Magmatic pulses of the Tatun Volcano Group, northern Taiwan, revisited: Constraints from zircon U-Pb ages and Hf isotopes

Mei Fei Chu*, Yu Ming Lai, Qiuli Li, Wen Shan Chen, Sheng Rong Song, Hao Yang Lee, Te Hsien Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The initiation and duration of magmatism in the Tatun Volcano Group (TVG), likely resulting from extensional collapse of the northern Taiwan mountain belt, remains an important issue of debates in the Taiwan orogeny. Here we report a detailed study of U-Pb ages determined by SIMS and LA-ICPMS, together with Hf isotopic data, of zircon separates from a total of 22 extrusive rocks from the TVG lava flow and additional two andesites from Keelungyu (KLY), a volcanic islet off NE Taiwan. Magmatic zircons from the TVG are characterized by uniform and high Hf isotopic ratios, with εHf(T) mostly from +20 to +10. Their overall 206Pb/238U ages suggest that the TVG magmatism was initiated ∼3 Ma but more active ≤0.8 Ma with a flare up ≤0.35 Ma. Magmatic zircons from the two KLY samples reveal identical 206Pb/238U ages (0.41 Ma), coupled with Hf isotopes [εHf(T): +25 to +9] comparable to those of the TVG. Thus, KLY is proposed as part of the TVG. Consequently, we argue that the main body of the TVG formed ≤0.8 Ma by post-collisional volcanism, but the mechanism resulting in the magmatic episodes ≥1.0 Ma remains obscure due to the scarcity of rock exposures.

Original languageEnglish
Pages (from-to)209-217
Number of pages9
JournalJournal of Asian Earth Sciences
Volume167
DOIs
Publication statusPublished - 2018 Nov

Keywords

  • Hf isotope
  • Taiwan
  • Tatunvolcano
  • U-Pb geochronology
  • Zircon

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

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