Definition of ttg
An abbreviation for Tonalite, Trondhjemite, and Granodiorite. Found in granitic complexes and batholiths and compose most of the preserved Archean crust on Earth. They contain large infolded remnants of supercrustal rocks as well as numerous inclusions of surrounding greenstone belts.
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New Locality Added: Aldeia de Santa Margarida, Idanha-a-Nova, Castelo Branco District, PortugalFrom Rui Nunes, 27th Aug 2014 15:07:10