Regional metamorphism involves the alteration of mineral assemblages in rocks as temperature and pressure increase with burial deeper in the Earth.
This phase of deformation occurred contemporaneously with the
regional metamorphism in the SSMZ.
Growth, behavior, and textural sector zoning of biotite porphyroblasts during
regional metamorphism and the implications for interpretation of inclusion trails: Insights from the Pequop Mountains and Wood Hills, Nevada, U.S.A.
All strata in the study area experienced chlorite and subchlorite grade
regional metamorphism, with more intense recrystallization only in contact aureoles surrounding granitic and mafic plutons.
The host rock of this type of beryl occurrence is similar to beryl (emerald) deposits that are formed via syn- to post-tectonic reactions under low-grade
regional metamorphism and within biotite schist tectonically overlain by ophiolite, such as in southern Egypt (Abdalla and Mohamed, 1999) and Habachtal, Austria, (Grundmann and Morteani, 1989) where the source of chromium is believed to be metasomatized ophiolitic rocks (Groat et al., 2008).
Numerous occurrences of different types (Sn-W, P, Pb-Zn, Pb-Zn-Cu, Pb-Ag, Sb, Au) have originated as a result of intensive collisional magmatic activity and
regional metamorphism during Variscan orogeny (Gumiel and Arribas, 1990).
The overprinting of biotite by fibrolitic sillimanite mostly resulted from the breakdown of biotite during
regional metamorphism followed by higher grade of thermal metamorphism.
Jamieson, R.A., Beaumont, C., Fullsack, P., and Lee, B., 1998, Barrovian
regional metamorphism: Where's the heat, in Treloar, P.J., and O'Brien, P.J., eds., What Drives Metamorphism and Metamorphic Reactions: Geological Society of London Special Publication 138, p.
Age of late Svecofennian
regional metamorphism in southern Finland and south-central Sweden.