V. JANOUSEK1,3, C. M. FARROW2, V. ERBAN3.
and J. SMID3
1 Institut für Mineralogie, Universität Salzburg, Austria
2 Computing Service, University of Glasgow, Scotland
3 Czech Geological Survey, Prague, Czech Republic (firstname.lastname@example.org)
The dearth of truly potent and flexible software for
recalculation and plotting of whole-rock analyses is often a limiting factor to
a creative scientific work in igneous geochemistry. An ideal package should
include a variety of calculation schemes, produce publication quality diagrams,
be readily available, easy to use and expand. The Geochemical Data Toolkit (GCDkit)
is being developed to meet this requirement, with facilities for handling and
recalculation of whole-rock major- and trace-element as well as Sr-Nd isotopic
data. It is built using the freeware R language, version for Windows (http://www.r-project.org)
which in itself provides a rich environment for data analysis, graphics and
Norman v. 2
NORMAN is a Microsoft QuickBasic 4.5 package designed for handling and recalculation of whole-rock major-element data on PC compatible computers. It is capable of computing parameters of the most common normative calculation schemes, including CIPW and Catanorm. The core of the system consists of modules to handle the import, editing and saving of the major-element analyses, as well as browsing, saving and exporting the computed results. The calculation algorithms are: (1) nearly independent QuickBasic programmes (”standard modules”), and (2) plain text calculation scripts (”user-defined functions”) that may contain variables referring to the original data, to constants as well as to parameters calculated by other standard modules and user-defined functions.
The advantage of the chosen approach is the simplicity, availability and open architecture that enables an average user not only to follow, but also, if need be, to modify the algorithms applied to his data.
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