Chronometry of Glacial Deposits by the 10Be Exposure Dating Method. A Case Study in the Senjojiki and Nogaike Cirques, Northern Kiso Mountain Range, Central Japan.

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  • Aoki Tatsuto
    Department of Earth and Planetary Science, University of Tokyo

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  • ｀１０´Ｂｅ露出年代法を用いた氷成堆積物の形成年代の測定　　木曽山脈北部，千畳敷カール・濃ケ池カールの事例
  • 10Be ロシュツ ネンダイホウ オ モチイタ ヒョウセイタイセキブツ ノ ケイセイ ネンダイ ノ ソクテイ キソ サンミャク ホクブ センジョウジキ カール ノウガイケ カール ノ ジレイ
  • A Case Study in the Senjojiki and Nogaike Cirques, Northern Kiso Mountain Range, Central Japan
  • 木曽山脈北部,千畳敷カール・濃ヶ池カールの事例

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The author has measured the numerical age of glacial deposits composing the terminal moraines at the bottom of the Senjojiki and Nogaike cirques, in the northern part of the Kiso mountain range, central Japan, by the bellium-10 (10Be) exposure dating method. 10Be is one of the in situ cosmogenic radionuclides (in situ CRNs) yielded by the bombardment of the morainic gravel with a cosmic ray, and 10Be concentration of the collected gravels shows the period of the bombardment. Many morainic boulders from each moraine have shown the contiguous values of the exposure age (17-25ka), and this age is correlated with the last glacial maximum stage. It is concluded that these moraines were formed during the last glacial maximum. Since the measured ages are in close proximity to each other, the 10Be exposure age method is expected to apply well to the age determination of morainic deposits.

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