Volcanic ash markers in the Nobegawa route, east of Ojiya City and their regional correlation in the Niigata sedimentary basin

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  • Miura Mitsuyo
    Department of Earth Science, Faculty of Education, Niigata University
  • Kurokawa Katsuki
    Department of Earth Science, Faculty of Education, Niigata University

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Other Title
  • 小千谷市野辺川ルートにおける珪長質火山灰鍵層とその対比
  • 小千谷市野辺川ルートにおける珪長質火山灰鍵層とその対比--新潟堆積盆における広域対比の検討
  • オジヤシ ノベガワ ルート ニ オケル ケイチョウシツ カザンバイ カギソウ
  • 新潟堆積盆における広域対比の検討

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Regional correlation in the Niigata sedimeneary basin were attempted in respect to the Pliocene volcanic ash markers in the Nobegawa route, Ojiya City. The correlation of volcanic ash markers were made based on their horizon, unit association, lithofacies, petrographic characteristics of components, and chemical composition of glass shards. Among the ash markers in the Nobegawa route, the following ashes were regionally correlated over more than 50km with those in the Higashikubiki and Uonuma Hills, and Hachikoku, Chuo and Nishiyama Oil Fields; that is NA3-NA5 with the Suganuma allanite-bearing ash zone (SAZ) such as Sec and OKIII ashes, NA7 with Chw and Isgp-A ashes, NA9 with Fup and OKII ashes, NA10 with Tsp, OKI and Kag ashes, NA11 with Sgs ash, and NA13 with Hap-2, Isg-g and Kap ashes. On the basis of the result of ash correlation, regional contemporaneous heterotopic facies relation was revealed. Upper shallow marine to fluvial environments initially appeared in the southern Higashikubiki and Uonuma areas in late Pliocene while lower shelf to slope environment contemporary existed in the central part of the basin. The basin was progradated by progressive extension of upper shallow marine to fluvial environments.

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