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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.
Additional recommended knowledge
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.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Trondhjemite". A list of authors is available in Wikipedia.|