Hi Paula.
Like Sara, I am also really new to MELTS, and have got half way through the adiabat_1ph tutorial before I got stuck.
I have installed Perl, and I am running through the Command Prompt on Windows. I put the contents of the MELTS folder into my default command prompt folder, so I don't have to reset my defaults.
I am stuck on step 4 of the tutorial (choice 10) where I am to 'find the liquidus' in phase diagram mode. I re-downloaded the files, and still can't find my error. Instead of the correct output from the tutorial:
Quote
Your choice: 10
... etc...
Enter 1 for special upwards-only search for troublesome phases: 0
...Adding the solid phase feldspar to the assemblage.
... etc ...
...Quadratic convergence accepted, but non-optimal.
...Dropping phase feldspar from the assemblage.
Isograd solution at: P 500.000000, T 1493.349219
liquid: 100.350 g 48.51 1.01 17.58 0.89 0.03 7.56 9.07 12.41 2.64 0.03 0.08 0.20
Activity of H2O = 0.0179036
Return to menu now (1) or increment P and continue calculations (0)? 1
The output file I get, following the same steps, reads as follows.
Quote
Your choice: 10
... etc...
Enter 1 for special upwards-only search for troublesome phases: 0
...Adding the solid phase feldspar to the assemblage.
...Adding the solid phase olivine to the assemblage.
Initial Guess (not an isograd solution): P 500.000000, T 1473.150000
liquid: 82.239 g 49.00 1.23 15.85 1.08 0.04 8.49 8.71 12.39 2.83 0.04 0.10 0.24
Activity of H2O = 0.0266901
...etc...
...Dropping phase feldspar from the assemblage.
...Adding the solid phase feldspar to the assemblage.
...Dropping phase feldspar from the assemblage.
...Adding the solid phase feldspar to the assemblage.
...Dropping phase feldspar from the assemblage.
...Adding the solid phase feldspar to the assemblage.
...Dropping phase feldspar from the assemblage.
THE QUADRATIC MINIMIZATION ALGORITHM HAS FAILED TO CONVERGE.
...Quadratic convergence failure. Aborting.
Not all calculations performed!
I don't know what I did wrong, and am at a loss as to where to go from here.
Have you seen this before, or do you have any suggestions.
I have also attached a copy of the full command line input/output as a txt document if my above quote isn't clear.
Thanks very much.
Sincerely,
Matthew Coble