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Tephra records from abyssal sediments off western Sumatra in recent 135 ka: evidence from Core IR-GC1 被引量:1

Tephra records from abyssal sediments off western Sumatra in recent 135 ka: evidence from Core IR-GC1
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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 theδ18O-based age, it is suggested that ash Layer A is cor-related 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 erup-tion event. 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 theδ18O-based age, it is suggested that ash Layer A is cor-related 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 erup-tion event.
出处 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2014年第12期75-80,共6页 海洋学报(英文版)
基金 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
关键词 GEOCHEMISTRY glass shards youngest Toba tuff abyssal sediment geochemistry, glass shards, youngest Toba tuff, abyssal sediment
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