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30 results for “Carbonate rocks”
Mechanical data of rotary shear experiments and temperature measurements for the manuscript: "Fast and localized temperature measurements during simulated earthquakes in carbonate rocks"
<p>Mechanical data of rotary shear experiments and temperature measurements</p> <p>Each experiment is presented in a file with the experiment name (mechanical data of rotary shear experiment) and a file with the experiment name and _Temp (temperature measurement with the optical fiber).</p> <p>Mechanical data are presented in a tab-delimited file with calibrated measurements of:</p> <ul> <li>Time (milliseconds)</li> <li>Normal stress: Normal (MPa) </li> <li>Fault displacement: Slip (mm)</li> <li>Fault velocity: Velocity (mm/s)</li> <li>Shear stress: Shearstress (MPa)</li> <li>Axial shortening: Shortening (mm).</li> </ul> <p> In a separate file, temperature data are presented as tab-delimited file with calibrated measurements of:</p> <ul> <li>Time (milliseconds)</li> <li>Temperature from optical fiber in the channel at 1.5 µm : Temperature_1,5 (°C) </li> </ul>
Major and trace bulk sample and micro-XRF geochemistry, carbon and oxygen stable isotope compositions of magmatic and sedimentary rocks from Hovedøya Island, Oslo fjord, Norway.
<p>This data set reports on the methodologies and results of geochemical analysis carried out on samples of magmatic rock, calcite and sedimentary rocks of Hovedoya Island, Oslo fjord, Norway, in the framework of the publication by Poppe et al. (2020; <em>Geochemistry, Geophysics, Geosystems</em>; <a href="https://doi.org/10.1029/2019GC008685">https://doi.org/10.1029/2019GC008685</a>). The major and trace element bulk sample geochemical analysis was carried at the Laboratoire G-Time, Université Libre de Bruxelles, Brussels (V. Debaille), the micro-XRF mapping and line scanning, was carried out at the laboratory of the Analytical and Environmental Geo-Chemistry (AMGC) group at the Vrije Universiteit Brussel (VUB), Brussels (N.J. de Winter, S. Poppe) and the stable isotope composition analysis was carried out as well at the AMGC laboratory (S. Poppe, S. Goderis), supervised by P. Claeys and M. Kervyn, in collaboration with P. Boulvias. Data sheets are provided in .csv or .xlsx format and compressed folders containing .TIF images of µXRF elemental maps are attached. This data set also contains the complete data sets obtained for the construction of calibration curves for µXRF line scan analysis of rock samples of magmatic composition at the AMGC laboratory at VUB.</p>
FIG. 2. — A in Update and observations on the extraction of ostracods (Crustacea) from the Permian hard carbonate rocks of Iran
FIG. 2. — A, Location map of the study area in the northwest of Iran (from Ghaderi et al. 2016); B, geologic map of the study area at the west of Julfa City; the Ali-Bashi section is marked with a white star (from Ghaderi 2014); C, palaeogeographic map of the Lopingian and location of the study area (white star) as a part of a Cimmerian block, close to the equator in the southern hemisphere (from Ruban et al. 2007).
FIG. 4. — A in Update and observations on the extraction of ostracods (Crustacea) from the Permian hard carbonate rocks of Iran
FIG. 4. — A, Field pictures of the Ali-Bashi section, with the succession of the Khachik Beds lower part (view Northward); B, general view of the upper parts of the Khachik Beds, include thick bedded to massive cherty limestones (view to the Northwest).
FIG. 1 in Update and observations on the extraction of ostracods (Crustacea) from the Permian hard carbonate rocks of Iran
FIG. 1. — Historical background of the Guadalupian-Lopingian successions in the northwest of Iran; following Stepanov et al. (1969), Teichert et al. (1973), Partoazar (2002), Ghaderi (2014) and Ghaderi et al. (2014a, b, 2016).
FIG. 3 in Update and observations on the extraction of ostracods (Crustacea) from the Permian hard carbonate rocks of Iran
FIG. 3. — Stratigraphic log and vertical distribution of ostracods (obtained from CH2O2 protocol) in the Khachik Formation from the Ali-Bashi section.
FIG. 5 in Update and observations on the extraction of ostracods (Crustacea) from the Permian hard carbonate rocks of Iran
FIG. 5. — Ostracods from the Khachik beds of Ali-Bashi section, NW Iran, extracted by CH2O2 technique (A1-J2) and by CH3COOH technique (K1-K3): A1- A6, Bairdia deducta deducta (Zalányi, 1974); A1, right lateral view, sample A. 197, MNHN.F.F72157; A2-A4, right lateral view, sample A. 210, MNHN.F.F72158- F72160; A5, right lateral view, sample A. 189, MNHN.F.F72161; A6, right lateral view, sample A. 207, MNHN.F.F72162; B1-B4, Bairdia hungarica Zalányi, 1974; B1, left lateral view, sample A. 189, MNHN.F.F72163; B2, right lateral view, sample A. 189, MNHN.F.F72164; B3, left lateral view, sample A.170, MNHN.F.F72165; B4, right lateral view, sample A. 176, MNHN.F.F72166; C1-C4, Bairdia sp.; C1, left lateral view, sample A. 189, MNHN.F.F72167; C2, right lateral view, sample A. 189, MNHN.F.F72168; C3, left lateral view, sample A.170, MNHN.F.F72169; C4, right lateral view, sample A. 176, MNHN.F.F72170; D1-D6, Fabalicypris parva Wang, 1978; D1, right lateral view, sample A. 194, MNHN.F.F72171; D2, right lateral view, sample A. 151, MNHN.F.F72172; D3, right lateral view, sample A. 158, MNHN.F.F72173; D4, right lateral view, sample A. 192, MNHN.F.F72174; D5, D6, right lateral view, sample A. 210, MNHN.F.F72175, F72176; E, Fabalicypris sp. 1., right lateral view, sample A. 207, MNHN.F.F72177; F, Fabalicypris sp. 2., right lateral view, sample A. 210, MNHN.F.F72178; G1-G3, Hollinella (Hollinella) herrickana (Girty, 1909); G1, left lateral view, sample A. 15, MNHN.F.F72179; G2, left lateral view, sample A. 238, MNHN.F.F72180; G3, right lateral view, sample A. 238, MNHN.F.F72181; H, Hollinella sp., left lateral view, sample A. 188, MNHN.F.F72182; I, Sargentina transita (Kozur, 1985), left lateral view, sample A. 176, MNHN.F.F72183; J1, J2, Silenites sp.; J1, right lateral view, sample A. 238, MNHN.F.F72184; J2, ventral view, sample A. 238, MNHN.F.F72185; K1-K3, Ostracoda indet. Specimens are stored in the MNHN (Muséum national d'Histoire naturelle) collections (Paris, France). Scale bar: 100 µm.
Data and scripts associated with "Rock weathering controls soil carbon storage potential at a continental scale"
<p>The zipped folder contains the following files:</p> <p>CONUS_mineral_grid.csv [gridded soil mineralogy maps, with coordinates representing cell centers]</p> <p>CONUS_grid.csv [blank grid, used for reproducing the analysis]</p> <p>NCSS_datamerge_071321.R [core script used for running the analyses presented in the associated publication]</p> <p>apply_depthwtavg.R [wrapper function for depth weighted averaging]</p> <p>attach_ENV.R [function to attach climate data]</p> <p>bootstrap_functions.R [functions for spatial bootstrap statistics]</p> <p>depthweightavg.R [function for calculating depth weighted averages]</p> <p>get_MWBM.R [function for compiling climate data into averages]</p> <p>get_SLP.R [function for reading and pre-processing the NASGLP dataset</p> <p>SLP_IDW.R [inverse distance weighting function interpolating the NASGLP data at query points]</p> <p>weather_calcs.R [secondary calculations partitioning Al and Fe; weathering rate estimation]</p>
Large variations of Calcium isotopes in Lutao arc volcanic rocks: Influence of recycled marine carbonate and partial melting
<p>The dataset for the manuscript in preparation: Large variations of Calcium isotopes in Lutao arc volcanic rocks: Influence of recycled marine carbonate and partial melting</p>
Porosity of the porous carbonate rocks in the Jingfengqiao-Baidiao area based on finite automata
<p>This study is based on the processing of computed microtomography images of rock samples. In this study, a finite automation is constructed using the gray value, RGB value, and Euler number of polarized images of carbonate rocks from the Jingfengqiao-Baidiao area. The finite automaton is used to perform black and white binary processing of the polarized images of the carbonate rocks. The porosity of the carbonate rock is calculated based on the black and white binarization processing results of the polarized images of the carbonate rocks. The obtained porosity is compared with the carbonate porosity obtained by use of the traditional carbonate research method (TCRM). When the two porosities are close, the image processing threshold of the finite automata is considered to be credible. Based on the finite automata established using the image processing threshold, the black and white binary images of the polarized images of the carbonate rocks are used to establish a rock pore image using ImageJ2X. The polarized images of the carbonate rocks are classified according to their red–green–blue (RGB) values using the finite automata for the porosity classification, and the obtained images are used as textures to paste onto a cube to construct a 3D data model of the carbonate rocks. This study also uses 16S rDNA analysis to verify the formation mechanism of the carbonate pores in the Jingfengqiao-Baidiao area. The results of the 16S rDNA analysis show that the pores in the carbonate rocks in the Jingfengqiao-Baidiao area are closely related to microorganisms, represented by denitrifying bacteria.</p>
Remagnetization of upper Triassic limestone from the central Lhasa terrane (Tibet): identification, mechanisms, and implications for diagnosing secondary remanent magnetization in carbonate rocks
<p>Raw data and supplementary material for manuscript titleted "Remagnetization of Upper Triassic limestone from the central Lhasa terrane (Tibet): identification, mechanisms, and implications for diagnosing secondary remanent magnetization in carbonate rocks".</p>
Permeability Anisotropy Data of Carbonate Fault Rocks
<p>Permeability and porosity data from core plugs of faulted and unfaulted carbonate lithofacies. 2D and 3D image analysis results of samples used in the publication also included.</p>
Insights into subduction-zone fluid-rock interactions and carbon recycling from magnesium isotopes of subducted ophiolitic mélanges in the Arabian-Nubian Shield
<p><span>Table S1:</span><span> Major element concentrations (in wt%) and Mg isotopic compositions (‰) for the ANS subducted ophiolitic mélanges.</span></p> <p><span>Table S2: Trace element concentrations (ppm) for the ANS subducted ophiolitic mélanges.</span></p>
Creep of Basalts Undergoing Carbonation: Effect of Rock-Fluid Interaction
<p>Geological carbon sequestration provides permanent CO<sub>2</sub> storage to mitigate the current high concentration of CO<sub>2</sub> in the atmosphere. CO<sub>2</sub> mineralization in basalts has been proven to be one of the most secure storage options. For successful implementation and future improvements of this technology, the time-dependent deformation behavior of basalts in presence of reactive fluids needs to be studied in detail. We conducted load stepping creep experiments on basalts from the CarbFix site (Iceland) under several pore fluid conditions (dry, H<sub>2</sub>O-saturated and H<sub>2</sub>O+CO<sub>2</sub>-saturated) at temperature, T≈80°C and effective pressure, P<sub>eff</sub> = 50 MPa, during which we collected mechanical, acoustic and pore fluid chemistry data. We observed transient creep at stresses as low as 11% of the ultimate failure strength, well below the stress level at the onset of bulk dilatancy. Acoustic emissions (AEs) correlated strongly with strain accumulation, indicating that the creep deformation was a brittle process in agreement with microstructural observations. The rate and magnitude of AEs were higher in fluid-saturated experiments than in dry conditions. The creep data can be empirically fitted using either a log - time or power law time model with stress dependent fitting parameters. We infer that the predominant mechanism governing creep deformation is time- and stress-dependent sub-critical dilatant cracking. Our results suggest that the presence of aqueous fluids exerts first order control on creep deformation of basaltic rocks, while the composition of the fluids plays only a secondary role under the studied conditions.</p>
Erosional exhumation of carbonate rock facilitates dispersal-mediated allopatric speciation in freshwater fishes
<p>A fundamental goal of evolutionary biology is to understand the mechanisms that generate and maintain biodiversity. Discovery and delimitation of species represent essential prerequisites for such investigations. We investigate a freshwater fish species complex comprising <em>Etheostoma bellator</em> and the endangered <em>E. chermocki</em> which is endemic to the Black Warrior River system in Alabama, USA, a global hotspot of temperate freshwater biodiversity. Phylogenomic analyses delimit five geographically disjunct species masquerading as <em>E. bellator</em>. Three of these new species exhibit microendemic distributions comparable to that of <em>E. chermocki</em> raising the possibility that they also require protection. The species of the complex are found in streams flowing over carbonate rock and they are separated by waterways flowing over siliciclastic rock, a geographic pattern dictated by the underlying stratigraphy and structural geology. Over time, rivers have eroded downward through layers of siliciclastic rocks in the basin, gradually exposing underlying carbonate rock, the substrate of suitable habitat today. Our results suggest that episodic dispersal to patches of suitable habitat set the stage for allopatric speciation in the species complex. Our study suggests that the presence of heterogeneous rock can facilitate dispersal-mediated allopatric speciation in freshwater organisms in the absence of external tectonic or climatic perturbations.</p>
Erosional exhumation of carbonate rock facilitates dispersal-mediated allopatric speciation in freshwater fishes
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Porosity of the porous carbonate rocks in the Jingfengqiao-Baidiao area based on finite automata
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Data for "Misestimation of forest soil carbon and nitrogen stocks due to rock fragments: A case study of large number samples in a boreal forest watershed ecosystem of northeast China"
<p>Here are the data for "<span>Misestimation of forest soil carbon and nitrogen stocks due to rock fragments: A case study of large number samples in a boreal forest watershed ecosystem of northeast China</span>", using the format of"excel".</p>
Dataset for Automatic Calibration of Microproperties for 3D Parallel Bond Model of Ultra-Deep Carbonate Rocks and the Influence of Confining Pressure on Crack Propagation Patterns
<p>The data set is composed of results of three-dimensional (3D) Discrete Element Method (DEM) modeling performed by Xiaoyun Cheng et al., with the licensed commercial <em>Particle Flow Code </em>3D version 6.0 (PFC3D 6.0) from Itasca Consulting Group, Ltd. Part of the Figures were made with Origin Pro, Version 2021. OriginLab Corporation,Northampton, MA, USA. Part of the Figures were made with ParaView, Version 5.13.1.</p>
Enhanced Weathering Using Basalt Rock Powder: Carbon Sequestration, Co-benefits and Risks in a Mesocosm Study With Solanum tuberosum data
<p>Dataset used in the work: Enhanced Weathering Using Basalt Rock Powder: Carbon Sequestration,Co-benefits and Risks in a<br> Mesocosm Study With Solanum tuberosum</p> <p><br> authors: <br> Arthur Vienne, Silvia Poblador , Miguel Portillo-Estrada, Jens Hartmann,<br> Samuel Ijiehon, Peter Wadeand Sara Vicca</p>
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