Classification Of Granite

Initially by H H. Read put forward the famous saying "There are all kinds of granites" in 1933. In fact, there are at least 20 granite classification schemes put forward (see Barbarin's summary in 1990 and 1999; and Frost et al.'s comments on commonly used classification methods in 2001). The most common classification scheme is geochemical and/or genetic letter classification scheme, for example, granite is divided into S-type, I-type, M-type, A-type and C-type (S-type refers to granite transformed from sedimentary rock; I-type refers to magma origin; M-type refers to mantle origin; A-type refers to anhydrous granite; C-type refers to perilla granite); Or it can be divided into calc alkaline, alkaline, peralkaline, peraluminous and aluminous granite, etc; Or it can be divided into "orogenic" granites (oceanic and continental volcanic arcs; continental collision zones), "post orogenic" granites (post orogenic uplift or subsidence areas), and non "orogenic" granites (continental rifts, hotspots, mid ocean ridges, oceanic islands) according to the tectonic setting