Tephrostratigraphy of Deep-sea Sediments in the Northwestern Pacific and Its Implications for the Chronology of the Past 300kyr

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  • 北西太平洋海底コアにおける過去３０万年間のテフラ層序：広域テフラおよび帯磁率変動曲線の対比に基づく年代モデルの構築
  • ホクセイ タイヘイヨウ カイテイ コア ニ オケル カコ 30マンネンカン ノ テフラソウ ジョ コウイキ テフラ オヨビ タイジリツ ヘンドウ キョクセン ノ タイヒ ニ モトヅク ネンダイ モデル ノ コウチク

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Abstract

A total of 49 distal tephra layers intercalated with four deep-sea sedimentary cores of MR0102-PC1, KR0215-PC2, KR0215-PC3, and KR0217-PC7 from the northwestern Pacific have been studied to establish a highly reliable chronology of the past 300 kyr. Based on the mineral composition of tephras, the shapes and major chemical compositions of volcanic glasses, and stratigraphy, six correlatable tephras are found in these analyzed cores. Further, three of these tephras are correlated with known widespread tephras : Aso-4, On-Pm1, and Ata-Th. Based on the constraint of stratigraphic levels of these tephras, continuous magnetic susceptibility records of these cores and the previously dated sedimentary core of S2612 from the Shatsky Rise are correlated. Based on this correlation, a new chronology for these cores is provided. This chronology reveals that the ages of On-Pm1 and other three tephras can be assigned as approximately 98, 159, 219, and 230 ka in descending sequence. This chronology also provides changes of the sedimentation rates for these cores during the last 300 kyr, which will contribute to future paleoceanographic study of the subarctic boundary of the northwestern Pacific.

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