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elmin

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Everything posted by elmin

  1. Thanks! I did as you say and it seems to work well with my expectations. I have another question though. Suppose I do the above, react a fluid with quartz, and then want to take that fluid composition and react it with the same mineral suite at a different pressure? I have two separate thermo datasets for the two pressures I want to work with, but I couldn't find anything on saving and importing a fluid composition for react. What would I do in this case?
  2. Hi all, I'm trying to look at what happens when 1 Kg pure water at 300 C and 2000 kBars interacts with a large quantity of Granite, Slate, and pure quartz. I have the mineral assemblage percentages for both Granite and Slate, but I'm not quite sure what program in GWB to use. I would like to get measurements on the SI indexes of various minerals, pH, alkalinity, salinity, and of course the resultant fluid composition. I have a working thermo database for this T & P range.
  3. Good Morning all! I'm a fifth year ESS & Phys major working on a project for my Geochemistry course. I'm interested in what happens to mineral solubilities when a hydrothermal fluid experiences a range of pressure drops (anywhere from Pi = 2kB ==> 1kB or as far as 1kB ==> 10 Bars) while remaining at a temperature of 300 C. I've tried to use DBCreate to create this thermo database for use with GWB, but for some reason all the log K's of reaction in the new database are identical. As the DBCreate paper was not very straightforward for someone with a very limited understanding of supcrt and previous work on tabulating thermo data in the geosciences, It was quite difficult to get DBCreate to work at all. I was able to create a database with identical log K's at all the P & T by the following procedure: 1. Open dbcrt: type in 1, 1, data0.dat, and then dpeq06.dat 2. Open supcrtgrid type in dpeq06.dat, use my modified fCON file (with pressures initially in the one phase region), and then type in the prefix of all the files made in part 1. 3. Open dbcrt: type in 2, 2, thermo.com.dat, outputfilename But the output file is completely useless as all the Log K's are the same -__-- What did I do wrong? What do I need to do to create a database that will work for me? I'm quite lost. Attached are the fCON and output database files that I used/created. fCON.txt newpt.zip
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