Geological Development of the West Sea Area of the Noto Peninsula District in the Neogene Tertiary to Quaternary, Central Japan

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  • 能登半島西方海域の新第三紀～第四紀地質構造形成
  • ノト ハントウ サイホウ カイイキ ノ シンダイ3キ ダイ4キ チシツ コウゾウ ケイセイ

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Abstract

The Noto Peninsula district is known as a N-S trending uplift zone in the Neogene Tertiary to Quaternary. A geological survey mainly composed of sonic prospecting was conducted in the west sea area of the Noto Peninsula. 8 units of stratum, in particular, 5 units in the Quaternary, were found clearly as acoustic stratigraphy. This made it possible to describe the geological development of the Neogene Tertiary to Quaternary of the district in more detail than has ever been reported. The study area can be divided into 2 areas. In the southern part, 2 bilaterally asymmetric folds that are relatively newly developed with a N-S trend have been formed probably by block movement. In the northern part, which is just the southwestern extension of Okunoto Hill, one of the typical tilted block mountains on Noto Peninsula, there are distributed 2 NE-SW trending tilted blocks accompanied by faulting. These tilted blocks have been uplifted by block movement. A relatively new uplift can be found in the block located in the extended part of the N-S trending fold. Consideration based on the facts above and reported show that the newly developed N-S trending geological structure of the Noto Peninsula district has been formed by block movement at least since the late Pliocene.

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