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last update 2021.07.28

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希土類元素の地球化学

原著論文

  1. Tanaka, K., Ohta, A. and Kawabe, I. (2004) Experimental REE partitioning between calcite and aqueous solution at 25°C and 1 atm: Constraints on the incorporation of seawater REE into seamount-type limestones. Geochem. J. 38(1),19–32. [doi:10.2343/geochemj.38.19]*

  2. Ohta, A. and Kawabe, I. (2001) REE(III) adsorption onto Mn dioxide (δ-MnO2) and Fe oxyhydroxide: Ce(III) oxidation by (δ-MnO2). Geochim. Cosmochim. Acta 65(5), 695–703. [doi:10.1016/S0016-7037(00)00578-0]

  3. Ohta, A. and Kawabe, I. (2000) Theoretical study of tetrad effects observed in REE distribution coefficients between marine Fe-Mn deposit and deep seawater, and in REE(III)-carbonate complexation constants. Geochem. J. 34(6), 455–473. [doi:10.2343/geochemj.34.455]*
    (Errata: Ohta, A. and Kawabe, I. (2000) Theoretical study of tetrad effects observed in REE distribution coefficients between marine Fe-Mn deposit and deep seawater, and in REE(III)-carbonate complexation constants (vol 34, pg 455, 2000). Geochem. J. 35, 213. [PDF])

  4. Ohta, A. and Kawabe, I. (2000) Rare earth element partitioning between Fe oxyhydroxide precipitates and aqueous NaCl solutions doped with NaHCO3: Determinations of rare earth element complexation constants with carbonate ions. Geochem. J. 34(6), 439–454.[doi:10.2343/geochemj.34.439]*

  5. Ohta, A., Ishii, S., Sakakibara, M., Mizuno, A. and Kawabe, I. (1999) Systematic correlation of the Ce anomaly with the Co/(Ni+Cu) ratio and Y fractionation from Ho in distinct types of Pacific deep-sea nodules. Geochem. J. 33(6), 399–417. [doi:10.2343/geochemj.33.399]*

  6. Kawabe, I., Ohta, A. and Miura N. (1999) Distribution coefficients of REE between Fe oxyhydroxide precipitates and NaCl solutions affected by REE-carbonate complexation. Geochem. J. 33(3), 181–197.[doi:10.2343/geochemj.33.181]*

  7. Kawabe, I., Ohta, A., Ishii, S., Tokumura, M. and Miyauchi, K. (1999) REE partitioning between Fe-Mn oxyhydroxide precipitates and weakly acid NaCl solutions: Convex tetrad effect and fractionation of Y and Sc from heavy lanthanides. Geochem. J. 33(3), 167–179. [doi: 10.2343/geochemj.33.167]*

  8. Kawabe, I., Toriumi, T., Ohta, A. and Miura, N. (1998) Monoisotopic REE abundances in seawater and the origin of seawater tetrad effect. Geochem. J. 32(4), 213–229. [doi:10.2343/geochemj.32.213]*

2005年度日本地球化学会奨励賞受賞記念論文

  1. 太田充恒 (2006) 鉄水酸化物・マンガン酸化物と海水間の希土類元素の分配に関する実験的・理論的研究.地球化学 40(1), 13–30.[doi:10.14934/chikyukagaku.40.13]*

 

地球化学図

原著論文

  1. Ohta, A., Imai, N., Okai, T., Manaka, M., Kubota, R., Nakamura, A., and Tachibana, Y. (2021) Watershed analysis for geochemical mapping in Japan based on a hydrologic model – the concentrations of 53 elements and the dominant lithology in a drainage basin –. Geochem. J. 55(2), 59–88. [doi:10.2343/geochemj.2.0618]

  2. Ohta, A., Imai, N., Tachibana, Y. and Ikehara, K. (2021) Application of spatial distribution patterns of multi-elements in geochemical maps for provenance and transfer process of marine sediments in Kyushu, western Japan. Geological Society, London, Special Publications, 505, (in press). [doi: 10.1144/SP505-2019-87]

  3. 太田充恒・南 雅代 (2019) 多段階の堆積サイクルを経た堆積物・堆積岩における源岩の初期Sr同位体比の保持―淡路島の細粒河川堆積物を例に―. 地球化学, 53(2), 59–70. [doi:10.14934/chikyukagaku.53.59]

  4. Minami, M., Jomori, Y., Suzuki, K. and Ohta, A. (2017) Grain-size variations in 87Sr/86Sr and elemental concentrations of stream sediments in a granitic area: Fundamental study on 87Sr/86Sr spatial distribution mapping. Geochem. J. 51(6), 469–484.[doi:10.2343/geochemj.2.0478]

  5. Jomori, Y., Minami, M., Sakurai-Goto, A., and Ohta, A. (2017) Comparing the 87Sr/86Sr of the bulk and exchangeable fractions in stream sediments: Implications for 87Sr/86Sr mapping in provenance studies. Applied Geochem. 86, 70–83. [doi:10.1016/j.apgeochem.2017.09.004].

  6. Ohta, A., Imai, N., Tachibana, Y. and Ikehara, K. (2017) Statistical analysis of the spatial distribution of multi-elements in an island arc region: Complicating factors and transfer by water currents. Water 9(1), 37:1–26. [doi:10.3390/w9010037].

  7. 城森由佳・太田充恒・南 雅代 (2016) 秋吉石灰岩岩体が河川堆積物の元素濃度およびSr同位体比に与える影響. 地球化学 50(1), 11–27. [doi:10.14934/chikyukagaku.50.1]*

  8. Ohta, A., Imai, N., Terashima, S. and Tachibana, Y. (2015) The spatial distribution of multiple elements in the Kanto region of Japan: Transport of chalcophile elements from land to sea. J. Geochem. Explor. 154, 156–170.[doi:10.1016/j.gexplo.2014.11.016]

  9. Nakai, I., Furuya, S., Bong, W. S. K., Abe, Y., Osaka, K., Matsumoto, T., Itou, M., Ohta, A. and Ninomiya, T. (2014) Quantitative Analysis of Heavy Elements and Semi-quantitative Evaluation of Heavy Mineral Compositions of Sediments in Japan for Construction of A Forensic Soil Database Using Synchrotron Radiation X-ray Analyses. X-ray Spectroscopy, 43(1), 38–48. [doi:10.1002/xrs.2496]

  10. Ohta, A., Imai, N., Terashima, S., Tachibana, Y. and Ikehara, K. (2013) Regional spatial distribution of multiple elements in the surface sediments of the eastern Tsushima Strait (southwestern Sea of Japan). Applied Geochem. 37, 43–56. [doi:10.1016/j.apgeochem.2013.06.010]

  11. Jomori, Y., Minami, M., Ohta, A., Takeuchi, M. and Imai, N. (2013) Spatial distribution of 87Sr/86Sr ratios of stream sediments in Shikoku Island and the Kii Peninsula, Southwest Japan. Geochem. J., 47(3), 321–335. [doi:10.2343/geochemj.2.0248]*

  12. Ohta, A., Imai, N., Terashima, S., and Tachibana, Y. (2011) Regional geochemical mapping in eastern Japan including the nation's capital, Tokyo. Geochem.-Explor. Environ. Anal. 11(3), 211–223. [doi:10.1144/1467-7873/10-042]

  13. Ohta, A., Imai, N., Terashima, S., Tachibana, Y., Ikehara, K., Katayama, H. and Noda, A. (2010) Factors controlling regional spatial distribution of 53 elements in coastal sea sediments in northern Japan: Comparison of geochemical data derived from stream and marine sediments. Applied Geochem. 25(3), 357–376. [doi:10.1016/j.apgeochem.2009.12.003]

  14. Ohta, A., Imai, N., Terashima, S., Tachibana, Y., Ikehara, K., Okai, T., Ujiie-Mikoshiba, M., and Kubota, R. (2007) Elemental distribution of coastal sea and stream sediments in the island-arc region of Japan and mass transfer processes from terrestrial to marine environments. Applied Geochem. 22(12), 2872–2891. [doi:10.1016/j.apgeochem.2007.08.001] (Errata in Applied Geochem., 23, 950-954. http://dx.doi.org/10.1016/j.apgeochem.2008.01.003)

  15. Ohta, A., Imai, N., Terashima, S. and Tachibana, Y. (2005) Influence of surface geology and mineral deposits on the spatial distributions of elemental concentrations in the stream sediments of Hokkaido, Japan. J. Geochem. Explor. 86, 86–103. [doi:10.1016/j.gexplo.2005.04.002]

  16. Ohta, A., Imai, N., Terashima, S. and Tachibana, Y. (2005) Application of multi-element statistical analysis for regional geochemical mapping in Central Japan. Applied Geochem. 20(5), 1017–1037. [doi:10.1016/j.apgeochem.2004.12.005]

  17. 太田充恒・今井登・寺島茂・立花好子 (2004) 河川堆積物を用いた中国地方の地球化学図による元素濃度のバックグラウンド評価. 地球化学 38(4), 203–222. [doi:10.14934/chikyukagaku.38.203]*

  18. Ohta, A., Imai, N., Terashima, S., Tachibana, Y., Ikehara, K. and Nakajima, T. (2004) Geochemical mapping in Hokuriku, Japan: Influence of surface geology, mineral occurrences and mass movement from terrestrial to marine environments. Applied Geochem. 19(9), 1453–1469. [doi:10.1016/j.apgeochem.2004.01.026]

  19. 太田充恒・今井登・岡井貴司・遠藤秀典・石井武政・田口雄作・上岡晃・御子柴(氏家)真澄・寺島滋 (2003) 地球化学図を用いた仙台市周辺地域の元素挙動の解明と環境評価.地球科学 57(1/2), 61–72. [doi:10.15080/agcjchikyukagaku.57.1-2_61]*

  20. 太田充恒・今井登・岡井貴司・遠藤秀典・川辺禎久・石井武政・田口雄作・上岡晃 (2002) 山形市周辺地域における元素分布の特徴について–山形盆地南部地域の地球化学図–. 地球化学 36(3), 109–125. [doi:10.14934/chikyukagaku.36.109]*

  21. 山本鋼志・田中剛・川邊岩夫・岩森光・平原靖大・浅原良浩・金奎漢・リチャードソン クリス・伊藤貴盛・ドラグシャヌ クリスチャン・三浦典子・青木浩・太田充恒・榊原智康・谷水雅治・水谷嘉一・宮永直澄・村山正樹・仙田量子・高柳幸央・井上裕介・川崎啓介・高木真理・川崎啓介・根布悟志・稲吉正美 (1998) 愛知県豊田市北東部の領家花崗岩地域の地球化学図. 地質学雑誌 104(10), 688–704. [doi:10.5575/geosoc.104.688]*

  22. 田中剛・川邊岩夫・山本鋼志・岩森光・平原靖大・三村耕一・浅原良浩・伊藤貴盛・米澤千夏・ドラグシャヌ クリスチャン・神田聡・清水乙彦・林正人・三浦典子・青木浩・太田充恒・戸上薫・鳥海貴弘・松村陽子・榊原智康・谷水雅治・水谷嘉一・宮永直澄・村山正樹・大森扶美子 (1995) 愛知県瀬戸市周辺における河川堆積物中の元素分布と地圏評価の試み. 地球化学 29(2), 113–125. [doi:10.14934/chikyukagaku.29.113]*

 

XAFSを用いた微量元素の局所構造解析

原著論文

  1. Ohta, A., Tanaka, K., and Tsuno, H. (2018) Preliminary evaluation of local structure and speciation of lanthanides in aqueous solution, iron hydroxide, manganese dioxide, and calcite using the L3-edge X-ray absorption near edge structure spectra. J. Phys. Chem. A. 122(41), 8152–8161. [doi: 10.1021/acs.jpca.8b06168]

  2. Ohta, A., Kagi, H., Tsuno, H., Nomura, M., and Okai, T. (2012) Speciation study of Cr(VI/III) reacting with humic substances and determination of local structure of Cr binding humic substances using XAFS spectroscopy. Geochem. J. 46(5), 409–420. [doi:10.2343/geochemj.2.0222]*

  3. Ohta, A., Kagi, H., Nomura, M., Tsuno, H. and Kawabe, I. (2009) Coordination study of rare earth elements in Fe oxyhydroxide and Mn dioxides. Part II. Correspondence of structural change to irregular variations of partitioning coefficients and tetrad effect variations appearing in interatomic distances. Amer. Mineral. 94(4), 476–486. [doi:10.2138/am.2009.2987]

  4. Ohta, A., Kagi, H., Nomura, M., Tsuno, H. and Kawabe, I. (2009) Coordination study of rare earth elements on Fe oxyhydroxide and Mn dioxides: Part I. Influence of a multi-electron excitation on EXAFS analyses of La, Pr, Nd, and Sm. Amer. Mineral. 94(4), 467–475. [doi:10.2138/am.2009.2986]

  5. Odake, S., Fukura, S., Arakawa, M., Ohta, A.., Harte, B. and Kagi, H. (2008) Divalent chromium in ferropericlase inclusions in lower-mantle diamonds revealed by micro-XANES measurements. J. Mineral. Petrol. Sci. 103(5), 350–353. [doi:10.2465/jmps.080620d]*

  6. Ohta, A., Kagi, H., Tsuno, H., Nomura, M. and Kawabe, I. (2008) Influence of multi-electron excitation on EXAFS spectroscopy of trivalent rare-earth ions and elucidation of change in hydration number through the series. Amer. Mineral. 93(8-9), 1384–1392. [doi:10.2138/am.2008.2628]

  7. Yoshida, T., Kagi, H., Tsuno, H., Ohta, A. and Nomura, M. (2005) Oxidation States of Ytterbium Incorporated in Calcium Carbonate and Calcium Fluoride. Chem. Lett. 34(6), 852–853. [doi:10.1246/cl.2005.852]*

Proceedings paper

  1. Ohgi, A., Kagi, H., Arima, H., Ohta, A., Kamada, K., Yoshikawa, A. and Sugiyama, K. (2009) Crystal growth and structural characterizations of Ce-doped Gd9.33(SiO4)6O2 single crystals. Journal of Crystal Growth, 311(3), 526–529 (4th Asian Conference on Crystal Growth and Crystal Technology). [doi:10.1016/j.jcrysgro.2008.09.148]

 

風送ダストの長距離輸送過程の実体解明

原著論文

  1. Zhang, R., Wang, Z., Shen, Z., Yabuki, S., Kanai, Y. and Ohta, A. (2006) Physicochemical characterization and origin of the 20 March 2002 heavy dust storm in Beijing. Aerosol and Air Quality Research 6(3), 268–280. [doi: 10.4209/aaqr.2006.09.0004]

  2. Takahashi, Y., Kanai, Y., Kamioka, H., Ohta, A., Maruyama, H., Song, Z. and Shimizu, H. (2006) Speciation of sulfate in size-fractionated aerosol particles using sulfur K-edge X-ray absorption near-edge structure. Env. Sci. Techno., 40(16), 5052–5057. [doi:10.1021/es060497y]

  3. Ohta, A., Tsuno, H., Kagi, H., Kanai, Y., Zhang, R., Terashima, S. and Nomura, M. (2006) Chemical compositions and XANES speciations of Fe, Mn and Zn from aerosols collected in China and Japan during dust events. Geochem. J. 40(4), 363–376.[doi:10.2343/geochemj.40.363]*

  4. Kanai, Y., Ohta, A., Kamioka, H., Terashima, S., Imai, N., Kanai, M., Shimizu, H., Takahashi, Y., Kai, K., Hayashi, M., Zhang, R. and Sheng, L. (2005) Characterization of Aeolian Dust in East China and Japan from 2001 to 2003. J. Meteor. Soc. Japan 83A, 73–106. [doi:10.2151/jmsj.83A.73]*

  5. Zhang, R., Wang, M., Sheng, L., Kanai, Y. and Ohta, A. (2004) Seasonal characterization of dust days, mass concentrations and dry deposition of atmospheric aerosols over Qingdao, China. China Particuology 2(5), 196–199. [doi:10.1016/S1672-2515(07)60058-X]

  6. Kanai, Y., Ohta, A., Kamioka, H., Terashima, S., Matsuhisa, Y., Shimizu, H., Takahashi, Y., Kai, K., Xu, B., Hayashi, M. and Zhang, R. (2002) Preliminary study on the grain-size distribution and concentration of aeolian dust collected in Japan. J. Arid Land Studies (砂漠研究) 11(4), 307–314.

 

堆積物中の元素挙動

原著論文

  1. Ohta, A., Kubota, R., and Okai, T. (2018) Critical evaluation of zinc speciation in geochemical reference materials by combining sequential extraction and XANES spectroscopy. Geochem. J. 52(5), 385–400. [doi:10.2343/geochemj.2.0527]

  2. Ohta, A. and Kubota, R. (2016) Copper speciation in a collection of geochemical reference materials using sequential extraction and evaluation of the validity using XANES spectroscopy. Geostand. Geoanal. Res. 40(1), 117–134. [doi:10.1111/j.1751-908X.2015.00335.x]

  3. Ohta, A. (2015) Speciation study of Cr in a geochemical reference material sediment series using sequential extraction and XANES spectroscopy. Geostand. Geoanal. Res. 39(1), 87–103. [doi:10.1111/j.1751-908X.2014.00292.x]

  4. Kubota, R., Ohta, A. and Okai, T. (2014) Speciation of 38 elements in eight GSJ geochemical sedimentary reference materials determined using a sequential extraction technique. Geochem. J. 48(2), 165–188. [doi:10.2343/geochemj.2.0297]*

  5. Tsuno, H., Ohta, A., Kagi, H., Imai, N., Tao, H. and Nomura M. (2006) Speciation of chromium in artificially contaminated soil reference material GSJ JSO-2 using XANES and chemical extraction methods. Geostand. Geoanal. Res. 30(1), 55–62. [doi:10.1111/j.1751-908X.2006.tb00911.x]

  6. 寺島滋・太田充恒・岡井貴司・今井登・御子柴(氏家)真澄 (2004) 東海・沖縄地域の非沖積土壌母材と元素の地球化学的研究. 地球科学 58(5), 317–336. [doi:10.15080/agcjchikyukagaku.58.5_317]*

 

分析手法

原著論文

  1. Nakamura, A., Ohta, A., Matsuzaki, H., and Okai, T. (2021) 10Be/9Be ratios of phenakite and beryl measured via direct Cs sputtering: Implications for selecting suitable Be carrier minerals for the measurement of low-level 10Be. Geochem. J. 55(4), 209–222. [doi:10.2343/geochemj.2.0630 ] <pdf>

  2. Nakamura, A., Okai, T., and Ohta, A. (2020) Optimizing the Pratt-type titrimetric method to determine FeO in geochemical reference materials. Geochem. J. 54(5), 337–350. [doi:10.2343/geochemj.2.0605]*

 

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