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'''Metamorphic series''' include the Barrovian and Buchan series of [[metamorphic rock]]s. [[George Barrow]] |
'''Metamorphic series''' include the Barrovian and Buchan series of [[metamorphic rock]]s. [[George Barrow]] was a geologist in Scotland who discovered the Barrovian series. <ref> {{cite web|url=https://www.tulane.edu/~sanelson/eens212/regionalmetamorph.htm |title= Regional metamorphism |publisher=Tulane University|access-date= 23 August 2019}}</ref>. 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 zone]]s, 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.<ref>Philpotts,A. and Klein,C. ''Earth Materials'', 2013, Cambridge University Press: New York, pp. 398–399.</ref>. |
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<br /><ref>Marshak, S.2015.''Earth: Portrait of a Planet'', pp. 245–249.</ref> |
<br /><ref>Marshak, S.2015.''Earth: Portrait of a Planet'', pp. 245–249.</ref> |
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[[File:Al2SiO5_phase_diagram.svg|Al2SiO5 phase diagram]] |
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[[File:Metamorphic Facies Series.png|thumb|In the figure above, one can study different metamorphic series for different rocks. Note, however, that the names Buchan and Barrovian facies series are often used in another context, i.e. for the kyanite-andalusite-sillimanite polymorphs. However, Buchan facies series plot along line 3 and Barrovian at somewhat higher pressure and with the appearance of kyanite.The facies series have connections to plate tectonics. Facies series 1 is typical of contact metamorphism, but also found in regional metamorphosed rocks. Facies series 2 correlates with volcanic arc environments, and so on: 3. Collisional mountain belts, regional metamorphism 4. Stable continents and 5. Accretionary prisms. Original image: Woudloper.]] |
[[File:Metamorphic Facies Series.png|thumb|In the figure above, one can study different metamorphic series for different rocks. Note, however, that the names Buchan and Barrovian facies series are often used in another context, i.e. for the kyanite-andalusite-sillimanite polymorphs. However, Buchan facies series plot along line 3 and Barrovian at somewhat higher pressure and with the appearance of kyanite.The facies series have connections to plate tectonics. Facies series 1 is typical of contact metamorphism, but also found in regional metamorphosed rocks. Facies series 2 correlates with volcanic arc environments, and so on: 3. Collisional mountain belts, regional metamorphism 4. Stable continents and 5. Accretionary prisms. Original image: Woudloper.]] |
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The Buchan and Barrovian facies series relate to this diagram of Al<sub>2</sub>SiO<sub>5</sub> polymorphs (also called a petrogenetic grid), with increasing temperature along the x-axis and increasing pressure along the y-axis. See [[Metamorphism#Regional]] |
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* Buchan metamorphism has the facies series greenschist-amphibolite-granulite |
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* Barrovian metamorphism has the same facies series but has approximately 1 kbar more pressure so these rocks form kyanite<ref>Tulane University</ref> |
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== References ==<!-- Inline citations added to your article will automatically display here. See en.wikipedia.org/wiki/WP:REFB for instructions on how to add citations. --> |
== References ==<!-- Inline citations added to your article will automatically display here. See en.wikipedia.org/wiki/WP:REFB for instructions on how to add citations. --> |
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Revision as of 10:49, 24 August 2019
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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]
The Buchan and Barrovian facies series relate to this diagram of Al2SiO5 polymorphs (also called a petrogenetic grid), with increasing temperature along the x-axis and increasing pressure along the y-axis. See Metamorphism#Regional
- 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.
- ^ Tulane University
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