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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

Thesis 【 display / non-display 】

Thesis 【 display / non-display 】

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

  1992.03

Published Papers 【 display / non-display 】

Published Papers 【 display / non-display 】

• Origin of Neoproterozoic anorthosites in the Wadi El Dib ultramafic-mafic layered intrusions, Egypt

  Eliwa, HA; Deevsalar, R; Mahdy, NM; Pan, Y; El-Gameel, K; El-Desouky, HA; Khamis, H; Murata, M; Andresen, A; Chew, D; El Sundolly, H; Fawzy, MM; Kato, Y; Fujinaga, K; Shin, KC; Shinjo, R

  PRECAMBRIAN RESEARCH ( Precambrian Research )  421   107750 - 107750   2025.06 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

  • Access this article

    DOI

• Coral Decline Linked to Exchangeable Phosphate in Seawater from Coastal Calcareous Sediments, as Evidenced in Sekisei Lagoon, Japan

  Yasumoto, J; Iijima, M; Iguchi, A; Nakamura, T; Takada, R; Yasumoto-Hirose, M; Iwasaki, Y; Yasutaka, T; Mori-Yasumoto, K; Shinjo, R; Ide, R; Yamazaki, A; Mizusawa, N; Ohno, Y; Suzuki, A; Watabe, S; Yasumoto, K

  MARINE BIOTECHNOLOGY ( Marine Biotechnology )  27 ( 2 ) 50   2025.04 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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    PubMed

• Geochemistry of late Miocene-Pleistocene basalts from a coastal area of Vietnam: Implication for small-scale mantle heterogeneities

  Nguyen Hoang, Tran Thi Huong, Ryuichi Shinjo, Le Duc Anh, Le Duc Luong, Phan Dong Pha

  Journal of Asian Earth Sciences ( Elsevier BV )  281   106488 - 106488   2025.03 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

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    DOI

• Discovery of a Pumice Deposit from the 1924 Iriomote Submarine Volcanic Eruption on the Northeastern Coast of Ishigaki Island

  Usami, K., Kato, Y., Shinjo, R., Niiyama, S.

  Bull. Mus., Okinawa Pref. Mus. Art Mus.   ( 18 ) 1 - 8   2025.03

  Type of publication: Research paper (bulletin of university, research institution)

• Pleistocene basaltic volcanism in the southeastern Ailao Shan - Red River Shear zone: Implications for the injection of metasomatized asthenospheric mantle under the region

  Hoang Nguyen, Ryuichi Shinjo, Luong Le Duc, Huong Tran Thi, Anh Tran Viet, Pha Phan Dong, Dang Pham Thanh, Thang Cu Sy, Thu Nguyen Thi, Dung Le Thi Phuong

  Vietnam Journal of Earth Sciences ( Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) )  47   16 - 43   2024.09 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

  　View Summary

  The Lung Po basalt, dating to 0.93, 0.81, and 0.47 Ma, occupies approximately 1 km² and is situated 12 km west of the Ailao Shan Red River Shear Zone (ASRRSZ) and about 65 km south of the 12-0 Ma Maguan intraplate volcanic area in southwest Yunnan (SW China), within the ASRRSZ. This olivine-bearing phyric alkaline basalt is characterized by high TiO₂ (around 2.3 wt.%), MgO (8-10 wt.%), and K₂O (approximately 2.8-3 wt.%) with Na₂O/K₂O ratios ranging from 1 to 1.2. These features partially overlap with the Maguan mantle xenolith-bearing alkaline basalt but are distinct from the Pleistocene alkaline basalt of Vietnam's Western Highlands. The Lung Po basalts exhibit a typical oceanic island basalt (OIB) trace element distribution pattern and a 'crossing' rare earth element (REE) pattern, indicating magma generation possibly by melting of garnet peridotite. They have high ⁸⁷Sr/⁸⁶Sr isotopic ratios (around 0.706) and low ¹⁴³Nd/¹⁴⁴Nd ratios (approximately 0.5126), along with moderate ²⁰⁶Pb/²⁰⁴Pb and ¹⁷⁶Hf/¹⁷⁷Hf isotopic ratios (respectively <18.3-18.4 and 0.28295-0.2830). These isotopic characteristics, coupled with OIB trace element features, challenge the involvement of crustal material. The Lung Po Pleistocene basalt and the 12-0 Ma Maguan alkaline basalt differ significantly from the 42-24 Ma post-collision high-K magmas in the ASRRSZ, which are associated with crustal tectonic processes. Instead, the Lung Po (and Maguan) basalt likely originated from a newly emplaced, metasomatically altered fertile asthenosphere following localized lithosphere extension and delamination after the India-Eurasian collision events.

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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)

• 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.

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SDGs 【 display / non-display 】

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Social Activity 【 display / non-display 】

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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