Stratigraphy and Chronology of Widespread Tephra Layers during the Past 430 ky in the Kinki District and the Yatsugatake Mountains: Major Element Composition of the Glass Shards Using EDS Analysis

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  • 近畿地方および八ケ岳山麓における過去４３万年間の広域テフラの層序と編年―ＥＤＳ分析による火山ガラス片の主要成分化学組成―
  • キンキ チホウ オヨビ ヤツガタケ サンロク ニ オケル カコ 43マンネンカン ノ コウイキ テフラ ノ ソウ ジョ ト ヘンネン EDS ブンセキ ニ ヨル カザン ガラスヘン ノ シュヨウ セイブン カガク ソセイ
  • Major Element Composition of the Glass Shards Using EDS Analysis
  • EDS分析による火山ガラス片の主要成分化学組成

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Abstract

Energy dispersive Xray Spectrometry (EDS) was applied to measure the major element composition of volcanic glass shards. One hundred three analytical tephra samples were collected from the Takashima-oki drilling core sample on Lake Biwa, as well as some representative drilling core samples in the Osaka coastal area and Middle Pleistocene tephra layers at the foot of the Yatsugatake Mountains. The ages of the principal tephra layers were estimated from the correlation between the biostratigraphic horizons from the core samples and the oxygen isotope stratigraphy. The estimated ages of the Kg, K-Ah, U-Oki, AT, Aso-4, K-Tz, Aso-3, BT44, BT51, Ata-Th, Aso-1, Ng-1, Kkt and BT72 tephra layers are 3.1ka, 7.3ka, 10.7ka, 29ka, 87ka, 91ka, 133ka, 203ka, 216ka, 238ka, 249ka, 294ka, 334ka, and 349ka, respectively. These principal tephra ages provide the estimated ages of other tephra layers using the sediment accumulation rates in the Takashima-oki core. Consequently, this study has reconstructed the tephrostratigraphy and chronology during the past 430ky. Furthermore, it is pointed out that caldera forming eruptions have occurred at low sea level periods just before the maximum high sea level.

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