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15 results for “Oceanic crust”
Seismic Model of the Seafloor Sediment and Shallow Oceanic Crust of the Alaska-Aleutian Subduction Zone at the Alaska Peninsula
<p>This dataset is supplementary to</p> <blockquote> <p>Zheng, Mengjie, Sheehan, Anne, Liu, Chuanming, Wu, Mengyu, & Ritzwoller, Michael. (2024). Characterizing Sub-Seafloor Seismic Structure of the Alaska Peninsula Along the Alaska-Aleutian Subduction Zone. <em>Journal of Geophysical Research: Solid Earth</em>, <em>129</em>(11), e2024JB029862. <a href="https://doi.org/10.1029/2024JB029862">https://doi.org/10.1029/2024JB029862</a></p> </blockquote> <p>This dataset contains files of sub-seafloor S-wave velocities and sediment properties.</p>
Datasets for the paper: "Rock-matrix porosity and permeability of the hydrothermally altered, upper oceanic crust, Oman ophiolite"
<p>This dataset includes all the data used for the paper submitted to the Journal of Geophysical Research: Solid Earth, entitled: <strong>Rock-matrix porosity and permeability in the hydrothermally altered, upper oceanic crust, Oman ophiolite. </strong></p> <p>One excel file is provided with the following tables on separate sheets:</p> <p>Table 1: Sample locations, alteration types, and petrophysical analyses</p> <p>Table S1: Trace element Zirconium and Yttrium analysis for this study’s sample set in Figure S1</p> <p>Table S2: Outcrop upscale results from image analysis</p> <p>Table S3: Sample bulk rock geochemistry</p>
Supplementary Videos for "The Stability of Dense Oceanic Crust Near the Core-Mantle Boundary"
<p>Supplementary video files for manuscript "The Stability of Dense Oceanic Crust Near the Core-Mantle Boundary". </p> <p>Contains movies for simulations, B0.00, B0.22, B0.33, B0.44, B0.55, B0.66, B0.77, B0.88 showing the temporal evolution of the temperature anomaly and bulk composition fields for a view of the 3D mantle domain with a segment removed. </p>
Data sets for "Formation of an Al-rich niccolite-type silica in subducted oceanic crust: implications for water transport to the deep lower mantle"
<p>This is the XRD and IR datasets for the article "Formation of an Al-rich niccolite-type silica in subducted oceanic crust: implications for water transport to the deep lower mantle" by Liu and Yuan et al.</p>
Discovery of Ultra-depleted Melt Inclusion in Late Cretaceous Intracontinental Basaltic Andesites in South China: Implications for Recycling of Lower Oceanic Crust
<p><strong>Contents of this file </strong></p> <p><strong>S1. Supplementary Text:</strong></p> <p><strong>1. </strong>Data compilation and statistical analysis</p> <p><strong>2.</strong> Reconstructing the chemical compositions of melt inclusion</p> <p><strong>3.</strong> Batch melting calculation</p> <p><strong>4.</strong> Melt-plagioclase diffusive interaction model</p> <p><strong>S2. Supplementary Table:</strong></p> <p><strong>Table S1. </strong>The parameters used in batch melting calculation.</p> <p><strong>Table S2. </strong>Parameters used in the melt-plagioclase diffusive interaction model</p> <p><strong>Table S3. </strong>Input and output data for the melt-plagioclase diffusive interaction model.</p> <p><strong>S3. Supplementary Figure:</strong></p> <p><strong>Figure S1. </strong>Primitive mantle-normalized trace element patterns.</p> <p><strong>S4. Supplementary Dataset (uploaded separately):</strong></p> <p><strong>Dataset S1. </strong>Compiled data including basaltic rocks from South China, MORBs, and Hawaiian OIBs.</p> <p><strong>Dataset S2. </strong>Olivine chemical compositions.</p> <p><strong>Dataset S3. </strong>Bulk-rock major oxide, trace element, and Sr-Nd-Pb-Hf isotopic compositions.</p> <p><strong>Dataset S4. </strong>Measured and corrected major element compositions of melt inclusion.</p> <p><strong>Dataset S5. </strong>Measured and corrected trace element compositions of melt inclusion.</p> <p><strong>Dataset S6. </strong>Pb isotopic compositions of melt inclusion.</p>
Phase compositions in carbonated oceanic crust
<p><span>High-pressure experiments were performed at 3–15 GPa and 700–1300°C in a 1000-ton multi-anvil press at the SEDI-Lab, China University of Geosciences (Wuhan), to investigate the phase relations of subducted carbon-bearing oceanic crust. Thirty-four samples were recovered after the experiments. All minerals in the recovered experimental charges were analyzed with an electron probe micro-analyzer (EPMA, JXA-8230), installed at the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Wuhan). The accelerating voltage was 15 kV, and counting times were 10 s for the measured elements and 5 s for each side of the background. A beam current of 20 nA and beam size of 1–2 µm were used for silicate minerals and Ti-rich oxides. For quench liquids, a beam current of 10 nA and beam size of ~5–20 µm. </span></p>
Phase compositions in carbonated oceanic crust
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Numerical simulation of cool hydrothermal processes in the upper volcanic crust beneath a marine sediment pond: North Pond, North Atlantic Ocean
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Compiled bulk rock uranium, thorium and loss on ignition (LOI) concentrations in serpentinites and altered oceanic crust
<p>The dataset includes a compilation of published uranium, thorium and loss on ignition (LOI) concentrations for bulk rock serpentinite samples organized by tectonic setting. All references are included in the file.</p>
Factors on the Mesozoic transition from flat to steep subduction of the Paleo-Pacific Plate beneath South China: Thickened oceanic crust and subduction rate
<p>This dataset contains simulation results used for visualizing Figures in "Factors on the Mesozoic transition from flat to steep subduction of the Paleo-Pacific Plate beneath South China: Thickened oceanic crust and subduction rate"</p>
Structural data for "Structural and rheological evolution of brittle fault zones in mafic crust: Implications for the strength of oceanic transform faults"
<p>Structural data for "Structural and rheological evolution of brittle fault zones in mafic crust: Implications for the strength of oceanic transform faults"</p>
GPS data set used in the paper "Anelastic response of the Earth's crust underneath the Canary Islands revealed from ocean tide loading observations"
<p>Data set of continuous GPS observations at CVAN site in Gran Canaria (Canary Islands, Spain). The period of observation spans from July 3, 2013 to November 30, 2015. Data was acquired during the execution of the research project GCL2011-25494 of the Spanish Research Agency. </p> <p>This data set belongs to the Research Group ‘Geodesia’ of the University Complutense of Madrid, Spain, and has been used in the paper "Anelastic response of the Earth's crust underneath the Canary Islands revealed from ocean tide loading observations", by Jose Arnoso, Machiel S. Bos, Maite Benavent, Nigel T. Penna, Sergio Sainz-Maza, submitted to Geophysical Journal International, 2022.</p>
The composition of the lower oceanic crust in the Wadi Khafifah section of the southern Samail (Oman) ophiolite
<p>The composition of the intrusive gabbroic lower oceanic crust remains poorly characterized in comparison to the extrusive portion of the oceanic crust, especially for intermediate-fast spreading mid-ocean ridges. This is a consequence of limited exposures of extant lower oceanic crust and of ophiolites similar to mid-ocean ridge crust. One of the best analogues for mid-ocean ridge crust is the southern Samail ophiolite that formed during a period of rapid seafloor spreading above a nascent subduction zone. Here, we focus on the geochemical stratigraphy (whole rock and mineral major and trace element compositions) of the 5200 m-thick, lower crustal, Wadi Khafifah section of the Wadin Tayin massif in the southern Oman ophiolite. Gabbros from the lowermost 3700 m of this section (the 'lower gabbros') show no systematic changes in composition with height above the Mantle Transition Zone. In contrast, gabbros from the uppermost 1500 m (the 'upper gabbros') display marked increases in incompatible trace element concentration with increasing height. Liquids in equilibrium with the lower gabbros have major and trace element compositions that overlap with those measured in the upper gabbros and sheeted dikes. Upper gabbros preserve mineral cores with primitive major element compositions that overlap with the range of lower gabbros, however, upper gabbro whole rock compositions are significantly more enriched in incompatible trace elements relative to the lower gabbros. Our data reveal that the upper gabbros are a composite of accumulated minerals derived from primitive melts and a large fraction of evolved melts derived from the fractionation of the lower gabbros. We propose a new "Full Sheeted Sills" model for the lower oceanic crust in which primitive magmas from the mantle are emplaced throughout the lower crust and crystallized <i>in situ</i>. After diking events, evolved magmas leave the lower gabbros and replenish the upper gabbros, thereby contributing to the higher incompatible trace element budget in the upper gabbros relative to the lower gabbros. Our reconstructed bulk compositions of the lower plutonic crust and the bulk oceanic crust from the Wadi Khafifah section yield a plausible primary mantle-derived magma composition in equilibrium with depleted MORB mantle.</p>
The composition of the lower oceanic crust in the Wadi Khafifah section of the southern Samail (Oman) ophiolite
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Supporting information for "Sound velocity of zoisite at high pressures and implications for the velocity structure in subducting oceanic crust"
<p>Supporting information for "Sound velocity of zoisite at high pressures and implications for the velocity structure in subducting oceanic crust"</p>
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