著者

小川 雨田雄

出版者

日本鉱物科学会

雑誌

岩石礦物礦床學 (ISSN:18830757)

巻号頁・発行日

vol.21, no.6, pp.285-288, 1939-06-01 (Released:2008-03-18)

参考文献数

7

著者

柳沢 文孝 渡辺 晃二

出版者

日本鉱物科学会

雑誌

鉱物学雜誌 (ISSN:04541146)

巻号頁・発行日

vol.15, no.Special, pp.133-145, 1981-03-15 (Released:2009-08-11)

参考文献数

10

被引用文献数

1 1

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The Tono Mine, Gifu Prefecture is one of the richest sedimentary uranium deposits in Japan. This areas is mainly composed of Tertiary system overlying granite basement. Uranium has been deposited in the lower part of the Tertiary sediments, Mizunami Group, and its location is controlled by the socalled channel structure of the surface of the basement granites. The matrixes of these sediments usually contain tuffaceous materials, which have been argillized and zeolitized diagenetically, and uranium was absorbed in clinoptilolite. The clay mineral species and their relative amounts are closely related to the redox potential and hydrogen ion concentration of the deposits, which are controlled by the movement of groundwater. Main authigenic minerals are montmorillonite, kaolinite, halloysite, sericite and clinoptilolite. In an S-N gallery, the amount of montmorillonite regularly decreases with increasing amount of kaolin minerals and uranium contents. Some iron minerals and calcium minerals are closely associated with clay minerals, zeolite and uranium contents, so the stability relation of their minerals and mineral paragenesis suggest the environments of alteration in this area.

著者

山口 佳昭 原田 英男 太田 靖

出版者

日本鉱物科学会

雑誌

日本岩石鉱物鉱床学会 学術講演会 講演要旨集

巻号頁・発行日

vol.2004, pp.3-3, 2004

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日本の中部地域では,太平洋プレートの沈み込みの深度が増加すると(> およそ160 Km,浅間火山(天仁噴火),妙高火山,北アルプスの白馬風吹岳,立山火山,雲の平火山),高K2Oマグマバッチが生成する.高K2Oマグマバッチの証拠が,次のように示される.1)アブサロカイト-ショショナイト組成の高K2Oメルト包有物がカンラン石や単斜輝石の斑晶中に捕獲されている.2)火山岩の石基が不均質である.隠微晶質のアノーソクレース-カリ長石と高K2Oガラスで構成される高K2Oバッチ(領域)が見いだされる. こうした高K2Oマグマバッチの証拠は,私たちが調べた限りでは,東北日本-関東の火山フロント(樽前火山,クッタラ火山,有珠火山,岩手火山,那須火山など)や 伊豆-箱根(富士,箱根,三宅島など)の火山の噴出物からはまったく見いだされず,太平洋プレートの沈み込みの深い地域の火山に限られる.この高K2Oバッチは,背弧側に向かうマグマ(全岩組成)の系統的なK2Oの増加に寄与していると期待する.

著者

田近 英一

出版者

日本鉱物科学会

雑誌

鉱物学雜誌 (ISSN:04541146)

巻号頁・発行日

vol.25, no.4, pp.151-161, 1996-10-31 (Released:2009-08-11)

参考文献数

44

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Water probably has played significant roles in the origin and evolution of the Earth. During the accretion period, an H2-H2O atmosphere would have been formed by impact degassing of planetesimals, which may have resulted in the formation of magma ocean (hence promoted metal-silicate separation) and condensed to form the proto-ocean. During the evolution of the Earth, water would have circulated between the surface and mantle reservoirs. This global water cycle may have controlled the ocean mass and water content in the mantle as it coupled with thermal evolution of the Earth through mantle rheology. It may also have oxidized the mantle and the atmosphere in the Earth's history.

著者

福地 伸章 松枝 大治

出版者

日本鉱物科学会

雑誌

日本鉱物科学会年会講演要旨集

巻号頁・発行日

vol.2009, pp.115-115, 2009

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ミャンマー, Mogok地域は,ルビー・サファイア,スピネル,トパズ,電気石などの宝石鉱物を産出する地域として知られる.上八洞石(Johachidolite; CaAl[B3O7])は,岩瀬,斎藤(1942)により北朝鮮吉州上八洞から発見された新鉱物で,最近になって本地域のペグマタイト中からもその産出が報告された.この上八洞石は淡黄緑色と橙黄色部からなり,少量のThを含むのが特徴である.今回は鏡下観察,EPMAによる化学組成,カソードルミネッセンス(SEM-CL)像の観察に加えび流体包有物測定等により本鉱物の生成環境に関して得られた知見を報告する.

著者

荒川 謙治

出版者

日本鉱物科学会

雑誌

岩石礦物礦床學 (ISSN:18830757)

巻号頁・発行日

vol.10, no.6, pp.270-277, 1933-12-01 (Released:2008-03-18)

著者

薛 献宇 神崎 正美 Shatskiy Anton

出版者

日本鉱物科学会

雑誌

日本鉱物科学会年会講演要旨集

巻号頁・発行日

vol.2007, pp.130-130, 2007

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We have applied one-dimensional (1D) 1H and 29Si MAS NMR and 1H-29Si cross-polarization (CP) MAS NMR, and 2D 1H NOESY, high-resolution 1H CRAMPS (FSLG)-MAS NMR, 1H double-quantum filtered (DQF) single-quantum (1Q) -1Q correlation MAS NMR and 1H-29Si heteronuclear correlation (HETCOR) NMR techniques to gain new insights into the structure of two phases of potential mantle water reservoir, phase D and superhydrous B. Two samples containing both phases have been synthesized from a mixture of Mg(OH)2 and SiO2 at 24 GPa and 900-1100C. For phase D, the 29Si NMR spectra contain a nearly symmetric, broad peak near -177.7 ppm, attributable to octahedral Si with a disordered local structure. The high-resolution 1H CRAMPS spectra contain a main peak near 12.6 ppm with two shoulders near 10 and 7 ppm, suggesting a disordered proton distribution, mostly with shorter hydrogen bonds than previously suggested. For superhydrous B, our 2D NMR data have clearly revealed that it contains dissimilar proton (H1-H2) pairs and one tetrahedral Si site, consistent with space group Pnn2.

著者

皆川 鉄雄

出版者

日本鉱物科学会

雑誌

岩石鉱物科学 (ISSN:1345630X)

巻号頁・発行日

vol.42, no.1, pp.30-33, 2013-01-30

出版者

日本鉱物科学会

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.71, no.3, pp.79-92, 1976 (Released:2012-07-13)

著者

榊原 正幸 上原 誠一郎

出版者

日本鉱物科学会

雑誌

岩石鉱物科学 (ISSN:1345630X)

巻号頁・発行日

vol.35, no.1, pp.3-10, 2006-01-20

被引用文献数

3 1

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The term asbestos is a generic designation given to six types of naturally occurring mineral fibers that are or have been used in commercial products. These fibers belong to two mineral groups: serpentines and amphiboles. The serpentine group contains a single asbestiform variety: chrysotile. The amphibole group contains five asbestiform amphibole varieties: anthophyllite, grunerite (amosite), riebeckite (crocidolite), tremolite and actinolite.<br>     These fibrous minerals share several properties which qualify them as asbestiform fibers. They are bundles of fibers which can be easily cleaved into thinner fibers. Several properties that make asbestos so versatile and cost effective are high tensile strength, chemical and thermal stability, high flexibility, and low electrical conductivity.<br>     Asbestos fibers have been used in a broad variety of industrial application; some 3000 applications such as roofing products, gaskets, and friction products. 80% of imported asbestos is used for cement products such as asbestos boards and slates which are used for building materials, 7% for friction materials, and less than 3% for asbestos textile. Nearly all of the asbestos produced worldwide is chrysotile. Historically, chrysotile has accounted for more than 90% of the world's asbestos production, and it presently accounts for over 99% of the world production. Two types of amphiboles, commonly designated as amosite and crocidolite are no longer mined. With the onset of the health issues concerning asbestos in the late 1960s and early 1970s, world production and consumption began to decline during the 1980s. Japan used approximately 6.7 million tons between 1974 and 2004. About 67% of this amount was used since 1930.<br>     The relationship between workplace exposure to airborne asbestos fibers and respiratory diseases is one of the most widely studied subjects of modern epidemiology. The research efforts resulted in significant consensus that asbestos fibers can be associated with diseases of asbestosis, lung cancer and mesothelioma. Its carcinogenic nature, an overall lack of knowledge of minimum safe exposure levels, and the long latency for the development of lung cancer and mesothelioma are the main contributing factors to these controversies.

著者

伊藤 俊彦

出版者

日本鉱物科学会

雑誌

岩鉱 (ISSN:09149783)

巻号頁・発行日

vol.91, no.6, pp.209-219, 1996 (Released:2006-11-25)

参考文献数

22

被引用文献数

8 27

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氷点下の気温になる冬季間,北海道足寄町螺湾のシオワッカ冷泉からの弱い流れの中で,ikaiteが生じている。積雪の少ない年には,氷に閉じこめられた産状でikaiteからなる輪縁石ダムが見られた。海洋,湖沼以外である流水域におけるikaiteの生成はこれまでは知られていない。先年の夏に同地域から,calciteといっしょにmonohydrocalciteの生成が知られたところから,冬のikaiteの生成が予想された。シオワッカ冷泉石灰華からはikaiteからの転移鉱物のvateriteを加えると,aragoniteを除き,自然界での炭酸カルシウム塩鉱物のほとんど全てが得られた。本地における夏から冬の間の炭酸カルシウム塩鉱物の生成の過程を,産状から考察した。これらの鉱物の生成における必要条件は,水質のほか,水温(ikaite,calcite),地表面の濡れ(monohydrocalcite:伊藤,1993),など,それぞれによって異なる。また,シオワッカ冷泉の水質,ikaiteおよびvateriteのX線粉末回折線値,ikaiteから転移した後の方解石の化学組成を示した。     Ikaiteが冷たい海域,深海堆積物から次々と発見されたことから,1982年来,これまで源鉱物の明らかでなかったglendoniteや玄能石と呼ばれてきた方解石仮像の源鉱物がikaiteであるとする説が多く出されてきた。しかし,ikaiteの結晶形と一般的な大きさはこれまでに知られている方解石仮像と一致しない。ここでは,方解石仮像に特徴的な四角錐に対応する結晶形が,走査型電子顕微鏡で観察されたikaiteの結晶面の組み合わせによって導かれることを示した。Ashoro-cho 足寄町,Rawan 螺湾,Shiowakka シオワッカ,Konbumori 昆布森

著者

松原 聰

出版者

日本鉱物科学会

雑誌

岩石鉱物科学 (ISSN:1345630X)

巻号頁・発行日

vol.31, no.5, pp.261-267, 2002-09-30

被引用文献数

1

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According to the recommended nomenclature for zeolite minerals by the subcommittee on zeolites of the Commission on new minerals and mineral names of IMA (1997), 83 species have been defined. After the recommended report, three new zeolites have been approved in the Commission up to the date. Though gmelinite-K was recorded in the zeolite report of 1997, it was formally approved in 1999. Here, all 85 spicies are summerized and the 41 species among them found in Japan are briefly reviewed.

著者

三浦 裕行

出版者

日本鉱物科学会

雑誌

鉱物学雜誌 (ISSN:04541146)

巻号頁・発行日

vol.25, no.1, pp.9-10, 1996-01-25 (Released:2009-08-11)

参考文献数

8

著者

桜井 欽一 加藤 昭

出版者

日本鉱物科学会

雑誌

鉱物学雜誌 (ISSN:04541146)

巻号頁・発行日

vol.7, no.5, pp.346-348, 1965-11-30 (Released:2009-08-11)

被引用文献数

1

著者

HORI Hidemichi KOBAYASHI Toshinori MIYAWAKI Ritsuro MATSUBARA Satoshi YOKOYAMA Kazumi SHIMIZU Masaaki

出版者

日本鉱物科学会

雑誌

Journal of mineralogical and petrological sciences (ISSN:13456296)

巻号頁・発行日

vol.101, no.4, pp.170-177, 2006-08-01

被引用文献数

1 8

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Iwashiroite-(Y), YTaO₄, was found from Suishoyama, Kawamata Town, Fukushima Prefecture, Japan. It is monoclinic</i>, <i>P</i>2/<i>a</i>, <i>a</i> = 5.262(5) Å, <i>b</i> = 5.451(5) Å, <i>c</i> = 5.110(5) Å, β = 95.12(10)°, <i>V</i> = 146.0(2) ų, Z = 2. The five strongest lines in the powder XRD pattern [<i>d</i>(Å), <i>I</i>/<i>I</i>₀, <i>hkl</i>] are (3.13, 100, 111), (2.95, 94, 111), (2.73, 26, 020), (1.890, 29, 220) and (1.862, 29, 022). Electron microprobe analysis gave; Y₂O₃ 29.10, Ce₂O₃ 0.10, Nd₂O₃ 0.10, Sm₂O₃ 0.36, Gd₂O₃ 1.06, Tb₂O₃ 0.25, Dy₂O₃ 2.38, Ho₂O₃ 0.56, Er₂O₃ 2.09, Tm₂O₃ 0.37, Yb₂O₃ 3.33, Lu₂O₃ 0.85, ThO₂ 0.02, UO₂ 0.15, CaO 0.17, Ta₂O₅ 40.64, Nb₂O₅ 16.66, TiO₂ 0.41, total 98.60 wt%, and leads to the empirical formula, (Y_0.81Yb_0.05Dy_0.04Er_0.03</sub>Gd_0.02Lu_0.01Ho_0.01Sm_0.01Ca_0.01Tm_0.01)_Σ1.00(Ta_0.58Nb_0.39T_i0.02)_Σ0.99O₄ on the basis of the 4 oxygen atoms per formula unit. Iwashiroite-(Y) is translucent and amber brown to brown in color with a glassy to subadamantine luster. The streak is pale brown and cleavage is {010} good, {001} poor. The Mohs' hardness is 6. The calculated density is 7.1 g/cm³. Iwashiroite-(Y) occurs as an aggregate of small euhedral platy crystals with a metamict substance in the main ore body of the granite pegmatite mine at the locality. Associated minerals are quartz, microcline and annite. The crystal structure was refined to <i>R</i> = 0.034 with single crystal XRD data. Although the structure consists of TaO₆ octahedra and YO₈ polyhedra, iwashiroite-(Y) is not isostructural with fergusonite-beta-(Y).

著者

工藤 康弘 大里 齊 西 文人

出版者

日本鉱物科学会

雑誌

岩石鉱物科学 (ISSN:1345630X)

巻号頁・発行日

vol.32, no.3, pp.138-141, 2003-05-30

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A session for structural sciences in mineralogy has been organized as the micro-symposia in the 50^th anniversary meeting of the Mineralogical Society of Japan, October 2-3, 2002, Osaka, Japan. Three invited and 19 contributed papers were presented in the three oral and one poster sessions. Three topics were presented in the invited talks: I. New structural concepts in mineralogy, II. Design of materials based on the correlation between crystal structure and properties, and III. Crystal structure of (Sr_<i>x</i>,Ca_1−<i>x</i>)₂SiO₄ (x=0∼1).