Initial Publication Date: August 10, 2007
Metamorphic P-T Phase Diagrams
Click on an image or the link in the caption, and a PDF file of the diagram will download to your computer. Some of the PDF files are animations -- they contain more than one page that can be shown in sequence to see changes as temperature or some other variable changes.
Unless otherwise noted, these figures were drafted by Dexter Perkins or John Brady.
Unless otherwise noted, these figures were drafted by Dexter Perkins or John Brady.
1-Component Systems
PT diagram for the system SiO2 based on Swamy and Saxena (1994).Download PDF (Acrobat (PDF) 17kB Mar31 07)
PT diagram for the system Al2SiO5 based on Holdaway (1971).Download PDF (Acrobat (PDF) 21kB Oct12 07)
MgO-Al2O3-SiO2
These phase diagrams are based on calculations made using Rob Berman's TWQ software and database.
This pdf animation includes several different phase diagrams depicting phase relationships in the system MgO-Al2O3-SiO2. The first considers only four minerals. Additional minerals are added one-by-one. Most of the reactions on the first few diagrams are metastable because enstatite and corundum are not considered.Download PDF (Acrobat (PDF) 43kB Jun6 07)
CaO-MgO-SiO2-H20 (ultramafic rocks)
These phase diagrams are based on calculations made using Rob Berman's TWQ software and database.
Animated PDF showing changes in minerals assemblages during progressive metamorphism in the CaO-MgO-SiO2-H2O system.
Download PDF (Acrobat (PDF) 102kB May26 07)
P-T diagram showing compatibility diagrams in the system CaO-MgO-SiO2-H2O.
Download PDF (Acrobat (PDF) 32kB May26 07)
Schematic P-T diagram showing several low temperature reactions in the system CaO-MgO-SiO2-H2O, with compatibility diagrams.
Download PDF (Acrobat (PDF) 20kB May26 07)
Schematic pseudosections for low temperature reactions in the system CaO-MgO-SiO2-H2O. Bulk composition (red dot in triangle) is near that of typical mantle peridotites.
Download PDF (Acrobat (PDF) 18kB May26 07)
Schematic pseudosections for low temperature reactions in the system CaO-MgO-SiO2-H2O. Bulk composition (red dot in triangle) is more SiO2-rich than most mantle peridotites.
Download PDF (Acrobat (PDF) 21kB May26 07)
Schematic pseudosections for low temperature reactions in the system CaO-MgO-SiO2-H2O. Bulk composition (red dot in triangle) is more SiO2-rich than most mantle peridotites.
Download PDF (Acrobat (PDF) 17kB May26 07)
Pseudosection (CaO-MgO-SiO2-H2O system) for a composition near to that of typical mantle peridotites.
Download PDF (Acrobat (PDF) 22kB May26 07)
Al2O3-SiO2-H20
These phase diagrams are based on calculations made using Rob Berman's TWQ software and database.
Animated PDF showing changes in minerals assemblages during progressive metamorphism in the system Al2O3-SiO2-H2O.
Download PDF (Acrobat (PDF) 73kB May27 07)
CaO-Al2O3-SiO2
These phase diagrams are based on calculations made using Rob Berman's TWQ software and database.
CaO-Al2O3-SiO2-H20
These phase diagrams are based on calculations made using Rob Berman's TWQ software and database.
