September 5-19, 2010
Prof. Richard White
Dr. Tim Johnson
Regional metamorphism in the Dalradian
(click on map to open a detailed version in a new tab)
The Buchan Facies Series of regional metamorphism is characterized by the widespread development of andalusite and cordierite in metapelitic rocks, indicating that the conditions of metamorphism were at lower P than those of the Barrovian Facies Series. Once again, the type locality of Buchan metamorphism is the Dalradian of Scotland.
The Buchan is characterised by the following metamorphic zones:
Biotite Zone (Greenschist Facies)
Cordierite Zone (Amphibolite Facies)
Andalusite Zone (Amphibolite Facies)
Sillimanite Zone (Amphibolite to Granulite Facies)
We will be spending 3 days looking in detail at these classic rocks, examining the classic low-P metamorphic zones and associated assemblages developed in metapelitic and calc-silicate rocks. We will see partially melted rocks (migmatites), meta-gabbros and associated contact metamorphic rocks, amphibolite-facies shear-zones, sedimentary structures and much else.
Perhaps the word’s best-exposed regional isograds occur within the coastal section around Banff.