Magnetic Susceptibility of the Daisen Tephra Formation in West Japan and its Applicability to Tephrostratigraphy.

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  • 大山火山灰層の帯磁率特性とテフラ層序へのその応用
  • 大山火山灰層の帯磁率特性とテフラ層序へのその応用〔英文〕
  • ダイセン カザンバイソウ ノ タイジリツ トクセイ ト テフラ ソウジョ エ

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Abstract

Magnetic susceptibility of tephra and brown-soil beds distributed at the foot of Mt. Daisen was measured at seven sites to examine its applicability to correlate tephra beds. The measurements show that the susceptibility values of each correlatable tephra bed are within a narrow range, regardless of the site. Each tephra bed has a characteristic pattern of vertical susceptibility change, which is useful for detailed correlation between tephra beds, and also between invisible horizons within the tephra beds of almost homogeneous lithofacies. In brown-soil beds, visually indistinct horizons of volcanic-sand-type tephra fall could be identified at the remarkable peaks of susceptibility, by tracing the peaks horizontally. Magnetic susceptibility profiles measured along vertical sections of tephra and brown-soil beds have a high potential of application to tephrostratigraphy and tephrochronology.

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