marine palynomorphs, 7 – glauconite, 8 – pyrite nodules, 9 – macrofauna, 10 – productive palynological samples, 11 – carbonized roots, 12 – conglomerate, 13 – sandstone, 14 – claystone, 15 – coal, 16 – granite and granodiorite of the Brno pluton.
Fig. 12 in Three new species of day geckos (Reptilia: Gekkonidae: Cnemaspis Strauch, 1887) from isolated granite cave habitats in Sri Lanka
Fig. 12. Threats to the isolated hill forests and Cnemaspis species in study areas in Sri Lanka. (A) Illegal forest clearing, (B) fire- wood collection for tea factory, (C) granite mining activities, (D) agricultural fields in slopy areas, (E) tea plantation and highly crowded anthropogenic habitat, and (F) a landslide in mountain areas. Photos: Suranjan Karunarathna and Madhava Botejue.
Fig. 11 in Three new species of day geckos (Reptilia: Gekkonidae: Cnemaspis Strauch, 1887) from isolated granite cave habitats in Sri Lanka
Fig. 11. General habitats of Cnemaspis kawminiae sp. nov. at Mandaramnuwara, Nuwara-Eliya District, Sri Lanka. (A) Complete view of the granite hill at roadside, (B) small granite cave close to the stream, and (C) granite rock wall along the road. Photos: Madhava Botejue.
Fig. 10 in Three new species of day geckos (Reptilia: Gekkonidae: Cnemaspis Strauch, 1887) from isolated granite cave habitats in Sri Lanka
Fig. 10. Holotype male of Cnemaspis kawminiae sp. nov. (NMSL 2018.18.01) in life in-situ. (A) Dorsal view of the full body, and (B) dorsolateral view with labial coloration. Photos: Madhava Botejue.
Fig. 8 in Three new species of day geckos (Reptilia: Gekkonidae: Cnemaspis Strauch, 1887) from isolated granite cave habitats in Sri Lanka
Fig. 8. General habitat of Cnemaspis dissanayakai sp. nov. at Dimbulagala isolated hill forest, Polonnaruwa District, Sri Lanka. (A) Complete view of the mountain, (B) abandoned ancient cave building in Kosgahaulpatha, and (C) deep and tall granite tunnel. Photos: Madhava Botejue and Ashan Geeganage.
Fig. 5 in Three new species of day geckos (Reptilia: Gekkonidae: Cnemaspis Strauch, 1887) from isolated granite cave habitats in Sri Lanka
Fig. 5. General habitat of Cnemaspis kotagamai sp. nov. at Bambaragala isolated forest hill, Ratnapura District, Sri Lanka. (A) Rock outcrop habitat, (B) abandoned cave building, and (C) deep and tall granite tunnel. Photos: Madhava Botejue.
Fig. 7 in Three new species of day geckos (Reptilia: Gekkonidae: Cnemaspis Strauch, 1887) from isolated granite cave habitats in Sri Lanka
Fig. 7. Holotype male of Cnemaspis dissanayakai sp. nov. (NMSL 2018.20.01) in life in-situ in Dimbulagala. (A) Dorsal view of the full body, and (B) ventral view with dirty white coloration. Photos: Suranjan Karunarathna.
Fig. 9 in Three new species of day geckos (Reptilia: Gekkonidae: Cnemaspis Strauch, 1887) from isolated granite cave habitats in Sri Lanka
Fig. 9. Holotype male of Cnemaspis kawminiae sp. nov. (NMSL 2018.18.01). (A) Dorsal head, (B) lateral head, (C) ventral head, (D) homogeneous dorsal scales, (E) scales on lateral surface of trunk, (F) smooth ventral scales, (G) cloacal characters with precloacal pores and femoral pores, (H) lamellae on manus, (I) lamellae on pes, (J) smooth dorsal scalation of tail, (K) lateral side of tail, and (L) very small subcaudals. Photos: Suranjan Karunarathna.
Fig. 4 in Three new species of day geckos (Reptilia: Gekkonidae: Cnemaspis Strauch, 1887) from isolated granite cave habitats in Sri Lanka
Fig. 4. Holotype male of Cnemaspis kotagamai sp. nov. (NMSL 2018.07.01) in life in-situ in Bambaragala. (A) Dorsal view of the full body, and (B) ventral view with scattered yellow coloration. Photos: Suranjan Karunarathna.
Fig. 6 in Three new species of day geckos (Reptilia: Gekkonidae: Cnemaspis Strauch, 1887) from isolated granite cave habitats in Sri Lanka
Fig. 6. Holotype male of Cnemaspis dissanayakai sp. nov. (NMSL 2018.20.01). (A) Dorsal head, (B) lateral head, (C) ventral head, (D) homogeneous dorsal scales, (E) scales on lateral surface of trunk, (F) smooth ventral scales, (G) cloacal characters with precloacal pores and femoral pores, (H) lamellae on manus, (I) lamellae on pes, (J) smooth dorsal scalation of tail, (K) lateral side of tail, and (L) very small smooth subcaudals. Photos: Suranjan Karunarathna.
Fig. 2 in Three new species of day geckos (Reptilia: Gekkonidae: Cnemaspis Strauch, 1887) from isolated granite cave habitats in Sri Lanka
Fig. 2. (A-F) PCA Ordination plots for multivariate morphometric analyses (all pairwise ordination plots for PC1 through PC4 are shown), (G) Scatter plot of PCA between Cnemaspis kotagamai sp. nov. (filled circles), Cnemaspis ingerorum (triangles), and Cnemaspis kallima (filled diamonds), (H) Scatter plot of PCA between Cnemaspis dissanayakai sp. nov. (circles), Cnemaspis latha (filled squares), and Cnemaspis kumarasinghei (stars), (I) Scatter plot of PCA between Cnemaspis kawminiae sp. nov. (squares), Cnemaspis gotaimbarai (filled triangles), and Cnemaspis kumarasinghei (stars).
Fig. 1 in Three new species of day geckos (Reptilia: Gekkonidae: Cnemaspis Strauch, 1887) from isolated granite cave habitats in Sri Lanka
Fig. 1. Currently known distribution of Cnemaspis dissanayakai sp. nov. (square) from Dimbulagala; Cnemaspis kawminiae sp. nov. (circle) from Mandaramnuwara; and Cnemaspis kotagamai sp. nov. (triangle) from Bambaragala, Sri Lanka.
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International Brain Laboratory public data
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OpenNeuro
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