# Metamorphic series

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**Metamorphic series** include the **Barrovian** and **Buchan** series of [metamorphic rocks](/source/Metamorphic_rock). [George Barrow](/source/George_Barrow_(geologist)) was a geologist in Scotland who discovered the Barrovian series.[1] These are also called **metamorphic facies series**. A [metamorphic facies](/source/Metamorphic_facies) series is a sequence of metamorphic facies which plot in a temperature-pressure diagram along a line, and this line represents a certain geothermal gradient. They are not the same as [metamorphic zones](/source/Metamorphic_zone), as these are defined as a region on a geological map where the pressure-temperature conditions for an [index mineral](/source/Index_mineral) (a mineral that indicates the approximate metamorphic grade of a rock), were appropriate for these minerals to form.[2][3]

- Buchan metamorphism has the facies series [greenschist](/source/Greenschist)-[amphibolite](/source/Amphibolite)-[granulite](/source/Granulite)
- Barrovian metamorphism has the same facies series but has approximately 1 kbar more pressure so these rocks form [kyanite](/source/Kyanite)[4]

## References

1. ["Regional metamorphism"](https://www.tulane.edu/~sanelson/eens212/regionalmetamorph.htm). Tulane University. Retrieved 23 August 2019.

1. Philpotts,A. and Klein,C. *Earth Materials*, 2013, Cambridge University Press: New York, pp. 398–399.

1. Marshak, S.2015.*Earth: Portrait of a Planet*, pp. 245–249.

1. Tulane University

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