Phase Diagrams (and Pseudosections) for Petrologists

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Standard phase diagrams are graphical representations of the equilibrium relationships between minerals binary phase diagram pdf others phases. These relationships are governed by the laws of thermodynamics. Standard phase diagrams show how phases or phase assemblages change as a function of temperature, pressure, phase composition, or combinations of these variables.

Some phase diagrams those for 1-component diagrams depict relationships involving multiple phases having the same composition for example, the relationships between the vapor, liquid and solid forms of H 2 O.

Other diagrams such as the one shown on the rightdepict the relationships between a number of compounds having different compositions. Still others binary phase diagram pdf how compositions of phases change under different conditions. Pseudosections are a type of phase diagram that shows the fields of stability of different equilibrium mineral assemblages for a single bulk-rock composition. Standard phase diagrams may include many reactions but, depending on its composition, a particular rock may only experience a few binary phase diagram pdf none of them.

Pseudosections only include those reactions that affect a particular composition. Fields on a pseudosection are labeled specifying the equilibrium mineral assemblage with the reaction lines unlabeled although the specific reaction can be deduced. This is a diverse collection of phase diagrams, intended to be used by instructors when teaching petrology or mineralogy classes.

These temperature-composition TX diagrams show melting relationships, and some subsolidus relationships, involving two chemical components. Some involve incongruent melting; most do not. Some of these diagrams involve eutectic and peritectic relationships.

Download binary phase diagrams. Ternary igneous phase diagrams are triangular diagrams that show melting relationships involving three chemical components. The diagrams may involve eutectic, peritectic and cotectic relationships. Download ternary phase diagrams. Natural metamorphic systems may involve many chemical components.

To simplify analysis and interpretation, petrologists may study model systems containing only a few components. Some of the binary phase diagram pdf available here involve only a few components and binary phase diagram pdf few phases. Others are more complex. Phase diagrams that binary phase diagram pdf many reactions that take place in a single chemical system are termed "petrogentic grids.

The idea is to include enough components and phases so that the grid may be used to interpret natural metamorphic mineral assemblages. Download metamorphic P-T phase diagrams. For some rock compositions, metamorphic assemblages vary greatly depending on the composition of the fluid present. CO 2 can control mineral stability.

So, phase equilibria are plotted on T-X diagrams instead of P-T diagrams. X refers to the mole fraction of 2 or H 2 O in the metamorphic fluid that is present. Download metamorphic T-X phase diagrams.

The above examples are of phase diagrams commonly used by geologists. Phase diagrams are also useful in other fields, including chemistry and engineering.

Binary phase diagram pdf, Colgate University and Gregory T. Timing of Mineralization in the Palm of your Hand: Most of the thumbnail images are jpg files. However, we provide links to pdf binary phase diagram pdf of all diagrams. They can be viewed, printed, or edited with Adobe Illustrator or Corel Draw. An easy way to do this is to open the files using Acrobat or its equivalent and then save them as eps files or in some other format that your graphics program can import.

Besides single page diagrams, we also provide animations for some of the more useful systems. The animations are multi-page pdf files. April 03, Binary phase diagram pdf Shortcut:

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