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                     README.TXT

      Some Instructions of how to use "PTMAFIC"


            Created by J.I. Soto & V.M. Soto
      Instituto Andaluz de Ciencias de la Tierra
           C.S.I.C.-Granada University
        Campus Fuentenueva, 18008-Granada (Spain)

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STARTING UP

     For faster operation, if you have a hard disc, create a directory
with the name "PTMAFIC" and copy the following files to it:
     - PTMAFIC.EXE
     - PORTADA.SCR
     - README.TXT and
     - REFEREN.TXT.
Once in the PTMAFIC directory, or, if you do not have a hard disc, in
the disc-drive containing the program disc, type "PTMAFIC" in order
to begin your work session with the program.


HOW TO MOVE ABOUT THE MENUS

     The opening screen of the program gives the software
presentation and author address. Press "Return" twice to move to the
Main Menu.

     Use the right and left cursor arrows to move about inside the
Main Menu. The up and down arrows are used to move from one
pull-down menu to another. The "Return" key activates the chosen
option. Press "Escape" to unselect a submenu in the pull-down
menus.


MAIN MENU

     The Main Menu contains the following four options:

     - SYSTEM: includes the options "SHELL", for a temporary exit
     to system (type "Exit" to return), and "QUIT", to end the
     process and leave the program.

     - GEOTHERMOMETERS: provides an alphabetical list of the
     minerals involved in the 15 geothermometers included in the
     program. A submenu is available for each, which includes the
     mineral assemblages that make up the different
     geothermometers. Please observe that in some options the
     program includes two geothermometers (e.g. Cpx-Ol and Opx-
     Ol-Spl in "Cpx-OlSpl" option). Different calibrations are made
     of the two geothermometers, depending on whether the
     mineral appearing after the "+-" symbol is introduced or not. If
     you do not wish to introduce this mineral, simply leave the first
     two variables of this phase with zero values.

     - GEOBAROMETERS: this has the same characteristics as the
     preceding option, containing 12 barometers. Please notice that
     the assemblages with clinopyroxene and orthopyroxene now
     appear inside the same option, entitled "Pyroxenes".

     - ACTIVITIES: This menu includes 8 minerals from which
     different thermodynamic (e.g. Margules parameters, activities
     and activity coefficients) and stechiometric (e.g. mole%, molar
     fractions and cation allocations) parameters can be obtained.


ERROR MESSAGES

     So that calculation problems do not cause immediate close
down of the program, the following error message appears, together
with a high-pitched beep: <Error num. 11: 'division by zero'>. Press
the "Return" key to continue with the program.


REFERENCES

     All the references used in the calculation and programming of
PTMAFIC appear on result screens and the user can find them in
alphabetical order in REFEREN.TXT. In this file the references are
classified in two groups: "Thermobarometry" and "Activity-references".
All the abbreviations of minerals and solid solution end-members
used by the program are those proposed by Kretz (1983).


FINALLY

     The author will be glad to receive any suggestions from users
proposing improvements or if this version of PTMAFIC does not
contain calibrations or models which they normally use.
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