Genesis of the two main types of peraluminous granitoids

摘要: Two-mica monzogranites to leucogranites and biotite-rich, cordierite-bearing tonalites form two distinct groups of peraluminous granitoids. They can be distinguished by mineral rock associations the variation their peraluminosity during differentiation. Except for rare muscovite-bearing granitoids produced extreme fractionation or local contamination metaluminous magmas, majority are partial melting crustal rocks. Production either granites does not depend only on nature sources, but is also controlled physical parameters consequently way anatexis a thickened crust enhanced. Biotite-rich, generated where mantle-derived magmas injected into have underplated rocks; two-mica affected major shears thrusts. Correlations between differentiation indicate dominant role restite unmixing fractional crystallization in production evolution various types