2022/07/02 更新

写真a

タグチ トモキ
田口 知樹
所属
教育・総合科学学術院 教育学部
職名
講師(専任)

学歴

  • 2013年04月
    -
    2016年03月

    名古屋大学   大学院環境学研究科   博士後期課程  

  • 2011年04月
    -
    2013年03月

    名古屋大学   大学院環境学研究科   博士前期課程  

  • 2007年04月
    -
    2011年03月

    静岡大学   理学部   地球科学科  

学位

  • 2016年03月   名古屋大学   博士(理学)

経歴

  • 2020年04月
    -
    継続中

    早稲田大学   教育・総合科学学術院 理学科 地球科学専修   専任講師

  • 2017年04月
    -
    2020年03月

    京都大学   大学院理学研究科   日本学術振興会特別研究員PD

  • 2016年04月
    -
    2017年03月

    名古屋大学   宇宙地球環境研究所   日本学術振興会特別研究員PD

  • 2015年04月
    -
    2016年03月

    名古屋大学   大学院環境学研究科   日本学術振興会特別研究員DC2

所属学協会

  •  
     
     

    日本地質学会

  •  
     
     

    日本鉱物科学会

  •  
     
     

    日本地球惑星科学連合

  •  
     
     

    American Geophysical Union

 

研究分野

  • 固体地球科学

研究キーワード

  • 鉱物学

  • ラマン分光学

  • 岩石学

  • 変成岩

論文

  • Raman geobarometry of quartz inclusions in kyanite: application to quartz eclogite from the Gongen area of the Sanbagawa belt, southwest Japan.

    Yuki Tomioka, Yui Kouketsu, Tomoki Taguchi

    The Canadian Mineralogist    2022年  [査読有り]

  • Formation process of Al-rich calcium amphibole in quartz-bearing eclogites from the Sulu belt, China

    Masaki Enami, Tomoki Taguchi, Yui Kouketsu, Katsuyoshi Michibayashi, Tadao Nishiyama

    American Mineralogist    2022年  [査読有り]

    DOI

  • Hidden intact coesite in deeply subducted rocks

    Tomoki Taguchi, Yui Kouketsu, Yohei Igami, Tomoyuki Kobayashi, Akira Miyake

    Earth and Planetary Science Letters   558   116763 - 116763  2021年03月  [査読有り]

    担当区分:筆頭著者, 責任著者

     概要を見る

    The stabilization of coesite is a diagnostic indicator of ultrahigh-pressure metamorphism and in many cases it implies that a rock has been subducted to a minimum depth of 80 km. Coesite typically occurs as rare relicts in rigid host minerals, but most commonly transforms into α-quartz pseudomorphs during exhumation. The abundance of coesite-bearing rocks in orogens worldwide is a contentious issue in the petrological community, despite evidence from numerical modeling that suggests that coesite formation should be a common geological process during ultrahigh-pressure metamorphism. This knowledge gap must be addressed to improve the understanding of the geological aspects of subduction-zone geodynamics. Here we report that minuscule coesites (<20 μm) occur as abundant inclusions in garnet-rich layers from the Italian Western Alps. The discovery of such intact inclusions may fill the gaps in the predicted and observed abundances of coesite worldwide. Through integrated approaches with resolutions down to the nano-scale, we show that these garnet-hosted inclusions are composed entirely of coesite. Our results suggest that common coesite-derived quartz pseudomorphs are less typical structures in ultrahigh-pressure metamorphic rocks and the minuscule coesite in many rocks may be overlooked because of its size. These findings open up new research directions for constraining the extent of deeply subducted rocks and their rheology.

    DOI

  • Thermal structure in subducted units from continental Moho depths in a paleo subduction zone, the Asemigawa region of the Sanbagawa metamorphic belt, SW Japan

    Yui Kouketsu, Kazushi Sadamoto, Hayato Umeda, Hirokazu Kawahara, Takayoshi Nagaya, Tomoki Taguchi, Hiroshi Mori, Simon Wallis, Enami Masaki

    Journal of Metamorphic Geology    2020年12月  [査読有り]

     概要を見る

    Raman CM geothermometry applied to 126 samples of pelitic schists collected over an area of 11 km x 7 km reveals the thermal structure of the Asemigawa region of the Sanbagawa metamorphic belt, southwest Japan in unprecedented detail. In general, the estimated temperatures gradually increase from south to north in the range of 288-553 degrees C. However, a temperature gap from similar to 380 to similar to 440 degrees C is identified near the boundary between the chlorite and garnet zones. This temperature region matches the depth of the continental Moho of the Sanbagawa subduction zone. The temperature gradient in the higher-temperature domain is higher than that in the lower-temperature domain, and large-scale tight folds that affect the thermal structure are developed in the high-grade units and in the vicinity of the temperature discontinuity. These geological structures probably reflect that the exhumed slab units was dammed at the Moho depth due to the upward movement being impeded by increase in the coupling strength of the overlying rocks associated with exhumation from beneath serpentinite rocks to a shallower domain overlain by crustal rocks. Changes in the coupling strength along the subduction boundary led the strong folding at the higher-temperature domain and the pre-formed foliation developed at the Moho depth may have acted as the tectonic boundary, resulting in a temperature discontinuity. These results will contribute to elucidating various geological phenomena occurring in the forearc regions of modern subduction zones.

    DOI

  • Early Carboniferous HP metamorphism in the Hida Gaien Belt, Japan: Implications for the Paleozoic tectonic history of proto‐Japan

    Takumi Yoshida, Tomoki Taguchi, Hayato Ueda, Kenji Horie, M. Satish‐Kumar

    Journal of Metamorphic Geology    2020年08月  [査読有り]

    DOI

  • Drastic effect of shearing on graphite microtexture: attention and application to Earth science

    Yui Kouketsu, Akira Miyake, Yohei Igami, Tomoki Taguchi, Hiroyuki Kagi, Masaki Enami

    Progress in Earth and Planetary Science   6 ( 1 )  2019年12月  [査読有り]

     概要を見る

    © 2019, The Author(s). The microtexture of graphite exposed on the polished surface was studied using confocal laser scanning microscopy, laser Raman spectroscopy, and focused ion beam–transmission electron microscopy (FIB–TEM) to elucidate the effect on surface condition and crystallinity of graphite by polishing process. The polished surface of the graphite was divided into a flat part with no irregularities and a grooved band with a width of < 1 μm and a depth of < 100 nm. Raman analyses revealed that the original structure of the graphite covered by the host mineral was a well-ordered graphite, whereas the polished graphite at the surface had a reduced crystallinity, particularly in the flat part of the sample. Based on scanning TEM observations of an ultra-thin FIB section, fractures that developed during sample preparation were concentrated in the region extending from the surface to a depth of 1 μm. Furthermore, graphite sheets were peeled away by shearing, with scraped graphite sheets filling in the gap. Our results demonstrate that the original microtexture of graphite was easily deformed by shearing during polishing, and careful attention should be paid to sample preparation. In addition, we also need to pay more attention to the effects of natural shearing such as faulting on the graphite or sheet-like minerals. [Figure not available: see fulltext.].

    DOI

  • A new occurrence of retrogressed eclogite from the Sanbagawa belt of southwest Japan and its significance

    Tomoki Taguchi, Shunsuke Endo, Yohei Igami, Akira Miyake

    ISLAND ARC   28 ( 5 ) e12317  2019年09月  [査読有り]

     概要を見る

    The present paper reports, for the first time, the occurrence of an omphacite-bearing mafic schist from the Asemi-gawa region of the Sanbagawa belt (southwest Japan). The mafic schist occurs as thin layers within pelitic schist of the albite-biotite zone. Omphacite in the mafic schist only occurs as inclusions in garnet, and albite is the major Na phase in the matrix, suggesting that the mafic schist represents highly retrogressed eclogite. Garnet grains in the sample show prograde-type compositional zoning with no textural or compositional break, and contain mineral inclusions of omphacite, quartz, glaucophane, barroisite/hornblende, epidote and titanite. In addition to the petrographic observations, Raman spectroscopy and focused ion beam system-transmission electron microscope analyses were used for identification of omphacite in the sample. The omphacite in the sample shows a strong Raman peak at 678 cm(-1), and concomitant Raman peaks are all consistent with those of the reference omphacite Raman spectrum. The selected area electron diffraction pattern of the omphacite is compatible with the common P2/n omphacite structure. Quartz inclusions in the mafic schist preserve high residual pressure values of Delta omega(1) > 8.5 cm(-1), corresponding to the eclogite facies conditions. The combination of Raman geothermobarometries and garnet-clinopyroxene geothermometry gives peak pressure-temperature (P-T) conditions of 1.7-2.0 GPa and 440-540 degrees C for the mafic schist. The peak P-T values are comparable to those of the schistose eclogitic rocks in other Sanbagawa eclogite units of Shikoku. These findings along with previous age constraints suggest that most of the Sanbagawa schistose eclogites and associated metasedimentary rocks share similar simple P-T histories along the Late Cretaceous subduction zone.

    DOI

  • Factors affecting preservation of coesite in ultrahigh-pressure metamorphic rocks: Insights from TEM observations of dislocations within kyanite

    Tomoki Taguchi, Yohei Igami, Akira Miyake, Masaki Enami

    Journal of Metamorphic Geology   37 ( 3 ) 401 - 414  2019年04月  [査読有り]

     概要を見る

    © 2019 John Wiley & Sons Ltd To understand the preservation of coesite inclusions in ultrahigh-pressure (UHP) metamorphic rocks, an integrated petrological, Raman spectroscopic and focussed ion beam (FIB) system–transmission electron microscope (TEM) study was performed on a UHP kyanite eclogite from the Sulu belt in eastern China. Coesite grains have been observed only as rare inclusions in kyanite from the outer segment of garnet and in the matrix. Raman mapping analysis shows that a coesite inclusion in kyanite from the garnet rim records an anisotropic residual stress and retains a maximum residual pressure of ~0.35 GPa. TEM observations show quartz is absent from the coesite inclusion–host kyanite grain boundaries. Numerous dislocations and sub-grain boundaries are present in the kyanite, but dislocations are not confirmed in the coesite. In particular, dislocations concentrate in the kyanite adjacent to the boundary with the coesite inclusion, and they form a dislocation concentration zone with a dislocation density of ~10 9  cm −2 . A high-resolution TEM image and a fast Fourier transform-filtered image reveal that a tiny dislocation in the dislocation concentration zone is composed of multiple edge dislocations. The estimated dislocation density in most of the kyanite away from the coesite inclusion–host kyanite grain boundaries is ~10 8  cm −2 , being lower than that in kyanite adjacent to the coesite. In the case of a coesite inclusion in a matrix kyanite, using Raman and TEM analyses, we could not identify any quartz at the grain boundaries. Dislocations are not observed in the coesite, but numerous dislocations and stacking faults are developed in the kyanite. The estimated overall dislocation density in the coesite-bearing matrix kyanite is ~10 8  cm −2 , but a high dislocation density region of ~10 9  cm −2 is also present near the coesite inclusion–host kyanite grain boundaries. Inclusion and matrix kyanite grains with no coesite have dislocation densities of ≤10 8  cm −2 . Dislocation density is generally reduced during an annealing process, but our results show that not all dislocations in the kyanite have recovered uniformly during exhumation of the UHP rocks. Hence, one of the key factors acting as a buffer to inhibit the coesite to quartz transformation is the mechanical interaction between the host and the inclusion that lead to the formation of dislocations in the kyanite. The kyanite acts as an excellent pressure container that can preserve coesite during the decompression of rocks from UHP conditions. The search for and study of inclusions in kyanite may be a more suitable approach for tracing the spatial distribution of UHP metamorphic rocks.

    DOI

  • Metamorphic record of the Asemi‐gawa eclogite unit in the Sanbagawa belt, southwest Japan: Constraints from inclusions study in garnet porphyroblasts

    Tomoki Taguchi, Masaki Enami, Yui Kouketsu

    Journal of Metamorphic Geology   37 ( 2 ) 181 - 201  2019年02月  [査読有り]

    DOI

  • 愛知県本宮山地域における領家変成岩中の十字石の産状を制御する化学的要因

    四坂 駿弥, 内藤 誉人, 杉浦 康彦, 稲石 匠, 田口 知樹, 三宅 明

    地質学雑誌   125 ( 4 ) 263 - 278  2019年  [査読有り]

     概要を見る

    <p>愛知県本宮山地域の領家変成帯の11地点の紅柱石を含む泥質変成岩およびメタチャート泥質部から十字石を見出した.十字石は,泥質変成岩では紅柱石や「雲母-石英集合体」の包有物として産するのに対して,メタチャート泥質部では「雲母-石英集合体」内の包有物のほかに,基質鉱物と接する斑状変晶としても産する.偏光顕微鏡による観察から,「雲母-石英集合体」は広域変成作用のプログレード期に仮像化した十字石を起源としていると解釈した.地域内の「雲母-石英集合体」の分布から,十字石は広く生成されたと考えられる.その後ピーク変成時までに,十字石が安定に存在した岩石と不安定になった岩石があった.十字石を含む鉱物組み合わせの岩石に対して,熱力学的計算による検討を行った.本研究地域の十字石の安定性の違いは(したがって産状の違いは),構成鉱物の化学組成の違い(特に黒雲母中のTiおよび十字石中のZn含有量)によって説明できる.</p>

    DOI CiNii

  • Significance of an amorphous SiO<inf>2</inf> phase in a pseudomorph after coesite enclosed in garnet from ultrahigh-pressure eclogite, Su–Lu Belt, eastern China

    Tomoki Taguchi, Akira Miyake, Masaki Enami, Yohei Igami

    Journal of Metamorphic Geology   36 ( 7 ) 843 - 854  2018年09月  [査読有り]

     概要を見る

    © 2018 John Wiley & Sons Ltd Here, we report the first discovery of an amorphous SiO2 phase (APSI phase) in a pseudomorph after coesite included in garnet from an ultrahigh-pressure (UHP) eclogite from the Su–Lu metamorphic belt, eastern China. Using transmission electron microscopy, Raman spectroscopy and selected area electron diffraction, we show that the internal structure of the pseudomorph consists of an APSI phase with nano/submicrocrystalline particles of quartz and a polycrystalline K-bearing fibrous sheet-silicate phase (KFSS phase). The APSI phase-bearing aggregates included in the garnet might have formed by reactions involving a supercritical fluid during exhumation by the following processes: (1) the development of radial cracks within the host garnet by the phase transition of coesite to quartz; (2) the decomposition of a part of the pseudomorph following infiltration of supercritical fluid; (3) the precipitation of the KFSS phase from the fluid phase during subsequent exhumation and cooling, which was likely promoted by a change in the metamorphic fluid from supercritical and/or subcritical to aqueous fluid; and (4) the rapid precipitation of the APSI phase under a metastable (non-equilibrium) state, such as quenching, during a later stage of the exhumation. Whether the APSI phase generally formed during exhumation and survived widely throughout the Su-Lu terrane is unknown. However, the presence of the APSI phase in a UHP eclogite provides new insight into the geodynamic phenomena occurring at continental collision zones.

    DOI

  • 愛知県段戸山地域の領家変成帯における含十字石泥質片岩の発見とその意義

    三宅 明, 五十嵐 夕香莉, 稲石 匠, 田口 知樹

    地質雑   123 ( 2 ) 59 - 72  2017年  [査読有り]

     概要を見る

    &lt;p&gt;愛知県段戸山地域の領家変成帯の泥質片岩から十字石を発見した.これらの泥質片岩には白雲母,黒雲母,石英,珪線石等の基質鉱物,紅柱石斑状変晶,および基質より粗粒な白雲母,黒雲母,石英から構成される扁平な形状の集合体(雲母-石英集合体)が含まれている.十字石は,紅柱石斑状変晶に包有されるものと,雲母-石英集合体内の石英や白雲母に包有されるものがある.偏光顕微鏡による詳細な観察から,紅柱石は十字石斑状変晶を消費しながら成長し,その過程で紅柱石から離れた十字石斑状変晶は,雲母-石英集合に置換され,紅柱石に接した十字石斑状変晶は紅柱石に置換されたと解釈した.段戸山地域や幡豆-本宮山地域の泥質岩に十字石が出現するのに対して,他地域の領家変成帯の同程度の変成度の泥質岩に十字石が見つからないのは,プログレード期の&lt;i&gt;P&lt;/i&gt;-&lt;i&gt;T&lt;/i&gt;経路がより低圧であったため,十字石が安定な&lt;i&gt;P&lt;/i&gt;-&lt;i&gt;T&lt;/i&gt;領域を通らなかったせいである可能性が高い.&lt;/p&gt;

    DOI CiNii

  • Prograde evolution of Sulu UHP metamorphic rock in Yangzhuang, Junan region, deduced by combined Raman and petrological studies

    T. Taguchi, M. Enami, Y. Kouketsu

    JOURNAL OF METAMORPHIC GEOLOGY   34 ( 7 ) 683 - 696  2016年09月  [査読有り]

     概要を見る

    The prograde metamorphic history of the Sulu ultrahigh-pressure metamorphic terrane has been revealed using Raman-based barometry of the SiO2 phases and other mineral inclusions in garnet porphyroblasts of a coesite eclogite from Yangzhuang, Junan region, eastern China. Garnet porphyroblasts have inner and outer segments with the boundary being marked by discontinuous changes in the grossular content. In the inner segment, the SiO2 phase inclusions are -quartz with no coesite or relict features such as radial cracks. The residual pressures retained by the quartz inclusions systematically increase from the crystal centre to the margin of the inner segment. The metamorphic conditions estimated by calculation from the residual pressure and conventional thermodynamic calculation range from 500 to 630 degrees C and 1.3 to 2.3GPa for the stage of the inner segment. Coesite and its pseudomorph occur as inclusions in the outer segment of the garnet and matrix omphacite. This occurrence of coesite is consistent with the pressure and temperature conditions of 660-725 degrees C and 3.1GPa estimated by conventional geothermobarometry. Our results suggest that the quartz inclusions in the inner segment were trapped by garnet under -quartz-stable conditions and survived phase transition to coesite at the peak metamorphic stage. The SiO2 phases and other inclusions in the garnet have retained evidence of the pre-eclogite prograde stage even during exhumation stage. The combined Raman spectroscopic and petrological approaches used here offers a powerful means for obtaining more robust constraints prograde stages involving garnet growth where different SiO2 phases are present as inclusions.

    DOI

  • 愛知県足助南東部地域における伊奈川花崗閃緑岩の広大な接触変成帯

    三宅 明, 蛭川 孝信, 佐藤 真希, 田口 知樹, 鈴木 和博, 仲井 豊

    地質雑   122 ( 5 ) 173 - 191  2016年  [査読有り]

     概要を見る

    愛知県足助南東部地域には領家変成岩類に巨大な伊奈川花崗閃緑岩体が貫入している.貫入部付近の伊奈川花崗閃緑岩のCHIMEモナズ石年代測定を実施したところ,以前に測定されていた別の地点の年代にほぼ一致し(83.3±1.3Ma),巨大な岩体はほぼ同時に固結したという解釈を支持する結果になった.伊奈川花崗閃緑岩体の南東側に分布する変成岩類を地質学的・岩石学的に調査した結果,(1)変成分帯の配列,(2)泥質岩中の紅柱石仮像中の柱状珪線石の出現分布,(3)ミグマタイトの分布,はいずれも伊奈川花崗閃緑岩に近いほど高温の変成作用を経験したことを示した.接触変成帯の水平幅は約8kmに達し,花崗岩からの垂直距離は約5kmに及ぶ.このような広大な接触変成帯が形成されたのは,伊奈川花崗閃緑岩体の熱容量が大きかったことに加えて,新期花崗岩類に関係するマグマ活動によって,中部地方領家帯における地温勾配が高くなっていたことが重要な要因であったと解釈した.

    DOI CiNii

  • ザクロ石の鉱物包有物から探る沈み込み帯の地殻・マントル相互作用

    田口 知樹

    「平成26年度深田研究助成」研究報告     7 - 13  2015年

    担当区分:筆頭著者, 責任著者

  • Coexistence of jadeite and quartz in garnet of the Sanbagawa metapelite from the Asemi-gawa region, central Shikoku, Japan

    Tomoki Taguchi, Masaki Enami

    JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES   109 ( 4 ) 169 - 176  2014年08月  [査読有り]

     概要を見る

    Coexistence of jadeite (Jd(92)) and quartz was newly found in an inner segment of a composite-zoned garnet from a metapelite in the southern albite-biotite zone of the Asemi-gawa region, Sanbagawa belt in central Shikoku, Japan. The assemblage of jadeite + quartz in garnet gives a minimum metamorphic pressure of 1.4-1.9 GPa at 500-700 degrees C, which was significantly higher than that previously proposed for epidote-amphibolite facies conditions in the albite-biotite zone. Garnet includes quartz retaining high residual pressure (Delta omega(1) values up to 11.7 cm(-1)), which is comparable to the residual pressure reported in eclogite and metapelite within the eclogite unit in central Shikoku. These results imply that (1) the inner segment of the composite-zoned garnet records prograde recrystallization under high-pressure blueschist to eclogite facies conditions and (2) at least a part of the southern albite-biotite zone of the Asemi-gawa region recrystallized under higher pressure conditions prior to the regional metamorphism from the greenschist to epidote-amphibolite facies that formed the regional thermal structure of the Sanbagawa belt of central Shikoku.

    DOI

  • Compositional zoning and inclusions of garnet in Sanbagawa metapelites from the Asemi-gawa route, central Shikoku, Japan

    Tomoki Taguchi, Masaki Enami

    JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES   109 ( 1 ) 1 - 12  2014年02月  [査読有り]

     概要を見る

    Compositional and textural characteristics of the zonal structure and inclusions of garnet in metapelites from areas of high-grade greenschist facies (garnet zone) to areas of epidote-amphibolite facies (albite-biotite and oligoclase biotite zones) located along the Asemi-gawa route were examined using EPMA and Raman spectroscopy to investigate evolution of the P-T history of Sanbagawa metamorphism. Garnet grains exhibit two types of compositional zoning patterns: bell-shaped and composite types with spessartine variation. Bell-shape zoning is characterized by a monotonous decrease in the spessartine component from the crystal core towards the margin. Almandine and pyrope components exhibit the opposite trend. The grossular content reaches a maximum at an intermediate position between the core and the rim, and then decreases towards the outermost rim. The composite-zoned garnet is divided into core and mantle parts and it exhibits discontinuous compositional variations according to the associated boundary, evidencing resorption of the core and overgrowth of the mantle during crystallization; implying a two-stage growth of garnet during the Sanbagawa metamorphism. Composite-zoned garnet is characteristically observed in metapelites from a part of the albite-biotite zone, and quartz grains included in its core retain a higher residual pressure than those in garnet from other mineral zones. Isolated paragonite crystal occurs particularly as an inclusion in the core part of this composite-zoned garnet. These data suggest that part of the Sanbagawa metamorphic rocks in the Asemi-gawa region recrystallized under higher-pressure conditions up to the eclogite facies, prior to regional metamorphism from the greenschist, to the epidote-amphibolite facies that formed the regional thermal structure of the Sanbagawa belt of central Shikoku.

    DOI

  • PETROGENESIS OF Cr-RICH CALC-SILICATE ROCKS FROM THE BANDIHALLI SUPRACRUSTAL BELT, ARCHEAN DHARWAR CRATON, INDIA

    Tomoki Taguchi, Madhusoodhan Satish-Kumar, Tomokazu Hokada, Mudlappa Jayananda

    CANADIAN MINERALOGIST   50 ( 3 ) 705 - 718  2012年06月  [査読有り]

     概要を見る

    Chromium-rich calc-silicate rocks in the Archaean Bandihalli supracrustal belt in the Dharwar Craton, India, show a characteristic mineral assemblage that includes euhedral and anhedral (resorbed) green garnet associated with chromite, in addition to diopside, quartz, clinozoisite and calcite. Two distinct types of green garnets and a brown variety were identified in the calc-silicate rocks. These garnets show complex chemical compositional variations that range between the endmembers of uvarovite, grossular, and spessartine. Chromite grains in the matrix are euhedral or subhedral, whereas inclusions in garnet are rounded or amoeboid in shape. The two textural varieties of chromite from Bandihalli are separated by a compositional gap. Furthermore, chromites from the study area have high Cr# (0.80-0.97) and low Mg# (0.01-0.04), which is similar to the chromite in serpentinites and are in contrast with chromite compositions reported from igneous rocks. Therefore, the chromite in the calc-silicate rocks may have been derived from serpentinized ultramafic rocks. Textural and compositional data presented here provide evidence for chemical changes of the primary chromite with increasing metamorphic grade, presumably associated with primary hydrothermal alteration that resulted in serpentinization and carbonation of the ultramafic protolith. Therefore, Cr-rich calc-silicate rocks can be considered as products of metamorphosed carbonated and serpentinized mafic or ultramafic igneous rocks.

    DOI

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受賞

  • JMPS 第1回学生論文賞

    2016年09月   日本鉱物科学会  

    受賞者: 田口 知樹

  • 第16回論文賞

    2015年09月   日本鉱物科学会  

    受賞者: 田口 知樹, 榎並 正樹

  • 2015年年会研究発表優秀賞

    2015年09月   日本鉱物科学会  

    受賞者: 田口 知樹

共同研究・競争的資金等の研究課題

  • 高圧ー超高圧変成岩に適用可能な新しいラマン地質圧力計の開発

    日本学術振興会  基盤研究(C)

    研究期間:

    2019年04月
    -
    2022年03月
     

    田口 知樹

  • 多相固体包有物のナノ組織解析:超高圧変成岩上昇期の流体挙動の解明に向けて

    日本学術振興会  特別研究員奨励費

    研究期間:

    2017年04月
    -
    2020年03月
     

    田口 知樹

  • 石英ラマン圧力計の超高圧変成岩への適用:変成履歴を残留圧力から読み解く

    日本学術振興会  特別研究員奨励費

    研究期間:

    2015年04月
    -
    2017年03月
     

    田口 知樹

  • ザクロ石の鉱物包有物から探る沈み込み帯の地殻・マントル 相互作用

    深田地質研究所  深田研究助成

    研究期間:

    2014年04月
    -
    2015年03月
     

    田口 知樹

特定課題研究

  • 副成分鉱物の残留圧力から読み解く変成履歴

    2021年  

     概要を見る

    変成鉱物内に取り込まれた包有物の残留圧力を用いて、天然変成岩の変成履歴解析が可能か検証した。本研究課題では、西南日本三波川帯および中国蘇魯帯のエクロジャイトの藍晶石およびルチルに着目した。藍晶石を対象としたラマン分析と数値計算モデルにより算出された変成圧力値は、先行研究の推定値と遜色ないものであった。一方、ルチルについてはラマン分析条件の設定など再考すべき点があるものの、ピークシフト量から残留圧力推定は可能であると示唆される。今後、ラマン分光分析装置による鉱物包有物測定の条件最適化に関する研究も推進する予定である。

  • ラマン分光学に基づく新たな地質温度圧力計の開発

    2020年  

     概要を見る

    本課題では、藍晶石内に存在するシリカ包有物の「残留圧力」に焦点を当て、ラマン分光学に基づく新たな地質圧力計の開発を目指した。天然の高圧変成岩を対象に、石英包有物のラマン分析を実施し、その残留圧力値から変成条件の制約を試みた。最新の数値計算モデルを用いて残留圧力値から推定した変成圧力条件は、先行研究の熱力学的解析によって見積もられたピーク変成条件と調和的であった。これまでに得られた成果をまとめて、当該分野の査読付き国際誌に投稿済みの状態にあり、全体としてはおおむね順調に研究が進展したと言える。

 

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