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Granite transformed from sedimentary rock

Edit:Xiamen Youstar Imp & Exp Co.,LtdUpDate:Jun 07, 2018

Originally by H. H. Read quoted in 1933, “There is a variety of granites”, in fact, there are at least 20 proposed granite classification schemes (see Barbarin, 1990, 1999 summary; and Frost et al. 2001 for the more commonly used Classification method made comments). The most common classification scheme is geochemistry and/or gene letter classification schemes. For example, granite is divided into S type, I type, M type, A type, and C type (S type is granite transformed from sedimentary rock; I The type is magma origin; M type is the source of mantle; A type is anhydrous granite; C is perilla granite; or is classified as calc-alkaline, alkaline, over-alkaline, peraluminous, and aluminous granite; or according to structure Background is divided into "orogenic" granites (oceanic and continental volcanic arcs; continental collisional belts), "post-orogenic" granites (uplifts or subsidences after orogenic periods), and non-"orogenic" granites (continental rifts, hotspots, oceans, etc.) Ridges, Ocean Island, etc.

As the continent's landmark rock, granite forms the basis of the continental upper crust, and the formation process of granite is usually closely related to the tectonic, metamorphic and metallogenic processes of the continent. From the 18th century when geology was still in the cradle stage, the issue of granite genesis was the subject of many controversies. The debate on the genesis of granite can be found in the works of Gilluly (1948), Pitcher (1993), and Young (2003). What needs to be mentioned is that since the theory of plate tectonics was introduced in the 1960s, many explanations concerning the genesis of granite have been re-understood in the theoretical framework of the plate. In many cases, the understanding seems to be consistent, but the actual controversy continues.