| 苏门答腊外海13.5万年来的火山灰记录:来自深海沉积物岩心IR-GC1的证据 |
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| 作者姓名： | QIU Zhongyan HAN Xiqiu JIN Xianglong WANG Yejian ZHU Jihao |
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| 基金项目： | The National Natural Science Foundation of China under contract Nos 41106052 91228101 and 41306056; the Fundamental Research Funds for National Nonprofit Institute Grant under contract No. JG0910. |
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| 摘 要： | Three volcanic ash layers were identified in a deep-sea Core IR-GC1 from the north-eastern Indian Ocean, adjacent to western Indonesian arc. They were dominated by glass shards with minor mineral crystals, such as plagioclase, biotite, and hornblende. According to the morphology and major element compositions of the representative glass shards, combined with the δ18O-based age, it is suggested that ash Layer A is correlated to the youngest Toba tuff(YTT), Layer B is supposed to be associated with a new eruption of Toba caldera in an age of 98 to 100 ka. Ash Layer C is different the geochemistry characteristics than those of Layer A and Layer B, suggesting that Layer C was not originated from Toba but registered another volcanic eruption event.
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| 关 键 词： | 深海沉积物 火山碎屑 苏门答腊 证据 火山灰层 地球化学特征 玻璃碎片 北印度洋 |
| 收稿时间： | 2/7/2013 12:00:00 AM |
| 修稿时间： | 2013/9/13 0:00:00 |
Tephra records from abyssal sediments off western Sumatra in recent 135 ka: evidence from Core IR-GC1 |
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| QIU Zhongyan,HAN Xiqiu,JIN Xianglong,WANG Yejian,ZHU Jihao.Tephra records from abyssal sediments off western Sumatra in recent 135 ka: evidence from Core IR-GC1[J].Acta Oceanologica Sinica,2014,33(12):75-80. |
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| Authors: | QIU Zhongyan HAN Xiqiu JIN Xianglong WANG Yejian and ZHU Jihao |
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| Institution: | Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| Abstract: | Three volcanic ash layers were identified in a deep-sea Core IR-GC1 from the north-eastern Indian Ocean, adjacent to western Indonesian arc. They were dominated by glass shards with minor mineral crystals, such as plagioclase, biotite, and hornblende. According to the morphology and major element compositions of the representative glass shards, combined with the δ18O-based age, it is suggested that ash Layer A is correlated to the youngest Toba tuff (YTT), Layer B is supposed to be associated with a new eruption of Toba caldera in an age of 98 to 100 ka. Ash Layer C is different the geochemistry characteristics than those of Layer A and Layer B, suggesting that Layer C was not originated from Toba but registered another volcanic eruption event. |
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| Keywords: | geochemistry glass shards youngest Toba tuff abyssal sediment |
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