Metamorphism Diagrams


(Depending upon your printer, you may have to adjust your page and/or printer settings to make a print out of the following diagrams.  These adjustments may include things like page orientation, page reduction (80% vs. 100%), color vs. grayscale, etc.  If in doubt, do a print preview prior to printing!)  I recommend either color or grayscale for these images.


A)  Regional Metamorphism

Regional Metamorphism

 

B)  Contact Metamorphism [and contact Aureoles]

Contact Metamorphism and Contact Aureoles

Figure 3.5

Press and Siever:  Understanding Earth    Copyright  C 1994 W. H. Freeman and Company

 


 

Metamorphic Environments

Metamorphic Environments and General Metamorphic Types

Figure 8.2

Press and Siever:  Understanding Earth     Copyright  C 1994 W. H. Freeman and Company

 


 

23 Earth's Crust During Metamorphism       

Figure 7.9

Plummer, Charles C., and David McGeary, Physical Geology, 6/e Copyright C 1993 Wm. C. Brown Publishers, Dubuque, Iowa.  All Rights Reserved.


The previous diagram shows the gradual increase in metamorphic grade (intensity) with depth in an environment affected by regional metamorphism.  Also shown are some of the different foliation type.

 


 

 

 

 

 

 

The following diagram depicts the temperature and pressure conditions for different metamorphic environments.

Temperature and Pressure Conditions

Figure 8.11

Press and Siever:  Understanding Earth  Copyright C 1994 W. H. Freeman and Company

 


Keep Scrolling Down!

 

 

 

 

 

 

 

 

Matamorphic Facies and their Temperature/Pressure Conditions

The previous diagram depicts various Metamorphic Facies and their Temperature and Pressure Environments.  A metamorphic FACIES includes all of the rocks and minerals that form in a given metamorphic environment under specific temperature and pressure conditions.  They are usually named for their most common rock type or mineral. 

 

The following diagram depicts these facies in relation to common metamorphic environments, e.g. normal geothermal conditions vs. subduction zones.

Metamorphic Facies and their corresponding Metamorphic environment, e.g. Subduction zones vs. natural Geothermal conditions.

Figure 8.13, 8.16

Press and Siever:  Understanding Earth    Copyright C 1994 W. H. Freeman and Company

 


 

Metamorphic Grade and the corresponding Facies and Index Minerals

The previous diagram correlates metamorphic intensity with metamorphic facies and their corresponding index minerals.

 

The following diagram depicts a geologic map of different rock types which represent different metamorphic intensities. These differences are indicated by the presence of index minerals.  These different rock types are separated by isograds (lines representing the same pressure/temperature grade.)  On either side of these ISOGRADS the temperature and pressure conditions are different.

Geologic map depicting different metamorphic rocks separated by ISOGRADS 

Figure 8.10  [A) and B)]

Press and Siever:  Understanding Earth   Copyright  C 1994 W. H. Freeman and Company

 


 

The influence of different parent rocks on rocks of different metamorphic facies.

 


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