Abstract
Department of Earth Environmental Sciences, Pukyong National University, Busan 48513, Korea(Received: 18 March 2016 / Revised: 7 April 2016 / Accepted: 8 April 2016)SHRIMP U-Pb age determination was carried out for deformed granites in the Aneui quadrangle, SW YeongnamMassif. Dating of zircons from a highly deformed mylonitic granite with banded structure and a relatively lessdeformed porphyritic to augenic granites, that were known as Precambrian gneisses, yielded the same age of ca.195 Ma. On the basis of this result and previous age data, Early to Middle Mesozoic igneous activity around theAneui area was interpreted as follows; Subduction-related granitic magmatism started with the intrusion of theHamyang Granite in the middle Triassic (ca. 225−219 Ma) mainly in the west of the area and ended with syeniticintrusion at the end of Triassic period (ca, 220−210 Ma). After a relatively short period of quiescency, graniticmagmatism restarted with the intrusion of magma forming deformed granites dated in this study at the Early Juras-sic of ca. 195 Ma and continued to ca. 189 Ma and dioritic intrusion was associated around the late stage of gra-nitic magmatism.
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