Phanerozoic Plutonism in the Peruvian Andes
A synthesis is presented of the geological settings of the several granite types of the Peruvian Andes, viz. intraplate reactivation, interplate collision, intraplate rifting, marginal ensialic spreading and plate-edge thickening. A Lower Palaeozoic, gneiss-granite series is located within an Arequipa crustal block; a syntectonic S-type granite series occurs within an Upper Palaeozoic flyschoid slate-belt; a group of high-K, relatively low-Ca, I-type granites is associated with a Permo-Triassic rift-zone and its molasse; a low-K, high-Ca, I-type granodiorite batholith formed the core of a marginal arc during the Cretaceous, and a belt of crust-contaminated, I-type granodioritic stocks is associated with the Tertiary volcanism. The possible sources of each type are discussed.
KeywordsVolcanic Rock Marginal Basin Dyke Swarm Breccia Pipe Eastern Cordillera
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