Trondhjemite
From Wikipedia, the free encyclopedia
Trondhjemite is a leucocratic (light-colored) intrusive igneous rock. It is a tonalite variety with high albite and low anorthite and orthoclase content. Trondhjemites are sometimes known as plagiogranites.
Trondhjemite is common in Archean terranes occurring in conjunction with tonalite and granodiorite as the TTG (tonalite-trondhjemite-granodiorite) orto-gneiss suite. Trondhjemite dikes also commonly form part of the sheeted dike complex of an ophiolite.
[edit] References
- Best, Myron G. (2002) Igneous and Metamorphic Petrology, Blackwell Publishing, 2nd ed. ISBN 1-4051-0588-7
