The nature and origin of granite magmatism has a long and controversial history. Despite the obvious significance of granitic rocks in terms of planetary differentiation and crustal evolution, there is still no absolute consensus on how these magmas form, ascend and are emplaced, despite more than two centuries of investigation. A plethora of ideas on their genesis have been advanced, with differences of opinion flaring up into surprisingly intense controversies, to the extent that by the middle part of the last century the whole concept of granite magmatism became to be perceived as a ‘problem’. Granites are not theoretical constructs...
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