Pleistocene chronostratigraphy based on correlation of tephra in the Nishimikawa Plain, Aichi Prefecture, central Japan

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  • ABE Tomoya
    AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation
  • MIZUNO Kiyohide
    AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation
  • NAYA Tomonori
    AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation

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Other Title
  • テフラ対比に基づく愛知県西三河平野地下に分布する更新統の年代層序

Abstract

<p>To construct chronostratigraphy of the Pleistocene sediment beneath the Nishimikawa Plain, tephra beds in five boring cores (GS-HKN-1, TK No.1, GS-NSO-2, ISJ, and N214 cores) drilled in the plain were correlated to widespread tephra based on the petrographic characteristics of tephra layers, and major and trace element composition of volcanic glass shards. The HKN1-v27 tephra in the GSHKN-1 core, the NSO2-v27 tephra in the GS-NSO-2 core, and the ISJ-v30 tephra in the ISJ core were corresponded to Ks10 tephra (MIS 13~MIS 14) or Ks18 tephra (MIS 15). The TK1-v18 tephra and the TK1-v23 tephra in the TK No. 1 core were correlated to Aso-3 tephra (MIS 5e) and Kkt tephra (MIS 9), respectively. The N214-v30 tephra in the N214 core was correlated to Ata-Th tephra (MIS 7). Based on the correspondence between the age of widespread tephra and MIS, depositional period of facies unit of Pleistocene sediment in each boring core were estimated as follows. The unit 7 in the GS-HKN-1 core, the unit N2-1 in the GS-NSO-2 core, and the unit 1 in the ISJ core were MIS 13~MIS 15. The unit C in the TK No. 1 core, the unit 1 in the N214 core, and the unit B in the TK No. 1 core, were MIS 9, MIS 7, and MIS 5e, respectively. According to these results, the ages of Pleistocene sediment beneath the plain were varied with core site, and it is interpreted as a complex stratigraphic sequence of in the plain.</p>

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