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A simple garnet-plagioclase barometer
This simple program serves for estimating metamorphic pressure with the help of geochemical analyzes (microprobe) of rocks. The pressure is estimated according to GHENT & STOUT (1981) and HODGES & SPEAR (1984) using the minerals garnet, biotite, muscovite and plagioclase. The temperature can be chosen freely.
The barometer
Enter your data in the fields below.
You can enter the values individually in the fields or use the input fields. Here you enter the values as rows separated by single spaces (see placeholders). 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.
Garnet
Name
SiO₂
TiO₂
Al₂O₃
Cr₂O₃
Fe₂O₃
MgO
CaO
MnO
FeO
Total
Cations O=24
Si
Ti
Al
Cr
Fe³⁺
Mg
Ca
Mn
Fe²⁺
Total
Biotite
Name
SiO₂
TiO₂
Al₂O₃
Cr₂O₃
MgO
CaO
MnO
FeO
BaO
Na₂O
K₂O
H₂O
Total
Cations O=22
Si
Ti
Al
Cr
Mg
Ca
Mn
Fe
Ba
Na
K
Total
Muscovite
Name
SiO₂
TiO₂
Al₂O₃
Cr₂O₃
MgO
CaO
MnO
FeO
BaO
Na₂O
K₂O
H₂O
Total
Cations O=22
Si
Ti
Al
Cr
Mg
Ca
Mn
Fe
Ba
Na
K
Total
Plagioclase
Name
SiO₂
Al₂O₃
MgO
CaO
MnO
FeO
BaO
Na₂O
K₂O
Total
Cations O=8
Si
Al
Mg
Ca
Mn
Fe
Ba
Na
K
Total
Click to see your data in a simplified PT-diagram
P1 GHENT & STOUT: Yellow with red rim
P2 GHENT & STOUT: Red
HODGES & SPEAR: Blue
Captions
D: Diagenesis — Z: Zeolite — H: Hornfels — S: Sanidinite — P/P: Prehnite-pumpellyite — GS: Greenschist — A: Amphibolite — G: Granulite — B: Blueschist — E: Eclogite
Download data
Current date
Enter a title
Sample number, etc.
Download data file (*.csv)