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5 results for “Neodymium isotopes”
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>
National Geochemical Survey of Australia: Samarium-Neodymium Isotopes Dataset
<p><strong>Preamble --</strong> The 'National Geochemical Survey of Australia: The Geochemical Atlas of Australia' was published in July 2011 along with a digital copy of the NGSA geochemical dataset (<a href="http://dx.doi.org/10.11636/Record.2011.020" target="_blank" rel="noopener">http://dx.doi.org/10.11636/Record.2011.020</a>). The NGSA project is described here: <a href="http://www.ga.gov.au/ngsa" target="_blank" rel="noopener">www.ga.gov.au/ngsa</a>. A recent review of the original and ensuing NGSA outputs and impacts can be found in Caritat (2022). The present dataset contains additional geochemical data obtained on NGSA samples: Samarium-Neodymium Isotopes Dataset. </p> <p><strong>Abstract --</strong> Ninety three coarse-fraction (<2 mm) Bottom Outlet Sediment (BOS, on average 60 – 80 cm depth) NGSA samples mostly from three continental-scale cross-sections (one central north-south cross-section, one central east-west, and one southern east-west) were analysed for the samarium (Sm) and neodymium (Nd) isotopes <sup>147</sup>Sm, <sup>143</sup>Nd, and <sup>144</sup>Nd to determine the <sup>143</sup>Nd/<sup>144</sup>Nd and <sup>147</sup>Sm/<sup>144</sup>Nd isotope ratios, initial epsilon Nd (εNd<sub>0</sub>), and single and two-stage depleted mantle model ages TDM and T2DM (in Ga or billion years). Together these samples represent over 490,000 km<sup>2</sup> of catchment area sourcing the sampled fluvial/alluvial sediments.</p> <p>The summary statistics for <sup>143</sup>Nd/<sup>144</sup>Nd and εNd<sub>0</sub> results are shown below.</p> <table> <tbody> <tr> <td>Stats</td> <td><sup>143</sup>Nd/<sup>144</sup>Nd</td> <td>εNd<sub>0</sub></td> </tr> <tr> <td>Min</td> <td>0.511014</td> <td>-31.68</td> </tr> <tr> <td>25%</td> <td>0.511550</td> <td>-21.22</td> </tr> <tr> <td>Median</td> <td>0.511817</td> <td>-16.02</td> </tr> <tr> <td>MAD</td> <td>0.000232</td> <td>4.53</td> </tr> <tr> <td>Average</td> <td>0.511802</td> <td>-16.31</td> </tr> <tr> <td>SD</td> <td>0.000342</td> <td>6.67</td> </tr> <tr> <td>75%</td> <td>0.512019</td> <td>-12.07</td> </tr> <tr> <td>Max</td> <td>0.512623</td> <td>-0.29</td> </tr> </tbody> </table> <p>The method is briefly summarised below.</p> <p>Samples were analysed at University of Melbourne (UOM) by Roland Maas and University of Alberta (UOA) by Rob Creaser.</p> <p>At UOM all analyses were by isotope dilution. Samples were dissolved at high pressure, and Sm and Nd extracted using Eichrom TRU- and LN-resin columns. Isotopic analyses were by Multi Collector Inductively Coupled Plasma Mass Spectrometer (MC-ICP-MS), with Nd mass bias corrected by internal normalisation to <sup>146</sup>Nd/<sup>145</sup>Nd = 2.0719425 (equivalent to <sup>146</sup>Nd/<sup>144</sup>Nd = 0.7219). In-run errors (2se) were ± 0.000010 or lower, external precision (2sd) ± 0.000020. All <sup>143</sup>Nd/<sup>144</sup>Nd results have been adjusted to LaJolla=0.511860. The TIMS reference for JNd-1 is 0.512117, and BCR-2 has a nominal <sup>147</sup>Sm/<sup>144</sup>Nd of 0.1382 and <sup>143</sup>Nd/<sup>144</sup>Nd of 0.512640 ± 20.</p> <p>At UOA rock powders were accurately weighed and totally spiked with a known amount of mixed <sup>150</sup>Nd-<sup>149</sup>Sm tracer solution and dissolved at high pressure for 5 days. Sm and Nd were extracted and separated by conventional cation and HDEHP-based chromatography (Creaser et al., 1997). Chemical processing blanks were < 120 picograms of either Sm or Nd, and are insignificant relative to the amount of Sm or Nd analysed for any rock sample. Isotopic analyses were determined in static mode by MC-ICP-MS (Schmidberger et al., 2007). All isotope ratios were normalized for variable mass fractionation to a value of <sup>146</sup>Nd/<sup>144</sup>Nd = 0.7219. The <sup>143</sup>Nd/<sup>144</sup>Nd ratio of samples are presented here relative to a value of 0.511850 for the La Jolla Nd isotopic standard, monitored by use of an in-house Alfa Nd isotopic standard for each analytical session. Sm isotopic abundances were normalized for variable mass fractionation to a value of 1.17537 for <sup>152</sup>Sm/<sup>154</sup>Sm. The mixed <sup>150</sup>Nd-<sup>149</sup>Sm tracer solution used was calibrated directly against the Caltech mixed Sm/Nd normal described by Wasserburg et al. (1981). Using this mixed tracer, the measured <sup>147</sup>Sm/<sup>144</sup>Nd ratios for the international rock standard BCR-1 ranged from 0.1380 to 0.1382, suggesting a reproducibility for <sup>147</sup>Sm/<sup>144</sup>Nd of ~ ± 0.1 % for real rock powders. The value of <sup>147</sup>Sm/<sup>144</sup>Nd determined for BCR-1 was within the range of reported literature values by isotope dilution methods.</p> <p>A full report on this dataset will be available shortly as a Geoscience Australia Record.</p> <p>REFERENCES CITED</p> <p>Caritat, P. de, 2022. The National Geochemical Survey of Australia: review and impact. Geochemistry: Exploration, Environment, Analysis, 22, geochem2022-032. <a href="https://doi.org/10.1144/geochem2022-032">https://doi.org/10.1144/geochem2022-032</a></p> <p>Creaser, R.A., Erdmer, P., Stevens, R.A. and Grant, S.L., 1997. Tectonic affinity of Nisutlin and Anvil assemblage strata from the Teslin tectonic zone, northern Canadian Cordillera: constraints from neodymium isotope and geochemical evidence. Tectonics, 16, 107-121. <a href="https://doi.org/10.1029/96TC03317" target="_blank" rel="noopener">https://doi.org/10.1029/96TC03317</a> </p> <p>Schmidberger, S.S., Heaman, L.M., Simonetti, A., Creaser, R.A. and Whiteford, S., 2007. Lu-Hf, in-situ Sr and Pb isotope and trace element systematics for mantle eclogites from the Diavik diamond mine: evidence for Paleoproterozoic subduction beneath the Slave craton, Canada. Earth and Planetary Science Letters, 254, 55-68. <a href="https://doi.org/10.1016/j.epsl.2006.11.020" target="_blank" rel="noopener">https://doi.org/10.1016/j.epsl.2006.11.020</a> </p> <p>Wasserburg, G.J., Jacobsen, S.B., DePaolo, D.J., McCulloch, M.T. and Wen, T., 1981. Precise determination of Sm/Nd ratio, Sm, Nd isotopic abundances in standard solutions. Geochimica et Cosmochimica Acta, 45, 2311-2323.</p>
Global data compilation of seawater, authigenic and detrital radiogenic neodymium isotope composition since the Last Glacial Maximum
<p>The global radiogenic Neodymium isotope data compilation from:</p> <div> <div>Du J., Haley B. A. and Mix A. C. (2020) Evolution of the Global Overturning Circulation since the Last Glacial Maximum based on marine authigenic neodymium isotopes. <em>Quaternary Science Reviews</em> <strong>241</strong>, 106396.</div> </div>
Neodymium isotopes as a paleo-water mass tracer: A model-data reassessment: Model Output Data
<p>This dataset contains model output for the simulations presented in <em>"Neodymium isotopes as a paleo-water mass tracer: A model-data reassessment, Quaternary Science Reviews 279 (2022), 107404".</em></p> <p>The NetCDF4 files contain the following variables:</p> <p>3D fields:</p> <ul> <li>Potential Temperature</li> <li>Salinity</li> <li>North Atlantic dye tracer</li> <li>Epsilon Nd</li> <li>Nd concentration</li> </ul> <p>2D field:</p> <ul> <li>AMOC stream function</li> </ul>
Multi-elemental and Strontium-Neodymium Isotopic Signatures in Charred Wood: Potential for Wood Provenance Studies
<p>Dataset used for article Anna Imbert Štulc et al. 2023. Multi-elemental and Strontium-Neodymium Isotopic Signatures in Charred Wood: Potential for Wood Provenance Studies. International Journal of Wood Culture 3 (2023): 1–48. DOI:10.1163/27723194-bja10019</p> <p>The depository contains dataset in csv format and descriptive note in txt forma. Dataset contains elemental concnetrations measured with quadrupole ICP-MS (LIEC laboratory, Nancy, France), relative elemental concentrations determined by XRF spectroscopy (SILVA laboratory, Nancy, France) and isotopic ratios 87Sr/86Sr and 143Nd/144Nd measured with multi collector ICP-MS (PARI platform at IPGP, Paris, France), for 59 wood samples.</p>
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