アラスカ,アリューシャン列島のアダック島でのテフロクロノロジー

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タイトル別名
  • Tephrochronology in Adak Island, Aleutian Islands, Alaska

説明

Adak Island, Aleutian Islands, Alaska is covered with Holocene sequences of soil-tephra complexes. Tephra layers are useful for establishing a chronographic framework on the island. Black (1976) described the three conspicuous tephra deposits (Main, Intermediate and Sandwich). We conducted coring peat deposits near Haven Lake, in order to re-evaluate chronological framework. This paper presents petrography and radiocarbon date using accelerator mass spectrometry (AMS). Eruptions of the Main, Intermediate, Sandwich, YBO and Forty Year tephra were dated to approximately 9.5, 7.2, 4.7, 3.6 and 0.4 cal kBP, respectively.

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