研究者詳細 - 新城　竜一

論文 - 新城　竜一

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Mixed carbonate-siliceous hydrothermal chimneys ahead of the Asal propagating rift (SE Afar Rift, Republic of Djibouti)

Moussa N.

Journal of African Earth Sciences ( Journal of African Earth Sciences ) 197 104765 - 104765 2023年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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The geochemical gas field in surface sediments in the Southwest sub-basin of East Vietnam Sea: distribution, origin, and comparative features with other regions of Western East Vietnam Sea

Duc Luong Le, Hoang Nguyen, Anatoly Obzhirov, Ryuichi Shinjo, Renat B. Shakirov

Vietnam Journal of Marine Science and Technology ( Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ) 22 ( 4 ) 337 - 362 2022年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

We analyzed 39 gas samples, including carbon dioxide, hydrocarbon gases C1–C4, hydrogen, and helium, in surface sediment from 19 gravity cores collected from the SW sub-basin of the East Vietnam Sea (EVS) using the headspace and vacuum degassing methods. Based on the result, we discussed the distribution and origin of gases in the southwest sub-basin EVS surface sediments. The sediments are mostly clay and silty clay containing methane ranging from 0.5–440 ppm. The anomalous concentrations of methane, helium, and hydrogen occur along the continental slope in the Nam Con Son basin of Southwest EVS. Methane is the dominant gas compared to other detected hydrocarbon gases, including ethylene, propane, and butane. Based on comparative results, the background methane concentrations in surface sediments decrease from South to North, from the southwestern sub-basin of the East Vietnam Sea to the Phu Khanh and the Red river basins. We propose the presence of a large-scale degassing zone of hydrocarbon gases and discuss the gases’ origin in surface sediments based on hydrocarbon gas ratios, carbon isotope compositions of carbon dioxide and methane, and the relationship between geochemical characteristics of surface sediments and fault system, and surface sediment gases.

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Redox evolution of differentiating hydrous basaltic magmas recorded by zircon and apatites in mafic cumulates: The case of the Malayer Plutonic Complex, Western Iran

Deevsalar R.

Geochemistry ( Geochemistry ) 83 ( 1 ) 125946 - 125946 2022年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Development and Application of an Environmental Education Tool (Board Game) for Teaching Integrated Resource Management of the Water Cycle on Coral Reef Islands

Shimabukuro M.

Sustainability (Switzerland) ( Sustainability (Switzerland) ) 14 ( 24 ) 16562 - 16562 2022年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

To solve resource issues on coral reef islands, an understanding of the water cycle is essential. Water resource management is intricately linked to diverse occupational industries and coral reef ecosystems on these islands. To effectively promote sustainable natural resource management, we developed a board game as an environmental education and communication tool for school students and people of all ages. The concept of the game is that “clean water will always be available if it is used properly”. The board game was designed based on an island with an underground freshwater lens as its main water resource. Role-playing was used to enhance islander livelihoods such as with vegetable and livestock farming, fishing, and tourism. Players, while working collaboratively, have to use the island’s groundwater adequately and conserve it for future generations. The game was developed through a transdisciplinary process in collaboration with scientists, administrative officers, civic groups, and students. Additionally, the board game was tested in diverse communities. In this study, we elaborated on the board game after it was played by students at an elementary school on Tarama Island. We observed that participants learned that cooperation is important for the sustainable use of water resources. Moreover, the participants proposed two methods for cooperation: joint discussion and ‘assembly decisions’. The board game has the potential to be used as an effective environmental education tool to promote sustainable water resource management on coral reef islands.

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鉛同位体比による近世〜近代日本で流通した銃弾鉛の原産地推定

相澤正隆, 溝田智俊, 細野高啓, 新城竜一

金属 92 ( 11 ) 62 - 78 2022年11月

掲載種別: 研究論文（その他学術会議資料等）

Sr isotopic ratios of hydrothermal fluids from the Okinawa Trough and the implications of variation in fluid–sediment interactions

Toki, T, Nohara, T, Urata, Y, Shinjo, R, Hokakubo-Watanabe, S, Ishibashi, J, Kawagucci, S

Progress in Earth and Planetary Science ( Progress in Earth and Planetary Science ) 9 ( 59 ) 2022年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Abstract Sr isotope ratios of hydrothermal fluids were observed at five sediment-associated sites in the Okinawa Trough to investigate the diversity of subseafloor fluid–rock–sediment interactions. The estimated 87Sr/86Sr ratios of the hydrothermal endmember fluids at the five sites were all higher than those at the sediment-starved sites. The endmember Sr isotopic ratios of hydrothermal fluids were diverse within the Okinawa Trough, ranging from 0.7077 at the Iheya North Knoll site to 0.712 at the Yonaguni Knoll IV site. To our knowledge, 0.712 is the highest value reported to date for seafloor hydrothermal fluids. This variation is likely attributable to the relative contributions of multiple subseafloor Sr reservoirs, which are 87Sr-poor volcanic rock and 87Sr-rich hemipelagic sediments containing clay minerals of terrestrial origin. These data support a model based on the carbon isotope ratio of CH4, which indicates whether volcanic rocks or terrestrial sediments are distributed in the high-temperature reaction zone of the hydrothermal system.

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Geochemical and geochronological constraints on origin of the Sawlava ophiolite (NW Iran): Evidence for oceanic mantle evolution beneath Iran-Iraq border

Ghorbani M.R.

Lithos ( Lithos ) 418-419 106695 - 106695 2022年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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福徳岡ノ場2021年8月噴火による沖縄県における漂着軽石の記録

宇佐美賢, 新城竜一

沖縄県立博物館・美術館, 博物館紀要 ( 15 ) 1 - 16 2022年03月

掲載種別: 研究論文（大学，研究機関紀要）

THE ORIGIN OF GEM SPODUMENE IN THE HAMADAN PEGMATITE, ALVAND PLUTONIC COMPLEX, WESTERN IRAN

Gheshlaghi, RS; Ghorbani, M; Sepahi, AA; Deevsalar, R; Nakashima, K; Shinjo, R

CANADIAN MINERALOGIST ( Canadian Mineralogist ) 60 ( 2 ) 249 - 266 2022年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

ABSTRACT Pegmatite bodies with a simple mineral composition are widespread within the Sanandaj-Sirjan Zone (SaSiZ), Zagros Orogen, Iran; however, gem-bearing pegmatite bodies are rare. There is a pegmatitic vein within the Hamadan garnet (± andalusite ± staurolite) schist adjacent to the Alvand Plutonic Complex (APC), south of Hamedan city (western Iran), in which large crystals of gem spodumene occur together with quartz, amazonite, beryl, tourmaline, and apatite. This spodumene-bearing pegmatite consists of four major zones with slightly different mineral compositions from the border to the core. The wall zone of quartz-rich granitoid and the intermediate zone of alkali granite have trondhjemitic compositions near the quartzolitic gem-bearing core zone. All parts of the vein are peraluminous in composition and exhibit S-type affinity. Two types of spodumene which have been distinguished in the core zone are colorless to very pale yellow and pink, transparent with vitreous luster and inclusion-free (eye clean) under 10× magnification. The different color in these minerals can be attributed to the slightly different chemical compositions, particularly lower Fe/Mn ratios in the pink material. The δ7Li values of the spodumene (+5.58 to +6.57‰) are indicative of the incorporation of middle continental crustal components in their genesis. Change in the mineral assemblage from tourmaline-bearing in the intermediate zone to spodumene + tourmaline in the core zone of the spodumene-bearing pegmatite is consistent with increasing lithium content from the wall zone to the core. Petrographic, geochemical, and isotopic data indicate that partial melting of middle-crustal Al-rich metapelitic source was followed by fractional crystallization to generate these rocks. In this concern, the required Li for the crystallization of spodumene was probably supplied by the breakdown of staurolite of the Hamadan schist and/or subsequent fractional crystallization of the parent magma. The results also demonstrate that the regional tectonic regime exerts a primary control on the occurrence and emplacement of the miarolitic pegmatite in the upper crust and the formation of gem spodumene during late-stage magmatic activities.

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Lead isotopic characteristics of gun bullets prevailed during the 19th century in Japan: Constraints on the provenance of lead source from the United Kingdom and Japan

Aizawa M.

Journal of Archaeological Science: Reports ( Journal of Archaeological Science: Reports ) 41 103268 - 103268 2022年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Provenancing Nineteenth Century Saltpetre From British India Using Nitrogen, Oxygen, and Strontium Isotope Ratios

Chitoshi Mizota, Robin Hansen, Takahiro Hosono, Azusa Okumura, Ryuichi Shinjo, Masataka Aizawa

Collections: A Journal for Museum and Archives Professionals ( SAGE Publications ) 18 ( 2 ) 155019062110729 - 155019062110729 2022年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Highly purified specimen of saltpetre, kept in two glass jars are stored in the collections of the Natural History Museum, London, United Kingdom. Historic catalogs of the specimen collection record their acquisition date as 17th March, 1881. The specimen represent heritage of the saltpetre industry during the times of the colonial British India. Chemical analysis shows that they are highly refined, containing only traces of impurities. Dual isotopic composition (δ15N and δ18O) of nitrate implies their intrinsic origin as British India. In addition, relative to highly radiogenic signature of Sr widespread throughout India, less radiogenic strontium (87Sr/86Sr = 0.707859–0.714168) in the specimens suggests that final stages of the refining took place in western India where relevant waters containing pristine Sr were used. Stable isotope geochemistry in combination with history and socio-economy provide new insights into this research area which is not yet fully understood.

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Geochemistry and petrogenesis of intrusive rocks of Chadormalu deposit; an implication on whole-rock geochemistry and Sr-Nd-Pb isotopes

Nayebi, N, Esmaeily, D, Modabberi, S, Shinjo, R, Deevsalar, R, Lehmann, B

Scientific Quarterly Journal of Geosciences 32 29 - 42 2022年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Mantle geodynamics and source domain of the East Vietnam Sea opening- induced volcanism in Vietnam and neighboring regions

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

Vietnam Journal of Marine Science and Technology ( Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ) 21 ( 4 ) 393 - 417 2021年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

The spreading of the East Vietnam Sea (EVS, also known as Bien Dong, or the South China Sea), leading to the occurrence of syn-spreading (33-16 Ma) and post-spreading (< 16 to present) volcanism. Syn-spreading magma making up thick layers of tholeiitic basalt with a geochemical composition close to the refractory and depleted mid-ocean ridge basalt (MORB) is mainly distributed inside the EVS basin. The post-spreading magma is widely distributed inside the basin and extended to South and SE China, Hainan island, Southern Laos (Bolaven), Khorat Plateau (Thailand), and Vietnam, showing the typical intraplate geochemistry. Basaltic samples were collected at many places in Indochina countries, Vietnam’s coastal and continental shelf areas, to analyze for eruption age, petrographical, geochemical, and isotopic composition to understand the similarities and differences in the mantle sources between regions. The results reveal that basalts from some areas show geochemical features suggesting they were derived subsequently by spinel peridotite and garnet peridotite melting, forming high-Si, low-Mg, and low-Ti tholeiitic basalt to low-Si, high-Mg, and high-Ti alkaline basalt with the trace element enrichment increasing over time. Other basalts have geochemical and isotopic characteristics unchanged over a long period. The post-spreading basalt’s radiogenic Sr-Nd-Hf-Pb isotopic compositions show different regional basalts distribute in the various fields regardless of eruption age, suggesting that their mantle source feature is space-dependent. The post-EVS spreading basalts expose the regional heterogeneity, reflecting the mixture of at least three components, including a depleted mantle (DM) represented by the syn-EVS spreading source, similar to the DUPAL-bearing Indian MORB source; an enriched mantle type 1 (EM1), and type 2 (EM2). The DM may interact and acquire either EM1 or EM2 in the sub-continental lithospheric mantle; as a result, different eruption at different area acquires distinct isotopic signature, reflecting the heterogeneous nature of the subcontinental lithospheric mantle. The study proposes a suitable mantle dynamic model that explains the EVS spreading kinematics and induced volcanism following the India - Eurasian collision from the Eocene based on the research outcomes.

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Last glacial temperature reconstructions using coupled isotopic analyses of fossil snails and stalagmites from archaeological caves in Okinawa, Japan.

Asami R, Hondo R, Uemura R, Fujita M, Yamasaki S, Shen CC, Wu CC, Jiang X, Takayanagi H, Shinjo R, Kano A, Iryu Y

Scientific reports ( Scientific Reports ) 11 ( 1 ) 21922 2021年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Abstract We applied a new geoarchaeological method with two carbonate archives, which are fossil snails from Sakitari Cave and stalagmites from Gyokusen Cave, on Okinawa Island, Japan, to reconstruct surface air temperature changes over the northwestern Pacific since the last glacial period. Oxygen isotope ratios (δ18O) of modern and fossil freshwater snail shells were determined to infer seasonal temperature variations. The observational and analytical data confirm that δ18O values of fluid inclusion waters in the stalagmite can be regarded as those of spring waters at the sites where snails lived. Our results indicate that the annual mean, summer, and winter air temperatures were lower by 6–7 °C at ca. 23 thousand years ago (ka) and 4–5 °C at ca. 16–13 ka than those of the present day. Our reconstruction implies that surface air cooling was possibly two times greater than that of seawater around the Ryukyu Islands during the Last Glacial Maximum, which potentially enhanced the development of the East Asian summer monsoon during the last deglaciation. Considering the potential uncertainties in the temperature estimations, the climatic interpretations of this study are not necessarily definitive due to the limited number of samples. Nevertheless, our new geoarchaeological approach using coupled δ18O determinations of fossil snails and stalagmite fluid inclusion waters will be useful for reconstructing snapshots of seasonally resolved time series of air temperatures during the Quaternary.

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Chemical, mineralogical, and physicochemical features of surface saline muds from Southwestern sub-basin of the East Vietnam Sea: Implication for new peloids

Luong Le Duc, Hoang Nguyen, Ryuichi Shinjo, Renat B. Shakirov, Anatoly Obzhirov

Vietnam Journal of Earth Sciences ( Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ) 1 - 13 2021年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

This study presents the chemical, mineralogical and physicochemical features of 8 saline mud samples from 8 gravity cores located in the southwestern sub-basin of the East Vietnam Sea. The grain-size analysis of mud samples reveals the amount of clay and silt particles in the ranges of 65.1-89.2% and 9.5-34.2%, respectively and a very low fraction of sand. The analytical results showed that mud samples have high contents of SiO2 (32.79-48.09%), Al2O3 (11.26-13.63%), CaO (3.10-13.93%), Fe2O3 (4.15-9.45%), and low contents of TiO2, MnO, MgO, Na2O, K2O and P2O5. The XRD analysis of mud samples indicated mineral compositions with major minerals of quartz, illite, calcite, chlorite, feldspar, kaolinite, and other minor minerals like halite, smectite, fluorapatite, pyroxene, amphibole. The organic and physicochemical parameters of mud samples were also measured. Potentially toxic elements in mud samples were determined and compared with reference values and the technical standard. This study proposes that saline mud samples from the studied area are potential peloids.

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Reconstruction of ocean environment time series since the late nineteenth century using sclerosponge geochemistry in the northwestern subtropical Pacific

Asami R.

Progress in Earth and Planetary Science ( Progress in Earth and Planetary Science ) 8 ( 1 ) 2021年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

<title>Abstract</title>The geochemistry of calcifying marine organisms is an excellent proxy for reconstructing paleoceanographic history, but studies of hypercalcified demosponges (sclerosponges) are considerably fewer than those of corals, foraminifers, and bivalves. For this study, we first generated near-annual resolved stable carbon and oxygen isotope (δ13C and δ18O) and element/Ca ratios (Sr/Ca, Ba/Ca, Pb/Ca, U/Ca) time series for 1880–2015 from sclerosponge samples (<italic>Acanthochaetetes wellsi</italic>) collected at Miyako Island and Okinawa Island in the Ryukyu Islands of southwestern Japan. The δ13C records exhibited a typical variation of anthropogenically derived Suess effects, demonstrating that the rates of decrease of –0.0043‰/year before 1960 and – 0.024‰/year after 1960 in the northwestern subtropical Pacific were respectively similar to and about 1.4 times higher than those of the Caribbean Sea in the tropical Atlantic. Spectral analysis of the δ18O time series revealed significant periodicity of approximately 2, 3, 6.5, 7–10, and 20–30 year/cycle, indicating that sea surface conditions in the southern Ryukyu Islands had been dominated by interannual and decadal variations in temperature and seawater δ18O since the late nineteenth century. The Sr/Ca and U/Ca ratios for the species <italic>A. wellsi</italic> (high-Mg calcite) might not be a robust proxy for seawater temperatures, unlike <italic>Astrosclera willeyana</italic> and <italic>Ceratoporella nicholsoni</italic> sclerosponges (aragonite). An evident increasing Pb/Ca trend after 1950 found in the samples is probably attributable to Pb emissions from industrial activities and atmospheric aerosols in eastern Asian countries. The Ba/Ca variations differ greatly among sampling sites, which might be attributable to the respective local environments. This evidence demonstrates that more high-resolution age determinations and geochemical profilings enable delineation of secular variations in ocean environments on annual and interannual timescales. Results of our study suggest that if sclerosponges living in deeper ocean environments are collected, spatial and vertical oceanographic variations for the last several centuries will be reconstructed along with coral proxy records.

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Dynamical spatial model of heavy metals in Kendari bay using Bayesian geographical weighted regression

Mukhsar

Journal of Physics: Conference Series ( Journal of Physics: Conference Series ) 1899 ( 1 ) 2021年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Geochemical evidence for “cryptic amphibole fractionation” and lower crust melting for the generation of island arc tholeiitic rocks from northern Fossa Magna, central Japan

Aizawa M.

Lithos ( Lithos ) 386-387 106028 - 106028 2021年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Shimajiri Group equivalent sedimentary rocks dredged from sea knolls off Kume Island, central Ryukyus: Implications for timing and mode of rifting of the middle Okinawa Trough back-arc basin

Kikunaga R.

Island Arc ( Island Arc ) 30 ( 1 ) 2021年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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隠岐諸島に産する後期新生代火山岩類の起源マントルの地球化学的変遷

相澤正隆, 新城竜一, 岡村聡, 平井康裕

日本地質学会学術大会講演要旨 ( 一般社団法人日本地質学会 ) 2021 ( 0 ) 059 2021年

掲載種別: 研究論文（研究会，シンポジウム資料等）

はじめに隠岐諸島には，漸新世～更新世の火山岩類と堆積岩類が分布する。隠岐諸島の後期新生代の火山活動は，中期中新世以前は非アルカリ岩の活動が中心で，後期中新世以降はアルカリ岩の活動が中心となる[1]。本研究では，隠岐諸島に分布する後期漸新世以降の火山岩類について岩石学的検討を行い，日本海拡大の直前に活動していた火山岩の起源マントル，日本海拡大を引き起こしたアセノスフェアマントル，および日本海拡大後のアルカリ岩類の起源マントルの地球化学的組成の時間変化について考察した。全岩化学組成時張山［ときばりやま］層（26.0～18.1 Ma）は安山岩質の火砕岩と溶岩，郡［こおり］層（19.2～13.7 Ma）は玄武岩質の溶岩と火砕岩からなる。これらの火山岩はいずれも島後に分布し，非アルカリ岩とアルカリ岩の境界付近の組成を有する。不適合元素パターンは，E-MORBに類似したやや肥沃的な組成で，Nb-Taに負異常を持ち，高いLILE/HFSEを示す沈み込み帯火山岩の特徴を示す。Sr-Nd-Pb-Hf同位体組成は，第四紀の東北日本弧火山フロントの最も南部の火山グループ[2]の組成と一致する。重栖［おもす］層と葛尾［つづらお］層（5.7～5.0 Ma）は島後に広く分布し，主に粗面岩～アルカリ流紋岩の溶岩からなり，島後の西部ではショショナイト（5.5～5.1 Ma）がシート状に郡層中に貫入している。また，島前火山の外輪山上部溶岩（5.8～5.6 Ma）は，島前に広く分布し，主に粗面安山岩～粗面岩の溶岩からなる。これらの酸性岩類はいずれも，OIBに類似した肥沃な不適合元素組成を示し，ショショナイトを除き，Ba，Sr，Euに顕著な負異常がみられる。ショショナイトは，Nb-Ta，Zr-HfおよびSrに弱い負異常が認められる。これらのアルカリ酸性岩類の同位体組成は，下部地殻起源と考えられる隠岐島後の苦鉄質捕獲岩[3]の組成に近い。同時期の島前には，アルカリ玄武岩質の外輪山下部溶岩（6.3～5.8 Ma）が分布する。また，島前の宇受賀［うずか］玄武岩（2.9 Ma）は，スピネルレルゾライトを捕獲する島後のアルカリ玄武岩（4.7～0.42 Ma）と同時期のアルカリ玄武岩の活動である。これらのアルカリ玄武岩はいずれも，OIBに類似した極めて肥沃的な組成で滑らかな不適合元素パターンを示し，大和海盆の玄武岩とEM-Iの中間的な同位体組成を示す。なお，スピネルレルゾライトの捕獲岩は，日本海の海底玄武岩の同位体組成[4など]と類似する。（年代値は浦郷図幅[5]，西郷図幅[1]より引用）考察アルカリ玄武岩は，一部に未分化玄武岩を含み，数％以下のかんらん石の逆分別により，初生メルト組成を求めることができる。初生メルトの温度とマグマ分離深度は1290-1380℃，1.8-2.6 GPaと見積もられ，スピネルレルゾライトの高圧側のリキダス温度に近い。隠岐島後のレルゾライト捕獲岩の同位体組成は，時張山層・郡層火山岩の組成とは明らかに異なる。つまりこれらのかんらん岩は，阿部ら[6]の主張する日本海拡大期に噴出した玄武岩の残存固相である可能性がある。このレルゾライトはスピネル相の安定領域を示すことから，日本海拡大を引き起こしたアセノスフェアマントルは，アルカリ玄武岩の起源マントル（EM-I）の直上に分布していると推定される。隠岐諸島の火山活動は，7-5 Ma頃にアルカリ岩系列の玄武岩と酸性岩のバイモーダルな火山活動が生じている。この時期のアルカリ酸性岩類は，玄武岩質マグマによる下部地殻の部分融解，あるいは混染作用により生成されたと考えられており[7など]，本研究による微量元素・同位体組成の特徴もこの見解を支持する。以上を総合的に解釈すると，隠岐諸島の周辺では少なくとも18 Ma頃までは古い大陸下リソスフェアマントルに由来する沈み込み帯マグマが生成され，15 Ma頃までに日本海拡大を引き起こしたアセノスフェアマントルが流入し，7 Ma頃には，さらにその下位から肥沃的なマントル（EM-I）が流入してきたと考えられる。※本研究は，2019年度，2020年度隠岐ジオパーク研究助成を受けた。引用文献[1]鈴木ほか, 2009, 5万分の1西郷図幅，[2]Kimura and Yoshida, 2006, J.Petrol.，[3]Moriyama, 2006, 岡山大博論，[4]Hirahara et al., 2015, G3，[5]千葉ほか, 2000, 5万分の1浦郷図幅，[6]Abe et al., 2003, Island Arc，[7]小林ほか, 2002, 岩鉱

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