Radiocarbon dates for rock-glaciers around Mt. Mibudake, southern Japanese Alps

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  • Ikeda Atsushi
    Faculty of Life and Environmental Sciences, University of Tsukuba
  • Nishii Ryoko
    Ikawa Forest, Faculty of Life and Environmental Sciences, University of Tsukuba

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Other Title
  • 赤石山脈三峰岳周辺の岩石氷河の<SUP>14</SUP>C年代
  • 赤石山脈三峰岳周辺の岩石氷河の14C年代
  • アカイシ サンミャク ミツミネダケ シュウヘン ノ ガンセキ ヒョウガ ノ 14C ネンダイ

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Abstract

Two relict rock glaciers, which are indicators of a former permafrost environment, were 14Cdated around Mt. Mibudake, southern Japanese Alps, using accelerator mass spectrometry. Three samples for dating were collected from the boundary between the deposit of the north rock-glacier and the underlying bedrock. Two of those samples indicate 11cal ka BP, and the other one indicates 18cal ka BP. A sample dated 10cal ka BP was also taken from the steep frontal slope of the south rock-glacier which fills a cirque bottom. Considering the timing of the cirque formation and the mechanisms of rock-glacier advance, we conclude that the south rock-glacier developed in the Late Glacial, whereas the timing of the north rock-glacier advance was sometime from the Last Glacial Maximum to the early Holocene.

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