![]() The U-Pb ages and Sm-Nd isotopic data from the LASS method support the conclusions drawn from previous results that monazite can record timing and information about the source region(s) of hydrothermal fluids. The LASS method is then applied to mona-zite from the Birch Creek Pluton in the White Mountains of California as a case study to illustrate the utility of this method for solving geologic problems. The accuracy of the Sm-Nd method is assessed by comparing the LA-MC-ICP-MS results with ID-TIMS determinations on a well-characterized, in-house monazite reference material. The LASS results agree within uncertainty with the isotope dilution thermal ionization mass spectrometry (ID-TIMS) U-Pb dates. autocorrelation function can be fit to different functional forms to. Evidently, my \( \chi \) by eye method was pretty good for the slope, but was off a bit in the offset. The result of performing this least-squares fit is shown in the red curve in the figure. parameters fit to arbitrary subsets hold. with Igor Pro (Wavemetrics, Inc.) that allow fast data reduction and analysis for. Igor Pro can perform the operation of finding the line or curve that minimizes \( \chi2 \). Make an alias (Macintosh) or shortcut (Windo ws) for your Igor64 application file and put the alias or shortcut on your desktop. This will allow you to simultaneously fit multiple datasets using linked parameters. (to load this at IGOR startup place a shortcut to the ipf file in the IGOR procedures folder) If you want to perfom Simulataneous fitting then also load up Motofit globalfit2.ipf. exe extensions may be hidden on your system. Access the GUI by selecting Motofit->Genetic Curvefitting. Precision and accuracy of the U-Pb method (and the precision of the Sm-Nd method) is demonstrated with results from well-characterized monazite reference materials. An Igor Pro graph is a powerful tool for data exploration, analysis and presentation: graphs quickly display. C:\Program Files\WaveMetrics\Igor Pro 7 Folder\IgorBinaries圆4\Igor.exe (Windows) The. This approach provides age, tracer isotope, and trace element data in the same ablation volume, reducing sampling problems associated with fine-scale zoning in accessory minerals and minimizing the material needed for ablation. In addition to Sm and Nd isotopes, the MC-ICP-MS is configured to also acquire Ce, Nd, Sm, Eu, and Gd elemental abundances. Ablated material is split using a Y-connector and transported simultaneously to both mass spectrometers. In fact in Igor, there is a built-in function called global fit that does the. This method uses a laser ablation system coupled to a magnetic-sector inductively coupled plasma mass spectrometer (HR) (ICP-MS) for measuring U-Pb isotopes and a multicollector (MC) ICP-MS for measuring Sm-Nd isotopes. The global fit to all three curves would produce one decay constant and. exe extensions may be hidden on your system. Results are presented for in situ simultaneous determination of U-Pb and Sm-Nd isotopes in monazite using the Laser Ablation Split-Stream (LASS) method. C:Program FilesWaveMetricsIgor Pro 7 FolderIgorBinaries圆4Igor.exe (Windows) The. ![]()
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