検索結果 15708 件
| JaLCDOI | 10.18926/ESR/13928 |
|---|---|
| フルテキストURL | ESR_3_17.pdf |
| 著者 | 鈴木 茂之| |
| 抄録 | In eastern Chugoku area, Paleogene deposits have not been recognized until fission-track dating of so called "Mountain Gravels" was carried out (Suzuki et al. 1995). Two sedimentation events in Paleogene time (27Ma and 34-35Ma) are inferred by the F-T dating Major lithology of the Paleogene deposits in the study area is graved which is mainly composed of subrounded to rounded cobbles. The "Mountain Gravels" were previously thought to be lower Quaternary deposits. The "Mountain Gravels" is associsted with coal bearing mud, sand, gravel and breccia deposits. The breccia deposits is distributed sporadically between the "Mountain Gravels" and basement rocks. The deposits are mainly composed of poorly sorted breccia and associated granitic sands. It is inferred that the breccia deposits are talus deposits. |
| キーワード | Paleogene breccia talus deposits fission-track dating |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 1996-09-20 |
| 巻 | 3巻 |
| 号 | 1号 |
| 開始ページ | 17 |
| 終了ページ | 24 |
| ISSN | 1340-7414 |
| 言語 | 英語 |
| 著作権者 | 岡山大学地球科学研究報告編集委員会 |
| 論文のバージョン | publisher |
| NAID | 120002310338 |
| JaLCDOI | 10.18926/ESR/13927 |
|---|---|
| フルテキストURL | ESR_3_1.pdf |
| 著者 | Daniel K. Asiedu| 鈴木 茂之| 柴田 次夫| |
| 抄録 | Petrographic and geochemical study of sandstones from the Kenseki Formation have shown that the sandstones are compositionally immature. The immaturity is reflected geochemically by their low SiO2 contents (52-66 wt%) and petrographically by low modal percents of quartz and K-feldspar, and high modal percents of plagioclase and volcanic lithic fragmants. The Kensaki sandstones are, however, poor in Na2O (up to 2.1 wt%). Both petrography and geochemistry suggest a heterogeneous source lithologies of acidic and basic volcanics, sedimentary, and ultramafic rocks. Petrographic evidence is supplied by quartz and plagioclase of volcanic origin, acidic volcanic fragments, basic volcanic fragments, volcanic glass, serpentinite fragments and detrital spinel grains. Geochemical evidence is provided by high FeO* (total iron as FeO), MgO, TiO2, CaO and K2O contents. Petrographic and geochemical study of the Kenseki sandstones indicate calc-alkaline oceanic island are provenance. The sediments were locally derived, with Alpine-type ultramafic rocks exposed in the north and volcanic materials of the Akiyoshi Belt supplying the bulk of the detritus. |
| キーワード | Kenseki Formation modal analyses provenance |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 1996-09-20 |
| 巻 | 3巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 16 |
| ISSN | 1340-7414 |
| 言語 | 英語 |
| 著作権者 | 岡山大学地球科学研究報告編集委員会 |
| 論文のバージョン | publisher |
| NAID | 120002310277 |
| 著者 | 彌益 清文| |
|---|---|
| 発行日 | 1993-10 |
| 出版物タイトル | 岡山医学会雑誌 |
| 巻 | 105巻 |
| 号 | 9-10号 |
| 資料タイプ | 学術雑誌論文 |
| 著者 | 椎木 滋雄| 中川 和彦| 佐々木 寛| 山下 裕| 湯村 正仁| 小谷 穣治| 柚木 靖弘| 折田 薫三| |
|---|---|
| 発行日 | 1993-02-27 |
| 出版物タイトル | 岡山医学会雑誌 |
| 巻 | 105巻 |
| 号 | 1-2号 |
| 資料タイプ | 学術雑誌論文 |
| JaLCDOI | 10.18926/ESR/13919 |
|---|---|
| フルテキストURL | ESR_4_41.pdf |
| 著者 | Okamoto Yasuhiko| |
| 抄録 | Kalsilite, a polymorph of KAISiO4 is an end member of nepheline-kalsilite series and the mineral was syn-thesized by hydorhermal methods. The synthetic kalsilite is hexagonal, P63, with a=5.151(5), c=8.690(8) A. The structure was refined by full-matrix least-squares methods to a R-value 0.084, using 373 observed reflections. The obtained structure agrees well with those of the natural and the alkali-exchanged specimens reported in the previous literatures. The oxygen atoms are disordered at two mirror-equivalent sites, constructing the domain structure. The average domain structure shows P63mc symmetry and the strctural relation between the two P63 structure corresponds to the twinning by merohedry. The domain structure was considered to be caused accompanied with the high-low inversion of the kalslite structure. Heating experiments of kalsilite reveal that the X-ray powder pattern changes at 865℃, and that cell dimensions vary discontinuously at this temperature. It was confirmed that kalsilite underwent a displacive transition like those observed in quartz or tridymite. The high-form is refered as 'high-kalsilite', and a possible simulate model is proposed. The structure of the high-kalsilite at 950℃ was refined byfull-matrix least-squares methods to a R-value 0.095, using 115 observed reflections. The high-kalsilite is also hexagonal, P63mc or P63/mmc, with a=5.288(1), c=8.628(5) A at 950℃. The structure almost prefectly coincides with that of the simulated model. Based on the interatomic distances, the distribution of silicon and aluminum atoms is found to be or-dered and the space group is determined to be P63mc. Kaliophilite and the related orthorhombic from, polymorphs of KAISiO4, were synthesized by dry method. The synthetic kaliophilite (kaliophilite-H2) is hexagonal with a=5.17(1), c=8.49(3) A, and the orthorhombic KAISiO4 (kaliophilite-O1) is orthormbic with a=9.01(1), b=15.60(2), c=8.53(4) A. Detailed examina-tion of the obtained powder patterns together with that of simulated model indicates that the kaliophilite-H2 has a disorderd structure of four types of the low-kalsilite. The structure was refined by the X-ray powder pattern-fitting method (Rietvelt method) to a R-value 0.121. |
| キーワード | kalsilite kaliophilite faldspathoid systheses crystal structre |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 1997-09-20 |
| 巻 | 4巻 |
| 号 | 1号 |
| 開始ページ | 41 |
| 終了ページ | 72 |
| ISSN | 1340-7414 |
| 言語 | 英語 |
| 著作権者 | 岡山大学地球科学研究報告編集委員会 |
| 論文のバージョン | publisher |
| NAID | 120002310427 |
| 著者 | 黒田 宗明| 岩垣 博巳| 松原 長秀| 木村 臣一| 野中 泰幸| 根津 真司| 吉永 昌雄| 軸原 温| 日伝 晶夫| 折田 薫三| |
|---|---|
| 発行日 | 1993-02-27 |
| 出版物タイトル | 岡山医学会雑誌 |
| 巻 | 105巻 |
| 号 | 1-2号 |
| 資料タイプ | 学術雑誌論文 |
| JaLCDOI | 10.18926/ESR/13917 |
|---|---|
| タイトル（別表記） | Ferroglaucophane schist from the Ohsa-yama srea, Okayama Prefecture, Japan |
| フルテキストURL | ESR_4_33.pdf |
| 著者 | 野坂 俊夫| |
| 抄録 | A ferroglaucophane schist occurs in fault contact with serpentinites at the Ohsa-yama area, Southwest Japan. It consists of albite, ferroglaucophane and actinolite with small amounts of stilpnomelane, sphene, apatite and K-feldspar. Petrological studies reveal that the schist was originally igneous rock of felsic or intermediate composition and has suffered two stages of metamorphism : ferroglaucophane has been formed at the first stage and actinolite at the second stage. In a basic schist from the same outcrop that the ferroglaucophane schist occurs, tremolitic amphibole instead of alkali amphibole has been formed along with chlorite, phengite and albite. Such a difference in mineral association between the schists is ascribed to a difference in whole rock composition, particu-larly in Fe/Mg ratio. Some of the schists from th Ohsa-yama area characteristically contain glaucophane or ferroglaucophane and have low Fe2O3/FeO ratios, forming a striking contrast to the crossite schists that commonly occur in the so-called "Sangun metamorphic terrane". These facts suggest that the alkali amphiboles of the Ohsa-yama schists were formed under higher P/T and more reducing conditions than those of the regional metamrphic rocks. On the other hand, development of the second-stage actinolite in the ferroglaucophane schist is consistent with the meta-morphic parageneses of greenschists from adjacent areas. Consequently the ferroglaucophane schist is considered one of the tectonic blocks that were captured by mobile serpentinites and have suffered the regional metamor-phism after the emplacement of the serpentinites into the present geologic position. |
| キーワード | ferroglaucophane petrology tectonic block serpentinite high P/T metamorphism, Ohsa-yama Sangun metamorphic terrane Southwest Japan |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 1997-09-20 |
| 巻 | 4巻 |
| 号 | 1号 |
| 開始ページ | 33 |
| 終了ページ | 40 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 著作権者 | 岡山大学地球科学研究報告編集委員会 |
| 論文のバージョン | publisher |
| NAID | 120002310538 |
| 著者 | 田中 聖了| |
|---|---|
| 発行日 | 1993-08 |
| 出版物タイトル | 岡山医学会雑誌 |
| 巻 | 105巻 |
| 号 | 7-8号 |
| 資料タイプ | 学術雑誌論文 |
| JaLCDOI | 10.18926/ESR/13912 |
|---|---|
| フルテキストURL | ESR_5_17.pdf |
| 著者 | 山本 雅弘| 加瀬 克雄| Harada, Kaori| |
| 抄録 | Sulfur isotope rations of sulfide minerals in the ore specimens from the deposit of the Tsuchikura mine are distrib-uted in a range from -0.8 to 5.4%, mostly from +0.5 to 3.0%, close to the previous data (from +1 to +3%) by Miyake and Sasaki (1980). The distribution range is also similar to the major Besshi-type deposites of the Sambagawa terrain. Sulfur isotope fractionation between coexisting pyrite and chalcopyrite is not uniform. This may be largely due to spatial tearrangament of the initial orebodies to the present form. Sulfide minerals mostly pyrite from host rocks (siltsones, sandstones, basaltic rocks) exhibit remarkably low δ34S values ranging from -49.3 to -2.6%, dis-tinctly different from the δ34S values for sulfide minerals of ores. The low δ34S values may indicate the bacteriogenic origin of host rock sulfides, although it seems peculiar that basaltic rocks also have extremely low δ34S values. |
| キーワード | Sulfur isotope ratio Besshi-type deposit Tsuchikura mine Pyrite Chalcopyrite |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 1998-09-20 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 17 |
| 終了ページ | 22 |
| ISSN | 1340-7414 |
| 言語 | 英語 |
| 著作権者 | 岡山大学地球科学研究報告編集委員会 |
| 論文のバージョン | publisher |
| NAID | 120002310378 |
| 著者 | 佐藤 恭| |
|---|---|
| 発行日 | 1993-02-27 |
| 出版物タイトル | 岡山医学会雑誌 |
| 巻 | 105巻 |
| 号 | 1-2号 |
| 資料タイプ | 学術雑誌論文 |
| JaLCDOI | 10.18926/ESR/13906 |
|---|---|
| タイトル（別表記） | Peat bed of Jomon age in Desaki Beach, Tamano City, Okayama Prefecture |
| フルテキストURL | ESR_6_23.pdf |
| 著者 | 鈴木 茂之| 行基 幸一| |
| 抄録 | Peat bed remains isolated in the shoreline of western beach of Desaki peninsula. Collected samples gave radiocarbon data of 5790±80 and 5810±60 years BP. |
| キーワード | Peat Holocene Desaki Beach |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 1999-09-20 |
| 巻 | 6巻 |
| 号 | 1号 |
| 開始ページ | 23 |
| 終了ページ | 28 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 著作権者 | 岡山大学地球科学研究報告編集委員会 |
| 論文のバージョン | publisher |
| NAID | 120002310593 |
| JaLCDOI | 10.18926/ESR/13905 |
|---|---|
| タイトル（別表記） | Measurements of CO2 in air and sea over the Western Pacific-MR98-04 Cruise- |
| フルテキストURL | ESR_6_13.pdf |
| 著者 | 河野 雄彦| 山下 栄次| 野上 晃正| 塚本 修| |
| 抄録 | It is well known that the ocean plays a very important role in the overall geochemical cycle of CO2. Over the ocean surface, CO2 is equilibrated between partial pressure of CO2 in the seawater (pCO2) and that in the atmosphere(PCO2). The objectives of the present observation are to evaluate the following : (1) Horizontal distribution of pCO2 and PCO2, (2) Sea surface CO2 flux and (3) Vertical distribution of pCO2. |
| キーワード | Western Pacific pCO2 PCO2 Horizontal distribution CO2 flux Vertical distribution |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 1999-09-20 |
| 巻 | 6巻 |
| 号 | 1号 |
| 開始ページ | 13 |
| 終了ページ | 22 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 著作権者 | 岡山大学地球科学研究報告編集委員会 |
| 論文のバージョン | publisher |
| NAID | 120002310525 |
| 著者 | 佐藤 恭| |
|---|---|
| 発行日 | 1993-02-27 |
| 出版物タイトル | 岡山医学会雑誌 |
| 巻 | 105巻 |
| 号 | 1-2号 |
| 資料タイプ | 学術雑誌論文 |
| JaLCDOI | 10.18926/ESR/13899 |
|---|---|
| フルテキストURL | ESR_7_27.pdf |
| 著者 | 逸見 千代子| 草地 功| Kagetama Tatsuya| |
| 抄録 | The clinopyroxenes of the hybrid rocks from the Hirata outcrop, Kushiro, Hiroshima Prefecture, Japan are grouped into(1)diopside, (2)aegirine, and (3)zoned pyroxene. The diopside occurs as isolated crystals enclosed in feldspars. The aegirine occurs along with late hydrous minerals in pore spaces. The zoned pyroxenes occur as discrete cryatals with wide rims growing interstitially between feldspar laths and show a continuous composition-al trend from diopside through hedenbergite and aegirine-augite to aegirine or titanian aegirine. The pyroxenes enclosed in feldspars and the cores of the zoned crystals have nearly same chemical composition. The late stage pyroxenes are characterized by extreme enrichment of sodium and sometimes titanium. The titanian aegirines studied hera are characterized by the predominance of the Na(Fe2+, Mg)0.5Ti0.5Si2O6 component over other Ti-bearing pyroxene components. The compositional trend of clinopyroxenes from the Hirata hybrid rocks follows a typical trend of peralkalne rocks. The peralkaline neture of the Hirata samples is a result of compositional change of magma accompanied by the metasomatic skarn formation. |
| キーワード | aegirine aegirine-augite diopside pyroxene hybrid rock skarn |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2000-09-20 |
| 巻 | 7巻 |
| 号 | 1号 |
| 開始ページ | 27 |
| 終了ページ | 34 |
| ISSN | 1340-7414 |
| 言語 | 英語 |
| 著作権者 | 岡山大学地球科学研究報告編集委員会 |
| 論文のバージョン | publisher |
| NAID | 120002310313 |
| 著者 | 慈性 隆義| |
|---|---|
| 発行日 | 1994-12 |
| 出版物タイトル | 岡山医学会雑誌 |
| 巻 | 106巻 |
| 号 | 11-12号 |
| 資料タイプ | 学術雑誌論文 |
| 著者 | 山縣 浩一| |
|---|---|
| 発行日 | 1993-08 |
| 出版物タイトル | 岡山医学会雑誌 |
| 巻 | 105巻 |
| 号 | 7-8号 |
| 資料タイプ | 学術雑誌論文 |
| JaLCDOI | 10.18926/ESR/13894 |
|---|---|
| タイトル（別表記） | Native gold from Mikawa mine, Niigata Prefecture, Japan |
| フルテキストURL | ESR_7_19.pdf |
| 著者 | 山川 純次| 田邊 満雄| 島田 和昌| 逸見 千代子| |
| 抄録 | Native gold was found at Mikawa mine, Niigata Prefecture, Japan. The mineral was associated with quartz in a druse within quartz-vein in propyrite. The crystals were formed in filiform, reticulated and dendritic shapes with about 1 mm length with 0.1 mm width and 0.05 mm thickness. Very malleable and ductile, opaque and yellow with metallic luster. Qualitative and semi-quantiative analyses were performed by the wavelength dispersive EPMA. Quantitatively, the crystals contained Au, Ag and Hg. Semi-quantitative analyses were executed with ZAF correction algorithm. The results showed that these specimens had a average chemical composition Au0.77 Ag0.11Hg0.12. This specimen was archived at our site with a collection number ESO-M01001. |
| キーワード | Native Gold Mikawa Mine electrum ESO-M01001 |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2000-09-20 |
| 巻 | 7巻 |
| 号 | 1号 |
| 開始ページ | 19 |
| 終了ページ | 20 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 著作権者 | 岡山大学地球科学研究報告編集委員会 |
| 論文のバージョン | publisher |
| NAID | 120002310280 |
| 著者 | 山本 貴子| Akhmad, Sabarudin| 野口 修| 高柳 俊夫| 大島 光子| 本水 昌二| |
|---|---|
| 発行日 | 2006-11-17 |
| 出版物タイトル | 分析化学 |
| 巻 | 55巻 |
| 号 | 9号 |
| 資料タイプ | 学術雑誌論文 |
| JaLCDOI | 10.18926/ESR/13888 |
|---|---|
| タイトル（別表記） | Relationship between the water quality of three main rivers and geology of Okayama Prafecture |
| フルテキストURL | ESR_8_1_29.pdf |
| 著者 | 木下 卓也| 松田 敏彦| |
| 抄録 | Concentrations of inorganic major components (Ca2+, Mg2+, Na+, K+, ΣFe, AI3+, HCO3, SO4, CI-, NO3, F- and SiO2) were measured in 57 water samples from three main rivers, the Yoshii, Asahi and Takahashi Rivers and their tributaries. The water quality is discussed in relation to the geological environment in the drainage basin of three rivers. The following results were obtained from the investigation. The degree of influence of rocks on the water quality was limestone≫basic rocks>clastic rocks>andesite>rhyolite>gramite. The influence of geology is clear in the riverhead but it is obscure in the downstream. The concentration of each component increases generally from the upper stream to the lower stream but that of SiO2 only decreases in the lower stream. Kaolinite is a stable mineral as a weathering prodouct from the ion compositions of three rivers. In a rough estimation, Yoshii, Asahi and Takahashi Rivers weather 303,000t, 433,000t and 1,033,000t of the rocks respectively from their basins in a year. The syrface of their basins are scraoed off 0.06mm, 0.11mm and 0.15mm respectively in a year. |
| キーワード | Water quality River water Geology of basin Yoshii River Asahi River Takahashi River Okayama Prefecture |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 2001-09-20 |
| 巻 | 8巻 |
| 号 | 1号 |
| 開始ページ | 29 |
| 終了ページ | 38 |
| ISSN | 1340-7414 |
| 言語 | 日本語 |
| 著作権者 | 岡山大学地球科学研究報告編集委員会 |
| 論文のバージョン | publisher |
| NAID | 120002310339 |
| 著者 | 木村 康裕| |
|---|---|
| 発行日 | 1994-12 |
| 出版物タイトル | 岡山医学会雑誌 |
| 巻 | 106巻 |
| 号 | 11-12号 |
| 資料タイプ | 学術雑誌論文 |