Table 3 Sources of material and heat, and processes of peraluminous arc magmatism in subduction–accretion complexes

Material sources

Pelites, greywackes

Large amounts of (strongly) peraluminous S-type melts are generated in a temperature range between 850 and 875 °C (Vielzeuf and Holloway 1988)

Basaltic rocks

Hbl bearing tonalites (high-temperature I-types, Chappell et al. 2004) and banded amphibolites indicate basaltic source rocks

Magmatic processes

Hornblende fractionation

Crystallization of hornblende is a major fractionation process in CAFEM series (Debon and Le Fort 1988)

Dehydration melting

Muscovite dehydration melting can produce leucosomes of metatexites and pegmatites, thus, biotite dehydration is necessary to produce diatexites allowing for diapirism (Vielzeuf and Holloway 1988)

Mixing of compatible magmas

Felsic magmas (B < 170) with similar viscosities at similar temperatures of c. 850 °C are compatible and can mix

Heat transfer between incompatible magmas

Mantle-derived mafic magmas begin to solidify at 900 °C. Due to viscosity contrast they cannot mix with anatectical melts (Barker et al. 1992)

Heat source

Mantle

Hot mantle and/or large amounts of mantle-derived basaltic magmas are necessary to transport advective heat in order to release it across the Moho (Aranovich et al. 2014)