2025 Codopi REE inverse model
The Spider modeling options now include a REE inverse model called Codopi. See publication below and find two new documents in Documents>IgpetDocs>REEINV> "Guide to CoDoPi" and "Synthetic melt suites for Codopi".
2024 improvements
Igpet has improved symbol capability. Symbol files (*.sym.txt) can be customized so that each symbol has its own line width and a scale factor (between 0.2 and 2.) Scale factor allows small, medium and large forms (e.g. triangles). Line widths now can be modified. IBMPalette.sym.txt is new, it is appropriate for colorblind persons.
tIgpet versus Igpet
tIgpet is software for Windows and Mac computers. Igpet models common Igneous processes including, fractional and equilibrium crystallization, a variety of partial melting models, assimilation and magma mixing. The t indicates that this version of Igpet is free. The free version is intended for students but also for trial use by professionals who are considering purchasing the professional version of Igpet. The tIgpet version provides bit-mapped diagrams whereas the professional version provides vector diagrams (PDFs) that can be modified easily in illustration programs such as Adobe Illustrator, CorelDraw or Inkscape. The Windows and Mac versions are identical.
Purpose
Igpet makes it easy to examine and analyze a comprehensive Igneous data set. Examination starts with simple diagrams that provide IUGS recommended nomenclature (TAS and QPAF diagrams) and other common discrimination diagrams such as AFM and SiO2 versus K2O. Numerous other diagrams attempt to define the tectonic setting of rocks using weathering resistant trace elements.
After identifying the rocks, the next step is to determine the igneous processes responsible for the variation within a rock suite and the suite's overall composition. By comparison with published examples, many igneous processes can be tentatively identified. However, numerical testing of hypotheses is essential and Igpet makes this easy. Theses and research reports at all levels will be strengthened by the tools provided in Igpet.
Suggestions for use
Four useful documents are available. Before installing the software, please at least glance at supporting documents; two Publications, the Manual and the Workbook. Notice that the Manual has a Tutorial starting on Page 1. The Tutorial is the easiest way to learn to use the software. All software requires a learning curve, try the Tutorial, it will save you time and expose you to most of the tools in Igpet.
Two appendixes to the Manual attempt to describe advanced features and explain the inner workings of Igpet. Most of the algorithms in Igpet came from the equations in Introduction to Geochemical Modeling (Albarede, 1995) so Igpet is a toolbox for implementing basic numerical petrology/geochemistry.
The Workbook (written in 2016) is an attempt to show how to use Igpet. It has a dozen exercises that span entry level to advanced use. Consider the Workbook a valuable extension of the Tutorial because it leads you through most of the advanced features of Igpet and emphasizes that forward models can prove hypotheses wrong but, by their nature, do not lead to a single correct answer.
Igpet Publications
Please download this article and cite it if appropriate.
Carr, MJ, and E Gazel, 2017. Igpet software for modeling igneous processes: examples of application using the open educational version. Miner Petrol 111:283–289 DOI 10.1007/s00710-016-0473-z
Get the following article from G-cubed.
Carr, M. J., Feigenson, M. D., & Gazel, E. (2024). A REE inverse model from bulk distribution coefficients and boundary conditions: Results for shield and rejuvenated stage Hawaiian volcanoes. Geochemistry, Geophysics, Geosystems, 25, e2024GC011651. https://doi.org/10.1029/2024GC011651
Finally, the computer code for some modeling calculations in Igpet are provided as text (.txt) files in the Xojo language, an object oriented language that evolved from BASIC. Spimix code Spimod code
Installation Instructions
Mac software
Security rules require installation of two folders; one to Applications, another to Documents.
1. Download tIgpet-May-2025.dmg
2. Double-click the dmg. A disk image called Install-tIgpet-2025 should appear on the desktop. Inside are two folders.
3. Move the IgpetDocs folder to your Documents folder. It MUST be placed there for Igpet to locate critical information.
4. Move the Igpet Apps folder to Applications and open it. There are three Apps. It is a good idea to make aliases for the Apps and copy them to the Desktop or the Dock.
5. Read the Manual! The IgpetManual is a pdf file in the IgpetDocs folder. Read it, especially p 21; Common Problems
6. Starting with Mac OS Catalina, all Apps had to be Notarized and the Igpet Apps have been submitted and approved. Notarization means Apple has examined the compiled code of an App and detected no malware. The first time you run each of the Apps, you will get Apple’s notarization statement. You may also be asked if the App can use the Documents folder. Click Allow.
Windows software
Downloads are: Windows Installation Instructions (read this first)
Install-tIgpetwin-Oct-2025.zip Download it and unzip it.
First, read the Installation Instructions.
Follow the instructions.
To make Desktop icons, open File Explorer and navigate to this folder:
C:\Program Files\tIgpet-win
Make shortcuts for CIPW, Mixing and tIgpet-win. Place the shortcuts on the desktop or wherever you like.
Read the Manual! The IgpetManual is a pdf file in the IgpetDocs folder
Read the Manual, especially, Common Problems