Low-grade regional metamorphic rocks. Examples from Cornwall that show the first tectonic and metamorphic fabrics in metasediments, plus a variety of sedimentary and igneous rock types in outcrop and hand specimen.
18 images
Medium-grade regional metamorphic rocks including the Barrovian index minerals in metapelites and amphibolite-facies calcareous sediments and meta-igneous rocks from collisional metamorphic belts.
45 images
High-grade regional metamorphic rocks, including migmatites and granulites from both Phanerozoic orogenic belts and Precambrian metamorphic terrains.
32 images
High-pressure metamorphic rocks from subduction-zone environments, belonging to the blueschist and eclogite facies.
22 images
Dynamic metamorphism: rocks from environments such as large-scale ductile shear zones, where intense deformation is the dominant feature.
6 images
Thermal metamorphism. Rocks formed in environments where directed stresses are not important, such as the contact aureoles around igneous bodies. Assemblages usually formed at low pressure.
11 images
Rocks formed by a variety of processes that involve fluids, transfer of material in fluid, or crystallisation from silicate-bearing fluid or fluid-rich melt.
7 images
Ultrabasic metamorphic rocks that derive from the Earth's mantle, found in ophiolite sequences, orogenic peridotites, or as nodules in volcanic pipes.
6 images