Editing Granitoid (section)

== Generalizations ==
[[File:Continental-continental convergence en.svg|thumb|Illustration of continental collision as a result of convergence]]
There are several generalizations that apply to the majority of granitoids. Typically, granitoids occur where [[orogeny]] thickens [[continental crust]] either by [[subduction]] yielding a [[continental arc]] or by [[Tectonic Plate|convergence]] yielding continental collisions.<ref name="Winter-2014">{{cite book | last=Winter | first=John D. | title=Principles of igneous and metamorphic petrology | publication-place=Harlow | date=2014 | isbn=978-1-292-02153-9 | oclc=890442947 | page = 402}}.</ref> Generally, the evolution to granitoid [[magma]]s requires a thermal disturbance to ascent though continental crust.<ref name="Winter-2014" />&nbsp; Most granitoids are generated from [[Magma differentiation|crustal anatexis]], the partial melting of the crust;&nbsp; however the mantle may contribute both heat and material.<ref name="Winter-2014" />&nbsp; Granitoids can occur coeval with [[volcanic rock]]s that have equivalent chemical composition (granite–[[rhyolite]], syenite–[[trachyte]], [[granodiorite]]–[[dacite]] etc.) however, these extrusive rocks are often [[Erosion|eroded]] so just the [[plutonic rock]]s outcrop.<ref name="Winter-2014" />&nbsp; Granitoids can form in all tectonic environments.<ref name="Winter-2014" />

There are numerous exceptions to these generalizations.<ref name="Clarke-1992">Clarke, D. B. (1992) Granitoid Rocks, Chapman&nbsp; & Hall, London.</ref><ref name="Winter-2014" />&nbsp; For example, granitoids can form in [[Anorogenic magmatism|anorogenic&nbsp;environments]], a granitoid source rock can be from the mantle (for example, at intraplate [[Hotspot (geology)|hotspot]]s) and the melting mechanism can be [[Radiogenic nuclide#Radiogenic heating|radiogenic crustal heat]].<ref name="Clarke-1992" /><ref>Pitcher, W. S. 1982. Granite type and tectonic environment. ''In'' Hsu, K. J. (ed.) ''Mountain Building Processes'', 19–40. London: Academic Press.</ref><ref>{{cite journal | last=Barbarin | first=Bernard | title=Granitoids: Main petrogenetic classifications in relation to origin and tectonic setting | journal=Geological Journal | publisher=Wiley | volume=25 | issue=3–4 | year=1990 | issn=0072-1050 | doi=10.1002/gj.3350250306 | pages=227–238| doi-access=free | bibcode=1990GeolJ..25..227B }}</ref>