Ptrap calculation

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The Calc Ptrap tab is for calculating the entrapment pressure of the inclusion when you know the final pressure in the inclusion at another P and T.


Enter the  final conditions in the boxes:





The entrapment pressure cannot be determined uniquely with the isotropic elasticity model for host-inclusion systems. It can only be calculated if the entrapment temperature is known. Set a range of entrapment temperatures from Tmin to Tmax in steps of Tstep.


Press the Calculate button to get the results. Warning: the results are only displayed in the information panel when you press this button!



The information panel shows:



If the program is run in expert mode, you will also see the intermediate pressures calculated with several different models for relaxation from the literature. The entrapment isomeke is always reported for the exact model (#5).



Pthermo input


You can also calculate entrapment pressures from estimates of Pthermo instead of Ptrap. This allows you to use inclusion pressures unrelaxed by calculations in external programs, for example if you have a FE model of the inclusion from which you have calculated the relaxation.


To input a value of Pthermo instead of Pinc, just untick the box next to the 'Pinc' input, and you will see the label change to 'Pthermo'. Input 'Pthermo' and hit the 'Calculate' button:




Read Pinc or Pthermo from file


You can also calculate entrapment isomekes from a series of P (or Pthermo) values in a text file: