976. DISCOVERY OF MICROCODIUM TEXTURE FROM THE AKIYOSHI LIMESTONE IN THE AKIYOSHI TERRANE, SOUTHWEST JAPAN

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  • 976. 秋吉石灰岩からの microcodium 組織の発見
  • 秋吉石灰岩からのmicrocodium組織の発見〔英文〕
  • アキヨシ セッカイガン カラ ノ microcodium ソシキ ノ ハッケン

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Abstract

Microcodium texture was discovered from a blackish-brown sparry calcite zone distributed to the south of Mt. Wakatakeyama area, situated in the eastern part of the Akiyoshi Limestone outcrop. This sparry calcite zone is biostratigraphically situated in the upper part of the Quasifusulinoides sp. A zone, which is overlain by the Montiparus sp. A zone, and is middle Kasimovian (early Late Carboniferous) in age. According to the formation process of "Microcodium", which is formed secondarily within a meteoric environment, the author proposes to call it microcodium texture, because "Microcodium" is not a taxonomic unit. From the presence of microcodium texture, it is considered that the blackish-brown sparry calcite zone was formed in a meteoric environment under an exposure surface developed during the sea-level fall. This suggests that an unconformity (sequence boundary) is present just above the blackish-brown sparry calcite zone.

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