Geology of Iki Volcano Group : Lava Flow-stratigraphy Mainly Based on K-Ar Dating

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  • 壱岐火山群の地質 : 主にK-Ar年代に基づく溶岩流層序
  • イキ カザングン ノ チシツ オモニ K-Ar ネンダイ ニ モトズク ヨウガ

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Description

The Iki island comprises many monogenetic volcanoes of alkalic basalt, and some volcanoes of various kinds of acidic alkalic and subalkalic rocks. They are composed mainly of scoria cones and lava flows. Excluding some unclassified lava flows that comprise the lower part of the island, 52 lava flows can be recognized. Based on the detailed field observations and the K-Ar age determination of 41 samples, stratigraphic relationship of volcanic rocks and the volcanic history of the monogenetic volcano were established. The volcano on the Iki island has grown over a period of 15 Ma to 0.6 Ma. At least after 3.5 Ma, volcanic activity was intermittent, separated by three quiescent periods. Each active period is 0.3-0.7 million years long and the quiescent period is 0.3-0.4 million years. Eruption volume during the each active period is almost the same (0.012-0.059 km3). Eruption rate of each active period is also almost the same (47-84 m3/year).

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