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An Excel spreadsheet to recast analyses of garnet into end-member components, and a synopsis of the crystal chemistry of natural silicate garnets
- Source :
-
Computers & Geosciences . Dec2008, Vol. 34 Issue 12, p1769-1780. 12p. - Publication Year :
- 2008
-
Abstract
- A Microsoft Excel spreadsheet has been programmed that allows users to calculate with ease the molar proportions of garnet end-members from chemical analyses. Recent advances in the understanding of the crystal chemistry of natural garnets, especially of the Ti-bearing garnets, are used to evaluate 29 end-members (15 species and 14 hypothetical end-members) for each analysis. The amounts of Fe2+ and Fe3+ (and Mn3+, if necessary) are calculated by stoichiometric constraints if these quantities have not been measured. The input data can include: SiO2, TiO2, ZrO2, SnO2, Y2O3, Al2O3, Sc2O3, Cr2O3, V2O3, FeO, Fe2O3, MnO, MgO, CaO, Na2O, H2O+ and F. The spreadsheet can be used with large data sets (up to 100 analyses at a time), and is accompanied by results calculated for 470 garnet analyses taken from the literature. The spreadsheet employs a simple scoring algorithm to measure the quality of a garnet analysis. The propagation of error from the input chemical data to the calculation of end-member proportions is also discussed briefly. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00983004
- Volume :
- 34
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Computers & Geosciences
- Publication Type :
- Academic Journal
- Accession number :
- 34439944
- Full Text :
- https://doi.org/10.1016/j.cageo.2007.12.013