Mesozoic juvenile crustal formation in the easternmost tethys: Zircon Hf isotopic evidence from Sumatran granitoids, Indonesia

Shan Li*, Sun Lin Chung*, Yu Ming Lai, Azman A. Ghani, Hao Yang Lee, Sayed Murtadha

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

18 引文 斯高帕斯(Scopus)

摘要

Prior to the collision of India with Asia, the evolution of island arcs and resultant crustal formation in the now-disrupted easternmost Tethys are poorly constrained. Here, we report for the first time zircon U-Pb and Hf isotopic data from Mesozoic granitoids in Sumatra, Indonesia. Our analyses identified three magmatic episodes at 214-201 Ma, 148-143 Ma, and 102-84 Ma, respectively, with a drastic change in magmatic zircon εHf(t) values from -13.1 to +17.7 in the Late Triassic granitoids, which reveals a fundamental restructuring of the arc system in Sumatra. Subsequently, all Jurassic to Late Cretaceous granitoids have exclusively positive zircon εHf(t) values (+17.7 to +10.2), consistent with juvenile arc development owing to subduction of the easternmost Tethyan lithosphere beneath Sumatra. Such highly positive zircon εHf(t) values of the Sumatran granitoids, in general accordance with those of the Gangdese arc system in South Asia, are markedly higher than those (+13.7 to -14.7) of broadly contemporaneous Cordilleran arcs in Americas and Zealandia. Our findings from the easternmost Tethys provide new insights into not only the tectono-magmatic evolution of eastern Tethys, but also its crucial role in global juvenile crustal growth.

原文英語
頁(從 - 到)1002-1005
頁數4
期刊Geology
48
發行號10
DOIs
出版狀態已發佈 - 2020 10月 1

ASJC Scopus subject areas

  • 地質學

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