検索結果 1870 件
| JaLCDOI | 10.18926/ESR/13953 |
|---|---|
| フルテキストURL | ESR_1_9.pdf |
| 著者 | 鈴木 茂之| |
| 抄録 | The Iberian Pyrite Belt is an Upper Paleozoic succession which has been divided into the Phyllite-Quartzite Group, the Volcanic-Sliceous Complex and the Culm Group in ascending order from base to the top. The contacts among them are conformable. These Groups are tightly folded and metamorphosed un-der low-grade conditions during Hercynian times. The first stage folds of the Volcanic-Siliceous Complex and the Culm Group are associate with slaty cleavages (S1), while the Phyllite-Quartzite Group is asso-ciate with schistosities (S1). Fold analysis using cleavages and minoe folds has been utilized in the analysis of the stratigraphy. This led to systematic horizontal collection of specimens (pelitic rocks). S1 texture is defined by paralled alignment of secondary platy minerals which tend to grow larger and together, forming zonal domains toward the Phyllite-Quartzite Group. The clay matrices change to recrystallized quartz toward the Phyllite Quartzite Group. Textural modifications are evidenced by gradational changes from slaty cleavages to schistosities. This shows that recrystallization is the important deformation mecha-nism responsible for S1 development. It also reflects that the deformation was contemporaneous with metamorphism. |
| キーワード | Slaty cleavage Schistosity Recrystallization |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 1994-09-20 |
| 巻 | 1巻 |
| 号 | 1号 |
| 開始ページ | 9 |
| 終了ページ | 18 |
| 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 | 120002310428 |
| JaLCDOI | 10.18926/ESR/13952 |
|---|---|
| フルテキストURL | ESR_1_1.pdf |
| 著者 | 野坂 俊夫| 柴田 次夫| |
| 抄録 | Ultramafic rocks exposed around Mt. Ohsa(= Ohsa-yama), Okayama prefecture, designated as "Ohsa-yama ultramafic body" all together, are one of the Alpine-type peridotites in the Sangun metamorphic belt. They are intensely serpentinized and locally suffered contact metamorphism by younger granitic intrusions. In a por-tion of the ohsa-yama body where it has been affected by the contact metamorphism, the constituent minerals, texture and structure of primary ultramafic rocks have been locally preserved. Petrographic studies revead that the primary ultramafic rocks of the ohsa-yama body consist domimantly of dunite and harzburgite possessing no obvious layering, and their constituent minerals are similar in composition to those of the Tari-Misaka and Ashidachi ultramafic bodies. These features indicate that unlike the Ochiai-Hokubo body, the Ohsa-yama ultra-mafic body belongs to the "massive group" of the Arai's (1980) classification. |
| キーワード | petrography dunite harzburgite massive ultramafic body |
| 出版物タイトル | Okayama University Earth Science Report |
| 発行日 | 1994-09-20 |
| 巻 | 1巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 8 |
| 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 | 120002310594 |
| JaLCDOI | 10.18926/ESR/13950 |
|---|---|
| タイトル（別表記） | System for monitoring the vacuum of X-ray generators (Available use of 8 bit personal computer) |
| フルテキストURL | ESR_2_103.pdf |
| 著者 | 山川 純次| 河原 昭| |
| 抄録 | An used 8 bit personal computer is utilized for an instrument for continuous monitoring of the vacuum valuses of X-ray genrators. The interface board, programmable peripheral interfacial LSI, 8255A and some IC's for address decoding are assembled into a completed unti. The concept of the construction of this interface unti is profitable for the inexpensive layout of experimental laboratories. |
| キーワード | X-ray generator vacuum monitoring personal computer |
| 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 | 103 |
| 終了ページ | 108 |
| 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 | 120002310492 |
| JaLCDOI | 10.18926/ESR/13949 |
|---|---|
| タイトル（別表記） | Rb-Sr age of K-rich LL-chondrite Yamato-74442 |
| フルテキストURL | ESR_2_91.pdf |
| 著者 | 西谷 七代| 岡野 修| 加々美 寛雄| 中村 昇| |
| 抄録 | Yamato-74442, a brecciated LL-group chondrite, consists of fragments with igeous texture, chondrules, mineral fragments, and host. The fragments involve K-rich fragments as well as normal ones. Typically, both fragments consist mainly of euhedral porphyritic olivines and a few orthopyroxenes in a glassy grundmass. EPMA analyses for these fragments indicate that olivines and orthoptroxenes have a range of Fe/(Fe+Mg) ratio of 27.19～31.33 and 20.10～26.91 mol%, respectively. There is no significant difference in these rations between K-rich (Na2O/K2O<1) and normal framents. The K2O contents of groundmass for K-rich fragments range from 0.51 to 4.89 wt% and that of the normal fragments is 0.38～090 wt%. K2O contents of groundmass vary from fragment to fragment but are rather homegeneous in a single fragment. Rb-Sr isotopic determination on eighteen K-rich fragments (1.5 to 9.5mg in weight) gave an internal isochron age of 4.514±0.022 (2σ) Ga (λ87Rb=1.42×10-11y-1) and initial 87Sr/86Sr ratio of 0.7016±0.0024. This age is somewhat old compared with a whole rock isochron age of LL chondrites (4.493±0.18 Ga; Minster and Allegre, 1981). From a comoarison of the present result with others so far reported, it is inferred that the alkali differentiation as observed in Yamato-74442 probably occurred prior to or during a process of accumulation from LL chondrite parent material in the early solar nebula. |
| キーワード | LL-chondrite Rb-Sr age Sr isotope K-rich fragment |
| 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 | 91 |
| 終了ページ | 102 |
| 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 | 120002310270 |
| JaLCDOI | 10.18926/ESR/13948 |
|---|---|
| フルテキストURL | ESR_2_81.pdf |
| 著者 | Osae, Shiloh| 加瀬 克雄| 山本 雅弘| |
| 抄録 | The Ashanti gold deposit at Obuasi occurs in the Early Proterozoic Birimian formation. The orebodies consist of gold-sulphides disseminated in metasediments and metavolcanics, and gold-bearing quartz veins. Gold occurs mainly as native gold normally with arsenopyrite, pyrrhotite and pyrite in the metasediments and metavolcanics. In the quartz veins, however, it is associated with tetrahedrite and sphalerite. Microprobe analysis of gold grains gave an Ag content of about 8 wt.%. Textural relationships among the various mineral associations suggest that pyrrhotite, pyrite, arse-nopyrite and possibly gold may have been formed esrlier in the paragenetic sequence. The precipitation of some amounts of gold may have occurred during the later stages of the mineralisation sequence. Average arsenopyrite composition determined from electron microprobe study is: Fe: 33.6 ± 0.5 at.%, As: 29.3 ± 1.2 at.%, S: 37.1 ± 1.1 at.%, This suggests an average temperature of formation of less than 300℃ for the sulphides and possibly the gold assuming equilibrium was attained between pyrite, pyrrhotite and arsenpopyrite. The δ34S values for sulphide mineral separates are in the range between -4.1 and -10.8%. The values were, however, constrained between -4.1 and -7.0%. The narrow range and the depleted nature of the δ34S values may suggest a sedimentary sourcc of sulphur which may have undergone high temperature homegenisation before deposition. Sulphides from quartz vein samples had the most depleted δ34S values. This may indicate a different mineralisation history of the sulohides in the quartz veins from those dissemi-nated in metasediments and metavolcanics. |
| キーワード | Birimian Ashanti gold arsenopyrite |
| 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 | 81 |
| 終了ページ | 90 |
| 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 | 120002310561 |
| 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 |
| 著者 | 村上 政江| |
|---|---|
| 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 |
| 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/13938 |
|---|---|
| フルテキストURL | ESR_2_1.pdf |
| 著者 | 野坂 俊夫| 柴田 次夫| |
| 抄録 | The Ohsa-yama ultramafic body, which consists of several types of serpentinized peridotites, underwent contact metamorphism caused by a Cretaceous granite intrusion ; this metamorphism resulted in the formation of contact aureole, 1.5-2.0 km wide, around the granite intrusion, and produced progressive mineral changes in metaserpentinites toward the contact between the Ohsa-yama body and the granite intrusion. On the basis of analysis of mineral paragenetic relations, the Ohsa-yama ultramafic body can be divided into three zones with progressive changes in mineral assemblages as follows : Zone Ⅰ : serpentine ± chlorite ± brucite Zone Ⅱ : olivine + talc ± tremolite ± chlorite Zone Ⅲ : olivine + orthopyroxene ± tremolite ± spinel Zone Ⅰ corresponds to the parts unaffected by the thermal event, and Zones Ⅱ and Ⅲ correspond to the thermally metamorphosed parts of the Ohsa-yama body. The results obtained in this study are generally consistent with those of the previous studies on metamorphic peridotites from the Sangun and Muzuru zones. |
| キーワード | peridotite serpentinite thermal metamorphism contact metamorphism |
| 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 | 1 |
| 終了ページ | 12 |
| 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 | 120002310611 |
| 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/13936 |
|---|---|
| フルテキストURL | ESR_3_57.pdf |
| 著者 | Okamoto Yasuhiko| 河原 昭| |
| 抄録 | The syntheses of kaliophilite have been carried out from the starting materials of near kalsilite compotions (KAISiO4), of which the AI2O3/SiO2 ratio is greater than 1/2. The X-ray powder deffraction pattern fit well to those of previous investigators. The crystal structure of synthetic kaliophilite was proposed by using the model consisting of four different types of kalsilite structure. The positions and intensities of the X-ray powder pattern were able to be explained on the basis of these four domains, belonging to thr twinning by merohedory. As a result of the conditions of the syntheses, it may be supposed that the violation of the AI-O-AI avoidanice rule can possibly exist along the domain boundaries. |
| キーワード | kaliophilite kalsilite synthese domain boundary |
| 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 | 57 |
| 終了ページ | 64 |
| 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 | 120002310557 |
| JaLCDOI | 10.18926/ESR/13934 |
|---|---|
| フルテキストURL | ESR_3_47.pdf |
| 著者 | 松田 敏彦| 黒崎 誠| |
| 抄録 | Several specimens of rectorite-type regularly interstratified mineral (including Ca-rich one of hydrother-mal origin) from roseki deposits together with a few rectorites were examined by chemical analysis, X-ray diffraction and IR spectroscopy. These specimens are rich in SiO2, AI2O3 and H2O in addition to considerable amounts of CaO, Na2O and K2O. The Ca content in mica-like layers ranges from a slight amount to exceeding 50% of the total interlayer population. For the Ca-bearing specimens, AI-for-Si substitution in the tetrahedral sheets of mica-like layers increases in proportion to the Ca contents. Characteristic absorption bands of 950-900 cm-1 and 700-670 cm-1 are observed in IR spectra. The bands are due to AI-for-Si substitution in the tetrahedral sheets. Judging from the chemical analysis and IR spectra, the component of mica-like layer rich in Ca is not that of mica but mainly that od margarite (brittle mica). Expansion characteristics of the Ca-rich mineral are similar to rectorite and expandable layer is close to beidellite. The mineral is somewhat less expandable than rectorite under the condition of RH70-80% (Na-saturation) and EG treatment (K-saturation). The rectorite-type Ca-rich mineral reported here is simlar to rectorite in its expansion characteristics, but the component of mica-like layers is different from that of rectorite. Mica-like layer of the mineral must be mainly composed of margarite-like layer. The mineral is mainly composed of a 1 : 1 regular interstratification of dioctahedral britlle mica (margarite) and smectite (beidellite). The mineral does not strictly correspond to rectorite, defined as a 1 : 1 interstratified mineral of dioctahedral mica and smectite. |
| キーワード | rectorite brittle mica/smectite margarite regular interstrarification |
| 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 | 47 |
| 終了ページ | 56 |
| 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 | 120002310640 |
| 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/13930 |
|---|---|
| フルテキストURL | ESR_3_25.pdf |
| 著者 | 梶芳 浩二| 鈴木 功| |
| 抄録 | Thermal expansion of forsterite, Mg2SiO4, is measured up to 1,600 K by the dilatometric method. The present results of volume thermal expansion Yv is 3.20 percent from 300 to 1,200 K and expansion coefficient αv is 40.5 × 10-6 K-1 at 1,200 K. They are close to those of a natural olivine (Suzuki, 1976), but are 4.4 and 11 percent smaller as compared with those reported in the former paper (Suzuki et al., 1984). The Yv and αv of forsterite are 5.00 percent and 46.7 × 10-6 K-1 respectively, at 1,600 K. |
| キーワード | forsterite olivine thermal expansion high temperature |
| 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 | 25 |
| 終了ページ | 32 |
| 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 | 120002310333 |
| 著者 | 黒田 昌宏| 浅海 淳一| 西川 光治| 田中 聖了| 高 献書| 山本 道法| 巻幡 栄一| 平木 祥夫| 川崎 祥二| |
|---|---|
| 発行日 | 1993-02 |
| 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/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 |