3 - Phanerozoic Granites

Abstract

Granites prevail in the peninsula throughout the Phanerozoic Era. The Permian–Triassic granitic rocks (tonalities, trondhjemites, granodiorites, and monzonites) largely occur in scattered areas in the middle part of the Yeongnam Massif, emplaced under an arc-related setting. The Jurassic granitic rocks occur in an extensive area of the Gyeonggi, Gangwon, Chungcheong, and Jeolla provinces. They comprise batholiths, several tens of kilometers wide belts, and consist of medium- to coarse-grained granite, granodiorite, and tonalite. These rocks formed during the orthogonal subduction of the Pacific Plate under the Asian continent. The Cretaceous–Tertiary granites are generally fine- to medium-grained and form stocks. They are associated with volcanic rocks, which are representative of arc magmatism during the oblique subduction of the Pacific Plate.