• Title/Summary/Keyword: 화강암류

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SHRIMP U-Pb Age of the Early Jurassic Deformed Granites in the Aneui Quadrangle, SW Yeongnam Massif (영남육괴 남서부 안의도폭 지역 초기 쥬라기 변형 화강암류의 SHRIMP U-Pb 연대)

  • Seo, Jaehyeon;Song, Yong-Sun;Park, Kye-Hun
    • Economic and Environmental Geology
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    • v.49 no.2
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    • pp.147-153
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    • 2016

  • SHRIMP U-Pb age determination was carried out for deformed granites in the Aneui quadrangle, SW Yeongnam Massif. Dating of zircons from a highly deformed mylonitic granite with banded structure and a relatively less deformed 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 the Aneui area was interpreted as follows; Subduction-related granitic magmatism started with the intrusion of the Hamyang Granite in the middle Triassic (ca. 225-219 Ma) mainly in the west of the area and ended with syenitic intrusion at the end of Triassic period (ca, 220-210 Ma). After a relatively short period of quiescency, granitic magmatism restarted with the intrusion of magma forming deformed granites dated in this study at the Early Jurassic of ca. 195 Ma and continued to ca. 189 Ma and dioritic intrusion was associated around the late stage of granitic magmatism.

  • https://doi.org/10.9719/EEG.2016.49.2.147 인용 PDF KSCI