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27 results for “Diagenesis”
Models of the early diagenesis of neodymium and its radiogenic isotope at deep-sea site HH3000, Oregon margin, Northeast Pacific
<p>Outputs of the early diagenetic model for neodymium and its radiogenic isotope at deep sea station HH3000 (3060 m, 43°52'N, 125°38'W) from the Oregon margin, Northeast Pacific.</p> <p>Three types of models are included, and the files are named as following:</p> <p>1. Baseline simulations, "HH3000Nd.baseline.copre_output.xlsx" for the co-precipitation formulation, and "HH3000Nd.baseline.revscan_output.xlsx" for the reversible scavenging formulation.</p> <p>2. Sensitivity tests of silicate dissolution rate: "HH3000Nd.{<em>mineral</em>}.{<em>dissolution rate</em>}_output.xlsx", where {<em>mineral</em>} can be "Basalt", "Plag" (plagioclase), "Cpx" (clinopyroxene) or "Chl" (chlorite), and {<em>dissolution rate</em>} can be "1e0" to "1e5", referring to the order of magnitude reduction of dissolution rate relative to the laboratory-derived rates.</p> <p>3. Sensitivity tests of authigenic clay precipitation rate: “HH3000Nd.basalt.{<em>precipitation rate</em>}.illite_output.xlsx", where "{<em>precipitation rate</em>}" can be "no", "slow", "normal", or "fast".</p> <p>Explanations of the modeled variables in the above files can be found in "model variable note.xlsx".</p>
Text-fig. 3. Examples of plant macrofossil assemblages from post-evaporitic sections. a: bedding plane from Ciabòt Cagna covered by impressions of plant parts, with dominance of leaves of cf. Oleinites liguricus M.SACHSE, MCEA-P05038. b: waterloggedcompressed seeds of Toddalia latisiliquata (R.LUDW.) H.-J.GREGOR sieved out of a bulk sediment sample from Pollenzo, MGPTPU141033. c: millimeter-sized, waterlogged-compressed seeds of Sambucus pulchella C.REID et E.REID with abundant cracks, probably formed during both diagenesis and extraction of the fossils (bulk sediment sample from Ciabòt Cagna), MGPT- in Late Messinian Flora From The Post-Evaporitic Deposits Of The Piedmont Basin (Northwest Italy)
Text-fig. 3. Examples of plant macrofossil assemblages from post-evaporitic sections. a: bedding plane from Ciabòt Cagna covered by impressions of plant parts, with dominance of leaves of cf. Oleinites liguricus M.SACHSE, MCEA-P05038. b: waterloggedcompressed seeds of Toddalia latisiliquata (R.LUDW.) H.-J.GREGOR sieved out of a bulk sediment sample from Pollenzo, MGPTPU141033. c: millimeter-sized, waterlogged-compressed seeds of Sambucus pulchella C.REID et E.REID with abundant cracks, probably formed during both diagenesis and extraction of the fossils (bulk sediment sample from Ciabòt Cagna), MGPT-
Dataset for the manuscript: "Elevated-Mn ChemCam Targets Illuminating Mn Redox Cycling and Diagenesis in the Bradbury Rise, Gale Crater, Mars"
<p><span>The dataset for the manuscript titled, “Elevated-Mn ChemCam Targets Illuminating Mn Redox Cycling and Diagenesis in the Bradbury Rise, Gale Crater, Mars” consists of a single CSV file. This CSV contains 1,539 rows, with one ChemCam observation point per row. The observation points in this file are from the ChemCam rock targets between martian solar days (sols) 1 and 600 of the MSL <em>Curiosity</em> rover mission that have at least one observation point with > 0.2 wt% MnO. Metadata and compositional data are provided for each row. The metadata includes the LIBS spectrum filename; the name of the target to which the observation point belongs; the class into which we grouped the target; the spacecraft clock value (timestamp) for the observation point; the sol on which the observation was taken; and the ChemCam sequence identifier; the observation point number within the sequence; the ChemCam-to-target distance (in meters); the laser power used for the LIBS measurements; the spectrum totals; and a binary column indicating whether the observation point has > 0.2 wt% MnO. The compositional data includes the oxide chemistry (oxide wt.%), RMSEP accuracy, and shot-to-shot standard deviation, for the major oxides SiO2, TiO2, Al2O3, FeOT, MgO, CaO, Na2O, K2O, as well as for MnO; the sum of oxides for each observation point is also provided.</span></p>
Fig. 12 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 12. Water salinities (in ppt) calculated from Recent and fossil aragonite samples. Abbreviations: op, outer prismatic layer; ip, inner prismatic layer; nac, nacreous layer; cl, crossed lamellar layer.
Fig. 11 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 11. Principal component plots based on the chemical compositions of the Recent and fossil shells, sediments and sedimentary calcite. Sedimentary calcite (labelled "calcite" in the diagram) is clearly separated from the Recent and fossil shell calcites.
Fig. 8 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 8. Element distribution maps for Sr (A), Mg (B), Fe (C), and S (D) across the aragonite/calcite boundaries in Goniocamax sp. from the Turonian of N Siberia.
Fig. 7 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 7. Minor element contents (in ppm) in fossil shells. A. Average compositions of aragonite and calcite in Goniocamax. B. Average compositions of inner prismatic and nacreous layers in ammonites. C. The compositions of a crossed lamellar aragonite layer in a gastropod; a nacreous aragonite layer in an inoceramid shell, and a foliated calcite layer in Pecten.
Fig. 6 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 6. Box and whisker plots for selected minor elements in Recent and fossil shells, and sedimantary calcite. Details of analysed samples are given in the section "Materials and methods". Plots are for magnesium Mg (A), strontium Sr (B), sodium Na (C), iron Fe (D), sulphur S (E), and phosphorus P (F). Recent samples: left part of the graph; fossil samples: right part of the graph.
Fig. 4 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 4. Minor element contents (in ppm) in Recent shells. A. Average compositions of inner prismatic and outer prismatic aragonite layers in Sepia and Spirula. B. Average compositions of inner prismatic, nacreous and outer prismatic aragonite layers in Nautilus macromphalus. C. Average compositions of crossed lamellar aragonite layer in gastropods; in the nacreous aragonite layer in Pinna nobilis, and foliated calcite layer in Pecten.
Fig. 5 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 5. Box and whisker plots based on the chemical compositions of the shells. A. Explanation of the box and whisker plot. B. Box and whisker plot for Ca in Recent and fossil shells, and sedimentary calcite.
Fig. 9 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 9. Principal component plots based on the chemical compositions of the Recent and fossil shells. A. Samples are grouped according to their age, with Recent shells having relatively high Ca and Na contents, and low Fe, P, and Sr contents. B. Samples are grouped according to their mineralogy in terms of calcite and aragonite. Calcite samples have relatively high Mg, S, and Ca contents, and aragonite samples have higher Sr contents.
Fig. 10. 3D in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 10. 3D principal component plots based on the chemical compositions of the Recent and fossil shells. Axis 1 has high negative loadings corresponding to P, Fe, and Sr, with a positive Na loading. Axis 2 has high negative loadings corresponding to S, Ca, and Fe, and a positive Sr loading. Axis 3 has a high negative loading corresponding to Mg and a positive Sr loading. Recent and fossil calcites are separated according to axis 3, whereas Recent and fossil aragonites are separated according to axis 1.
Fig. 2 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 2. Secondary electron images illustrating the microstructures of Recent shells. A. Dorsal shield of Sepia sp. (from New Caledonia), showing the thin inner prismatic layer, the nacreous layer and the thick multi−layered outer spherulitic prismatic layer. B. Outer wall of Spirula sp. (from New Caledonia), showing two prismatic layers and a mainly organic thin nacreous layer (arrow). C. Nautilus macromphalus (from New Caledonia). D. Nacreous layer of the pelecypod Pinna nobilis (from the Mediterranean Sea, Port Cros Island). E. Foliated calcite layer of Pecten maximus (from Brittany, France). F. Crossed lamellar aragonite layer of the gastropod Murex sp. (of unknown origin). Abbreviations: ip, inner prismatic layer; nac, nacreous layer; op, outer prismatic layer. All specimens from the UPS collection of Recent molluscs, not numbered.
Fig. 3 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 3. Secondary electron images illustrating the microstructures in Goniocamax sp. (A–D) and fossil molluscs (E–G); all samples from the Turonian of N Siberia. A. UPS−2435, adjacent calcitic and aragonitic zones; the growth lines are not clearly visible in the calcitic zones. B. UPS−2460, non−compact, thin calcite prisms. C. UPS−2459, aragonitic sectors with preserved growth lines. D. UPS−2460, growth lines in the well−preserved aragonite. E. UPS−2448, aragonite nacreous of an ammonite shell. F. UPS−2591, crossed lamellar layer of a fossil gastropod. G. UPS−2587, nacreous layer of an inoceramid shell.
Fig. 1 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 1. Two SEM images illustrating different aspects of Goniocamax sp. from the Turonian of Northern Siberia, Piasina River, Western Taymyr Peninsula. A. UPS−1483, polished and etched longitudinal section of a rostrum showing the aragonitic region (a, white) and the calcitic region (c, black). B. UPS−2451, longitudinal fracture showing a part of the phragmocone (p) with some septa visible, and rostrum (r).
Simulated diagenesis of the iron-silica precipitates in banded iron formations: Data Repository
<p>This XRD dataset derives from experiments we performed bubbling 49 ppm O2 into simulated Archean seawater and then aging the produced precipitates at 25 degrees C, 80C, 150C, and 220C. Precipitate slurries were extracted from experimental samples and pipetted as 20 µL subsamples into Cole-Parmer Kapton tubes to keep anoxic during XRD analysis. Samples were sent to McMaster Analytical X-Ray Diffraction Facility (MAX) for XRD analysis using a Bruker D8 DISCOVER cobalt source tube (Co-XRD) with a DAVINCI.DESIGN diffractometer. More details on methods in associated article. Resultant XRD measurements of our samples yielded patterns showing increasing crystallinity with temperature. The bubbled experiment aged for 40 days at 25 °C produced a large and diffuse diffraction peak corresponding to the Kapton tube but no other sharp diffraction peaks, suggesting an amorphous to minimally crystalline product. A broad peak in the 25 °C precipitate, that persisted through the higher-temperature aging treatments, may correspond to ferrihydrite. The bubbled experiment aged at 80C contained diffraction peaks consistent with a serpentine group silicate and a spinel group oxide (like magnetite). After the 150 °C treatment, samples showed sharper peaks consistent with a serpentine group silicate and spinel group oxide. After 220 °C aging, the precipitates showed a continued narrowing of the diffraction peaks for a spinel group oxide, reflecting an increase in crystal size and/or crystallinity, but smaller and less sharp serpentine group peaks. </p>
Data from: Stuck in the mud: experimental taphonomy and computed tomography demonstrate the critical role of sediment in stabilizing the three-dimensional external morphology of arthropod carcasses during early fossil diagenesis - DRAGONFLY sessions
Open the record for dataset details and reuse information.
Stuck in the mud: experimental taphonomy and computed tomography demonstrate the critical role of sediment in three-dimensional carcass stabilization during early fossil diagenesis - TIFF stack data
Open the record for dataset details and reuse information.
Constraining carbonate diagenesis using clumped isotope temperatures and U-Pb dating: a case study from the Gerze area in western central Tibet and implications for paleoelevation interpretations
<p>Data S1: clumped isotope data of new samples; Data S2: clumped isotope data of standards; and Data S32: carbonate LA-ICPMS U-Pb data</p>
Diagenesis decreasing the Mo isotopic composition in estuarine systems: Implications for constraining its riverine input to ocean
<p>Physical and chemical characteristics of water and particulate samples in the August and December 2014 cruises and characteristics of water samples from the July 2016 and February 2017 cruises.</p>
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OpenNeuro
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