Gabbroic enclave in intermediate ignimbrites: The youngest eruptive event in the northern Luzon Arc-Taiwan region

Yu Ming Lai*, Yu Yun Cho, Hao Yang Lee, Dung Han Lee, Yoshiyuki Iizuka, Long Xiang Quek

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

摘要

The white ignimbrite layer on top of volcanic sequences in the Coastal Range is the youngest eruption of the northern Luzon Arc in the Taiwan region. A gabbroic enclave was coexisting with the andesitic ignimbrite in this sequence. This study reports the dating results, textural and petrographic descriptions, and geochemical characteristics of the gabbroic enclave and andesitic breccias in the ignimbrite. Both components erupted approximately at 4 Ma, and show enrichment in large ion lithophile elements and depletion in high field strength elements, which are important island arc characteristics. Major and trace elements indicated that the andesitic magma shows larger fractionation and lower degrees of partial melting than the basaltic magma which formed the gabbroic enclaves. We suggest that three sub-stages of magmatism occur during the youngest eruption of the northern Luzon Arc at -4 Ma. In the first sub-stage, the basaltic magma generated by higher degrees of partial melting from the source rose to a shallow reservoir and cooled to build up the gabbroic wall rocks. Later, lower degrees of partial melting magma were injected into the shallow reservoir and fractionated to intermediate magma causing the second sub-stage. The third sub-stage was activated by the recharged magma, which triggered the intermediate magma to rise along the earlier pathway and assimilated within the gabbroic wall rock. This magma eventually erupted to form the andesitic ignimbrite with gabbroic enclaves within.

原文英語
頁(從 - 到)459-481
頁數23
期刊Terrestrial, Atmospheric and Oceanic Sciences
32
發行號4
DOIs
出版狀態已發佈 - 2021 8月

ASJC Scopus subject areas

  • 海洋學
  • 大氣科學
  • 地球與行星科學(雜項)

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