Tephra layers in the Dome Fuji (Antarctica) deep ice core
Tephra layers in the Dome Fuji (Antarctica) deep ice core
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富士圆顶（南极洲）深冰芯中的火山灰层
DOI：
10.3189/172756499781821003
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发表时间：
1999
影响因子：
2.9
通讯作者：
T. Suzuki
中科院分区：
文献类型：
--
作者：
Y. Fujii;M. Kohno;H. Motoyama;S. Matoba;O. Watanabe;S. Fujita;N. Azuma;T. Kikuchi;T. Fukuoka;T. Suzuki
摘要南极洲富士冰穹冰芯在过去340 ka的时间里，在2503 m深的冰芯中发现了25层火山灰层。火山灰层的厚度在1-24 mm之间。沉积时的厚度和持续时间由简单的冰流模型确定，这表明，一次猛烈的火山爆发导致火山灰落在南极冰盖上长达5年之久，117 ka BE时100 mm厚的火山碎屑层573和2202 m深处的两个火山碎屑层可能起源于南大洋南桑威奇群岛的火山，考虑到火山碎屑的大小，直径>20μm，主要化学成分。在南极洲的沃斯托克冰芯中，25层火山灰层中只有8层可以被识别出来，但如果我们认为多云带是火山的话，它们都与沃斯托克火山灰层相对应。
Abstract A deep ice core drilled to 2503 m depth at Dome Fuji, Antarctica, contains 25 visible tephra layers during the past 340 ka. The thickness of tephra layers is in the range 1-24 mm. The thickness and duration at deposition, determined by a simple ice-flow model, suggests that a violent volcanic eruption caused ash to fall onto the Antarctic ice sheet for ~5 years and to form a ~100 mm thick tephra layer at 117 ka BE Two tephra layers at depths of 573 and 2202 m probably originated from volcanoes in the South Sandwich Islands, Southern Ocean, given the size of tephra shards, >20μm in diameter, and their major chemical composition. Only eight of the 25 tephra layers can also be recognized in the Vostok (Antarctica) ice core, but all correspond to the Vostok tephras if we consider cloudy bands to be volcanic.