Zircon U–Pb geochronology and Hf isotopic compositions of igneous rocks from Sumatra: implications for the Cenozoic magmatic evolution of the western Sunda Arc

Yu Ming Lai*, Ping Ping Liu, Sun Lin Chung, Azman A. Ghani, Hao Yang Lee, Long Xiang Quek, Shan Li, Muhammad Hatta Roselee, Sayed Murtadha, Lediyantje Lintjewas, Yoshiyuki Iizuka

*此作品的通信作者

研究成果: 書貢獻/報告類型篇章

2 引文 斯高帕斯(Scopus)

摘要

Sumatra is located at the western end of the Sunda Arc, which resulted from the subduction of the Indo-Australian Plate beneath the Eurasian Plate. In this study, we report detailed zircon U–Pb and Hf isotope data for Cenozoic igneous rocks from the entire island of Sumatra to better constrain the temporal and spatial distribution of arc magmatism. The new dataset, combined with literature information, identifies the following two magmatic stages: (1) Paleocene to Early Eocene (66–48 Ma) and (2) Early Miocene to Recent (23–0 Ma), with a 25 myr-long period of magmatic quiescence in between. The magmatic zircons show predominantly pos-itive and high εHf(t) values, ranging from +19.4 to +7.1 in western Sumatra, +17.1 to +1.6 in central Sumatra and +18.0 to +7.0 in eastern Sumatra, indicating an isotopically juvenile magma source in the mantle wedge along the western Sunda Arc. We explain the negative and low εHf(t) values (+0.5 to −13.1) of young samples around the supervolcano Toba as evidence for the subduction of sediment. We argue for a change in the sub-duction processes, where the first magmatic stage ceased owing to the termination of the Neo-Tethyan subduction and the following stage corresponded to the modern Sunda subduction.

原文英語
主出版物標題Geological Society Special Publication
發行者Geological Society of London
頁面455-478
頁數24
版本1
DOIs
出版狀態已發佈 - 2024 1月 15

出版系列

名字Geological Society Special Publication
號碼1
537
ISSN(列印)0305-8719

ASJC Scopus subject areas

  • 水科學與技術
  • 海洋工程
  • 地質學

指紋

深入研究「Zircon U–Pb geochronology and Hf isotopic compositions of igneous rocks from Sumatra: implications for the Cenozoic magmatic evolution of the western Sunda Arc」主題。共同形成了獨特的指紋。

引用此