39 Result(s)

Article

Hf-W dating of zircon in mesosiderite with high-pressure sintered standard

New standard zircons applicable to in situ analysis of Hf/W ratio by Nanoscale secondary ion mass spectrometer (NanoSIMS) were prepared and applied to Hf-W dating of a differentiated meteorite classified as me...

Yuji Sano, Yuta Koyama, Naoto Takahata… in Journal of Analytical Science and Technolo… (2024)

Article

Author Correction: Heterogeneous nitrogen fixation rates confer energetic advantage and expanded ecological niche of unicellular diazotroph populations

Takako Masuda, Keisuke Inomura, Naoto Takahata, Takuhei Shiozaki… in Communications Biology (2023)

Article

Older magma at Aso caldera than at Unzen stratovolcano in south west Japan as recorded through helium isotopes

Stratovolcanoes form conical mountains by ejecta and lava, while caldera volcanoes have depressions caused by post caldera collapse. Few studies have investigated relationships between this morphology differen...

Yuji Sano, Takanori Kagoshima, Maoliang Zhang… in Communications Earth & Environment (2023)

Article

Influence of normal tide and the Great Tsunami as recorded through hourly-resolution micro-analysis of a mussel shell

We report here hourly variations of Mg/Ca, Sr/Ca, and Ba/Ca ratios in a Mediterranean mussel shell (Mytilus galloprovincialis) collected at the Otsuchi bay, on the Pacific coast of northeastern Japan. This bivalv...

Yuji Sano, Tomoyo Okumura, Naoko Murakami-Sugihara, Kentaro Tanaka… in Scientific Reports (2021)

Article

Mantle-derived helium released through the Japan trench bend-faults

Plate bending-related normal faults (i.e. bend-faults) develop at the outer trench-slope of the oceanic plate incoming into the subduction zone. Numerous geophysical studies and numerical simulations suggest t...

**-Oh Park, Naoto Takahata, Ehsan Jamali Hondori, Asuka Yamaguchi… in Scientific Reports (2021)

Article

Landside tritium leakage over through years from Fukushima Dai-ichi nuclear plant and relationship between countermeasures and contaminated water

There has been tritium groundwater leakage to the land side of Fukushima Dai-ichi nuclear power plants since 2013. Groundwater was continuously collected from the end of 2013 to 2019, with an average tritium c...

Katsumi Shozugawa, Mayumi Hori, Thomas. E. Johnson, Naoto Takahata… in Scientific Reports (2020)

Article

High nitrogen solubility in stishovite (SiO₂) under lower mantle conditions

Nitrogen is a crucial volatile element in the early Earth’s evolution and the origin of life. Despite its importance, nitrogen’s behavior in the Earth's interior remains poorly understood. Compared to other vo...

Ko Fukuyama, Hiroyuki Kagi, Toru Inoue, Sho Kakizawa, Toru Shinmei… in Scientific Reports (2020)

Article

Heterogeneous nitrogen fixation rates confer energetic advantage and expanded ecological niche of unicellular diazotroph populations

Nitrogen fixing plankton provide nitrogen to fuel marine ecosystems and biogeochemical cycles but the factors that constrain their growth and habitat remain poorly understood. Here we investigate the importanc...

Takako Masuda, Keisuke Inomura, Naoto Takahata, Takuhei Shiozaki… in Communications Biology (2020)

Article

Coseismic changes in groundwater level during the 2018 Hokkaido Eastern Iburi earthquake

Six wells were continuously monitored in Hokkaido, northern Japan, to relate groundwater level changes to regional seismic activity. Groundwater level changes following the 2018 Hokkaido Eastern Iburi earthqua...

Tomo Shibata, Ryo Takahashi, Hiroaki Takahashi… in Earth, Planets and Space (2020)

Article

Isotopic ratios of uranium and caesium in spherical radioactive caesium-bearing microparticles derived from the Fukushima Dai-ichi Nuclear Power Plant

Spherical radioactive caesium (Cs)-bearing microparticles (CsMPs) were emitted during the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident in March, 2011. The emission source (timing) and formation proc...

Yuichi Kurihara, Naoto Takahata, Takaomi D. Yokoyama, Hikaru Miura… in Scientific Reports (2020)

Article

Evidence in the Japan Sea of microdolomite mineralization within gas hydrate microbiomes

Over the past 15 years, massive gas hydrate deposits have been studied extensively in Joetsu Basin, Japan Sea, where they are associated primarily with active gas chimney structures. Our research documents the...

Glen T. Snyder, Ryo Matsumoto, Yohey Suzuki, Mariko Kouduka… in Scientific Reports (2020)

Article

Mantle degassing along strike-slip faults in the Southeastern Korean Peninsula

On September 12, 2016, a M_L 5.8 earthquake hit Gyeongju in the southeastern part of the Korean Peninsula (SeKP), although the area is known to be far from the boundary of the active plate. A number of strike-slip...

Hyunwoo Lee, Heejun Kim, Takanori Kagoshima, **-Oh Park… in Scientific Reports (2019)

Article

Mantle fluids associated with crustal-scale faulting in a continental subduction setting, Taiwan

We report noble gas signatures of groundwater, hot springs, and bedrock samples from a major fault system that separates regional-scale blocks of accreted, continental materials in southern Taiwan. Despite the...

Ai-Ti Chen, Chuan-Chou Shen, Timothy B. Byrne, Yuji Sano… in Scientific Reports (2019)

Article

Enhanced flux of extraterrestrial ³He across the Permian–Triassic boundary

The ca 252 Ma Permian–Triassic boundary (PTB) represents the most severe mass extinction event of the Phanerozoic, with the disappearance of ~ 80% of marine invertebrate species. Large-scale eruption of the Siber...

Tetsuji Onoue, Naoto Takahata, Mitsutaka Miura… in Progress in Earth and Planetary Science (2019)

Article

Groundwater oxygen isotope anomaly before the M6.6 Tottori earthquake in Southwest Japan

Geochemical monitoring of groundwater in seismically-active regions has been carried out since 1970s. Precursors were well documented, but often criticized for anecdotal or fragmentary signals, and for lacking...

Satoki Onda, Yuji Sano, Naoto Takahata, Takanori Kagoshima… in Scientific Reports (2018)

Article

Origin of methane-rich natural gas at the West Pacific convergent plate boundary

Methane emission from the geosphere is generally characterized by a radiocarbon-free signature and might preserve information on the deep carbon cycle on Earth. Here we report a clear relationship between the ...

Yuji Sano, Naoya Kinoshita, Takanori Kagoshima, Naoto Takahata… in Scientific Reports (2017)