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• Boron isotopic study on coral for seawater paleo-pH reconstruction

• Tectonics and magmatism of the Okinawa Trough

• Petrology of large caldera in south Kyushu

• Evolution and geochemistry of the West Philippine Basin

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• Petrology and geochemistry of volcanic rocks from the Okinawa Trough and Ryukyu Islands

  1992.03

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• Reply to discussion of "An assessment of small Island hydrological research activity conducted in the Oceania Region"<SUP>1</SUP>

  Leong, C; Solomone, M; Shinjo, R; Tomojiri, D; Uchiyama, C; Yasumoto, J; Razafindrabe, B

  HYDROLOGICAL SCIENCES JOURNAL ( Hydrological Sciences Journal )    2024.08 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Metagenomic analysis of the microbial communities and associated network of nitrogen metabolism genes in the Ryukyu limestone aquifer

  Maruyama, R; Yasumoto, K; Mizusawa, N; Iijima, M; Yasumoto-Hirose, M; Iguchi, A; Hermawan, OR; Hosono, T; Takada, R; Song, KH; Shinjo, R; Watabe, S; Yasumoto, J

  SCIENTIFIC REPORTS ( Scientific Reports )  14 ( 1 ) 4356   2024.02 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  Abstract While microbial biogeochemical activities such as those involving denitrification and sulfate reduction have been considered to play important roles in material cycling in various aquatic ecosystems, our current understanding of the microbial community in groundwater ecosystems is remarkably insufficient. To assess the groundwater in the Ryukyu limestone aquifer of Okinawa Island, which is located in the southernmost region of Japan, we performed metagenomic analysis on the microbial communities at the three sites and screened for functional genes associated with nitrogen metabolism. 16S rRNA amplicon analysis showed that bacteria accounted for 94–98% of the microbial communities, which included archaea at all three sites. The bacterial communities associated with nitrogen metabolism shifted by month at each site, indicating that this metabolism was accomplished by the bacterial community as a whole. Interestingly, site 3 contained much higher levels of the denitrification genes such as narG and napA than the other two sites. This site was thought to have undergone denitrification that was driven by high quantities of dissolved organic carbon (DOC). In contrast, site 2 was characterized by a high nitrate-nitrogen (NO₃-N) content and a low amount of DOC, and this site yielded a moderate amount of denitrification genes. Site 1 showed markedly low amounts of all nitrogen metabolism genes. Overall, nitrogen metabolism in the Ryukyu limestone aquifer was found to change based on environmental factors.

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• Mechanism of denitrification in subsurface-dammed Ryukyu limestone aquifer, southern Okinawa Island, Japan

  Hermawan, OR; Hosono, T; Yasumoto, J; Yasumoto, K; Song, KH; Maruyama, R; Iijima, M; Yasumoto-Hirose, M; Takada, R; Hijikawa, K; Shinjo, R

  SCIENCE OF THE TOTAL ENVIRONMENT ( Science of the Total Environment )  912   169457 - 169457   2024.02 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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• Petrology of the Miocene Tomari volcanic rocks in the SN-010 deep core from the Shimokita Peninsula in northern Japan and its correlation to the surface geology

  Aizawa Masataka, Inaba Mitsuru, Okamura Satoshi, Shinjo Ryuichi

  The Journal of the Geological Society of Japan ( The Geological Society of Japan )  129 ( 1 ) 587 - 602   2023.12 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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  <p>The Tomari volcanic rocks were products of the Middle Miocene volcanic front of the NE Japan arc. The volcanic activity has been divided into four stages with five lithologies, as assessed from surface geology. Eruptive rocks of Stage I (oldest) are the Kanatsuyama Andesite, the lower and upper units of Stage II are the Gassan Andesite and Tomari Basalt, respectively, Stage III comprises the Takahoko Andesite, and Stage IV is the Fukkoshi Andesite. Coring investigation was conducted on the northwestern side of the exposed Tomari volcanic rocks on central Shimokita Peninsula, Aomori Prefecture, in the northern NE Japan arc during 2014–2016. In the SN-010 core, the Tomari volcanic rocks occur from the bottom of the core at 1484 m below the surface to 308 m below the surface; the lower boundary of the volcanic rocks was not penetrated in the SN-010 borehole. We collected eight samples from the core and described their petrological characteristics to correlate the volcanic stages of the Tomari volcanic rocks between the core and surface geology.</p><p>Modal compositions, especially abundant olivine phenocrysts and the occurrence of chromium-spinel, define the Tomari Basalt as a rock with a unique signature within the exposed Tomari volcanic rocks. The Tomari Basalt includes a primitive basalt characterized by high whole-rock contents of MgO, Cr, and Ni compared with the other Tomari volcanic rocks. The SN-010 core samples at a depth of ~1003 m have similar petrological characteristics to those of the Tomari Basalt, except that olivine phenocrysts in the core samples are perfectly altered.</p><p>LILE/HFSE ratios, such as Ba/Nb, change below 1197.86 m (deep core samples) and above 1003.35 m (shallow core samples) in the SN-010 core. Ratios for shallow core samples are similar to those for surface samples. HFSE/HFSE ratios, such as Zr/Nb, show similar values among deep, shallow, and surface samples, indicating a cognate source mantle. These findings imply changes in the slab-derived component during magma generation associated with the opening of the Japan Sea.</p>

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• 環境水のホウ素同位体分析のための簡易分離方法の開発—認証標準物質のホウ素同位体組成の初報告—

  宋 科翰, 新城 竜一, 諸見里 結美

  環境科学会誌 ( 社団法人 環境科学会 )  36 ( 6 ) 211 - 217   2023.11 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

  　View Summary

  <p>ホウ素同位体は，河川水や地下水中の汚染物質の定量的評価など，環境問題の解決に有効なトレーサーである。同位体分析の正確度を評価するためには，マトリックスが類似し値付けされた標準物質（RM）が必要である。しかし，ホウ素濃度の保証値はあるものの，同位体組成が既知の標準物質はまだ少ない。今回，河川水（NMIJ CRM 7202-c, JSAC 0301-4a）および水道水（NMIJ CRM 7203-a）の日本産認証標準物質（CRM）のホウ素同位体組成を初めて報告する。あわせて，0.1 mLの陽イオン交換樹脂カラムのみを用いた，環境水からのホウ素の簡便な分離法も開発した。この方法は煩雑な分離を簡略化したもので，ホウ素の回収率は97％以上，マトリックス元素の分離効率は98％以上である。δ¹¹B値は7202-cが−8.81±0.19‰，0301-4aが14.33±0.49‰，7203-aが17.86±0.28‰である。また，応用例として市販されている4種類のペットボトル水（富士山，六甲，阿蘇山，久米島）を分析した。報告した分離方法は，簡便かつ短時間での処理であり，ブランクレベルも低く，ホウ素の測定効率を向上させることができる。</p>

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Books 【 display / non-display 】

Books 【 display / non-display 】

• Wadomari Town's Progress: the town history book of Wadomari, Kagoshima, Japan

  Ryuichi SHINJO ( Part: Allotment Writing )

  2024.05

• 豊臣石垣公開施設整備に伴う発掘調査

  大阪市文化財協会 ( Part: Allotment Writing )

  大阪市文化財協会  2024.03

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Other Papers 【 display / non-display 】

• Tungsten isotopic compositions of Ethiopian and Aden Bay basalts and the Samoan ocean island: implications for core-mantle interaction in their source

  鈴木勝彦, 賞雅朝子, 賞雅朝子, 深海雄介, 深海雄介, 飯塚毅, 折橋裕二, 新城竜一, 羽生毅

  日本地球惑星科学連合大会予稿集(Web)   2020   2020

   

  J-GLOBAL

• 現生腕足動物殻の微量金属元素濃度に関する基礎的研究

  西尾拓哉, 高柳栄子, 浅海竜司, 新城竜一, 山本鋼志, 井龍康文

  日本古生物学会年会講演予稿集   2018   29   2018.06

   

  J-GLOBAL

• Groundwater in the Ryukyu limestone aquifer

  Yasumoto Jun, Nozaki Masashi, Nakaya Shinji, Harue Masuda, Hosono Takahiro, Toki Tomohiro, Shinjo Ryuichi

  Abstracts of Annual Meeting of the Geochemical Society of Japan ( GEOCHEMICAL SOCIETY OF JAPAN )  65 ( 0 ) 164   2018

   

  DOI CiNii Research

Presentations 【 display / non-display 】

Presentations 【 display / non-display 】

• Changes in Subduction Conditions Revealed by Nd-Hf Isotope Compositions: Cretaceous Volcanic Rocks from Sakhalin and Middle Miocene Volcanic Rocks from the Shimokita Peninsula

  Masataka Aizawa, Satoshi Okamura, Ryuichi SHINJO

  36th MSSJ Hokkaido-area Colloquium  2024.08  -  2024.08 

• 電磁流量計を使用した琉球石灰岩帯水層からの非常に速く局所的な海底地下水湧出の直接測定法の開発

  安元純, 安元剛, 浅井和見, Leong Chris, 飯島真理子, 細野高啓, 新城竜一, 宋科翰, 中屋眞司, 井口亮, Bam Razafindrabe, 谷口真人

  JpGU 2024  2024.05  -  2024.05 

• 電気抵抗トモグラフィーと数値解析を統合した黒島における淡水レンズの賦存形態と地下水流動特性の把握

  南隆正, 安元純, 安元剛・Leong Chris, 飯島真理子, 細野高啓, 新城竜一, SONG KE-HAN, 谷口真人, 高橋昌弘, 三浦豪, 澤野陽介, 田原康博

  JpGU 2024  2024.05  -  2024.05 

• Assessing the Influence of NO3-N in the Seawater on the Composition of Benthic Communities: Utilizing Remote Sensing Techniques

  Pingkan Mayestika Afgatiani, Ryuichi Shinjo, Fitra Annurhutami

  JpGU 2024  2024.05  -  2024.05 

• Chemical and Isotopic Characteristics of Pore Water in Surface Sediments of the Southern Okinawa Trough Back-arc Basin

  JpGU 2024  2024.05  -  2024.05 

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Grant-in-Aid for Scientific Research 【 display / non-display 】

Grant-in-Aid for Scientific Research 【 display / non-display 】

• Determination of acceptable terrestrial phosphate loads for coral growth: Focusing on accumulated phosphorus

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2023.04  -  2026.03 

  Direct: 3,600,000 (YEN)  Overheads: 4,680,000 (YEN)  Total: 1,080,000 (YEN)

• Eruption prediction of the volcanoes where precursory phenomena are continuing: petrologic approach of eruption materials.

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2022.04  -  2025.03 

  Direct: 3,300,000 (YEN)  Overheads: 4,290,000 (YEN)  Total: 990,000 (YEN)

• Formation mechanism of seafloor massive sulfide deposit based on geochemical studies of gangue minerals

  Grant-in-Aid for Scientific Research(B)

  Project Year: 2021.04  -  2024.03 

  Direct: 10,200,000 (YEN)  Overheads: 13,260,000 (YEN)  Total: 3,060,000 (YEN)

• The active volcano Mt. Zao: Study of shallow magma chamber structure and the time sclaes of magma chamber processes for the eruption

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2017.04  -  2020.03 

  Investigator(s): Masao Ban 

  Direct: 3,400,000 (YEN)  Overheads: 4,420,000 (YEN)  Total: 1,020,000 (YEN)

  　View Summary

  We performed petrologic study on eruption products of the Goshikitake, the newest edifice of Zao volcano, and obtained following results. (1) By examining whole rock and mineral chemistry, couple with mineral texture, we revealed the shallow magma chamber located ca. 6 km depth and was rather heterogeneous. (2) The diffusion calculations based on chemical zoning of orthopyroxene phenocrysts indicated that the longest residence time of the phenocrysts in the chamber after the injection of deeper mafic magmas was more than ca. 50 years and most frequently one was less than several years. (3) Sr isotopic analyses revealed eruption products from Okama crater has different origin from the other eruption products of Goshikidake.

• Magma plumbing system beneath Chokai volcano

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2014.04  -  2017.03 

  Investigator(s): Ban Masao 

  Direct: 3,700,000 (YEN)  Overheads: 4,810,000 (YEN)  Total: 1,110,000 (YEN)

  　View Summary

  Chokai volcano is a Quaternary stratovolcano in NE Japan. The newest collapse was at BC466 and a caldera was formed. Effusion of lavas in this caldera has continued intermittently to present. This volcano erupted (Jougan eruption) after the Jougan big earthquake. Thus, after 2011 Tohoku earthquake, it is important to examine the geologic and petrologic features around Jougan eruption to predict future eruption. Detailed volcano stratigraphic analysis reveald that the eruption rate decreased and the compositions of mafic magma were changed after the Jougan earthquake. By the petrologic investigations revealed followings. The magma plumbing system is composed of shallow chamber filled by lower temperature magma which was repeatedly infused by mafic magmas from depths, which resulted in the eruptions. The time scales from the infusions to th eruptions are estimated to be less than several years. The compositions of the mafic magma changed at the timing of the Jogan earthquake.

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Social Activity 【 display / non-display 】

• 2024.07

  　

  　

• 2023.07

  　

  　

• 2023.06

  　

  　

• 2022.07

  　

  　

• 2022.05

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  2022.07

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Media Coverage 【 display / non-display 】

Media Coverage 【 display / non-display 】

• 沖永良部島での出前授業：地質学教室  Newspaper, magazine

  南海日日新聞社  南海日日新聞  2023.10

  Author： Other 

• NHK総合1７月１７日 海の日 沖縄やんばる編 〜ギョギョギョ 沖縄やんばるスペシャル〜 取材協力

  NHK  〜ギョギョギョ 沖縄やんばるスペシャル〜  2023.7

  Author： Myself 

• 総合地球環境学研究所、与論島でサンゴの掘削調査 陸と海の関係調べる  Newspaper, magazine

  奄美群島南三島経済新聞  2022.10

  Author： Other 

• SKYMARK Inflight Magazine -SORA NO ASHIATO-

  SKYMARK AIRLINES  SKYMARK Inflight Magazine -SORA NO ASHIATO-  Special issue "Let's go see the sea of Miyakojima"  2022.8

• 地球研、プロジェクションマッピングで“地下水の流れ”可視化 汚染対策支援ツールに  Newspaper, magazine

  日刊工業新聞  日刊工業新聞  2022.7

  Author： Other 

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