Hirochika Sumino

The University of Tokyo

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Keisuke Nagao

Massachusetts Institute of Technology

Pedro A. Hernández

Instituto Volcanológico de Canarias

Nemesio M. Pérez

Instituto Volcanológico de Canarias

Gladys V. Melián

Instituto Volcanológico de Canarias

Eleazar Padrón

Instituto Volcanológico de Canarias

R. Burgess

University of Manchester

Germán D. Padilla

Instituto Volcanológico de Canarias

José Barrancos

Instituto Volcanológico de Canarias

Fátima Rodríguez

Instituto Volcanológico de Canarias

Yuji Orihashi

Hirosaki University

Cooperative Institutions

The University of Tokyo

135

Tohoku University

Tokyo Institute of Technology

Japan Agency for Marine-Earth Science and Technology

Kyoto University

Graduate School USA

Tokyo University of Science

National Institute of Advanced Industrial Science and Technology

Instituto Volcanológico de Canarias

Earthquake Engineering Research Institute

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Variations in thermal state revealed by the geochemistry of fumarolic gases and hot-spring waters of the Tateyama volcanic hydrothermal system, Japan

Bulletin of Volcanology (2019)

Kaori Seki Takeshi Ohba Shinnosuke Aoyama Yuichiro Ueno Hirochika Sumino

Hot spring

Fumarole

10.1007/s00445-018-1264-7

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Citations (7)

Searching and detecting earthquake geochemical precursors in CO<sub>2</sub>-rich groundwaters from Galicia, Spain

GEOCHEMICAL JOURNAL (2008)

NEMESIO M. P Eacute REZ P. A. HERN Aacute NDEZ George Igarashi Ignacio Trujillo S. Nakai

The northwestern region of the Iberian Peninsula was traditionally considered a seismically stable area. However, the 1995 and 1997 Galicia earthquakes of magnitude 4.6 and 5.3 produced significant damage in the region (intensity EMS: V), and these events changed the seismic hazard map used for the building code in Spain. Searching for earthquake precursors of these seismic events was performed, and precursory geochemical signatures of the 1995 and 1997 Galicia earthquakes were detected. These precursory signatures were observed in CO2-rich groundwaters from a 120 m deep well at Cabreiroá (Ourense, Galicia), ∼90 km distance from the epicentres. Secular variations of the dissolved Cl- in these CO2-rich groundwaters showed clearly an increase trend three months before the occurrence of two earthquakes of magnitude 4.6 (November 29 and December 24, 1995) in Lugo (Galicia). After the precursory variations of Cl- prior to the earthquakes in 1995, a continuous radon monitoring system was installed at Cabreiorá's well. A significant increase of radon activity in the CO2-rich ground waters was detected four weeks prior to the magnitude 5.3 Galicia earthquake of May 21, 1997. Precursory changes in the chemical and isotopic composition of terrestrial fluids have been mainly attributed to the development of microcracks caused by the regional tectonic strain. The occurrence of these precursory geochemical signatures of CO2-rich groundwaters of magmatic origin in the NW Iberian peninsula probably suggests that high fluid pressure at depth play a major role in triggering earthquakes in the region.

Peninsula

Earthquake magnitude

10.2343/geochemj.42.75

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Citations (48)

Inter-laboratory re-determination of the atmospheric 22Ne/20Ne

Chemical Geology (2023)

Domokos Györe Hirochika Sumino Inseok Yang László Palcsu E. László

Accurate knowledge of the Ne isotopic composition of air is essential for planetary science. While the uncertainty of the noble gas isotopic composition of air has been drastically reduced to the level of ∼0.1% in the last few years thanks to modern techniques, the most widely accepted value of the 22Ne/20Ne ratio of air (0.102 ± 0.0008, Eberhardt et al., 1965) has an uncertainty of ±0.78% (1σ). Here we present the first multi-laboratory re-determination of the atmospheric 22Ne/20Ne. An artificial, high purity mixture of 20Ne and 22Ne was prepared and the 22Ne/20Ne (0.11888 ± 0.00001, 1σ) and 20Ne/22Ne (8.4118 ± 0.0007, 1σ) determined gravimetrically. This gas was used to determine the mass fractionation of five mass spectrometers allowing the air 22Ne/20Ne to be determined (n = 234 analyses). Each laboratory sampled their own local air, used a different gas preparation system and analysis procedure as well as doing their own expansion of the high-pressure artificial Ne gas. Individual air 22Ne/20Ne determinations have uncertainties in the range of 0.01–0.08%. The overall reproducibility of the calculated 22Ne/20Ne of air between the laboratories shows no overdispersion with respect to the individual uncertainties. We report a global value for the atmospheric 22Ne/20Ne of 0.10196 ± 0.00007 (0.07%, 1σ), equivalent of 20Ne/22Ne of 9.808 ± 0.007. This is almost identical to the Eberhardt et al. (1965) value although its uncertainty shows a 12 times reduction. Our study did not verify any of the other previous determinations of atmospheric 22Ne/20Ne. This highly accurate and precise atmospheric 22Ne/20Ne value provides a new reference for atmospheric 21Ne/20Ne determinations and we recalculate (21Ne/20Ne)air of five recent determinations. While this exercise resulted in no significant change to the absolute values, it gives more confidence with respect to the correctness of (21Ne/20Ne)air. We suggest that the revised value for atmospheric 22Ne/20Ne be used routinely in all geoscience applications.

10.1016/j.chemgeo.2023.121900

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Citations (3)

Spatial distribution of halogen compositions near the paleo slab-mantle wedge boundary, example from the Sanbagawa metamorphic belt

Japan Geoscience Union (2020)

Jie Ren Hirochika Sumino Yui Kouketsu Simon Wallis

Slab

Wedge (geometry)

Source

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Citations (0)

Contribution of carbonatite and recycled oceanic crust to petit-spot lavas on the western Pacific Plate

Solid Earth (2024)

Kazuto Mikuni Naoto Hirano Shiki Machida Hirochika Sumino Norikatsu Akizawa

Abstract. Petit-spot volcanoes, occurring due to plate flexure, have been reported globally. As the petit-spot melts ascend from the asthenosphere, they provide crucial information of the lithosphere–asthenosphere boundary. Herein, we examined the lava outcrops of six monogenetic volcanoes formed by petit-spot volcanism in the western Pacific. We then analyzed the 40Ar/39Ar ages, major and trace element compositions, and Sr, Nd, and Pb isotopic ratios of the petit-spot basalts. The 40Ar/39Ar ages of two monogenetic volcanoes were ca. 2.6 Ma (million years ago) and ca. 0 Ma. The isotopic compositions of the western Pacific petit-spot basalts suggest geochemically similar melting sources. They were likely derived from a mixture of high-μ (HIMU) mantle-like and enriched mantle (EM)-1-like components related to carbonatitic/carbonated materials and recycled crustal components. The characteristic trace element composition (i.e., Zr, Hf, and Ti depletions) of the western Pacific petit-spot magmas could be explained by the partial melting of ∼ 5 % crust bearing garnet lherzolite, with 10 % carbonatite flux to a given mass of the source, as implied by a mass-balance-based melting model. This result confirms the involvement of carbonatite melt and recycled crust in the source of petit-spot melts. It provides insights into the genesis of tectonic-induced volcanoes, including the Hawaiian North Arch and Samoan petit-spot-like rejuvenated volcanoes that have a similar trace element composition to petit-spot basalts.

Carbonatite

Asthenosphere

Trace element

10.5194/se-15-167-2024

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Citations (4)

Supplementary material to "Carbonatite-induced petit-spot melts squeezed upward from the asthenosphere beneath the Jurassic Pacific Plate"

Kazuto Mikuni Naoto Hirano Shiki Machida Hirochika Sumino Norikatsu Akizawa

Asthenosphere

Carbonatite

10.5194/egusphere-2023-1499-supplement

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Alkali basalt from the Seifu Seamount in the Sea of Japan: post-spreading magmatism in a back-arc setting

Solid Earth (2020)

Tomoaki Morishita Naoto Hirano Hirochika Sumino Hiroshi Sato Tomoyuki Shibata

Abstract. We present geochemical and 40Ar∕39Ar age data for a peridotite xenolith-bearing basalt dredged from the Seifu Seamount (SSM basalt) in the northeast Tsushima Basin, southwest Sea of Japan. An 40Ar∕39Ar plateau age of 8.33±0.15 Ma (2σ) was obtained for the SSM basalt, indicating that it erupted shortly after the termination of back-arc spreading in the Sea of Japan. The SSM basalt is a high-K to shoshonitic alkali basalt that is characterized by light rare earth element enrichment. The trace element features of the basalt are similar to those of ocean island basalt, although the Yb content is much higher, indicating formation by the low-degree partial melting of spinel peridotite. The Nd, Sr, and Pb isotopic compositions of the SSM basalt differ from those of back-arc basin basalts in the Sea of Japan. The Sr–Nd isotopic composition of the SSM basalt suggests its source was depleted mid-ocean ridge mantle containing an enriched mantle (EM1) component. The SSM basalt was formed in a post-back-arc extension setting by the low-degree partial melting of an upwelling asthenosphere that had previously been associated with the main phase of back-arc magmatism.

Peridotite

Seamount

Asthenosphere

Alkali basalt

Island arc

Xenolith

10.5194/se-11-23-2020

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Citations (8)

Volatile element transport within a closed system constrained by halogens and noble gases in mantle wedge peridotites

Japan Geoscience Union (2017)

Masahiro Kobayashi Hirochika Sumino Keisuke Nagao Satoko Ishimaru Shoji Arai