Age of volcanic fan around the western part of Rishiri volcano, northern Hokkaido, Japan, using OSL dating

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  • Kondo Reisuke
    College of Humanities and Sciences, Nihon University Japan.
  • Tsukamoto Sumiko
    Leibniz Institute for Applied Geophysics, Geochronology and Isotope Hydrology

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  • 北海道北部，利尻火山西部におけるOSL年代測定による古期火山麓扇状地の形成年代
  • ホッカイドウ ホクブ リシリ カザン セイブ ニ オケル OSL ネンダイ ソクテイ ニ ヨル コキ カザンロク センジョウチ ノ ケイセイ ネンダイ

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Abstract

The Rishiri volcano is located on Rishiri Island, northern Hokkaido. The surface of the volcano is largely covered by volcanic fans, which can be divided into young and old stages based on topographic features. The young-stage volcanic fans are known to be of recent morphology ; however, the age of the old-stage fans is still unknown.<BR>The aim of this study is to apply the optically stimulated luminescence (OSL) dating method to the volcanic fan sediments of the old stage in the western part of Rishiri volcano. The samples for the OSL dating were collected from three sites ; fine-grain quartz was extracted from the samples and was used for the OSL measurements.<BR>OSL dating was applied successfully to the volcanic fan sediments, because the upper unit of the fan sediments contains several layers of loess. The results indicate that the lower unit of the volcanic fan was deposited rapidly after the eruption of Kutsugata lava flow (<31 ka) and before 22 ka. The upper unit was deposited intermittently from the Last Glacial Maximum to the early Holocene under the influence of periglacial processes.

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