migmatite
Sign in to savethumb|Ptygmatic folding in migmatite on Naissaar Island, Estonia thumb|Migmatite on the coast of Saaremaa, Estonia thumb|Intricately-folded migmatite from near Geirangerfjord, Norway
Wikidata facts
- Subclass of
- metamorphic rock
- Image
- Migmatite 2005.jpg
Show 2 more facts
- Commons category
- Migmatite
- named by
- Jakob Sederholm
Sources (2)
via Wikidata · CC0
~16 min read
Encyclopedic overview
12 sectionsContents
- The diagenesis - metamorphism sequence
- Partial melting, anatexis and the role of water
- Color-banded migmatites
- Migmatite textures
- Early history of migmatite investigations
- Agmatite
- Migmatite melts provide buoyancy for sedimentary isostasy
- Other migmatite hypotheses
- Etymology
- See also
- References
- External links
thumb|Ptygmatic folding in migmatite on Naissaar Island, Estonia thumb|Migmatite on the coast of Saaremaa, Estonia thumb|Intricately-folded migmatite from near Geirangerfjord, Norway
Migmatite is a composite rock found in medium and high-grade metamorphic environments, commonly within Precambrian cratonic blocks. It consists of two or more constituents often layered repetitively: one layer is an older metamorphic rock that was reconstituted subsequently by partial melting ("paleosome"), while the alternate layer has a pegmatitic, aplitic, granitic or generally plutonic appearance ("neosome"). Commonly, migmatites occur below deformed metamorphic rocks that represent the base of eroded mountain chains.
Excerpted from Wikipedia’s “migmatite” article, available under the CC BY-SA 4.0 licence.