Japan-US joint research on eruptive history and Aleut archaeological sites using radiocarbon and tephra chronologies

阿拉斯加阿留申群岛的阿达克岛覆盖着全新世的土壤火山灰复合体序列。火山灰层对建立岛上的年代框架很有用。布莱克（1976年）描述了三个明显的火山灰矿床（主火山灰矿床、中间火山灰矿床和三明治火山灰矿床）。本研究对黑文湖附近的泥炭沉积物进行了取芯，以重新评估年代框架。本研究利用加速器质谱法（AMS）获得了岩相学和放射性碳年代。主火山、中间火山、三明治火山、YBO火山和四十年火山喷发的年代分别约为9.5、7.2、4.7、3.6和0.4 cal kBP。

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). This study conducted coring peat deposits near Haven Lake, in order to re-evaluate the chronological framework. This study obtained 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.