Updated on 2025/09/23

写真a

 
KOBAYASHI Katsura
 
Organization
Scheduled update Professor
Position
Professor
Homepage
http://pml.misasa.okayama-u.ac.jp
External link

Degree

  • 博士(学術) ( 岡山大学 )

Research Interests

  • Petrology

  • Cosmo-geochemistry

  • 地球宇宙化学

  • 岩石学

Research Areas

  • Natural Science / Solid earth sciences

  • Natural Science / Space and planetary sciences

Research History

  • - 岡山大学惑星物質研究所 教授

    2015

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Professional Memberships

 

Papers

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MISC

Presentations

  • Contribution of the lower crustal material to the magmatic system of Akagi volcano

    Abstracts, Japan Earth and Planetary Science Joint Meeting  1996 

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    Event date： 1996

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  • Investigation of the outermost surface of Itokawa (Hayabusa sample return) using a comprehensive analytical approach

    Solar System Exploration and New Geosciences  2012 

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  • Investigation of the outermost surface of Itokawa (Hayabusa sample return) using a comprehensive analytical approach

    Misasa IV Solar System Exploration and New Geosciences —Perspective for the Next Decade—  2012 

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  • New planetary science arising from"HAYABUSA" recovery sample

    2011 

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  • New planetary science arising from"HAYABUSA" recovery sample

    日本地球惑星科学連合2011年大会  2011 

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  • Two-dimensional distribution of trace elements in a reaction texture in plagioclase lherzolite from the Horoman complex, northern Japan, and its implication in ascent processes of the upper mantle

    2009 American Geophysical Union Fall Meeting  2009 

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  • プレート沈み込みによるマントルへのホウ素輸送：含ダイアモンド電気石のホウ素同位体組成とその意義

    日本地球化学会第55回年会  2008 

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  • Lead isotope systematics of olivine-hosted melt inclusions from Hawaiian lavas

    Goldschidt conference 2008  2008 

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  • Geochemistry of volcanic and plutonic rocks from the southern Musoma-Mara greenstone belt: Implication for the evolution of the Tanzania craton

    Goldschmidt Conference 2008  2008 

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  • Post-entrapment Li isotope fractionation in melt inclusions from Volcan Jorullo, Mexico

    Goldschmidt Conference 2008  2008 

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  • Non-relationship between slab melting and high-Mg andesite from northwestern Kyushu, SW Japan

    Goldschmidt Conference 2008  2008 

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  • Role of asthenospheric and lithospheric mantle incorporated into intraplate volcanism along continental margin: constraints from temporal and spatial geochemical variations of volcanic rocks from northern Kyushu, SW Japan

    The 3rd COE-21 International Symposium MISASA-III "Origin, Evolution and Dynamics of the Earth"  2008 

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  • Transportation of boron by subducting lithosphere; insights from tourmalines from the Kokchetav UHPM belt

    The 3rd COE-21 International Symposium MISASA-III "Origin, Evolution and Dynamics of the Earth"  2008 

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  • Evidence for an extremely light lithium reservoir in the earth’s mantle

    The 3rd COE-21 International Symposium MISASA-III "Origin, Evolution and Dynamics of the Earth"  2008 

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  • The volcanic flare-ups in silicic large igneous provinces: data from the Okhotsk-Chukotka belt, NE Russia

    The 3rd COE-21 International Symposium MISASA-III "Origin, Evolution and Dynamics of the Earth"  2008 

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  • Post-entrapment Li isotope fractionation in olivine-hosted melt inclusions from volcán jorullo, Mexico

    The 3rd COE-21 International Symposium MISASA-III "Origin, Evolution and Dynamics of the Earth"  2008 

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  • Petrography and lead isotopic compositions of olivine-hosted melt inclusions from Hawaiian lavas: implications for magmatism of Hawaiian shield lavas

    The 3rd COE-21 International Symposium MISASA-III "Origin, Evolution and Dynamics of the Earth"  2008 

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  • Recent developments of comprehensive in-situ analytical system in CASTEM

    The 3rd COE-21 International Symposium MISASA-III "Origin, Evolution and Dynamics of the Earth"  2008 

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  • Genesis and evolution of magmas feeding the presentday activity of Stromboli and Etna volcanoes

    The 3rd COE-21 International Symposium MISASA-III "Origin, Evolution and Dynamics of the Earth"  2008 

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  • Multiple pulses of mantle plume: evidence from tertiary icelandic lavas

    The 3rd COE-21 International Symposium MISASA-III "Origin, Evolution and Dynamics of the Earth"  2008 

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  • Geochemical evolution of shallow magma plumbing system in the last 240 years beneath Hekla volcano, iceland: implication from 238U-230Th-226Ra isotopic disequilibria and comprehensive geochemical study

    The 3rd COE-21 International Symposium MISASA-III "Origin, Evolution and Dynamics of the Earth"  2008 

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  • Large-scale fluid flow in a cold subduction-zone: SIMS Li-isotope study of jadeitite veins in Franciscan metagraywacke

    Goldschmidt conference 2007  2007 

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  • Geochemical dynamics in an active margin of East Asia: Implications from the temporal and spatial geochemical evolution of magmatism in northern Kyushu, SW Japan

    Goldschmidt conference 2007  2007 

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  • Phanerozoic crsutal growth constrained by zircon U-Pb age and Sr-Nd-Hf isotopic evidence from the granitoids in Mongolia

    Goldschmidt conference 2007  2007 

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Research Projects

  • Duration of fluid existence on an asteroid

    Grant number：19K03952  2019.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Kunihiro Takuya

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    Grant amount：\4420000 （ Direct expense: \3400000 、 Indirect expense：\1020000 ）

    Twenty-six trace-element-abundances of chondrule constituents were determined using micro beam techniques. According to mass balance calculation, a chondrule has been interacted with Si-rich melt prior to aqueous alteration on an asteroid. Step-wise leaching technique using acid was applied to chondrules to extrace glass. Rubidium-Sr dating was applied to the separated chondrules and yielded age of a few handreds million after the birth of the solar system. Exictence of ice or fluid on the asteroid in such time scale was implied.

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  • An integrated study of Paleo- and Neoproterozoic orogenic processes at the Tanzanian craton margin

    Grant number：24403010  2012.04 - 2015.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    TSUJIMORI Tatsuki, OTA Tsutomu, KOBAYASHI Katsura

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    Grant amount：\17160000 （ Direct expense: \13200000 、 Indirect expense：\3960000 ）

    High-pressure metamorphic rocks occurring sporadically around the Archean Tanzanian craton record a crustal evolution related to Paleo- and Neoproterozoic orogeny. Our integrated studies confirmed that the Paleoproterozoic subduction-related units including eclogite-bearing high-pressure intermediate-type metamorphic belt and coeval paired granitic batholiths are overprinted significantly by a Pan-African granulite-facies regional metamorphism and deformation. The Pan-African events intrusions played the most important role in the crustal evolution.

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  • Elucidation of the dynamic magma system by precise time-scale evaluation

    Grant number：23340160  2011.04 - 2014.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    NAKAMURA Eizo, MAKISHIMA Akio, TANAKA Ryouji, KOBAYASHI Katsura

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    Grant amount：\19760000 （ Direct expense: \15200000 、 Indirect expense：\4560000 ）

    In order to understand the dynamic magma system of volcanoes, we attempted to develop new age dating methods then applied them to natural volcanic ejecta. Consequently, we established new U-Th-Ra disequilibrium dating method by using multi collection ICP-MS, and determined the duration of magma supply sequences of Fuji volcano. Additionally, we examined new K-Ar dating combining the spiked and the unspiked sensitivity method to determine eruption ages less than 0.1 Myrs. This method could be successfully applied for lavas from Bratan volcano in Indonesia. The dynamic eruption model regarding supervolcan eruptions driven by melt buoyancy was established.

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  • The evolution of Archean continental roots : An integrated study of crustal and mantle xenoliths and intracontinental high-pressure metamorphic belts of Tanzania

    Grant number：21340148  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    TSUJIMORI Tatsuki, KOBAYASHI Katsura

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    Grant amount：\17810000 （ Direct expense: \13700000 、 Indirect expense：\4110000 ）

    The lower crustal and lithospheric mantle xenolith suites of the Archean Tanzanian craton show lithological variation from kyanite-bearing high-pressure granulite(rare eclogite) to garnet-bearing peridotites. An integrated study of garnet peridotite xenoliths indicates strongly depleted zone in the lithosphere root at depths of~ 130-145 km ; a few samples suggest an initial stabilization at depths of~ 160 km. Moreover, the study revealed that the cratonic root is pervaded by episodic metasomatic melts, which have interacted with lithospheric mantle beneath the Archean Tanzanian craton. This indicates a physicochemical stratification of the lithospheric mantle beneath the Tanzanian craton.

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  • Technical development of in-situ dating method for tiny zircon and implication for metamorphic dynamics.

    Grant number：20340151  2008 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    KOBAYASHI Katsura, TSUJIMORI Tatsuki, REHMAN Hafiz Ur

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    Grant amount：\16900000 （ Direct expense: \13000000 、 Indirect expense：\3900000 ）

    The main subject of this research was development of in-situ zircon dating method by the secondary ion mass spectrometer. The author succeeded to develop sample polishing technique to get the very flat surface and to prepare reliable zircon standards by conventional techniques, then established new dating method, which can be applied less than 10 micron zircon grain. The method had been applied to the Kohistan high pressure metermorphic rocks and determined ~45 Ma as their metermorphic age.

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  • 二次イオン質量分析計によるメルト包有物・マントル構成鉱物のマルチ同位体解析

    Grant number：17740353  2005 - 2007

    日本学術振興会  科学研究費助成事業  若手研究(B)

    小林 桂

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    Grant amount：\3400000 （ Direct expense: \3400000 ）

    岡山大学地球物質科学研究センターの高質量分解能二次イオン質量分析言(Cameca ims-1270)は、申請者を中心として運用され、本科学研究費補助金支給期間である平成17〜19年度にわたり大きな研究成果をあげてきた。本年度は、同研究計画の最終年度にあたり、研究期間において作成してきた高精度同位体および微量元素組成に関する標準物質を活用し、天然物質の解析に取り組んできた。とりわけ、玄武岩質ガラスの局所鉛同位体分析法をハワイ火山岩中のオリビンメルト包有物に適用し、詳細な斑晶オリビンの記載と合わせることによって、'鉛同位体の不均質性に関する検討を精力的に行った。この研究成果は現在論文として公表すべく、執筆を進めている。また局所酸素同位体分析に用いる標準物質を、当センターに既設の安定同位体質量分析計(VG PRISM,SIRA12)を用い作成することができた。これを用いた同位体解析にも精力的に取り組む体制が整ったといえる。本科学研究経費支給期間において、リチウム、ホウ素、鉛、酸素同位体の高精度・高確度局所分析が、ガラス試料および、マントル鉱物を中心とした鉱物試料(たとえばオリビンのリチウム同位体組成分析)が確立したことは、今後の応用研究にとっても大きな進歩であるだろう。
    さらに、高質量分解能二次イオン質量分析計の1次イオン系に新たなレンズシステムを導入し、同イオン電流量の条件において、従来比約60%のビーム径で分析可能にしたことも技術的に大きな成果であった。これによりさらに高空間分解能分析が可能となり、より局所的な分析へと応用範囲が広がるであろう。

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  • Lake Nyos in dual agony-An assessment of the limnic eruption and dam collapse-

    Grant number：16403012  2004 - 2005

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    KUSAKABE Minoru, SATAKE Hiroshi, KOBAYASHI Katsura

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    Grant amount：\13200000 （ Direct expense: \13200000 ）

    The following results have been obtained through this geochemical studies on the limnic eruption at Lake Nyos and the age of Lake Nyos maar.
    (1)Buildup_of_magmatic_CO_2_at_lakes_Nyos_and_Monoun_and_its_artificial_degassing : Lakes Nyos and Monoun have been known as notorious crater lakes, because they suddenly exploded in mid-80s, claiming about 1800 lives. Continuous observations since 1986 by the head investigator and his colleagues have demonstrated that the lakes are continuously charged by magmatic CO_2 of mantle origin, resulting in a steady increase in the amount of dissolved CO_2, and that recurrence of the limnic eruption followed by a gas disaster is highly likely at both lakes. Artificial degassing apparatus was installed at each lake in 2001-2003. However the degassing rate is not high enough to reduce the gas content to a safe level in several years. Thus danger of the recurrence of limnic eruption still remains.
    In this study, we estimated the current rates of gas recharge and removal. Based on the estimate we have modeled the change with time in the CO_2 content of the lakes. It will take more than 30 years to make Lake Nyos safe. At Lake Monoun the gas content would become steady within several years under the current CO_2 recharge-removal rates. Fortunately additional degassing pipes were installed at Lake Monoun in 2006. If degassing pipes keep working, Lake Monoun would become safe in the near future. Lake Nyos still remains unsafe.
    (2)Chronology of Lake Nyos dam : Lake Nyos is bound by a 45 m high natural dam at the north end. The dam consists of poorly consolidated pyroclastic materials that deposited at the time of the maar formation. It has been suggested that the dam is fragile and has been eroded away in a high rate since the formation of the lake. It may collapse in the near future. The dam collapse would result in a large scale flooding downstream which reaches Nigeria. In order to estimate the erosion rate, it is essential to obtain a reliable age of the maar formation. We have determined the age of the dam to be ca.5000 years B.P.using the U-Th-Ra dating method. This age is much older than 400 years obtained by the ^<14>C method and much younger than the K-Ar dates of ca.400 ka. Our new age would give an important constraint on the erosion rate of the dam.

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  • Study for distribution and behavior of siderophile and chalcophile elements in the mantle.

    Grant number：15340188  2003 - 2005

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    MAKISHIMA Akio, NAKAMURA Eizo, KOBAYASHI Katsura

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    Grant amount：\9500000 （ Direct expense: \9500000 ）

    We have studied for distribution and behavior siderophile and chalcophle elements in the mantle. For this purpose, we have developed : (1)new analytical methods for determination of platinum group elements (PGEs) ; (2)the new analytical methods for siderophile, chalcophile and lithophile elements except for PGEs ; (3)the new analytical method for precise determination of Re and Os isotope ratios for application to Re-Os isotope systematics.
    We first developed the new sample digestion method for determination of PGEs. In this study, we have designed an utterly new digestion vessel, which is cheap, simple and applicable up to 300C. We have proposed the patent. If this patent is accepted, this will be used all over the world, although the patent was just proposed in Japan, because of the lack of money. There was a reply from the Japanese Patent Office, and we replied and modified the patent.
    We also developed the new determination method for Bi,Tl,In,Li,Be,Rb,Sr,Y,Cs,Ba,La,Ce,Pr,Nd,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu,Pb,Th and U using Q-pole type ICP-MS (ICP-QMS). We developed isotope-dilution internal standardization method (ID-IS). In this method, when the sample is digested with Sm spike, then, the elemental analysis is performed without knowing the exact dilution factor. We developed pseudo-FI method, in which only 0.1mL of sample solution is required for determination of these elements. Furthermore, we developed the determination method for Na,Mg,Al,P,Ca,V,Mn,Fe,Co,K,Sc,Ni,Cu,Zn and Ga using the same sample solution by sector type ICP-MS (ICP-SFMS). These methods are submitted to Geostandards and Geoanalytical Research. In addition, precise determination methods for B,Ti,Zr,Nb,Mo,Sn,Sb,Hf and Ta using ID-IS and pseudo-FI methods by ICP-QMS and ICP-SFMS were developed and submitted.
    We also developed new analytical methods for Re and Os isotope analysis using multiple collector ICP-MS (MC-ICP-MS). In this study, Os and Re of <1pg can be measured precisely, which can only be achieved by N-TIMS. This study has been accepted Analytical Chemistry (in press).
    Unfortunately, the development of analytical technique required far longer time than we had expected, thus the analysis of mantle samples are in future. Although, we have developed analytical methods, application will not take long time to accomplish.

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  • Establishment of high-accuracy dating method of tiny zircon (<10μm) : Implication for age determination of the oldest rock on the Earth

    Grant number：15340192  2003 - 2005

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    NAKAMURA Eizo, MAKISHIMA Akio, MORIGUTI Takuya, KOBAYASHI Katsura

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    Grant amount：\16300000 （ Direct expense: \16300000 ）

    In-situ age dating of zircon provides us the important information to understand complicated geological events, and the purpose of this research is to improve the new age dating method using high mass resolution ion probe, Cameca ims-1270. One of the key devices to establish this research project was high-spatial resolution optical microscope for the Camaca ion probe. The authors developed the new optical microscope system (PMLOpt-1) jointly with OLIMPUS Co.Ltd, and installed the system in our ion probe system. As a result, the expected optical resolution, less than 4μm, has been established, on in-situ observation by ion probe analysis. The obtained special resolution by this system is comparable with that by SEM-EDX and CL analysis. Combining observation by the newly installed optical microscope and "Visual Stage" system, which is database system handling the target's coordinates on the sample mount, we could very precise age data based on the detail description of sample. The authors also had been developed the precise in-situ age dating method using the reliable zircon standards, which had been confirmed by the conventional TIMS technique. These high-quality zircon standards confirm the accuracy of age data by the ion probe analysis. The authors applied the developed technique for the zircon mainly from metamorphic rock suites. Typical grain size of zircon in metamorphic rock is less than several tens micrometer, therefore, the high-spatial resolution dating, we developed, is essential. Analytical results with other geochemical discussions are published and/or preparing for the publication.

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  • 高分解能二次イオン質量分析計によるアイスランドプリュームの物質化学進化過程の解析

    Grant number：14740304  2002 - 2004

    日本学術振興会  科学研究費助成事業  若手研究(B)

    小林 桂

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    Grant amount：\3300000 （ Direct expense: \3300000 ）

    本年度は,アイスランド噴出物のLi-B-Pb同位体組成の時間変動を中心に解析を行うため、噴出年代に沿って系統的に採集を行った試料(約200試料,2001年夏に採集済み)に加え、2003年夏に3週間にわたって現地地質調査・試料採取(約350試料)を行った。薄片の光学顕微鏡による記載の結果、オリビン斑晶中には最大直径100m程度のガラス包有物が観察される試料の存在が、ピクライト質玄武岩中に確認された。また高分解能二次イオン質量分析計によるリチウム・ホウ素・鉛同位体測定法の改良として、従来より用いていたソレアイト質島弧玄武岩ガラスをマトリクスとする標準試料に加え、アイスランドなどの海洋島に普遍的に見られる玄武岩をマトリクスとする標準試料の作成を実施し、標準試料セットを確立した。この手法を用い、アイスランドマグマの物理化学進化のリファレンスとなるハワイの海洋島玄武岩に含まれるオリビン斑晶中のガラス包有物のリチウム・ホウ素・鉛同位体測定を行い、ガラス包有物中の同位体の変動が、全岩分析のそれよりもはるかに大きいことを明らかにした。これらの現象は、アイスランドやハワイの火山岩を形成するマントルプリュームの、地球化学的不均質を明瞭にあらわしている。各同位体間のシステマティクスを詳細に検討した結果、ガラス包有物中には、沈み込み帯において脱水反応に伴う同位体分別を起こしたリチウム・ホウ素同位体組成が観察されるとともに、ハワイにおいてHIMU的特徴を持つ包有物を発見した。このことはプリュームの地球化学的不均質の形成に関して、地球史を通じた物質循環が重要な役割を果たしたと考察できる。以上の成果は論文として国際誌に発表した。

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Media Coverage

  • 生命の起源 隕石説後押し Newspaper, magazine

    中日新聞東京本社  東京新聞  2022.6.14

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