Petrogenesis and mode of emplacement of a Neoarchean tonalite–trondhjemite–diorite suite: the Eau Jaune Complex, Abitibi greenstone belt

Magmatism during the maturation phase of Archean greenstone belts produced voluminous tonalite–trondhjemite–granodiorite (TTG) suites, as well a lesser amount tonalite–trondhjemite–diorite (TTD) suites. Such TTD suites have recently been recognized in Abitibi belt, on southern flank Superior Craton, Canada, but their source(s), differentiation processes, and depths emplacement remain poorly constrained. The Neoarchean Eau Jaune Complex lies northeastern corner belt represents one most tonalite-dominated diorite-bearing intrusive Chibougamau region. This suite comprises six phases with distinct petrology chemistry. All units were emplaced laccolith-like intrusions injected along discontinuities within volcanic succession at ca. 2724 Ma (U–Pb zircon dating), synvolcanic interval (i.e., construction phase), depth approximately 7–8 km. heavy rare-earth element (HREE)-depleted (granodiorite, tonalite, trondhjemite) correspond to magmas that fractionated amphibole likely by partial melting garnet- titanate-bearing amphibolite, akin TTG magmas. least HREE-depleted are dioritic composition mantle-derived may interacted melts. indicates interaction between coeval crustal melts belt. Models formulated address geodynamic evolution must account for production basalt-derived (TTG suites) (tholeiitic magmatism) occasionally interacting form