検索結果 7200 件
| JaLCDOI | 10.18926/ESR/13947 |
|---|---|
| フルテキストURL | ESR_2_71.pdf |
| 著者 | Frank k, Nyame| 加瀬 克雄| 山本 雅弘| |
| 抄録 | X-ray diffraction, ore microscopy, and electron microprobe studies have been done on ore samples obtained from the mine site at Nsuta, Ghana. Manganese ore minerals identified include nsutite, cryptomelane, pyrolusite, and lithiophorite. Except for pyrolusite, all these minerals are poorly crystalline. Chemical compositions of the minerals indicate little contamination by other elements. Quartz, muscovite, and clay minerals feature prominently as gangue in most samples. Textures are varied, and modes of occurrence are prinicipally by replacements, cavity or fracture fills, leaching and precipitaion. Mineral associations seem rather complex, as a result of which definitive paragenetic relations could not be established. Supergene formation of the manganese oxide ore is shown by the abundance of manganese minerals in solution channels such as fractures and cavities within silicate gangue. Much of the ore, howver, appears to have been enriched by leaching of gangue minerals and the later addution of manganese. |
| キーワード | Nsuta nsutite cryptomelane pyrolusite lithiophorite |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 1995-09-20 |
| 巻 | 2巻 |
| 号 | 1号 |
| 開始ページ | 71 |
| 終了ページ | 80 |
| 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 | 120002310527 |
| JaLCDOI | 10.18926/ESR/13945 |
|---|---|
| タイトル（別表記） | solubility and polymerization of silica in salt solutions |
| フルテキストURL | ESR_2_63.pdf |
| 著者 | 杉田 創| 山本 雅弘| |
| 抄録 | The solubility of amorphous silica was determined in sodium chloride,potassium chloride, magnesium chloride and calium chloride solutions from 0.01 to 1moI/I and at temperatures of 21,36,50 and 65℃. The Setchenow equation was applied to the results, which enabled us to estimate the equilibrium concentration of "dissoloved silica" (molybdate-reactive silica) in the studied chloride solutions. Next, the effects of pH, supersaturation of silica and salt concentration on the polymerization rate of silica were investigated at 35℃. In the pH range from 6.4 to 7.9, the maximum polymerization rate increased with increasing pH. The maxima occurred when dissoloved silica decreased by 25% of the initial supersaturation concentrations irrespective of pH. The polymerization rate was found to be dependent on the supersaturation degree rather than on the supersaturation concentration of silica. The results in magnesium chloride solutions suggest that magnesium ions may act as nuclei in the formation of colloidal silica in geothermal waters. |
| キーワード | amorphous silica solubility polymerization |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 1995-09-20 |
| 巻 | 2巻 |
| 号 | 1号 |
| 開始ページ | 63 |
| 終了ページ | 70 |
| 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 | 120002310447 |
| JaLCDOI | 10.18926/ESR/13943 |
|---|---|
| タイトル（別表記） | Water-soluble materials on volcanic ash from the 1990-94 eruption of the Unzenn volcano |
| フルテキストURL | ESR_2_55.pdf |
| 著者 | 赤木 誠司| 山本 雅弘| |
| 抄録 | Water-soluble materials on volcanic ash from the Unzen volcano collected from February, 1991 to July, 1994 were chemically analyzed. They were similar in chemical characteristics to those obtained from other volcanoes. Chemical compositions varied even for materials from the same pyroclastic flow. C1 contens increased with increasing residence time of volcanic ash in air, but SO4 contents were almost fixed. It therefore seems that the reaction of volcanic ash with HC1 proceeds even at low temperatures, whereas the reaction with SO2 takes place only at high temperatutes. |
| キーワード | volcanic ash volcanic gas Unzen volcano C1/SO4 ratio water-soluble material |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 1995-09-20 |
| 巻 | 2巻 |
| 号 | 1号 |
| 開始ページ | 55 |
| 終了ページ | 62 |
| 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 | 120002310484 |
| JaLCDOI | 10.18926/ESR/13941 |
|---|---|
| タイトル（別表記） | A suggestion on the origin of biotite gneisses of the Ryoke belt in the Seto Inland Sea (Seto-nai-kai) region : Some biotite gneisses were derived from a different geologic unit to the Kuga froup |
| フルテキストURL | ESR_2_23.pdf |
| 著者 | 濡木 輝一| |
| 抄録 | The Kuga group is a Jurassic accretional complex that has been believed by many workers to be a unique geologic unit transformed into the Ryoke gneisses in the Seto Inland Sea region. I will now suggest the presence of a different geologic unti in addition to the Kuga group. Most of the biotite gneisses found at the Iwakuni-Yanai area are probably derived from rocks of the Kuga group, but the rest biotite gneisses that occur in the Murotu Peninsula, the Yashiro-jima, the E-no-shima, and the other several islands in the Seto Inland Sea region were derived from a un-known and a different geologic unit to the Kuga froup. Some pieces of evidence proving the distinct origin of the latter biotite gneisses are: (1) the biotite gneisses commonly occur as small to large fusiform bodies generally enclosed in the older Ryoke granite or as large masses contacting only with the older Ryoke granite; (2) tight folds with parallel axial surfaces are very common, and dupli-cated fold systems are found in many localities; (3) microtextures of some minerals, e.g. garnet and K-feldspar, often suggest a plural metamorphic history of the gneisses (Nuraki et al., 1982a; Miyashita % Komatsu,1993); and (4) the sillimanite zone (Ikeda,1991 : Okudaira et al.,1993) is only a metamorphic zone that can be found. The sillimanite zone is interpreted to be excluded from the progressive metamorphism in the Iwakauni-Yanai area (Wallits et al.,1992). Biotite gneisses of the sillimanite zone are found here and there and show no zonal arrangement of distribu-tion in the Ryoke belt. The estimated metamorphic temperature and pressures for the biotite gneisses of the silliman-ite zone are 530-710℃ and 2-4kb respectively, both of which are lower than of the peak metamorphism, estimated as 550-820℃ and 5-6kb, at the Iwakuni- Yanai area. |
| キーワード | Kuga group Ryoke belt biotie gneisses Sillimanite Zone Iwakuni-Yanai area |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 1995-09-20 |
| 巻 | 2巻 |
| 号 | 1号 |
| 開始ページ | 23 |
| 終了ページ | 54 |
| 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 | 120002310501 |
| JaLCDOI | 10.18926/ESR/13940 |
|---|---|
| タイトル（別表記） | Application of the remotely operated TV vehicle to make geological maps of the Seto Inland Sea |
| フルテキストURL | ESR_2_13.pdf |
| 著者 | 鈴木 茂之| 稲田 孝司| |
| 抄録 | Submarine geological survey using the remotely operated TV vehicle (RV100), was carried out in 4 offshores of the Seto Inland Sea in Kagawa Prefecture. The study areas are west of Kosei Island of Sakaide City, south of Okado-bana of Nankai Town, west of Misaki of Takuma Town and north of Nou-Misaki of Sakaide City. TV vehicle transmite clear pictures of bottom of the sea to the monitor on board. The submarine geology of the study areas are composed of Cretaceous granitic basements and Quaternary sedimentary covers. By using these pictures Recent and Pleistocene deposits could be distinguished and lithology of sediments could also be identified. Lithology of sediments was however difficult to identify using the usual sonic prospecting method. Furthermore, pictures suggesting that ripples are just forming have been obtained. The TV vehicle is convenient in submarine survry, because it can travel much longeer and deeper than human diver. A new method of mapping submarine geology using TV vehicle was developed. |
| キーワード | Submarine geology the Seto Inland Sea remotely operated TV vehicle |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 1995-09-20 |
| 巻 | 2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 | 120002310382 |
| JaLCDOI | 10.18926/ESR/13937 |
|---|---|
| タイトル（別表記） | A microcomputer-controlled gradual cooling system for hydrothermal reactors |
| フルテキストURL | ESR_3_65.pdf |
| 著者 | 山川 純次| 河原 昭| |
| 抄録 | A used 8 bit microcomputer is applied for an instrument of controlling the heating temperatures of hydrothermal reactor furnaces. The temperatures were changed into appropriate values of voltage by thermocouples and additional devices. The interface board, programmable peripheral interface LSI and some IC's for addres decording are assembled into a complte unti. The device is useful for the inexpensive way of the construction of the accurate temperature control system. |
| キーワード | hydrothermal synthesis cooling system personal computer |
| 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 | 65 |
| 終了ページ | 70 |
| 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 | 120002310682 |
| JaLCDOI | 10.18926/ESR/13933 |
|---|---|
| タイトル（別表記） | Sulfur isotope ratios of some Roseki deposits in the Inner Zone of Southwest Japan |
| フルテキストURL | ESR_3_43.pdf |
| 著者 | 山本 雅弘| 松田 敏彦| 中川 頼記| |
| 抄録 | Sulfur isotope ratios of pyrite and alunite from 5 Roseki deposits in the Inner Zone of Southwest Japan were determined. The δ34S values of all pyrite samples were in the range from -13.2 to +2.3%, the variation range for each deposit being within 8%. In each deposit δ34S values of alunite were always higher than those of pyrite, which may be interpreted as that alunite was precipirated under more oxidizing conditions than pyrite. Sulfur isotope rations of the Roseki pyrite showed a distribution similar to that of ore sulfur from skarn and vein deposits in the same Zone. This suggests that the origin of sulfur of the Roseki deposits is also host igneous rocks. |
| キーワード | sulfur isotope ratio Roseki deposit pyrite alunite |
| 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 | 43 |
| 終了ページ | 46 |
| 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 | 120002310309 |
| JaLCDOI | 10.18926/ESR/13931 |
|---|---|
| タイトル（別表記） | Inversion of normal mode frequencies for estimation of lateral heterogeneity of the earth's elasticity atructure: A numerical test |
| フルテキストURL | ESR_3_33.pdf |
| 著者 | 大西 星司| 小田 仁| |
| 抄録 | An investigation was made on effect of lateral heterogenity of the earth's elasticity structure on the normal mode frequencies. The lateral heterogeneity is expressed by an expansion of spherical harmonic functions, Pιm(cosθ)sinmΦ and Pιm(cosθ)cosmΦ, up to the second order harmonics (ι≤2). Free oscillation freguencies of the heterogeneous earth were computed by the xyz algorithm. Further we derived an analytic expression of partial derivatives of eigenfrequency with respect to the expansion coefficients, and performed a numerical test to verify whether or not it is possible to estimate the heterogeneity of the earth's structure by the inversion of noemal mode frequencies. When the earth is assumed to be elastically isotropic spheroid with short polar and long equatorial radii, frequency spectra affected by longitudinal heterogeneity terms, Pιm(cosθ)(sinmΦ, cosmΦ) (m≠ 0), for given values of ι and m coincide with each other, because these two terms describe the same heterogeneity when the earth is rotated by π/2m around rotation axis. In such a case, we cannot determine accurately the expansion coefficients of tha two heterogeneity terms by inversion of normal mode frequencies, whereas the coefficients of the latitudinal heterogeneity Pι0(cosθ) can be precisely determined. Therefore it is difficult to estimate of lateral heterogeneity of the earth's elasticity structure by the inversion of normal mode frequencies. |
| キーワード | Normal Mode Inversion Earth's Structure Lateral Heterogeneity |
| 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 | 33 |
| 終了ページ | 42 |
| 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 | 120002310694 |
| 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 |
| JaLCDOI | 10.18926/ESR/13916 |
|---|---|
| タイトル（別表記） | Landslide occurrence and geology of the Triassic Nariwa Group, Southwest Japan |
| フルテキストURL | ESR_4_21.pdf |
| 著者 | 宝谷 周| 鈴木 茂之| 田中 元| 山田 琢哉| |
| 抄録 | Geological and topographical study of landslides in the Triassic Nariwa Group has been carried out. Nariwa Group is mostly composed of non-marine deposites and is characterized by cycle of fining upward successions. Landslides abundantly occur in the non-marine successions. Slip surface occure in coaly mudstones that have conspicuously less strength than sandstones. Creeps immediately below slip surfaces contribute to the occurrence of landslides in the Nariwa Group. |
| キーワード | Iandslide Nariwa Group coaly mudstone |
| 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 | 21 |
| 終了ページ | 32 |
| 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 | 120002310343 |
| JaLCDOI | 10.18926/ESR/13915 |
|---|---|
| タイトル（別表記） | Three-dimensional structure of P wave velocity in the crust and upper mantle beneath southwest Japan |
| フルテキストURL | ESR_4_1.pdf |
| 著者 | 田中 猛士| 小田 仁| |
| 抄録 | Trevel-time data of the P wave were inverted to study three-dimensional structure of the P wave velocity in the upper mantle and crust beneath the Shikoku and Chugoku districts, southwest Japan. Low-velocity and high-velocity regions were found in the upper crust of the eastrn and western regions in the Shikoku district, respectively. The activity of crustal earthquakes is high in the eastern region. Moreover a significant high-velocity region exists in the uppermost mantle, where the activity of small earthquakes is very high. A low-velocity region with velocity of 7.0km/s was found just above the descending Philippine Sea plate with high velocity of 8.0 km/s. This region is continued to oceanic crust in the vicinity of the Nankai trough and its velocity is nearly equal to the P wave velocity (6.7 km/s) of oceanic crust. Thus the low velocity is interpreted as the oceanic crust. A high-velocity region is found below the depth of 50km in the Shikoku district. This region suggests the Philippine sea plate lying horizontally from the Shikoku districts to the ocast of the Seto Inland Sea of the Chugoku district. A low-velocity zone suggesting the volcanic front is found around the depth of 50km at the coast of the Japan Sea of the Chugoku distrit. |
| キーワード | Three-dimenrsional structure P wave Crust Upper mantle Philippine Sea plate |
| 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 | 1 |
| 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 | 120002310209 |
| JaLCDOI | 10.18926/ESR/13911 |
|---|---|
| タイトル（別表記） | (14)C ages of Quaternary deposits in Kojima Lake area, Tamano City, Okayama Prefecture |
| フルテキストURL | ESR_5_13.pdf |
| 著者 | 佐々木 甫| 鈴木 茂之| |
| 抄録 | Two 14C ages are obtained from drilled core samples in Kojima Lake area. One is 7920±250 y.B.P. from peat which is just below silty clay of bay sediments (-14.30-14.61 m) The other is 24900+3450,-2450 y.B.P. from pale milky gray clay of fluvial sediments (-24.15-24.45 m). |
| キーワード | (14)C age Quaternary Kojima Lake area |
| 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 | 13 |
| 終了ページ | 16 |
| 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 | 80011114460 |
| JaLCDOI | 10.18926/ESR/13909 |
|---|---|
| タイトル（別表記） | Topography and deposits of terrace of Yokohama Town, Northeast Japan |
| フルテキストURL | ESR_5_1.pdf |
| 著者 | 鈴木 茂之| 宮脇 明子| |
| 抄録 | Higher, middle and Lower Terraces (Quaternary) have been distinguished in Yokohama Town, Aomori Prefecture. The Higher Terraces are subdivided into three terraces, H1,H2 and H3. They are distributed in hills. H1 and H2 deposites are composed of gravels of fan deposits. H3 deposits are composed of gravels, sands and mud of alluvial plain deposits. The Middle Terraces are subdivided into three terraces, M1, M1' and M2, and occupy almost all terraces in Yokohama Town. These deposits are composed of beach (sand with gravel) and fan (gravel) deposits. The Lower Terraces are subdivided into two terraces, L1 and L2. The L1 Terrace is distributed in limited area along coast and thought to be composed of beach deposits. The L2 Terrace is distributed in limited area along river and composed of braided stream deposits. |
| キーワード | terrace beach deposits fan deposits Quaternary |
| 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 | 1 |
| 終了ページ | 12 |
| 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 | 120002310292 |
| JaLCDOI | 10.18926/ESR/13907 |
|---|---|
| タイトル（別表記） | Chemical and Rb-Sr isotopic features of the shock-melted chondrite Yamato-793533 |
| フルテキストURL | ESR_6_29.pdf |
| 著者 | 岡野 修| 片山 博子| 中村 昇| |
| 抄録 | The Sr isotopic compositions and Rb and Sr abundances, as well as major element abundances in olivine, pyroxenes and glass, were determined for a chip and 21 fractions separated from a shock-melted chondrite Yamato-793533, a dark-colored, porous stone with glassy texture. Two lithologies were recognized for the 1.5g specimen studied (Yamato-793533, 67) ; L (Main portion) and L to LL (Dark portion) chondritic in terms of chemical compositions of olivine and pyroxenes. The chemical compositions of glass are relatively homogeneous (SiO2=67-77%) compared to those of other ordinary chondrites, suggesting a moderate cooling rate after shock-melting. The data points for fractions do not foem any isochron in a 87Rb/86Sr vs. 87Sr/86Sr diagram. However, it is noted that six out of nine points for the dark portion plot around a 1.2 Ga line, while most of points for the main portion plot around a 4.55 Ga chondrite isochron. The observed difference could be responsible for difference in melting degrees between the two portions. Similar Rb-Sr features have been found among shock-melted Yamato-79 LL-chondrites which are considered to be paired stones experienced the same shock-melting event at 1.2 Ga. Consequently, the Rb-Sr systematics as well as petrologic features strongly suggest that Yamato-793533 is a member of a series of the shock-melted Yamato-79 LL-chondrites. |
| キーワード | LL-chondrite Shock-melting Sr isotope |
| 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 | 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 | 120002310391 |
| 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 |
| JaLCDOI | 10.18926/ESR/13901 |
|---|---|
| タイトル（別表記） | Tidal notch cut into the Namigata Limestone, 240m above sea level, Ibara City, Okayama Prefecture |
| フルテキストURL | ESR_7_41.pdf |
| 著者 | 藤原 貴生| 鈴木 茂之| 前田 保夫| |
| 抄録 | The tidal notch and the sea caves which cut into the Namigata Limestone is stiuated in 240m above sea level, Ibara City. The notch assocciates the Namigata Terrace 200m to 240m high. These geomorphological features indicate an event of high sea level. However the age of the event has not been known. |
| キーワード | notch sea cave Namigata Okayama Prefecture |
| 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 | 41 |
| 終了ページ | 46 |
| 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 | 120002310395 |
| JaLCDOI | 10.18926/ESR/13900 |
|---|---|
| タイトル（別表記） | Relashonships between "Mountation Gravels" and the Bizen and Tomihara Coal Measures, northern Okayama City, Southwest Japan |
| フルテキストURL | ESR_7_35.pdf |
| 著者 | 鈴木 茂之| 中澤 圭二| 田中 元| |
| 抄録 | The Bizen and Tomihara Coalfields which were situated in northern Okayama City, had produced lignite during 1940s. Distribution of coal measures indicates that the coal measures are intercalated in the middle of the so-called "Mountain Gravels". The "Mountain Gravels" is subdivided into two formations ; the older, about 34～35Ma, and the younger, about 27Ma, of fission track ages. The older formation inculudes the Bizen Coal Measures. On the other hand, the Tomihara Coal Measures are intercalated in the younger formation. |
| キーワード | Bizen Coal Measures Tomihara Coal Measures Okayama City Paleogene |
| 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 | 35 |
| 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 | 120002310497 |
| JaLCDOI | 10.18926/ESR/13897 |
|---|---|
| タイトル（別表記） | Water-soluble materials formed by the reaction between a volcanic rock and HCI and/or SO2 gases |
| フルテキストURL | ESR_7_21.pdf |
| 著者 | 赤木 誠司| 山本 雅弘| |
| 抄録 | Experiments on the reaction of a volcanic rock, dacite with HCI and /or SO2 gases have been carried out at room temperature to 800℃ for understanding of the condition of the formation of water-soluble materials on volcanic ash. HCI reacted with the dacite mainly at low temperatures (≤200℃), whereas SO2 did at high temperatures (≥400℃). It was also found that CI/SO4 ratios of water-soluble materials were very high at low temperatures, but decreased rapidly with increasing temperature. In the experiments using a mixture of HCI and SO2, the cation composition at 600℃ and 800℃ was revealed to be significantly different from that at lower temperatures, suggesting the change in the reaction process with temperature. |
| キーワード | Volcanic gas Volcanic ash Water-soluble material CI/SO4 ratio |
| 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 | 21 |
| 終了ページ | 26 |
| 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 | 120002310554 |
| 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 |