著者

桃井 斉

出版者

Japan Association of Mineralogical Sciences

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.71, no.Special1, pp.133-142, 1976-07-15 (Released:2012-08-03)

参考文献数

40

著者

坂本 尚史 鈴木 滋 立松 英信 大塚 良平

出版者

Japan Association of Mineralogical Sciences

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.75, no.5, pp.164-171, 1980-05-05 (Released:2008-08-07)

参考文献数

6

被引用文献数

1 3

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青函トンネルの先進導坑,北海道方約5000mの地点において,新第三紀訓縫層中の断層を埋めて産する茶褐色の鱗片状鉱物がサンコーコンサルタント,伊藤昌史氏により発見された。この試料は,早稲田大学鞠子正教授を経て筆者らに提供され,その後の室内研究により我国での3番目の産出である鉄セピオライトであることが明らかにされた。 化学分析値から計算された脱水相の単位胞の1/2構造式は以下の通りである。 (Si11.49Ti0.03Al0.38Fe3+0.10)12.00(Fe3+1.25Fe2+0.26Mn0.02Mg6.00)7.53O32・Ca0.03Na0.05K0.04 一方,FeをすべてFe2+であるとしてO30(OH)4をもとにして構造式を計算すると (Si11.74Ti0.03Al0.23)12.00(Al0.16Fe2+1.65Mn0.02Mg6.13)7.96O30(OH)4・Ca0.03Na0.05K0.04 となり,理想式によく一致する,従って,この鉄セピオライト中のFeは当初Fe2+として形成され,その後酸化されたものと考えられた。 この論文では,このほかに,X線回折データ,熱分析データ等の鉱物学的データが示されている。

著者

鈴木 重人 伊藤 正裕 杉浦 孜

出版者

Japan Association of Mineralogical Sciences

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.71, no.7, pp.183-192, 1976-07-05 (Released:2008-08-07)

参考文献数

3

被引用文献数

3

---

本鉱物は,三波川帯中の各種銅鉱物をともなう蛇紋岩体の割れ目より発見された。細かな針状ないし長柱状をなし,特徴的なsky-blueの色を呈する。構造式(C=1)として, Mn0.019Ni0.231Cu7.770(SO4)3.904(CO3)(OH)6.232・48.4H2O または, (Mn,Ni,Cu)8(SO4)4(CO3)(OH)6・48H2Oをもつ。 本鉱物の光学的性質, X線回折,電子線回折, DTA-TG, IRパターンに見られる諸性質について報告した。また,産状の違いにより, X線回折およびDTAパターンに僅かな違いが見られ,これらについても検討した。 Nakauri, Shinshiro, Aichi Prefecture愛知県新城市中宇利

著者

今野 弘

出版者

Japan Association of Mineralogical Sciences

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.69, no.9, pp.324-331, 1974-09-05 (Released:2008-08-07)

参考文献数

20

---

Quartz crystals of various geologic origins have been irradiated by Co60 γ-rays so that to elucidate the relation between absorption coefficients and the contents of trace elements, especially of Al, Li and K. The absorption maxima perpendicular to the optic axis are at 480nm for natural smoky quartz, 460nm for artificially coloured smoky quartz. A clear correlation was noticed between absorption coefficients (a2-a1) and Al/Li ratio, suggesting that the colouring of smoky quartz is due to Al-Li defects. It was also noticed that K ion plays a negative role in the colouring. As a general tendency, it was noticed that quartz crystals formed under higher temperature conditions, such as those from pegmatites are more readily coloured than those from epithermal veins.

著者

応地 善雄

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.45, no.4, pp.133-136, 1961

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Phenocrystic olivine in picritic basalt from Mishima island and olivine in olivine nodule in trachybasalt from Tsukue island are chemically analysed and are expressed in following chemical formulas:<br> (Mg_1.63 Fe''_0.30 Fe_0.06)_1.99 (Si_0.98 Ti_0.01)_0.99 O_4.00<br> (Mg_1.80 Fe''_0.14 Fe_0.05)_1.99 Si_0.98 O4.00<br> The former is distinctly richer in Fe than the latter. Such difference is attributed to their origin as already discussed by Ross and others.

著者

応地 善雄

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.45, no.3, pp.101-103, 1961

著者

応地 善雄

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.44, no.3, pp.129-141, 1960

被引用文献数

1

---

The Cenozoic volcanic rocks distributed in the Abu district, Yamaguchi Prefecture are divided into the following three groups from geologic relations and petrographic characters: 1) andesites and rhyolites of the calc-alkali rock series in Miocene age, 2) basalts of the tholeiitic series in Pliocene, 3) trachybasalts and trachyandesites of the alkali rock series, and andesites (so called quartz basalt) of the calc-alkali rock series in Quaternary. In this district, Quaternary trachybasalts, trachyandesites, and andesites are widely distributed contrasting to the other two groups. Of these, one of the second group and sixteen of the third are chemically analysed. Abundant quartz xenocrysts and granitic xenolithes are contained in some trachybasalts and trachyandesites, and in all andesites. On the other hand, it is notable that olivine nodules are included in some andesites. These facts are suggestive to consider that andesites are also to have derived from the alkali rock series by the contamination of granitic rocks as already pointed out by several petrologists.

著者

八木 健三

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.63, no.1, pp.30-42, 1970

著者

早川 典久

出版者

Japan Association of Mineralogical Sciences

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.36, no.6, pp.169-176, 1952-12-10 (Released:2008-03-18)

参考文献数

4

---

Geology and sulphur deposit in Uguisu-zawa Mine, situated in the northwestern district of Hanamaki, Iwate Prefecture, Northaest Japan, are described and some considerations on the ore genesis are mentioned. This sulphur deposit consists of some layered ore seams intercalated in mud stone which were formed in the depression caldera of small scale relating genetically to the “Kuzumaru Volcano” already reported. This sulphur deposit has been believed to be the “Lake Deposit Type” but it is more reasonable to consider that it belongs to the “Flowed Sulphur Type” from theviewpoint of the structural and textural features of the ore seams.

著者

早川 典久

出版者

Japan Association of Mineralogical Sciences

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.36, no.5, pp.135-142, 1952-10-10 (Released:2008-03-18)

参考文献数

4

---

1. 葛丸火山の火成活動は,鶯宿岩沢構造線上に生じた陥没地域に,葛丸川上流を中心として行われたもので,葛丸川上流に旧火口を推定することが出来る。 2. 火成活動は第I及び第II期に区分せられ,第I期は石英安山岩活動,第II期は含石英両輝石安山岩活動に屬し,夫々葛根田火山のk1(石英安山岩)及びk2(含石英安即岩)に相当し,葛根田火山に於けると同様に噴出物の性質は酸性より塩基性に向う傾向を示す。 3. 第I期の石英安山岩活動は更にIa~Ieの5期に細分され,各活動期の中間には休止期が存在する。休止期には陥没湖沼中に凝灰質泥岩層乃至砂礫層を沈積する。 4. 陥没湖沼はIa期よりId期初頭迄は存在したことが考えられるが,Id期中に全体が陸化し, Id期と1e期の間の休止期には局部的な,小陥波が起つて,硫黄鉱床が生成されている。 5. 第I期石英安山岩活動の噴出物の性質は葛丸火山全体を通じて示される傾向と同様に酸性から塩基性に向う性質を示す。

著者

八木 健三 茅原 一也

出版者

Japan Association of Mineralogical Sciences

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.49, no.1, pp.22-28, 1963

被引用文献数

1

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男鹿半島南海岸双六部落の凝灰角礫岩中の角礫として,少量ながらコメンド岩が産出する.その地質層準は中部中新世の男鹿層群中の立由崎凝灰岩部層と考えられる.その構成鉱物はサニデイン,石英,アルフェド角閃石,エジリン及び鉄鉱などで,化学組成はSiO2.とNa2Oにとみ,典型的なコメンド岩に属する.これは東北日本におけるコメンド岩の最初の産出で,第三紀火成活動史よりみて,その岩石区的意義を検討した.

著者

南部 松夫 谷田 勝俊

出版者

Japan Association of Mineralogical Sciences

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.65, no.1, pp.1-15, 1971-01-05 (Released:2008-08-07)

参考文献数

14

被引用文献数

6 7

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Chemical analysis of takanelite a new manganese dioxide mincral from Nomura mine, Ehime Prefecture gave; MnO270.39, MnO 13.06, MgO 0.22, CaO 2.66, BaO none, Na2O 0.05, K2O 0.05, Fe2O3 1.34, Al2O3 1.70, TiO2 trace, SiO2 3.61, H2O(+) 4.92, H2O(-) 2.22, sum 100.22%. After deducting Al2O3, SiO2, Fe2O3, H2O(-) and a part of H2O(+) (present as halloysite, goethite and quartz), it corresponds to (Mn+20.89 Ca0.23 Mg0.03)1.15 Mn+43.94 O9.00 1.3H2O as O=9, or ideally (Mn+2, Ca) Mn4+4O9•nH2O with Mn+2〉Ca and n=1.3. This is the Mn+2 analogue of rancieite, (Ca, Mn+2) Mn+44O9•nH2O with Ca〉Mn+2 and n=3. Electron microprobe analyses of five different grains, using analysed rancieite, nsutite and todorokite as standards, gave Mn 60.5-62.3 and Ca 2.0-2.4, and Fe, Al and Si were not detected. These results validate the above analysis and deduction of impurities. Analyses of some other materials suggest the possible existence of a continuous solid solution series between rancieite and this mineral. X-ray powder data are very similar to those of rancieite by Sorem and Gunn (1967) and by Richmond, Fleischer and Mrose (1969), and includes the strongest lines 7.57 (100) (1010), 4.43 (10b) (0002, 1120), 3.76 (25) (2020), 2.462 (15) (1123), 2.349 (20) (2023), 2.065 (10) (2133), 1.754 (7) (2243, 1015), 1.420 (17) (5052, 4260, 1126). The indexing is based on the hexagonal cell with a0=8.68Å, c0=9.00Å, Z=3. Colour steel gray to black, luster submetalic to dull, streak brownish black, sp. gr. 3.41 (measured on impure material); 3.78 (calculated). Cleavage not observed. Vickers' hardness (load 100g) 480kg/mm2(average). In reflected light, yellowish gray, reflection pleochroism weak with yellowish white to yellowish light gray, anisotropism moderate with polarization colour of yellowish gray to light brownish gray. Etch reactions: HCI (conc.), HNO3(conc.) and H2SO4 (conc.) tarnish slightly grayish brown, H2SO4 (conc. ) +H2O2 (20%) and SnCl2 (sat.) quickly stain black. The mineral occurs as irregular-shaped nodules, 1-15cm across, composed of a microscopic intergorwth with a small quantity of braunite, halloysite, goethite and quartz, in the oxidation zone of the braunite-rhodochrosite-caryopilite bedded deposit at the Nomura mine, Ehime Prefecture, Japan, in low grade metamorphosed cherts of Permian age. The name is for the late Dr. Katsutoshi Takane (1899-1945), the former Professor of Mineralogy, Tohoku University, Sendai, Japan. Type material is preserved at Tohoku University. The mineral and name were approved before publication by the Commission on New Meinerals and Mineral Names, IMA.

著者

砂川 一郎

出版者

Japan Association of Mineralogical Sciences

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.75, no.Special2, pp.55-62, 1980-08-30 (Released:2012-08-03)

参考文献数

19

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Although mineral crystals grow in nature under a broad spectrum of conditions, most natural crystallizations are considered to occur in solution phases, including both high temperature and aqueous solutions. When crystals grow from solution phases, the solidliquid interfaces are essentially smooth, where two dimensional layer-by-layer growth are expected. Judging from growth rates versus supersaturation relation, dislcoation controlled growth is expected for the supersaturation region below σ*, and hopper growth due to twodimensional nucleation mechanism for σ*-σ**, hereas unstable dendritic growth above σ**. Various inhomogeneities in crystals as well as surface microtopographs of crystal OfaOces may appear depending on the growth conditions. It was found on the basis of observati ons on these properties of natural crystals that in most natural crystallization, sprial growth and two-dimensional nucleation mechanisms are predominant mechanisms. This is true not only for crystallization in magma and hydrothermal solutions, but also for crystallization in metasomatic environments. For crystal growth mechanism in regional metamorphic environment, the so-called Ostwald ripening is suggested as principal mechanism, where interstitial solutions play an essential role, and thus the growth is similar to that from solution phases.

著者

大庭 昇 富田 克利 山本 温彦 大迫 暢光 井ノ上 幸造

出版者

Japan Association of Mineralogical Sciences

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.75, no.10, pp.329-336, 1980-10-05 (Released:2008-08-07)

参考文献数

6

被引用文献数

4 5

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With respect to mineral and chemical compositions, microstructure, x-ray powder diffraction and grain-size distribution of volcanic ashes from Sakurajima Volcano, Kyushu, Japan, greyish black-colored “black ashes”, reddish dark grey-colored “red ash” and greyish white-colored “white ash” are compared with one another, and mechanisms of their formation are discussed. Many evidences show that the black ashes came from solidifying lavas, by which the summit crater had been buried, those which were explosively crushed and ejected by gas pressure which was accumulating within the vent. The red ash is considered possible to be a mixture of the preexisted and recent ashes which were affected by alteration due to action by volanic gases. Meantime, the white ash characterized by abundant vesiculated volcanic glasses seems to be that which was ejected continuously from magma which came up to the craters.

著者

杉 健一 久綱 正典

出版者

一般社団法人 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.31, no.6, pp.209-224, 1944 (Released:2018-08-02)

参考文献数

7

被引用文献数

2 5

著者

丸山 茂徳 植田 良夫

出版者

Japan Association of Mineralogical Sciences

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.70, no.2, pp.47-52, 1975-02-05 (Released:2008-08-07)

参考文献数

26

被引用文献数

8 14

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Xenoliths in the Kitomyo ultrabasic body (NS-2.5km, EW-4.5km in width) in Kizawa village, Tokushima Prefecture, are composed of mainly amphibolites, psammitic and basic schists with albite spot, quartzose schists, greenstones and sedimentary rocks, the latter two being derived from country rocks. The mode of occurrence, petrographic features and chemical analyses of garnet, chlorite and amphiboles of the metamorphic rocks are described. Petrographically, the low grade schist xenoliths are quite similar to basic and psammitic schist of the Sanbagawa metamorphic belt, and they are distinct from the Terano metamorphic rocks. But the K-Ar ages of muscovites in psammitic and quartzose schist with albite spot are 402 m. y. and 405 m. y. respectively. The significance of the presence of Sanbagawa-type schists in the ultrabasic body of the Kurosegawa tectonic zone is briefly discussed.

著者

大町 北一郎 鈴木 淑夫 早川 彰

出版者

Japan Association of Mineralogical Sciences

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.39, no.4, pp.154-166, 1955-08-01 (Released:2008-03-18)

参考文献数

5

被引用文献数

2 1

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The field investigations of the iron beach sand deposits along the coast of the Pacific ocean from Mukawa to Horobetsu were carried out in the autumn of 1954. The iron placers occur along many shores and often produce by concentration from an elavated beach. More or less of the iron sands are seen all along many shores of the coast in the district, but the comparatively rich layers have only limited development being restricted mainly to the vicinities of Mukawa, Tomakomai, Shiraoi, Ponayoro, Noboribetsu and Horobetsu in where the last one is noteworthy and is now mined. In general the thickness of iron sand rich layers varies from 5 to 30cm, though that of the layer at Horobetsu reaches 50cm. The size of the magnetite grains is about 0.03mm in average, and the general contents of Fe and TiO2 in the iron sands are 25-45% and 2-5% respectively. The mineral and rock grains associated with the magnetite sand are hypersthene, augite, olivine, hornblende, plagioclase, biotite, quartz, garnet, ilmenite, chromite, andesite, hornfels, radioralian chert, etc. The parent source of these sand garins is probably in the adjacent volcanic rocks though some of them may be ordinarily derived from the older rock series in the Hidaka district.

著者

白水 晴雄 小川 留太郎 田中 信也 宮久 三千年

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.46, no.6, pp.191-195, 1961

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Brucite from Sasaguri occurs as foliated or fibrous aggregates, associating with calcite and yellowish serpentine. H=2.5; S.G=2.475; &omega;=1.562, &epsilon;=1.581. Chemical analysis gives: SiO₂ 0.33, Al₂O₃ 0.08, Fe₂O₃ 1.69, MgO 64.81, MnO 1.10, H₂O(-)0.39, H₂O(+)31.38, total 99.78. X-ray powder data and D. T. A. curve are also given. The mineral seems to have been formed under hydrothermal condition.

著者

宮久 三千年 石橋 澄 足立 富男

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.70, no.1, pp.25-29, 1975

被引用文献数

3

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Malayaite is found in the contact skarn zone of Toroku mine, Miyazaki Prefecture. The crystals are commonly granular to massive shape, but sometime crystals show platy to wedgelike aspect, which reach to 3cm in length. Color is white to greenish gray. Luster is resinous. Fluoluminescence of greenish yellow color is observed, when on ultraviolet ray. The refractive indices are <i>&alpha;</i>=1.764, <i>&beta;</i>=1.784-1.786, <i>&gamma;</i>=1.801 and 2V (+) 84-86.<br> Chemical formula calculated from the analysis is:<br> Ca_0.978Sn_0.980Ti_0.002 Si_1.002O_5.000<br>which is in good accord with Ca (Sn, Ti) SiO_5.000 of sphene-malayaite series.<br> Genetic considerations of ore-forming minerals, and problems of tin-mineral dressing are also discussed in this paper.

著者

松隈 寿紀 宮久 三千年

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.41, no.3, pp.89-97, 1957