Metamorphic series include the Barrovian and Buchan series of metamorphic rocks. George Barrow was a geologist in Scotland who discovered the Barrovian series.[1] These are also called metamorphic facies series. A 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, as these are defined as a region on a geological map where the pressure-temperature conditions for an 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-amphibolite-granulite
Barrovian metamorphism has the same facies series but has approximately 1 kbar more pressure so these rocks form kyanite[4]
References
^ "Regional metamorphism". Tulane University. Retrieved 23 August 2019.
^Philpotts,A. and Klein,C. Earth Materials, 2013, Cambridge University Press: New York, pp. 398–399.
^Marshak, S.2015.Earth: Portrait of a Planet, pp. 245–249.