Distribution of Shattered Clasts at a Nivation Hollow in Mt. Koizumidake, the Daisetsu Mountains

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  • 大雪山小泉岳北東の残雪凹地における破砕礫の分布
  • ダイセツザン コイズミダケ ホクトウ ノ ザンセツ オウチ ニ オケル ハサイレキ ノ ブンプ

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Abstract

The distribution of shattered clasts, which indicates the magnitude of physical weathering, was investigated at a nivation hollow (142° 56'E, 43° 40'N, 2, 100 m a.s.l.) in the Daisetsu Mountains, central Hokkaido. The 25 largest boulders or cobbles in 121 quadrats (1×1m) were categorized into shattered or intact clasts. Much larger percentages of shattered clasts were found within the nivation hollow than on the wind-swept rubble slopes, which implies that the snowpatch enhance physical weathering. The largest percentage of shattered clasts occurred where snow disappears between mid-August and September. The rock moisture contents are considered to be highest around the snowpatch margin and in meltwater streams. If the snowpack remains until the frequent freeze-thaw period in autumn, both abundant moisture supplies and freezing temperatures would activate frost weathering around the snowpatch margin. The distribution of shattered clasts reflects the moisture and temperature conditions favorable for frost shattering.

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