研究者詳細 - 新城　竜一

論文 - 新城　竜一

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北部フォッサマグナ周辺の新生代火成活動と背弧海盆テクトニクス

岡村聡, 稲葉充, 足立佳子, 新城竜一

地球科学 ( 地学団体研究会 ) 71 ( 2 ) 65 - 73 2017年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

北部フォッサマグナ周辺の新第三系玄武岩類について，同位体組成と微量元素組成を検討した結果，マグマの起源物質とマントルウェッジの熱構造が漸新世から鮮新世にかけて変化することが明らかとなった．前期中新世玄武岩は，一部の玄武岩（切明玄武岩）を除き，HFS 元素に富み低176 Hf/ 177 Hf 比，低143 Nd/ 144 Nd 比を示すエンリッチした組成からなり，大陸縁辺を構成していた大陸下リソスフェアマントル起源と考えられる．中期中新世～鮮新世玄武岩は，HFS 元素に乏しく高176 Hf/ 177 Hf 比，高143 Nd/ 144 Nd 比を示す枯渇した組成であり，中でも中期中新世玄武岩は，インド洋MORB に類似の最も枯渇した同位体組成を示す．これらの枯渇組成マグマは，背弧海盆である日本海の拡大をもたらしたMORB 様アセノスフェアマントル起源だったらしい．漸新世～前期中新世のエンリッチしたマグマは，湧昇してきたアセノスフェアマントルの加熱によって，リソスフェアマントルが部分溶融して造られたと考えられるが，同時期に活動した枯渇組成の切明玄武岩の存在は，北部フォッサマグナにおいて，中絶リフト軸部に沿ってアセノスフェアの部分溶融メルトが生じたことを示す．各時代の玄武岩質火山岩類の化学組成は，異なるマントル物質の部分溶融に加え，スラブ堆積物の脱水作用や部分溶融メルトの影響を受けている．漸新世～中期中新世玄武岩類は，スラブ堆積物の高温部分溶融メルトの汚染を受けており，後期中新世～鮮新世玄武岩類は，ジルコンを残存固相とする低温部分溶融メルトによって汚染されたことを示唆する．

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伊是名海穴における海底下鉱体周辺の熱水性成分の分布

土岐知弘, 大竹翼, 石橋純一郎, 松井洋平, 川口慎介, 加藤大和, 淵田茂司, 宮原玲奈, 堤映日, 中村峻介, 川喜田竜平, 宇座大貴, 上原力, 新城竜一, 野崎達生, 熊谷英憲, 前田玲奈

日本地球化学会年会要旨集 ( 一般社団法人日本地球化学会 ) 64 ( 0 ) 147 - 147 2017年

掲載種別: 研究論文（学術雑誌）

2016年11月16日～12月15日にかけて、SIP「海のジパング計画」の一環として沖縄トラフの伊是名海穴HAKUREIサイトにおいて、地球深部探査船「ちきゅう」を用いて海底熱水域を掘削した。掘削は、HAKUREIサイトの北部マウンドの頂上から、東側に約500 mの測線上において5本、またリファレンスサイトとしてマウンドから北西500 mほど離れた地点において1本を掘削した。採取したコアから、船上でヘッドスペースガス測定用および間隙水抽出用の試料を採取した。試料から抽出した間隙水について、船上でpH、アルカリ度、栄養塩および硫化水素濃度を、陸上で主成分および微量元素濃度、並びにホウ素同位体比を測定した。また、ガス測定用の試料については、船上で炭化水素および水素濃度を、陸上においてメタンの炭素同位体比を測定した。

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Fluid flow and water–rock interaction across the active Nankai Trough subduction zone forearc revealed by boron isotope geochemistry

Hüpers A.

Geochimica et Cosmochimica Acta ( Geochimica et Cosmochimica Acta ) 193 100 - 118 2016年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Compositional changes, dehydration reactions and fluid flow in subducted sediments influence seismogenesis and arc magmatism in subduction zones. To identify fluid flow and water-rock interaction processes in the western Nankai Trough subduction zone (SW Japan) we analyzed boron concentration and boron isotope composition (delta B-11) of pore fluids sampled across the subduction zone forearc from depths of up to similar to 922 m below seafloor during four Integrated Ocean Drilling Program (IODP) Expeditions. The major structural regimes that were sampled by coring include: (1) sedimentary inputs, (2) the frontal thrust zone, (3) the megasplay fault zone, and (4) the forearc basin. From mass balance consideration we find that consumption of boron (B) by ash alteration and desorption of B from the solid phase, mediated by organic matter degradation, produces a net decrease in B concentrations with depth down to similar to 120 mu M and variable (delta B-11) values in the range of similar to+20 parts per thousand and +49 parts per thousand. Interstitial water in sediments on the incoming oceanic plate are influenced by more efficient mobilization of exchangeable B from the solid phase due to higher temperatures and alteration of the oceanic crust that acts as a sink for B-10. At the tip of the megasplay fault zone, elevated B concentration and B isotopic composition suggest that underthrust coarse-grained slope sediments provide a pathway for fluids out of the upper(<2 km) accretionary prism. Silt and sand layers in the underthrust section of the downgoing plate favor fluid escape in seaward direction from depths equivalent to the temperature range of 60-150 degrees C. At both locations the (delta B-11) signature evolves during updip migration through re-adsorption. Mass balance considerations suggest a shallower fluid source depth compared to pore fluids sampled previously near the decollement zone along the central portion of the Nankai margin. (C) 2016 Elsevier Ltd. All rights reserved.

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Miocene-Pliocene mantle depletion event in the northern Fossa Magna, western NE Japan

Okamura S.

Journal of Geodynamics ( Journal of Geodynamics ) 97 42 - 61 2016年07月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

New isotopic and trace element data presented here imply a temporal change in magma sources and thermal conditions beneath the northern Fossa Magna of NE Japan from the Miocene to the Pliocene. Less radiogenic Hf-176/Hf-177 and Nd-143/Nd-144, high Zr/Hf, and little or no Hf anomaly characterize the Early Miocene volcanism in the northern Fossa Magna region. The mantle wedge consisted of chemically heterogeneous mantle source. Based on out isotope proxies, we propose that during the onset of subduction, influx of hot asthenospheric mantle provided sufficient heat to partially melt newly subducting sediment. Geochemical modeling demonstrates that slab-derived melt mixed with mantle wedge produces the observed isotopic and trace elemental characteristics. In the Middle Miocene, the injection of hot and depleted asthenospheric material replaced the mantle beneath the northern Fossa Magna region of NE Japan. This caused the isotopic signature of the rocks to change from enriched to depleted. Then, the mantle wedge was gradually cooled during the Middle Miocene to the Pliocene with back-arc opening ending in the Late Miocene. Slab surface temperatures were still high enough for sediments to melt but not too high (<similar to 780 degrees C) to lose zircon as a residual phase. The Late Miocene and Pliocene volcanism at the post stage of the back-arc opening is best explained by a partial melting of subducted metasediment saturated with trace quantities of zircon and rutile. (C) 2016 Elsevier Ltd. All rights reserved.

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Development of a New Method of Extraction of Interstitial Water from Low-Porosity Consolidated Sediments Recovered During Super-Deep Drilling Projects

Toki T.

Geostandards and Geoanalytical Research ( Geostandards and Geoanalytical Research ) 40 ( 2 ) 291 - 300 2016年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

During the Integrated Ocean Drilling Program (IODP) Expedition 338, several methods were tested for the extraction of interstitial water in consolidated, low-porosity deep-sea sediments from Site C0002 in the Kumano Basin. On the basis of those tests, we propose a modified ground rock interstitial normative determination (GRIND) method of extraction of interstitial water. In separate runs of the new method, sediment samples were ground in a ball mill with either ultrapure water or a solution of HNO3. The interstitial water was then extracted with a conventional squeezer. Sufficient solution was extracted by this method to analyse most major and a few minor components of interstitial water that were comparable to those previously reported for samples extracted by the conventional squeezing method. The new method requires much smaller amounts of sediment than that of the conventional method and will be useful for analysis of samples recovered during superdeep drilling programmes.

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Finite element method (FEM) groundwater inflow modeling associated with an unconfined aquifer into the open-pit coalmine of the Phulbari area, NW Bangladesh

Islam M.

Arabian Journal of Geosciences ( Arabian Journal of Geosciences ) 9 ( 5 ) 394 2016年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

This paper uses a two-dimensional finite element method (FEM) numerical modeling to predict groundwater inflow from an unconfined aquifer into the open-pit coalmine in the Phulbari area of northwest Bangladesh. The rock mass of the unconfined aquifer in the Phulbari coal deposit is highly porous and permeable. Interconnected pores within rock mass are the main paths for groundwater flow. Model assumes groundwater inflow rate through the rock mass associated with interconnected pores. Eleven stages of computation associated with variable overall pit slope angle (OPSA) 25 degrees, 26 degrees, 27 degrees, 28 degrees, 29 degrees, 30 degrees, 31 degrees, 32 degrees, 33 degrees, 34 degrees, and 35 degrees are presented here. Model reveals that the probable inflow rate from unconfined aquifer in the open-pit coalmine would be about 377.68, 364.93, 354.38, 340.20, 331.29, 326.36, 316.86, 315.36, 308.03, 302.86, and 298.00 m(3)/h with relevant slope angles of 25 degrees, 26 degrees, 27 degrees, 28 degrees, 29 degrees, 30 degrees, 31 degrees, 32 degrees, 33 degrees, 34 degrees, and 35 degrees, respectively. It is reasonable to emphasize that the computed inflow rate (m(3)/h) in the present numerical model would be effective through unit width of rock strata up to the pit depth of about 320 m in the Phulbari coal deposit. From the simulation results, it is thought that the open-pit coalmine in the Phulbari area would be an environmentally challenging issue because of regional unconfined mega-aquifer.

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The epilog of the western paleo-Pacific subduction: Inferred from spatial and temporal variations and geochemistry of the Late Cretaceous to Early Cenozoic silicic magmatism in coastal South China

Chen C.

Journal of Asian Earth Sciences ( Journal of Asian Earth Sciences ) 115 520 - 546 2016年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

The Late Cretaceous to Early Cenozoic magmatism in the South China coastal area produced some amounts of rhyolitic rocks in two phases, which may be used to unravel the geohistory of the epilog of the paleo-Pacific plate subduction system. Essence of the Phase I rocks is the high temperature rhyolite (A-type)-trachydacite association in north Fujian (95-91 Ma) that was coeval with regional A-type granites. They succeeded the vast rhyolite-dacite-andesite (RDA) associations and I-type granitoids (113.5-96 Ma) and preceded the silicic-dominating rhyolite/basalt bimodal suites or monolithologic rhyolite in Zhejiang (89-86 Ma). Phase II rocks include (a) the RDA association or rhyolite alone in some drifted continental fragments nearby (83-56 Ma) and (b) the following rift-basin related rhyolite-tra chyte/basalt bimodal suites in Guangdong and west Taiwan (56-38 Ma). The silicic volcanism, spatially changed from a NE-SW to the nearly E-W direction after 83 Ma, may reflect tectonic-driven eruptions occurred in the post-orogenic extensional (Phase I), resumed plate subducting (Phase Ha) and continental margin rifting (Phase IIb) stages. Rhyolitic rocks basically are shoshonitic to high-K calc-alkaline affinities while the Phase Ha RDA associations are mostly concentrated in the high-K to medium-K calc-alkaline series. All these rocks generally possess a continental arc character in tectonic discrimination diagrams, except shoshonitic rocks that have within-plate signatures. Based on the trace element and Nd-Pb isotope data, A-type rocks are suggested to have derived from mixing between trachydacitic (or syenitic) magmas and crustal melts of various sources under the high temperature condition (+/- metasomatism), and the succeeding silicic rocks are derivatives of the contaminated lithospheric mantle melts through crystal fractionation. On the other hand, Phase II silicic rocks are mainly the fractionation products of mafic magmas originated either from the lithospheric or the asthenospheric mantle. In reflection to such magmatotectonics with time, break-off of the subducted slab shortly before 113.5 Ma, change of the plate-moving direction between 86 and 83 Ma, and termination of plate movement probably at similar to 56 Ma signify the epilog of the paleo-Pacific plate. (c) 2015 Elsevier Ltd. All rights reserved.

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鳥海山、貞観噴火前後の噴出物の特徴の変化

高橋拓也, 伴雅雄, 大場司, 林信太郎, 新城竜一

日本鉱物科学会年会講演要旨集 ( 一般社団法人日本鉱物科学会 ) 2016 ( 0 ) 186 2016年

掲載種別: 研究論文（研究会，シンポジウム資料等）

鳥海火山は過去約60万年間、山体の成長と崩壊を繰り返してきた。最新の山体崩壊は紀元前466年に発生し、東鳥海カルデラが形成された。その後はカルデラ内で溶岩流出主体の活動が続いている。また、鳥海山は西暦869年の貞観地震の2年後に噴火（貞観噴火）しており、東北地方太平洋沖地震後、噴火が危ぶまれる火山の一つである。そこで、本研究では、貞観地震の前後における噴出率やマグマの特徴に変化がみられるかどうかを火山地質学・岩石学的に検討した。その結果、貞観噴火を境にして、噴出率が低下したこと、また苦鉄質マグマの組成が変化したことなどが判明した。

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ダンボールでしゅう曲を作る(監修)

新城竜一

理科教育ニュース 2016年11月28日発行 ( 995 ) 2016年

掲載種別: 研究論文（その他学術会議資料等）

Geochemical characteristics of hydrothermal fluids at Hatoma Knoll in the southern Okinawa Trough

Toki Tomohiro, Itoh Michihiro, Iwata Daigo, Ohshima Shogo, Shinjo Ryuichi, Ishibashi Jun-ichiro, Tsunogai Urumu, Takahata Naoto, Sano Yuji, Yamanaka Toshiro, Ijiri Akira, Okabe Nobuaki, Gamo Toshitaka, Muramatsu Yasuyuki, Ueno Yuichiro, Kawagucci Shinsuke, Takai Ken

ＧＥＯＣＨＥＭＩＣＡＬ　ＪＯＵＲＮＡＬ ( 一般社団法人日本地球化学会 ) 50 ( 6 ) 493 - 525 2016年

掲載種別: 研究論文（学術雑誌）

Chemical and isotopic compositions of hydrothermal fluids from Hatoma Knoll in the southern Okinawa Trough were investigated. The hydrothermal fluids were derived from a single pure hydrothermal fluid source, but they underwent phase separation beneath the seafloor prior to venting. Only vapor-like fluids vent at the Hatoma system, and the most active area is around the center of the crater, based on the location of the maximum temperature and the lowest Cl– concentrations. Compared with other hydrothermal systems in the world, at Hatoma the pH and alkalinity, as well as the B, NH4+, K, Li, CO2, and CH4 concentrations, were higher, and the Fe and Al concentrations were lower, suggesting that the characteristics of the Hatoma hydrothermal fluids are comparable to those of the other Okinawa Trough hydrothermal fluids. Helium isotope ratios were lower than those of sediment-starved hydrothermal systems, suggesting that 4He derived from the sediment is supplied to the hydrothermal fluids in Hatoma Knoll. The carbon isotope ratios of CO2 in the hydrothermal fluids indicate an influence of organic carbon decomposition. The carbon isotope ratios of CH4 in the hydrothermal fluids imply that most of the CH4 originated from microbial methane produced in a recharge zone of the hydrothermal system. Although sediment influences are a typical feature of Okinawan Trough hydrothermal fluids, the Hatoma hydrothermal system has the lowest carbon isotope ratios of CH4 among them, which suggests that Hatoma is the most highly influenced by the sediments in the recharge zone. Thus, the degree of the sediment influences has a variable in each hydrothermal field in the Okinawa Trough.

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琉球弧の地質とその成り立ち

新城竜一

ペドロジスト(日本ペドロジー学会誌) 60 47 - 54 2016年 [ 査読有り ]

掲載種別: 研究論文（その他学術会議資料等）

琉球弧の地質とその成り立ち

新城竜一

ペドロジスト ( 日本ペドロジー学会 ) 60 ( 1 ) 47 - 54 2016年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Response of Acropora digitifera to ocean acidification: constraints from δ11B, Sr, Mg and Ba compositions of aragonitic skeletons cultured under variable seawater pH

Tanaka, K, Holcomb, M, Takahashi, A, Kurihara, H, Asami, R, Shinjo, R, Sowa, K, Rankenburg, K, Watanabe, T, McCulloch, M

Coral Reef ( Coral Reefs ) 34 ( 4 ) 1139 - 1149 2015年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

The response of Acropora digitifera to ocean acidification is determined using geochemical proxy measurements of the skeletal composition of A. digitifera cultured under a range of pH levels. We show that the chemical composition (delta B-11, Sr/Ca, Mg/Ca, and Ba/Ca) of the coral skeletons can provide quantitative constraints on the effects of seawater pH on the pH in the calcification fluid (pH(CF)) and the mechanisms controlling the incorporation of trace elements into coral aragonite. With the decline of seawater pH, the skeletal delta B-11 value decreased, while the Sr/Ca ratio showed an increasing trend. The relationship between Mg/Ca and Ba/Ca versus seawater pH was not significant. Inter-colony variation of delta B-11 was insignificant, although inter-colony variation was observed for Ba/Ca. The decreasing trend of pH(CF) calculated from delta B-11 was from similar to 8.5, 8.4, and 8.3 for seawater pH of similar to 8.1, 7.8, and 7.4, respectively. Model calculations based on Sr/Ca and pH(CF) suggest that upregulation of pH(CF) occurs via exchange of H+ with Ca2+ with kinetic effects (Rayleigh fractionation), reducing Sr/Ca relative to inorganic deposition of aragonite from seawater. We show that it is possible to constrain the overall carbonate chemistry of the calcifying fluid with estimates of the carbonate saturation of the calcifying fluid (Omega (CF)) being derived from skeletal Sr/Ca and pH(CF) (from delta B-11). These estimates suggest that the aragonite saturation state of the calcifying fluid Omega (CF) is elevated by a factor of 5-10 relative to ambient seawater under all treatment conditions.

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沖縄トラフ海底熱水中のLi同位体比から導かれた海底下における固相側の情報について

土岐知弘, 平敷紗和子, 新城竜一, 石橋純一郎

日本地球化学会年会要旨集 ( 一般社団法人日本地球化学会 ) 62 ( 0 ) 4 2015年

掲載種別: 研究論文（研究会，シンポジウム資料等）

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δ11B, Sr, Mg and Ba in Acropora digitifera cultured under acidified seawater: Effects of seawater pH on trace element incorporation into coral aragonite

Tanaka, K, Holcomb M, Takahashi, A, Kurihara, H, Asami, R, Shinjo, R, Sowa, K, Rankenburg, K, Watanabe, T, McCulloch, M

Coral Reefs 2015年 [ 査読有り ]

掲載種別: 研究論文（その他学術会議資料等）

The geology of Okinawa-jima Island

Shinjo, R

Nature in the Ryukyu Archipelago: Coral Reefs, Biodiversity, and the Natural Environment 112 - 119 2015年

掲載種別: 研究論文（その他学術会議資料等）

Sr-Nd-Pb-Hf isotopic constraints on the diversity of magma sources beneath the Aden Ridge (central Gulf of Aden) and plume-ridge interaction

Shinjo R.

岩石礦物礦床學 ( 一般社団法人　日本鉱物科学会 ) 110 ( 3 ) 97 - 110 2015年

掲載種別: 研究論文（学術雑誌）

This paper presents new Sr–Nd–Pb–Hf isotopic compositions of tholeiitic basalts dredged along the Aden Ridge of the central Gulf of Aden (45.5°E–49°E). Two groups of basalts are identified based on their contrasting spatial distributions and geochemical signatures. Basalts dredged from east of 46.2°E (Group 1) are LREE–depleted but have relatively wide variations in 87Sr/86Sr (0.70278–0.70304) and 206Pb/204Pb (18.21–19.03) and limited 143Nd/144Nd (0.51301–0.51309) and 176Hf/177Hf ranges (0.283224–0.283276; εHf = 15.98–17.83), analogous to the geochemical signature of enriched to depleted normal mid–oceanic ridge basalts (N–MORB). In contrast, the basalts dredged between 45.6°E and 46.2°E (Group 2) are more enriched in incompatible elements [ocean island basalt (OIB)–like] but have little variation in 87Sr/86Sr (0.70323–0.70341), 206Pb/204Pb (19.33–19.49), and 143Nd/144Nd (0.51285–0.51292) and a wide variation in 176Hf/177Hf (0.283020–0.283155; εHf = 8.77–13.54). Isotopic and trace element variations can be attributed to the mixing of three types of mantle source: depleted MORB–type mantle (Component i), matrix mantle of the Afar plume (Component ii), and recycled oceanic crust (Component iii) occurring as blobs, streaks, or ribbons within the plume matrix. Mixing between Components i and ii would have produced Group 1 basalts, and Components ii and iii produced Group 2 basalts. Our data suggest that the Afar plume components were involved in magma genesis westward from 48°E in the Aden Ridge.

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Late Holocene coral reef environment recorded in Tridacnidae shells from archaeological sites in Okinawa-jima, subtropical southwestern Japan

Asami R, Konishi M, Tanaka K, Uemura R, Furukawa M, Shinjo R

Island Arc ( Island Arc ) 24 ( 1 ) 61 - 72 2015年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Seasonally resolved records of carbon and oxygen isotopic composition (δ18O) in fossil shells of giant clams (Tridacnidae) recovered from the Kogachibaru Shell Mound (26°26'N, 127°49'E) and the Second Aragusuku-Shichabaru Ruin (26°18'N, 127°46'E) in Okinawa-jima, southwestern Japan, were investigated to reconstruct subtropical coral reef environments of the past. The samples, mainly composed of aragonite shells with limited amounts of diagenetically-altered calcite cements, were selected for geochemical analyses. The radiocarbon dating of the samples for stable isotope analyses yields about 4000yr cal. BP for the Kogachibaru Shell Mound and about 1900-1700yr cal. BP for the Second Aragusuku-Shichabaru Ruin, respectively, that correspond to the early and middle Shell Mound periods in Okinawa-jima. These show good agreement with the respective ages inferred from excavation. The shell δ18O values roughly show seasonal variations, coincident with the occurrence of annual growth bands. Applying corrections for the effect of diagenetic alteration, the averages of annual, summer, and winter δ18O values of fossil shells were significantly lower (by 0.1-0.7‰) than those of aragonite theoretically precipitated in present-day coral reef water of Okinawa-jima. These results demonstrate that annual mean seawater temperature and salinity at the sites where the Tridacnida spp. lived were about 1-3°C higher and/or about 1-2 lower than at present. This variation cannot be fully explained by global climate change, sea level change, and topographic growth of coral reef. Therefore, it is likely that the giant clams lived in extremely small and/or closed coral-reef lagoons with less water circulation where seawater is highly susceptible to insolation-induced temperature increase and input of fresh water; the effect could be enhanced by the fisheries lifestyle that stonewalling would be constructed at shallow waters through the use of tidal variation during the early and middle Shell Mound period in Okinawa-jima.

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Improved method for seawater lithium isotopic ratio determination using MC-ICP-MS

新城竜一

Bulletin of the Society of Sea Water Science, Japan 69 326 - 331 2015年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Data report: Boron isotope ratios in interstitial waters from Sites C0021 and C0022

Toki, T, Higa, K, Shinjo, R

Proceedings of the Integrated Ocean Drilling Program 338 2015年 [ 査読有り ]

掲載種別: 研究論文（その他学術会議資料等）

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