A review of the nature of magmatism in central Anatolia during the Mesozoic post-collisional period

Magmatism in central Anatolia is characterized by petrographically and chem ically distinct granitic and syenitic rocks. The granitic magmatism compris es C-type (crustal-derived) and H-type (hybrid) monzogranites and monzonite s. Garnet-bearing C-type leucogranites represent the oldest magmatic phase, but younger hornblende +/- biotite +/- K-feldspar H-type plutons dominate the geology of the Central Anatolian Crystalline Complex (CACC). These typi cally include mafic microgranular enclaves. The granitic magmatism predates syenitic intrusions, among which quartz-bearing syenites were emplaced pri or to feldspathoid-bearing ones. The nature of magmatism in central Anatolia varies through time from peralu minous to metaluminous to alkaline. These different magma types reflect dis tinct stages of post-collisional magmatism, in which interaction between cr ust and mantle varied considerably. The C-type granites of the early stages of post-collisional magmatism were likely derived by partial melting of th e lower continental crust induced by mafic magma underplating as a result o f lithospheric delamination. The H-type granites and syenites of the mature and advanced stages of post-collisional magmatism indicate a significant c ontribution from mantle-derived magma within a continuous or episodic exten sional tectonic regime.