Stratigraphy and AMS Radiocarbon Dates of Cored Sediments (IrBH-2) from the Irosin Caldera, the Philippines

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  • T. MIRABUENO Ma. Hannah
    Philippine Institute of Volcanology and Seismology (PHIVOLCS)
  • TORII Masayuki
    The Implementation Research and Education System Center for Reducing Disaster Risk, Graduate School of Science and Technology, Kumamoto University
  • LAGUERTA Eduardo P.
    Philippine Institute of Volcanology and Seismology (PHIVOLCS)
  • DELOS REYES Perla J.
    Philippine Institute of Volcanology and Seismology (PHIVOLCS)
  • FUJIKI Toshiyuki
    AIG Collaborative Research Institute for International Study on Eruptive History and Informatics (ACRIFIS-EHAI), Fukuoka University
  • BARISO Ericson B.
    Philippine Institute of Volcanology and Seismology (PHIVOLCS)
  • OKUNO Mitsuru
    AIG Collaborative Research Institute for International Study on Eruptive History and Informatics (ACRIFIS-EHAI), Fukuoka University Department of Earth System Science, Faculty of Science, Fukuoka University
  • NAKAMURA Toshio
    Center for Chronological Research, Nagoya University
  • DANHARA Tohru
    Kyoto Fission-Track Co. Ltd.
  • SAITO-KOKUBU Yoko
    Tono Geosience Center, Japan Atomic Energy Agency
  • KOBAYASHI Tetsuo
    Graduate School of Science and Engineering (Science Course), Kagoshima University

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Other Title
  • イロシンカルデラ内から採取されたコア試料（IrBH-2）の層序とAMS放射性炭素年代

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Abstract

 Core drilling at Site IrBH-2 within the Irosin caldera in Sorsogon Province, southern Luzon reached a depth of 50 m. Systematic logging and documentation were carried out to describe and interpret the sediments. The accelerator mass spectrometer (AMS) radiocarbon dates obtained from plant fragments at 7.02-10.40-m depth were 1000 to 1800 BP. Lahars and fluvial deposits were the predominant deposits in the core sequence. The upper 12 m consisted mostly of andesitic fluvial and minor lahar deposits. These deposits may be correlated with the reworking of eruptive products from resurgent andesitic volcanism. One pyroclastic flow and 12 fallout deposits, including five possible fallout deposits, were intercalated with reworked sediments at depths of 12-50 m. The refractive index of representative samples indicated that post-caldera eruptions involved mainly andesite to dacite, with minor rhyolite magmas. The rhyolite fallout in the core had similar petrographic characteristics to the 41 cal kBP Irosin ignimbrite, suggesting that the fallout and the ignimbrite were sourced from the same magma.

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