熊野灘のアカホヤ火山灰

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タイトル別名
  • クマノ ナダ ノ アカホヤ カザンバイ
  • Identification of Akahoya volcanic ash, an age diagnostic tephra, and Holocene sedimentation rate in the Kumanonada off the southeastern coast of Kii peninsula, Japan

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White volcanic ash layes, with thickness of 2cm to 1Ocm, were found in the short cores from the deep-sea floor of Kumanonada at depths of 1,650m to 2,083m. Their depth in the cores varies from 54cm to 167cm from each core-top. Their chemical composition (Na, Mg, Al, Si, K, Ca. Ti, Fe), determined by energy dispersive X-ray spetctrometry (EDX), is all identical. Statistically the tephra is correlated to Akahoya volcanic ash, which was ejected 6,300 years ago from the Kikai caldera situating in the southern off-coast of Satsuma Peninsula, South Kyushu. The mean sedimentation rate for the last 6,300 years in this basin is calculated to be 26 to 8.6cm/Kyr (17cm/Kyr in average).

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