Barrow's metamorphic zones
Zonas metamórficas de Barrow
- Date
- 1893 · confidence high
- Place
- Glen Clova, Angus, Scotland, United Kingdom
- Credited to
- George Barrow
- Field
- Cosmos & Earth
What was discovered
Mapping the southeastern Highlands of Scotland, Barrow defined successive zones marked by index minerals (chlorite, biotite, garnet, staurolite, kyanite and sillimanite), indicating increasing metamorphic grade. His method makes it possible to read pressure and temperature in rocks.
Barrow published his work in 1893; the term isograd is Tilley's (1925) and metamorphic facies are Eskola's (1920). The coordinates are those of Glen Clova, one of the study areas.
What it led to
- isograds and metamorphic facies
- the basis of modern metamorphic petrology