著者

北代 吉宏

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.60, no.1, pp.34-45, 1968

---

By diffusion of solid states, pseudowollastonite, forsterite and cristobalite phases are identified.Then silica glass rod is used as silica component. The growth of cristobalite phase is observed, onthe contrary, silicate minerals do not develope according to the increase of diffusion time.<br> The growth of cristobalite depends on heating time, temperature and the kind of oxide component. Thelarger interaction between metallic atom and oxygen, the smaller growth of cristobalite is observed. CaO component promote cristobalitization, compared with MgO. Interaction of Ca-O is smaller than that of Mg-O, therefore diffusion rate of CaO component is larger than that of MgO. Formation of cristobalite depends on the rate of diffusion.

著者

水田 敏夫

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.73, no.7, pp.202-215, 1978-07-05 (Released:2008-08-07)

参考文献数

42

被引用文献数

2 4

---

Peridotites characterized by the texture of elongated olivine crystals, are found in the Higo metamorphic belt mainly composed of psammitic gneiss. The peridotite mainly consists of olivine, orthopyroxene, tremolite, serpentine, and talc. Spinifex-like olivine crystals, partly altered to serpentine and magnetite, consist of randomly oriented plates parallel to (010). The elongated olivine crystals in same handspecimen are chemically homogeneous, and the compositional zonation of the crystals has not been observed by microprobe analysis. However, the chemical composition of olivine ranges from FO83 to FO92 in different handspecimens. The NiO content of olivine varies from 0.2 to 0.5 weight per cent and the MnO content from 0.1 to 0.2 weight per cent. The NiO and MnO contents are about the same as those of komatiitic olivines. On the other hand, the olivines in the Higo perioditite contain a negligible amount of CaO and remarkabIly differ from those of extrusive peridotite (komatiite). The rocks are free from clinopyroxene and contain large and prismatic orthopyroxene. The extremely Ca-depleted orthopyroxenes (En89-En92) are interlocked with tabular olivines in each other. The Al2O, and Cr2O3 contents of orthopyroxenes are relatively lower than those of orthopyroxenes in alpine peridotites. From the mineral assemblages of peridotites and metamorphic rocks, and from the chemical composition of olivine and orthopyroxene, it is suggested that the peridotite bodies suffered from the regional metamorphism of amphibolite facies (approximately 700°C, 3-4kb). This conclusion is also supported by the data concerning Mg-Fe2+ distribution between olivine and chromian spinel in the Higo peridotite.

著者

井上 秀雄 佐藤 和郎

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.46, no.4, pp.133-137, 1961-10-05 (Released:2008-08-07)

参考文献数

9

---

There are three pegmatites in Ryuen mine, Fukuoka Prefecture, which intruded in Masaki granite of the middle Cretaceous. The U-Pb age of uraninite from a pegmatite has been chemically determined as 100×106 years by Kimura and Iimori (1937). Uraninite was collected from the other pegmatite, of which mode of occurrence was different from the above mentioned uraninite. It occurred in chlorite vein cut the pegmatite. In order to know whether or not any measurable time interval existed between the pegmatite solodification and the vein formation, isotopic U-Pb age was determined on the uraninite from the chlorite vein. The age of uraninite is 110×106 years and the formation of chlorite vein continued immediately after the solidification of pegmatite.

著者

友成 才

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.7, pp.267-273, 1974-07-05 (Released:2008-08-07)

参考文献数

6

被引用文献数

1

---

In the central part of Chugoku Province, several types of granitic rocks, presumably of Late-Mesozoic are widely distributed. The granitic rocks in the Fuchu District have been hitherto divided into two types, namely, the Hiroshima granitic complex and the Central plutonic complex. Furthermore, the granites belonging to the latter have been divided into three groups; those of the older, the younger, and the unknown ages. Detailed classification and the relationship among these granitic rocks in the Fuchu District have been left unsolved. From the standpoint of petrographical features such as color of potash-feldspar, volume ratio of minerals, chemical composition and occurrence of xenoliths and dyke rocks, granitic rocks of the district can be divided into four types of complex as follows: (1) Mannari type (2) Ashida type (3) Hirotani type (4) Mikawa type The Mannari type granite belongs to the Central plutonic complex, and the other types to the Hiroshima granitic complex according to the current classification. The Ashida and the Mikawa type granites can be divided into those of coarse, medium, and fine grained ones and the Mannari type granite into coarse and fine members. The Mannari type granite has been intruded by the Mikawa and Ashida type. From the field evidences, the Ashida, the Hirotani, and the Mikawa types are considered to be nearly of the same age. Therefore, the Mannari tvpe granite is thought to be the oldest among these four types.

著者

関 陽太郎

出版者

日本岩石鉱物鉱床学会

雑誌

岩石鉱物鉱床学会誌 (ISSN:00214825)

巻号頁・発行日

vol.60, no.1, pp.27-33, 1968-07

著者

南部 松夫

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.59, no.4, pp.143-151, 1968-04-05 (Released:2008-08-07)

参考文献数

14

被引用文献数

5 7

---

The new mineral akaganeite is beta-ferric oxyhydroxide from the weathered outcrop of the Akagane pyrometasomatic copper-iron deposit in Carboniferous green rock, Iwate Prefecture, Japan. The mineral is the supergene oxidation product of massive pyrrhotite and intimately associated with goethite, melantilite and two kinds of ferric sulfates. The mineral occurs in powdery aggregates of very fine orange to brownish-yellow crystals, elongated [001] and flattened (100) up to 0.3×0.03μ in size under the electron microscope. Two chemical analyses carried out in 1956 and 1959, respectively: Fe2O3 78.23, 80.98; FeO 0.82, 0.23; SiO2 3.10, 3, 57; A12O3 1.21, 1.40; Na2O 0.62, 0.82; K2O 0.19, 0.29; H2O+ 10.20, 9.71; H2O- 4.96, 2.55, sum 99.33, 99.55%. These data correspond closely to FeOOH. Chlorine was detected qualitatively, but material was in sufficient for a quantitative analysis. X-ray powder data are indexed on a tetragonal cell with a=10.50, c=3.03A. The strongest lines are 7.45 (98) (110), 5.31 (48) (200), 3.71 (21) (220), 3.34 (100) (310), 2.361 (33) (400), 2.553 (95) (211), 2.340 (8) (420), 2.300 (43) (301), 2.103 (31) (321), 1.954 ((39) (411), 1.750 (42) (600), 1.720 (12) (501, 431), 1.646 (52) (521), 1.520 (21) (002), 1.456 (28) (640), 1.441 (30d) (1.438), 1.381 (40d) (730, 312). These data agree very closely with the data obtained by Macky (1960), who showed the synthetic β-FeOOH is tetragonal, 14/m, a=10.48, c=3.023A. A DTA curve showed a slight endothermal reaction at about 300°C and a marked exothermal peak at 375°C. The mineral loss 11% in weight to 350°C, nearly all between 250 and 350°C. The name is for the mine. The mineral and name were aproved before publication by the Commission on New Minerals and Mineral Names, IMA. Two short communications on akaganeite have been described in Japanese by the present author (1957, 1960).

著者

小野 晃

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.78, no.1, pp.38-39, 1983-01-05 (Released:2008-08-07)

参考文献数

6

被引用文献数

4 5

---

K-Ar dating on hornblende from biotite-hornblende quartz diorite in northeastern part of the Kanto Mountains was carried out. The age of the quartz diorite is 251±8 Ma. The result, together with geological facts, supports the idea that island arc composed of granitic plutons was present between the Sanbagawa and the Ryoke metamorphic belts.

著者

斎藤 洋彦

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.67, no.5, pp.158-165, 1972-05-05 (Released:2008-08-07)

参考文献数

12

---

The Kabasawa placer deposit is categorized as one of the Pliocene ilmenite placer deposit and its sedimentary and conservative environment is controlled by warping movement of the Okubushi line. the purpose of this paper lies in the research of such elements which influenced the deposition of the Kabasawa placer deposit characteristics relating to type of movement, behavior and development stage of the Okubushi line made during the Pliocene era. The Okubushi line consists of combinations of cross structure of NW and NE branches meeting at tangent angles to each other which reflects the tectonics in the basement of this area. Of these, the NW brach plays a main role in the tectonic movement. The NW branch of Okubushi line controlled the deposition in Pliocene Sendai Group as well as Pliocene sedimentary basin after making warping movement and bringing about an upheaval on its southwestern side and tilting subsidence on its northeastern side. In other words, the NW branch brought about a differential movement of upheaval and subsidence through the depositional stage of Kameoka and Tatsunokuchi formation and the central part of the past upheaval changed into a depressional tilting subsidence at the depositional stage of Kitayama formation. Finally, the NW branch terminated its geologic movement with the eruption of tuff (acidic volcanic deposits) at the depositional stage of Hirosegawa tuff. The Kabasawa sandstone and conglomerate member intercalating Kabasawa ilmenite placer deposit, is a deltaic deposit which was piled up upon the region of depressional tilting subsidence during the depositional stage of Kitayama formation. It forms a circle of 2km diameter and has an extraordinary thick stratum. It is generally believed that the movement in the NW branch of Okubushi line is the result of a tectonic movement, referred to as “Green Tuff Crustal Movement”, in full activity during the Miocene era and succeeded to the Pliocene era in the northeastern part of Japan.

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

苣木 浅彦 島 敞史 北風 嵐

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.73, no.3, pp.63-77, 1978-03-05 (Released:2008-08-07)

参考文献数

40

---

To reconfirm whether minerals of luzonite-famatinite series form complete solid solution between them as Springer (1969) reported or limited solid solution having immiscibility gap from approximately 10 to 40 mol% Cu3SbS4 as Skinner (1960) inferred. 16 samples of luzonite and famatinite from 7 mines in Japan, Formosa and Philippines were examined by electron probe microanalyser (EPMA). The quantitative analytical data by EPMA for the samples are given in Tables 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 and 13. The specimens from the Hokuetsu mine, Japan and the Mankayan mine, Philippines have most nearly stoichiometric composition of luzonite as from 0 to 3 mol% Cu3SbS4. They from the Lobo mine, Philippines and the Kinkaseki mine, Formosa have from 2 to 12 mol% Cu3SbS4, and from 2 to 7 or 36 to 41 mol% Cu3SbS4 in composition, respectively. Also luzonite-famatinite series minerals from the Teine, Kasuga and Akeshi mines, Japan have compositions of such wide range as from 19 to 71, 26 to 82 and 3 to 78 mol% Cu3SbS4, respectively. However, the composition corresponding to stoichiometric Cu3SbS4 of famatinite was not found during this study. Analytical data for 378 points in 16 specimens are summarized as shown in Fig. 5, and it is found that there is existance of minerals having continuous compositions between luzonite and famatinite except nearly famatinite end. Therefore it is concluded that the complete solid solution between them exists at low temperature as the result of Springer's examination.

著者

原田 一雄 児玉 秀臣

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.3, pp.115-118, 1963-03-05 (Released:2008-08-07)

参考文献数

6

---

A new occurrence of freibergite from the Chichibu Mine is described. The freibergite, which was found from the upper part of the Daikoku ore deposits, associated with pyrite, euhedral crystal of chalcopyrite, bornonite, ankerite and quartz. Mineralogical properties of the mineral are as follows; 1. euhedral, tetrahedral crystal about 1cm in diameter. 2. streak color, reddish brown. 3. ao=10.435A. 4. the spectrochemical analysis shows the presence of the major amounts of Cu, Ag and Sb, minor amounts of Fe, As and Si, and trace of Zn, Pb and Cd.