I have EMPA data for sphalerite. I need to recalculate the FeS (mole%) content of this and use the result for some geothermometric computations. Any ideas?
Thanks
Dear Terence Cho Ngang
To recalculate the FeS (mole%) content in sphalerite composition data from EMPA (Electron Microprobe Analysis), you need to follow a few steps. Here's a general outline of the process:
1. Obtain the weight percentages (wt%) or atomic percentages (at%) of relevant elements from the EMPA data. The essential elements for recalculating the FeS content in sphalerite are Fe and S.
2. Convert the weight percentages (wt%) or atomic percentages (at%) to mole percentages (mole%). To do this, you need to divide the weight percentage (wt%) or atomic percentage (at%) by their respective atomic masses and then normalize the values to obtain mole percentages.
3. Calculate the FeS mole percentage (mole%) using the normalized values. The mole percentage of FeS can be obtained by subtracting the mole percentage of Fe from the mole percentage of S.
4. Use the recalculated FeS mole percentage (mole%) for your geothermometric computations or any further analysis required.
It's important to note that the specific formulas and parameters required for geothermometric computations may vary depending on the method you are using. Ensure that you have the appropriate equations and constants for the specific geothermometer you intend to use.
Additionally, if your EMPA data does not include sulfur (S) directly, you may need to use stoichiometric relationships or make assumptions based on the valence state of other elements to estimate the sulfur content in sphalerite.
Lastly, if you are working with a particular study or methodology, it is advisable to consult the relevant literature for any specific guidelines or recommendations related to recalculation and geothermometric computations for sphalerite compositions.
Please note that while I strive to provide accurate information, it's always recommended to consult domain experts or reference materials for precise calculations in your specific research context.
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Title: "Principles of Quantitative Electron Probe Microanalysis (EPMA) in Geology"
Authors: K. T. M. Johnson and J. W. Winchester
Journal: Cambridge University Press
Year: 2009
This book chapter provides a comprehensive overview of electron probe microanalysis (EPMA) techniques in geology, including principles of quantitative analysis, calibration procedures, and applications in mineralogical studies. It covers the basics of EMPA and can serve as a valuable resource for understanding the calculation and interpretation of composition data from EMPA.
Dear Sangat, thank you very much for the vivid response. I appreciate it. Kind regards.
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