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167 results for “granite”
Dataset of "Geophysical Investigation of a Granite Exfoliation Dome: Enchanted Rock, Texas"
<p>This repository contains the dataset of a paper titled: "Geophysical Investigation of a Granite Exfoliation Dome: Enchanted Rock, Texas".</p> <p>This data was made possible in collaboration with the University of Houston - Department of Earth and Atmospheric Sciences and the summer Geophysical Field Camps of 2018 and 2019. Special thanks to the staff of the Enchanted Rock State Natural Area for granting survey access to the site.</p>
Nanoindentation and AFM Dataset for the Microscale Mechanical Property of Granites
<p>This dataset contains the raw results of nanoindentation testing and Atomic Force Microscopy (AFM) testing, which were used to determine the elastic property of rock-forming minerals and interphases in granites. The dataset is presented and utilized in the paper 'Determining Young's Modulus of Arbitrarily-shaped Granite Samples using Accurate Grain-based Modelling with Micro-RME'. Full details of the experimental setup, procedure, and imaging analysis can be found in the paper and supporting information.</p> <p>The results of nanoindentation testing for different rock-forming minerals in granites are contained within three files: nanoindentation_quartz, nanoindentation_feldspar and nanoindentation_biotite. In these files, the raw data during nanoindentation testing is shown with achieved parameters, including elastic modulus, hardness, maximum load fore, maximum contact area, and contact depth. These results are then used to determine the elastic modulus of rock-forming minerals. The achieved Young's modulus for quartz, feldspar and biotite are 96.81 GPa, 69.50 GPa and 46.41 GPa, respectively, for present granitic samples.</p> <p>The results of AFM testing for interphases between different rock-forming minerals in granites are contained within three files: AFM_quartz_feldspar_interphase, AFM_feldspar_biotite_interphase and AFM_quartz_biotite_interphase. In these files, the raw data of 196,608 indents during AFM testing is shown with obtained parameters, including elastic modulus and surface roughness. These results are then used to determine the geometry and elastic modulus of interphases. The achieved Young’s modulus of interphase is 24.48 GPa for present granitic samples. Additionally, the geometry of striped interphases between different rock-forming minerals is shown, which is complex with varying widths.</p>
EPMA dataset - Tso Morari granites
<p>Accompanying datatset for publiication entitled <strong>"The emplacement, alteration, subduction and metamorphism of metagranites from the Tso Morari complex, Ladakh Himalaya"</strong></p> <p>Thin sections were made from 11 macroscopically undeformed granite samples from the Tso Morari complex. Samples 11-01, 11-02, L08-04 and a05-10 were selected for detailed petrological analysis. Major element compositions of minerals that exhibit solid solutions were measured using a Cameca SX-5 field emission electron microprobe (EMPA) at the Department of Earth Sciences, University of Oxford. All EMPA analyses were conducted with 15 keV acceleration potential, 20 nA beam current. For all major elements, the on-peak count time was 30 seconds with 30 seconds background count. Ti was measured with a 60 seconds on-peak count time and 60 seconds background collection. A range of natural and synthetic oxide standards were used including albite (Na, Al, Si), MgO (Mg), wollastonite (Ca), andradite (Fe), Mn (Mn) and TiO<sub>2</sub> (Ti) and analyses were verified against secondary mineral standards. Raw analyses were automatically corrected for atomic number, absorption and fluorescence using the <em>phi-rho-z</em> matrix correction routine (Merlet, 1994). Mineral spot analyses and line profiles were taken across white mica and garnet to determine the extent of intracrystalline compositional variation.</p>
Supplementary Material. Radiogenic isotope data of K-feldspars from Sveconorwegian pegmatites and granites.
<p>Supplementary Material Radiogenic isotope data of K-feldspars from Sveconorwegian pegmatites and granites as part of the part of the paper Lead isotopes and the sources of granitic magmas: The Sveconorwegian granite and pegmatite province of southern Norway by Rosing-Schow, N., Andersen, T., Müller, A. submitted to MDPI Minerals.</p>
Nanoindentation Dataset for the Microscale Mechanical Property of Granites
<p>This dataset contains the raw results of nanoindentation testing, which are used to determine the elastic and failure property of rock-forming minerals in granites, which then provides the input parameters for accurate grain-based modeling. The dataset is presented and utilized in the paper 'Thermally induced microcracks in granite and their effect on the macroscale mechanical behavior'. Full details of the experimental setup, procedure, and imaging analysis are able to be found in this paper.</p> <p>The results of nanoindentation testing of different rock-forming minerals by different indents are contained within six files: Berkovich_quartz, Berkovich_feldspar, Berkovich_biotite, Cube corner_quartz, Cube corner_feldspar and Cube corner_biotite. In these files, the raw data of nanoindentation testing includes elastic modulus, hardness, maximum load fore, maximum contact area, and contact depth. These results are then applied to calculate the elastic and failure properties of rock-forming minerals.</p>
Triaxial cycling loading of Westerly granite: Mechanical and Ultrasonic data
<p>Data obtained from triaxial cyclic loading experiments conducted on dry Westerly granite at confining pressure ranging from 40 to 120 MPa.</p> <p>Text files (.txt) are raw, unprocessed time series of mechanical data including load, shortening and radial and axial strain gauge measurements. Except noted, units are in Volts. Strain gauge voltages can be converted into strain using gauge factor of 2.11 and amplification factor of 40. External shortening can be converted to sample shortening using a machine stiffness of 480 kN/mm.</p> <p>Raw ultrasonic data are combined in folders named BSF*. Data format is binary, and can be read using ASC ltd. software "Insite".</p> <p>Files "sensors.txt" contain ultrasonic sensor positions and time offset corrections.</p>
180212 Granitic rocky slope in Braga
<p>3DPC or a granitic rocky slope excavated in Braga, Portugal, here:</p> <p>https://www.google.com/maps/search/braga+estadio/@41.5603111,-8.4289521,55a,35y,90h,39.5t/data=!3m1!1e3</p> <p>We used the SfM technique and a Nikon 5300 camera. The point cloud was processed using Agisoft Metashape. </p> <p>More info here:</p> <p>https://link.springer.com/chapter/10.1007/978-3-030-32029-4_73</p>
Non-exhaustive record of locations of Shap granite (Sg) boulders and Shap microgranite (Sa) clasts in the Lake District region, UK.
<p><strong><em>Non-exhaustive record (~10,000) of locations of Shap granite (Sg) boulders and Shap microgranite (Sa) clasts. Search area was limited from: in the NE, the eastern margin of Gaythorn Plain; in the NW, Shap Pink Quarry; in the SE, Farleton Fell and; in the SW, the locale of Kendal (approximate coordinates of the study area: NE: 54.499850° -2.519770°; NW: 54.468401° -2.685596°; SE: 54.226849° -2.519770°; SW: 54.227170° -2.770000°)</em></strong></p> <p>The northern limit to the study area was selected to exclude the northern plume, which disrupted the earlier eastern plume over Crosby Ravensworth Fell. The western limit was selected to enclose the known western limit of the Mint plume. The eastern limit was selected to enclose the known eastern limit of the Lune plume. The southern limit was selected to enclose the broadening of the Mint plume in the vicinity of Kendal. </p> <p>A comprehensive field survey was made of lower Borrowdale and northwards. The western Sg plume down the Mint valley south to Kendal, and the area of Lune Gorge, south of Dillicar, were surveyed cursorily, mainly checking published locations and adding additional locations encountered during this exercise. Prior reports for the Mint valley show a well-defined narrow plume, so to reduce the workload, a more complete record of locations has yet to be compiled. Similarly, from prior reports, boulder locations are few in the region around Kendal and east to the southern portion of the Lune valley and the overall distribution, before clearances, was recorded adequately in the 19<sup>th</sup> C.</p>
Thermal conductivity of granite at various temperatures
<p><strong>Thermal conductivity of granite at various temperatures</strong></p> <p>Junjie Chen</p> <p>Contributor: Junjie Chen, ORCID: 0000-0001-5055-4309, E-mail address: komcjj@gmail.com, Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China</p> <p> </p> <p>Granite is a coarse-grained intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground. It is common in the continental crust of Earth, where it is found in igneous intrusions. These range in size from dikes only a few centimeters across to batholiths exposed over hundreds of square kilometers. Granite is typical of a larger family of granitic rocks, or granitoids, that are composed mostly of coarse-grained quartz and feldspars in varying proportions. These rocks are classified by the relative percentages of quartz, alkali feldspar, and plagioclase, with true granite representing granitic rocks rich in quartz and alkali feldspar. Most granitic rocks also contain mica or amphibole minerals, though a few contain almost no dark minerals.</p> <p> </p> <p>Thermodynamic temperature (degrees kelvin), Thermal conductivity (watts per meter-kelvin)</p> <p>368 1.78</p> <p>523 1.95</p> <p>600 1.86</p> <p>643 1.74</p> <p>733 1.8</p>
Real-time imaging of thermally induced microcracks in granite with ultrahigh-temperature instrument
<p>An ultrahigh-temperature heating platform (HS1400G, Instec, Britain) on the optical microscope (BX51M, Olympus, Japan) was developed to observe the microcrack propagation of thin-section samples during heating in real time.</p> <p>Singapore Bukit Timah granite rock cores were examined in this study. The granite rock is widespread and one of the major rock formations in Singapore. It shows significant mechanical deterioration under the influence of heat. The rock sample was prepared as doubly polished thin sections of approximately 60 μm in thickness for petrographic analysis and microthermometric observation. Before the experiment, the slide was heated with an alcohol lamp to dissolve the resin, and the thin-slice sample was removed and immersed in acetone to wash the surface glue to avoid affecting the observation.</p> <p>The granite sample was heated in the following heating process: heat from room temperature of 25℃ to 100℃ at a rate of 20℃/min; maintain the temperature for 5 min, as the thin-section sample is sufficiently small to generate a homogeneous thermal field quickly; heat to 100℃, 200℃, 300℃, 400℃, 500℃, 600℃, 700℃, 800℃ and 900℃ successively; finally, reduce the temperature to room temperature at a cooling rate of 20℃/min from the maximum temperature.</p>
Granite Seahorse
**About the sculpture**  This sculpture, created in 1989 by Patrig Ar Goarnig and Lucien Crenn, is located near the cove of "Porz Ar Streat" in Plouescat, in France. For those of you who prefer Google Maps, you'll find it [here](https://goo.gl/maps/ESzuX8LEXkx) ;) It represents a Seahorse, which tail is wrapped around a sleeping cat on one side, and a Yin-Yang symbol on the other. **Process**  The scan was made from 140 pictures (the last of them under a heavy rain), reconstructed with Colmap and OpenMVS and optimized to a lowpoly version (10k triangles) with Blender and [BakeMyScan](http://bakemyscan.org). I also used a weight-painted metric for the retopology to keep the important details: do not hesitate to check the wireframe view. Finally, and due to parts of the statue being wet, I also decided to ditch the computed albedo map and used a mix of granite PBR textures instead. Source: Objaverse 1.0 / Sketchfab
Viipuri Granite carving detail
A small decoration carving scan of the Granite Palace (Headquarters of "Hackman & Co") located at Viipuri (nowadays Vyborg, Russia). Building was erected in 1909 by finnish arcitects Uno Ullberg and Сlas Axel Gyldén. Sadly current president of Russia mr. Zalupa couldn't care less about history, architecture and heritage, so his henchmen in Vyborg made everything for that beautiful building to be dismantled or simply crah due to no maintemance. Right now it's abandoned and destroyed inside despite ideal location in the literally center of the city. And soon only occational stones like depicted in my scene will left... Luckily building was erected pretty good and still stands without much of the problems to the annoyance of local administration. https://ru.wikipedia.org/wiki/%D0%93%D1%80%D0%B0%D0%BD%D0%B8%D1%82%D0%BD%D1%8B%D0%B9_%D0%B4%D0%B2%D0%BE%D1%80%D0%B5%D1%86 p.s.: RAW scan data: https://yadi.sk/d/KP2kZ9Lt3KfNVz Source: Objaverse 1.0 / Sketchfab
Dataset for three granites
<p>The dataset contains data related to three outcropping granites from Scandinavia (Kuru Grey and Red Bohus) and from the South of France (Sidobre).</p> <p>The rocks are tested for UCS, BTS and triaxial compressive strength with confining pressures up to 225 MPa or/and high strain-rates up to 10^3/s.</p> <p>Some of the data were genrated in the EU Horizon 2020 project ORCHYD. Other data were generated in a previous project (funded by the Research Council of Norway). They are all gathered here as they relate to a publication where both test procedures and data are fully described.</p> <p>The data is compiled into a zip file. The data is made of text-like and Excel files. The Python scripts allowing to reproduce all figures in the publication are also provided.</p>
Geochronological and geochemical data for Late Triassic granitic rocks in Central Qiangtang
<p>Supplementary Table 1. Zircon isotopic LA-ICP-MS analyses for the granitoid samples.</p> <p>Supplementary Table 2. Major (wt.%) and trace element (ppm) compositions of the granitoid samples.</p> <p>Supplementary Table 3. Hf isotopes of zircons of the granitoid samples.</p> <p>Supplementary Table 4. Summary of age data for the Late Triassic magmatic rocks and metamorphic rocks in the Central Qiangtang.</p>
The stress- and fluid-pressure-driven frictional slip data for variably roughened fractures in Gonghe granite
<p class="Abstract"><a name="_Hlk122089471"></a><span>We explore</span><span> the impacts of stress- and fluid-pressure-driven frictional slip on variably roughened fractures in Gonghe granite (Qinghai province, China). Slip is on an inclined fracture under simple triaxial stresses with concurrent fluid throughflow allowing fault permeability to be measured both pre- and post-reactivation. Under stress-drive, smooth faults are first slip-weakening and transition to slip-strengthening with rough faults slip-strengthening, alone. A friction criterion accommodating a change in friction coefficient and fault angle is able to fit the data of stable-slip and stick-slip. Under fluid-pressure-drive, excess pore pressures must be significantly larger than average pore pressures suggested by the stress-drive-derived failure criterion. This overpressure is conditioned by the heterogeneity of the pore pressure distribution in radial flow on the fault and related to the change in permeability</span><span>. Fault roughness impacts both the coefficient of friction and the permeability and therefore exerts important controls in fluid-injection-induced earthquakes.</span><span> </span><span>The results potentially improve our ability to assess and mitigate the risk of injection-induced earthquakes in EGS.</span><span> </span></p>
Stress-induced anisotropic poroelasticity in Westerly granite: Mechanical and Ultrasonic data
<p>Data obtained from triaxial loading experiments conducted on thermally cracked Westerly granite which was initially dry and later saturated with water.</p> <p>Text files (.txt) are raw, unprocessed time series of mechanical data including load, shortening and radial and axial strain gauge measurements. Except noted, units are in Volts. Strain gauge voltages can be converted into strain using gauge factor of 2.11 and amplification factor of 40. External shortening can be converted to sample shortening using a machine stiffness of 480 kN/mm.</p> <p>Raw ultrasonic data are combined in folder named BSF*. Data format is binary, and can be read using ASC ltd. software "Insite".</p> <p>Files "sensors.txt" contain ultrasonic sensor positions and time offset corrections.</p> <p>Mechanical and Ultrasonic data are provided for when the sample was dry. Only mechanical data are provided for saturated conditions.</p>
Experimental Evidence for Shear-induced Melting and Generation of Stishovite in Granite at Low (<18 GPa) Shock Pressure [Dataset]
<p>Source data for Experimental Evidence for Shear-induced Melting and Generation of Stishovite in Granite at Low (<18 GPa) Shock Pressure.</p>
Data from: Direct evidence of permeability evolution of Nanan granite after two cooling paths under different confining pressures: A comparative study
<p>Permeability decides the mass transfer behavior and plays a key role in the heat extraction of enhanced geothermal systems (EGSs), and the aim of the injection of cooling water is to enhance permeability within the geothermal reservoirs. Direct evidence of how cool water affecting permeability evolution is still limited. Therefore, we explored the permeability evolution of Nanan granite after air and water cooling under different confining pressures combined with optical microscopy and X-ray CT observation. We found that there are lots of microdefects observed in Nanan granite after two cooling paths, which dominantly drives the evolution of permeability from a microscopic scale. The permeabilities of granite under water-cooling condition are always larger than those under air-cooling condition, and water-cooling treatment further enhances the permeability of specimens. The permeabilities of granite specimens after two cooling paths decrease with confining stress. More microcracks and better connectivity among microcracks produce a larger permeability within the specimen after water cooling. The observed microcracks are regarded as the seepage channels and direct microscale evidence of permeability evolution of granite after two cooling paths. Our results may suggest that water injection is an efficient way for permeability enhancement due to thermal microcracks propagation in thermal simulation.</p>
Fig. 6 in Red wood Ants (Formica rufa-group) prefer mature pine forests in Variscan granite environments (Hymenoptera: Formicidae)
Fig. 6 – Preferred terrain exposure of RWA nests in a, MG (n=2,328) and b, FB (n=2,829) study area.
Mercury abundance and isotopic composition in granitic rocks: Implications for Hg cycling in the upper continental crust
<p>Mercury (Hg) is a highly volatile metal exhibiting both isotope mass-dependent (MDF, defined as δ<sup>202</sup>Hg) and mass-independent (MIF, expressed as Δ<sup>199</sup>Hg) fractionation. Assessing the Hg isotopic composition of the upper continental crust is crucial for the use of this new geochemical tool for petrogenetic tracing, particularly for understanding crust-mantle interaction. Here, we report Hg isotopic compositions of granitic rocks with distinct source affinity (I-, A-, and S-type) and of metasedimentary enclaves from the South China Craton. The results of more than 100 rock samples show large δ<sup>202</sup>Hg variations of -2.03 to 0.47 ‰ and relatively small Δ<sup>199</sup>Hg variations of -0.16 to 0.09 ‰. The S-type granites studied here exhibit higher δ<sup>202</sup>Hg values (-0.58 to 0.00 ‰; n=57) than their sedimentary protoliths (metasedimentary enclaves; -2.03 to -0.91 ‰; n=7), suggesting significant Hg-MDF during magmatic processes. The Δ<sup>199</sup>Hg values of S-type granites (-0.08 to 0.09 ‰) are indistinguishable from their sedimentary protoliths (-0.16 to 0.02 ‰), suggestive of the absence of Hg-MIF during crustal anatexis and subsequent magmatic differentiation. The I- and A-type granites studied have smaller Δ<sup>199</sup>Hg variations of -0.11 to 0.04 ‰ (n=28) and -0.07 to 0.04 ‰ (n=15), respectively, but are within the range of the S-type granites. The compositional range of all granite variants may be explained by the variable intensity of large-scale MASH (melting-assimilation-storage-homogenization) processes. Our new data combined with previously published data of igneous, sedimentary and metamorphic rocks allow us to estimate that the upper continental crust (UCC) has a Hg abundance of 13.5 ppb and a weighted average δ<sup>202</sup>Hg of -1.15 ± 1.01 ‰ (2SD), which are higher than the corresponding value of the primitive mantle, indicating the enrichment of Hg and δ<sup>202</sup>Hg in the UCC. However, the weighted average Δ<sup>199</sup>Hg value of the UCC (0.03 ± 0.15 ‰; 2SD) is undistinguished from the primitive mantle, suggesting no obvious Hg-MIF during the formation and differentiation of the continental crust.</p>
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OpenNeuro
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