Basalts of Nishikurosawa Stage of Early to Middle Miocene in the Akita and the Niigata Oil Fields, Northeast Japan.

Sato, Osamu; Sato, Tokiyuki

doi:10.3720/japt.57.91

Cited by 10 publications

(3 citation statements)

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“…Radiometric age in red: this study. (1) Sato and Sato (1992), (2) Sato et al (1991), (3) Ozawa et al (1982), (4) Ozawa and Ohguchi (1979), (5) Ozawa et al (1988), (6) Aida (1984), (7) Kato and Yanagisawa (2021), (8) Usuta et al (1978), (9) Tsuji et al (1991), (10) Kato et al (2008), (11) Yoshioka et al (2021).…”

Section: Geologic Settingmentioning

confidence: 99%

U–Pb and fission‐track dating of Miocene hydrocarbon source rocks in the Akita Basin, Northeast Japan, and implications for the timing of paleoceanographic changes in the sea of Japan

Nakajima

Iwano

Danhara³

et al. 2023

Island Arc

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Middle to Late Miocene organic‐rich siliceous mudstones (Onnagawa Formation) in the Akita Basin, Northeast Japan have been an important target for both paleoceanographic studies and hydrocarbon exploration in Japan. However, the reliable age of their formation has remained poorly constrained. Here, we report new zircon U–Pb and fission‐track ages of the Onnagawa Formation from a previously well‐studied outcrop route in the Yashima area, central Akita Basin. The thin tuff bed in the lower Onnagawa Formation was dated at around 11.6 Ma, whereas thin tuff beds in the upper Onnagawa Formation was dated at 10.4–9.6 Ma. The new age model constrains the base of the succession as older than 15.6–13.8 Ma and the top of the succession as 8.7–8.2 Ma. The results suggest that the lowest part of the succession was deposited before the Onnagawa Stage. The new age model indicates a rapid deposition in the lower Onnagawa Stage. The new age model also clarifies a temporary decrease in the sedimentation rate during 10.9–9.4 Ma, which coincided with a hiatus or slow deposition reported from other areas along the Sea of Japan coast. The new age model also revises the timing of paleoceanographic changes, of the best hydrocarbon source horizon, and of hydrothermal activity responsible for seafloor chemoautotrophic communities in the Akita Basin. This revised timing reveals that the onset of paleoceanographic changes from oxidizing to anoxic bottom environments favorable for hydrocarbon source rock formation was closely related to the tectonic uplift of the Northeast Japan Arc at ~12 Ma, whereas the timing of hydrothermal activity was related to the following extensional tectonics at ~9 Ma. The results of this study thus shed light on hitherto unclarified relationships between tectonics, volcanism, and paleoceanographic changes in the Sea of Japan.

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Section: Geologic Settingmentioning

confidence: 99%

U–Pb and fission‐track dating of Miocene hydrocarbon source rocks in the Akita Basin, Northeast Japan, and implications for the timing of paleoceanographic changes in the sea of Japan

Nakajima

Iwano

Danhara³

et al. 2023

Island Arc

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“…O. Sato and Sato (1992) reported that the calcareous nannofossil assemblages in mudstones amongst the lower part of the basaltic rocks and in mudstones that overlie the basaltic rocks are from Ma) biozones of Martini (1971), respectively. A benthic foraminifera assemblage in the Tachiyazawa Formation, which is overlain by the Aosawa Formation to the south of the study area, has been correlated with the N8 (16.38-15.10 Ma) planktonic foraminiferal biozone (H. Sato et al, 1986).…”

Section: Geological Settingmentioning

confidence: 99%

Age and associated stress field of middle Miocene back‐arc basalt magmatism in Northeast Japan

Hosoi

Yamaji

Iwano³

et al. 2020

Island Arc

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A large volume of middle Miocene basaltic rocks is widely distributed across the back-arc region of Northeast Japan, including around the Dewa Mountains. Petrological research has shown that basaltic rocks of the Aosawa Formation around the Dewa Mountains were generated as a result of the opening of the Sea of Japan. To determine the precise ages of the middle Miocene basaltic magmatism, we conducted U-Pb and fission-track (FT) dating of a rhyolite lava that constitutes the uppermost part of the Aosawa Formation. In addition, we estimated the paleostress field of the volcanism using data from a basaltic dike swarm in the same formation. The rhyolite lava yields a U-Pb age of 10.73 ±0.22 Ma (2σ) and a FT age of 10.6 ±1.6 Ma (2σ), and the paleostress analysis suggests a normal-faulting stress regime with a NW-SEtrending σ 3 -axis, a relatively high stress ratio, and a relatively high magma pressure.Our results show that the late Aosawa magmatism occurred under NW-SE extensional stress and ended at $ 11 Ma.

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“…In the center of the Akita Basin as well as of the Niigata Basin, thick piles of basalts accumulated in grabens [34][35]. The Middle Miocene northeast Japan was characterized by a distinct bimodal volcanism in which basalts dominated in back-arc side whereas fore-arc side was dominated by felsic rocks [23].…”

Section: Rapid Riftingmentioning

confidence: 99%

Late Cenozoic Tectonic Events and Intra-Arc Basin Development in Northeast Japan

Nakajima¹

2013

Mechanism of Sedimentary Basin Formation - Multidisciplinary Approach on Active Plate Margins

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Basalts of Nishikurosawa Stage of Early to Middle Miocene in the Akita and the Niigata Oil Fields, Northeast Japan.

Cited by 10 publications

References 0 publications

U–Pb and fission‐track dating of Miocene hydrocarbon source rocks in the Akita Basin, Northeast Japan, and implications for the timing of paleoceanographic changes in the sea of Japan

U–Pb and fission‐track dating of Miocene hydrocarbon source rocks in the Akita Basin, Northeast Japan, and implications for the timing of paleoceanographic changes in the sea of Japan

Age and associated stress field of middle Miocene back‐arc basalt magmatism in Northeast Japan

Late Cenozoic Tectonic Events and Intra-Arc Basin Development in Northeast Japan

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