This program is used for the recalculation of trivalent iron and the calculation of the occupations/activities in amphiboles. Pressure is calculated according to Johnson & Rutherford (1989). A temperature calculation is then carried out using the hornblende plagioclase thermometer according to Holland & Blundy (1994).
This is the \"Thermometer A\" version. For silica-saturated rocks both thermometers (A and B) may be applied: in silica-undersaturated rocks or magmas thermometer B alone can be applied.
Link to "Thermometer B": >Thermometer B
Recalculation of trivalent iron and calculation of occupancy/activities in amphiboles, as well as temperature calculation with the hornblende-plagioclase thermometer according to Holland & Blundy (1994).
Thermometer A, prevailing conditions: Temp.: 400-900°C; Plg < 0.9; Amph.: Na/A > 0.02; AlVI < 1.8 pfu; Si: 6.0-7.7 pfu
NB: As stated above, thermometer A can only be applied in silica-saturated rocks!
You can enter the values individually in the table or use the input fields. Here you enter the values as rows separated by single spaces (see placeholders; 200 characters max.). Note the order of the elements in the table! Additionally, the sample designation must come first and the sum last. You can use the period or the comma as a decimal separator.
Please enter the appropriate values!
|XAb > 0.5|
|XAb < 0.5|
You can either fill in the value manually or have it filled in automatically. Activate the control field if you want to use the automatic function.
If a value in the left column of group A is > 1, then this value is automatically set to 1 (light blue, right column). I.e. all of the iron is calculated as Fe²⁺.
If a value from group B is > 1, the amphibole cannot be calculated stoichiometrically!
An average between fA and fB (with fA > fB) is sought. If fB > fA, the analysis fails one of the above conditions for stoichiometry.
|fav from fA and fB||fav total|
|* cm = Cummingtonite substitution|
|T [K]||T [°C]|
Enter a title
Sample number, etc.