The famous saying "There are all kinds of granites" originally proposed by HH Read in 1933. In fact, there are at least 20 types of granite classification schemes proposed (see Barbarin, 1990, 1999); and Frost et al., 2001 Comments on more commonly used classification methods).
The most common classification scheme is the geochemical and/or genetic letter classification scheme. For example, granites are divided into S-type, I-type, M-type, A-type and C-type (S-type is granite transformed from sedimentary rock; I) Type M is of magma origin; Type M is mantle origin; Type A is anhydrous granite; C represents perilla granite); or it can be divided into calc-alkaline, alkaline, over-alkaline, peraluminous and aluminous granites; or according to the structure The background is divided into "orogenic" granites (oceanic and continental volcanic arcs; continental collision zones), "post-orogenic" granites (uplift or collapse area after the orogenic period), and non-"orogenic" granites (continental rifts, hotspots, mid-ocean Ridge, Ocean Island) etc.
