Trondhjemite
Classification：Igneous Rock
Tonalite light colored varieties, mainly composed of sodic plagioclase, quartz and mica.
Trondhjemite (oligoclase granite, trondhjemite, trondjemite). Tonalite light colored varieties, mainly composed of sodic plagioclase, quartz and a small amount of biotite. The rock is characterized by no ortho feldspar, and only a small amount of common amphibole appears. Now as QAPF graphic synonyms in the 5 zone plagioclase granite and tonalite in the light. The noun is derived from the Trondhjem of Norway.
The -Trondhjemite- granodiorite of the inyun diorite, referred to as TTG, is often produced by a rock sleeve, which is also 22 or separate. They are an important part of the Archean craton. Up to now, the cause of the TTG is still unsettled.
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