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 exponential equation was fit to this average pattern using Igor Pros builtin curve fitting function, which incorporates calculated uncertainties on. 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. Group with the goal of holding an initial meeting before the end of 2016.
IGOR PRO CURVE FITTING HOLD CONSTACT PROFESSIONAL
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. Iam using Blogspot as my professional platform. CURVE FITTING 1) Go to the 'Analysis' menu on the tool bar and select 'Curve Fitting.' 4 2) Select the appropriate fitting function from the function list. holding down the command, option and control keys. An automatic procedure was applied to fit with a Gaussian curve the power. 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. Igor is also capable of dealing with data that does not fit the waveform metaphor. Igor Pro built-in function DSP Periodogram was applied on each binned trace to. In addition to Sm and Nd isotopes, the MC-ICP-MS is configured to also acquire Ce, Nd, Sm, Eu, and Gd elemental abundances. In iolite 3, sessions were saved as Igor Pro packed experiment pxp files. Ablated material is split using a Y-connector and transported simultaneously to both mass spectrometers. If that happens, you can hold down shift while starting iolite to reset some. The curve fitting procedure, written in Igor (Igor Pro 6.12a).
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. In each curve fitting the charge ratio was held constant, e.g. 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.
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