Diatom Biostratigraphy of the Upper Miocene to Pliocene in the Yufutsu oil and gas field, Hokkaido, Japan

The Ishikari-Hidaka sedimentary basin which ranges from Iwamizawa to the coastal area of Hidaka District, Hokkaido, is occupied by thick Neogene sedimentary rocks. These include Miocene rocks that consist mainly of sandstone, mudstone, interbedded sandstone and conglomerate gravity flow deposits , siliceous hard mudstone, and diatomaceous mudstone, showing various vertical and lateral changes in lithofacies. We have surveyed the Miocene Takinoue, Kawabata, Iwamizawa and Oiwake Formations exposed in the southern part of Iwamizawa City and have examined radiolarian assemblages of these formations to discuss the temporal sedimentary history of the basin. Radiolarian fossils from the examined geologic section are indicative of the Dendrospyris? sakaii Zone to Lychnocanoma magnacornuta Zone, suggesting that the Kawabata, Iwamizawa, and Oiwake Formations were deposited during the Middle Miocene ~15 to ~12.2 Ma , the late Middle Miocene ~12.2 to 11.7 Ma , and the Late Miocene after 11.7 Ma , respectively. Correlation between the study area, Yubari area and Hobetsu area revealed diachronous nature in change from domination of coarse gravity flow deposition of the Kawabata Formation to biosiliceous fine-grained facies of the Iwamizawa Formation.

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Diatom Biostratigraphy of the Upper Miocene to Pliocene in the Yufutsu oil and gas field, Hokkaido, Japan

Cited by 4 publications

References 2 publications

Miocene-Pliocene Foraminifera from the subsurface sections in the Yufutsu Oil and Gas Field, Hokkaido

Miocene-Pliocene Foraminifera from the subsurface sections in the Yufutsu Oil and Gas Field, Hokkaido

Occurrence patterns of the Pliocene to Pleistocene planktonic foraminiferal marker beds with relation to the timing of hydrocarbon trap formation, offshore and coastal areas of Akita Prefecture, Japan

Radiolarian biostratigraphy of the Miocene rocks in the vicinity of the Horomui River, Iwamizawa city, Hokkaido

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