Stratigraphic correlation of the Tokai Group in the northern Chita Peninsula and the condition of the Sanage-Chita Uplift Zone, Central Japan

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Other Title
  • 知多半島北部の東海層群
  • 知多半島北部の東海層群--層序対比および猿投-知多上昇帯の実態
  • チタ ハントウ ホクブ ノ トウカイソウグン ソウジョ タイヒ オヨビ サナゲ
  • 層序対比および猿投-知多上昇帯の実態

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Abstract

The stratigraphy, geologic structure of the Tokai Group in the southern part of the Naruko, the Arimatsu, and the northern part of the Obu hills are briefly described. The Tokai Group in the study area is divided into the Higashiura, the Obu and the Narumi Formations, in ascending order. The Tokai Group of the area intercalates nine volcanic ash layers. These are the Ishihama, the Ogawa, the Aioi, the Morioka, the Itayama, the Yoshida, the Odaka I, the Odaka II, and the Hosoguchi Volcanic Ash Layers in ascending order. The Ishihama, the Ogawa, the Morioka, the Itayama, the Odaka I, and the Odaka II Volcanic Ash Layers can be correlated with the Marune, the Togo, the Nagakute I & II, the Kumanomae, the Takinomizu I, and the Takinomizu II Volcanic Ash Layers in the Seto Group, respectively. Also, the Ishihama, the Ogawa, the Aioi, the Morioka, the Itayama, the Yoshida, and the Odaka I Volcanic Ash Layers can be correlated with the Kosugaya, the Otani, the Higashidani, the Souri, the Okada, the Yokosuka, and the Tenjinike Volcanic Ash Layers in the Tokoname Group, respectively. The most remarkable findings of the geologic structure in the Tokai Group in our study area are the folds trending in the two directions of NE, and NNW to NW. The folds trending in the NE direction are cut by the folds trending in the NNW to NW directions. Based on the tephrochronology and biostratigraphy, it can be said that the Tokai Group in the study area deposited during the Early Pliocene and the Late Pliocene. The Sanage-Chita uplift zone, which is the remarkable tectonic zone in the Tokai sedimentary basin, is thought to be a single uplift zone turning the trend from NE to SW directions in the study area. Asa result of this study, it is proved that the uplift zone is divided into two uplift zones: i. e., the Sanage Uplift Zone trending in the NE direction, and the Chita Uplift Zone trending in the NNW to NW directions. The Chita Uplift Zone cut the Sanage Uplift Zone, Consequently, it is revealed that the former zone started uplifting later than the latter zone.

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