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1990 Fiscal Year Final Research Report Summary

Studies on Rare-earth and Radioactive Minerals of Alkalline Complexes in Brazil.

Research Project

Project/Area Number 01041020
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionField Research
Research InstitutionUniversity of Tokyo

Principal Investigator

TOKONAMI Masayasu  Faculty of Science, University of Tokyo Professor, 理学部, 教授 (80029850)

Co-Investigator(Kenkyū-buntansha) MINATO Hideo  College of Arts and Sciences, University of Tokyo, Professor Emeritus, 教養学部, 名誉教授 (40012207)
HASUI Yociteru  Institute de Geosciencias Universidade de Estadual Paulista (UNESP), Brazil, Pro, 地質学教室(ブラジル), 教授
HIODO Y. Francisoco  Institute de Astronomico e Geophisico, Universidade de Sao Paulo (USP), Brazil,, 天文地球物理教室(ブラジル), 助教授
TOYODA Kazuhiro  Faculty of Science, University of Tokyo Research Associate, 理学部, 助手 (10207649)
AIKAWA Nobuyuki  Faculty of Science, Osaka City University Associate Professor, 理学部, 助教授 (20047327)
HAGA Nobuhiko  Faculty of Science, Himeji Institute of Techonology, Associate Professor, 理学部, 助教授 (60011748)
OZAWA Tohru  Faculty of Science, University of Tokyo Lecturer, 理学部, 講師 (00011651)
HORIUCHI Hiroyuki  Faculty of Science, University of Tokyo Associate Professor, 理学部, 助教授 (80029892)
Project Period (FY) 1989 – 1990
KeywordsMineralogical survey in Brazil / Alkaline rocks / Carbonates / Rare-earth minerals / Weathered rocks / Phosphate and titanium mines in Brazil / Mineral textures / Radioactive minerals
Research Abstract

Research surveys of this project were performed for two years of 1989 and 1990, but have actually been continued since 1987. Main subjects of this project are the surveys of minerals which are closely related to alkaline rocks and carbonatite-alkaline complexes in Brazil and understanding their occurrences, mineral assemblages, textures, chemical compositions and so on. Concentration of rare-earth elements are characteristic in the complexes, and radioactive elements are often accompanied in minerals. Therefore, their minerals are also intersted as a natural analogue for the basic research of solidification and stabilities of radioactive wasted materials.
In this project, survey and collection of rocks minerals were carried out in the carbonatitealkaline complexes which dot Brazilian shield along the lines from south to north. The main surveyed areas and collected rocks and minerals are summarized as follows : (1) fresh carbonatites and jacupirangite, and their thermal metamorphic rocks … More at the boundaries of carbonatites and jacupirangites at mines near Cajati in the state of Santa Catarina ; (2) Alkaline rocks such as caldasite which is extraordinarily enriched in Zr, phonolite, tinguite, rocks which include radioactive elements, ultrabasic rocks mainly composed of magnetite and so on, at Pocos de Caldas at the boundary of both states of Sao Paulo and Minas Gerais ; (3) Minerals of perovskite, anatase, pyrochlore and so on which are obtained from carbonatite-alkaline complexes at Araxa and Tapira in Minas Gerais ; (4) Weathered soil of carbonatie-alkaline complexes which are concentrated by such rare-earth elements as La and Ce at Catalao in the south of state of Goias ; (5) Ultrabasic rocks of which main components are crysotile, graphite and so on at Minacu of Minas Gerais ; (6) Zircon bearing alkaline rocks at Peixe in the State of Tocantins ; and (7) Nephelin-syenite and sodalite-nephelin syenite in south Bahia and in Para. The ages of intrusion of above alkaline rocks estimated in the range from 70-130Ma.
All of collected samples are difficult to obtain in Japan and indispensable specimens in order to study the origin of carbon, minerallization processes of phosphate and rare-earth minerals, weathering processes, and description of varieties of minerals, and so on. The textures, constituent minerals, and their chemical compositions of some of above specimens have already been described by observations of optical microscope, X-ray diffraction apparatus, scanning electron microscope and so on, and further works will be continued in future.
We wish to thank Brasilian scientists, many geologists in mines which we visited, for their colaborations and helps. We feel deep mortification at Professor Kenkichi FUJIMORI's sudden decease by cancer in July of 1990, who strongly promoted this project as one of investigators of this project. Less

  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] 芳賀 信彦: "Araxa(ブラジル)におけるカ-ボナタイトの構成鉱物" 日本鉱物学会1989年年会講演要旨集. 83 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石田 聡: "ブラジル・カタロンのアルカリ岩・カ-ボナタイト複合岩の鉱物風化" 日本鉱物学会1989年年会講演要旨集. 84 (1989)

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      「研究成果報告書概要(和文)」より
  • [Publications] 小澤 徹: "ブラジル南部、カ-ボナタイト地域産の磁鉄鉱の研究" 日本鉱物学会1989年年会講演要旨集. 60 (1989)

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      「研究成果報告書概要(和文)」より
  • [Publications] 堀内 弘之: "ブラジル・タッピ-ラのグリメライト中のCaーZrーTiーO系鉱物" 日本鉱物学会1989年年会講演要旨集. 61 (1989)

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      「研究成果報告書概要(和文)」より
  • [Publications] 堀内 弘之: "ペロブスカイトおよびその仮像のアナタ-ゼ" 日本鉱山地質・日本岩石鉱物鉱床・日本鉱物学会連合学会(三鉱学会)1989年講演要旨集. 150 (1989)

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  • [Publications] 田中 雅彦: "微小領域X線回折による鉱物組織の研究" 日本結晶学会1989年年会講演要旨集. TA-18 (1989)

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  • [Publications] 豊田 和弘: "機器光量子放射化分析法による標準岩石試料およびカ-ボナタイト風化土壌試料の分析" 核理研研究報告. 22. 117-122 (1989)

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  • [Publications] 小澤 徹: "ブラジル、アルカリ岩・カ-ボナタイト複合岩中の鉱物の研究" 東京大学総合研究資料館ニュ-ス. 20. 1-3 (1990)

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  • [Publications] 堀内 弘之: "X線回折による鉱物組織の研究ー装置および解析法ー" 日本鉱物学会1990年年会講演要旨集. 54 (1990)

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  • [Publications] 立川 統: "EDS,WDXコンバインシステムによる鉱物の元素マップの観察" 日本鉱物学会1990年年会講演要旨集. 61 (1990)

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  • [Publications] 立川 統: "炭酸塩質マグマとジャクピランガイトとの接触変成に伴う鉱物組織" 日本鉱山地質・日本岩石鉱物鉱床・日本鉱物学会連合学会(三鉱学会)1990年講演要旨集. 150 (1990)

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  • [Publications] 湊 秀雄: "兵庫県社町周辺の斜プチロル沸石の産状と鉱物学的性質、特に島根県玉造産のものとの比較" 鉱物学雑誌. 19. 193-208 (1990)

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  • [Publications] 湊 秀雄: "ドイツ南部Kaiserstuhl産響石についてー含沸石の一形式" 日本岩石鉱物鉱床学会1991年年会. (1991)

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  • [Publications] Nobuhiko HAGA: "Constituent Minerals in Carbonatites in Araxa (Brazil)." Collected Abstracts of Mineralogical Society of Japan. 83 (1989)

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  • [Publications] Satoshi ISHIDA: "Weathering of Alkaline-Carbonatite Complexes in Catalao in Brazil." Collected Abstracts of Mineralogical Society of Japan. 84 (1989)

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  • [Publications] Tohru OZAWA: "Studies on magnetites in carbonatites of southern area in Brazil" Collected Abstracts of Mineralogical Society of Japan. 60 (1989)

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  • [Publications] Hiroyuki HORIUCHI: "Ca-Zr-Ti-O minerals in glimmerite of Tapira, Brazil." Collected Abstracts of Mineralogical Society of Japan. 61 (1989)

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  • [Publications] Hiroyuki HORIUCHI: "Anatase as a Pseudomorph of Perovskite." Joint Annual Meeting Abstracts, Mineralogical Society of Japan, Japanese Association of Mineralogy, Petrology and Economic Geology, and Society of Mining Geologists of Japan. 150 (1989)

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  • [Publications] Masahiko TANAKA: "New Approach of Study of Mineral Textures by Microarea X-ray Diffraction." Collected Abstracts of Crystallographic Society of Japan. 18 (1989)

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  • [Publications] Kazuhiro TOYODA: "Instrumental Photon Activation Analysis of Rock Reference Samples and Soil Samples of Carbonatites." Research Report of Laboratory of Nuclear Science Tohoku University. 22-1. 117-122 (1989)

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  • [Publications] Tohru OZAWA: "Studies on Mineral Species of Alkaline-Carbonatite complexes of Brazil." The University Museum News, University of Tokyo. 20. 1-3 (1990)

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  • [Publications] Hiroyuki HORIUCHI: "Development of Instrument and Softwares for Analysis of Mineral Textures by X-ray Diffraction Method." Collected Abstracts of Mineralogical Society of Japan. 54 (1990)

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  • [Publications] Osamu TACHIKAWA: "Development of Combined System of EDS and WDX, and its Application to Observation of Atom Distribution in Mineral Textures." Collected Abstracts of Mineralogical Society of Japan. 64 (1990)

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  • [Publications] Osamu TACHIKAWA: "Mineral Textures of the Contact of Jacpirangite and Carbonatites." Joint Annual Meeting Abstracts, Mineralogical Society of Japan, Japanese Association of Mineralogy, Petrology and Economic Geology, and Society of Mining Geologists of Japan. 150 (1990)

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  • [Publications] Hideo MINATO: "Mode of Occurrence and Mineralogical Properties of Clinoptilolite from Zeolite Tuff in Yashiro-cho Area, Hyogo Prefecture, Especially for the Comparison with the Specimen fro Those from Tamatsukuri, Shimane Prefecture." Journal of the Mineralogical Society of Japan. 19-4. 193-208 (1990)

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  • [Publications] Hideo MINATO: "On phonolite from Kaiserstuhl, southwest Germany-as one type of zeolite bearing rock." Collected Abstracts of Japanese Association of Mineralogy, Petrology and Economic Geology,. (1991)

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Published: 1993-08-12  

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