Zircon U-Pb and Hf isotopic constraints on the magmatic evolution of the Northern Luzon Arc

Yu Ming Lai*, Mei Fei Chu, Wen Shan Chen, Wen Yu Shao, Hao Yang Lee, Sun Lin Chung

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

4 引文 斯高帕斯(Scopus)

摘要

The complete volcanic sequences restored in the Coastal Range of Taiwan are key archives for better understanding the magmatic and tectonic evolution of the Northern Luzon Arc. This paper reports (1) new zircon U-Pb ages and Hf isotopic data of fourteen volcanic samples from different sequences of four major volcanoes in the Coastal Range, (2) Hf isotopic data of dated magmatic and detrital zircons from two offshore volcanic islands, Lutao and Lanyu. These data indicate that the arc magmatism in the Coastal Range started at ∼15 Ma, most active at ∼9 Ma, and ceased at ∼4.2 Ma. Magmatic zircons from the arc rocks show a significant variation in Hf isotopic composition, with ϵHf(T) values varying from +24.9 to +4.8. As pointed out by our previous studies, old continental zircons that show Cathaysian-type ages and Hf isotope features are common in samples from the Yuemei, Chimei, and Lanyu volcanoes, supporting the notion for the influence of the existence of an accreted micro-continent or continental fragment plays a role in the petrogenesis. Such inherited zircons are not observed in the Chengkuang'ao and Tuluanshan volcanoes and uncommon in Lutao, implying the discontinuity or a limited extent of the accreted continental fragment. The ϵHf(T) values are high and positive from ∼15 - 8 Ma (+25 to +15; ±5ϵ-unit variation), and became lower from ∼6 to 4.2 Ma (+20 to +8; ±6ϵ units) and the lowest from ∼1.3 Ma (+19 to +5; ±7ϵ units). Such a temporal variation in zircon Hf isotopic ratios can be also identified in whole-rock Hf and Nd isotopic compositions, which decrease from ∼6 Ma when the Northern Luzon Arc may have started colliding with the Eurasian continental margin.

原文英語
頁(從 - 到)149-186
頁數38
期刊Terrestrial, Atmospheric and Oceanic Sciences
29
發行號2
DOIs
出版狀態已發佈 - 2018 4月

ASJC Scopus subject areas

  • 海洋學
  • 大氣科學
  • 地球與行星科學(雜項)

指紋

深入研究「Zircon U-Pb and Hf isotopic constraints on the magmatic evolution of the Northern Luzon Arc」主題。共同形成了獨特的指紋。

引用此