The metamorphic grade or degree of metamorphism increases towards the south or southeast.
2.
Minerals that are characteristic for a certain metamorphic grade are called index minerals.
3.
Changes in mineralogical composition in a terrane reflect differences in metamorphic grade of the rocks.
4.
The metamorphic grade of an aureole is measured by the peak metamorphic mineral which forms in the aureole.
5.
At higher metamorphic grades, anthophyllite, enstatite, olivine and diopside dominate as the rock mass dehydrates.
6.
The metamorphic grade is considered to be peak granulite facies, but the majority has preserved peak amphibolite facies assemblages.
7.
Where a rock has been subject to differential stress, the type of foliation that develops depends on the metamorphic grade.
8.
Subduction occurred between the Oligocene and the Miocene, and the metamorphic grade represents the southernmost extent of the Cycladic blueschist belt.
9.
The belt has a lower metamorphic grade than the Omineca Belt and ranges from 400 million to within 10, 000 years old.
10.
The ages are from 600 million years to recent, with metamorphic grades depending on the age and host of the rock type.
