result 18311 件
| Author | Tanaka, Seiryou| |
|---|---|
| Published Date | 1993-08 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume105 |
| Issue | issue7-8 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/ESR/13912 |
|---|---|
| FullText URL | ESR_5_17.pdf |
| Author | Yamamoto, Masahiro| Kase, Katsuo| Harada, Kaori| |
| Abstract | 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. |
| Keywords | Sulfur isotope ratio Besshi-type deposit Tsuchikura mine Pyrite Chalcopyrite |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 1998-09-20 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 17 |
| End Page | 22 |
| ISSN | 1340-7414 |
| language | English |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002310378 |
| Author | Sato, Kyo| |
|---|---|
| Published Date | 1993-02-27 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume105 |
| Issue | issue1-2 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/ESR/13908 |
|---|---|
| FullText URL | ESR_6_39.pdf |
| Author | Yamamoto Masahiro| Ichimoto Hideo| Komatsu Shinji| Yamashita Ruka| |
| Abstract | Hydrogen and oxygen isotope rations of thermal waters from 46 spas in Okayama Prefecture range from -62.6 to -29.2% in δD and from -10.0 to -4.4% in δ18O, respectively. The isotope rations indicate that all but one of the thermal water in Okayama prefecture are meteoric in origin. The Ofuku thermal water is the only exception, which is probably a mixture of seawater and meteoric water with the ratio of about 1. Sulfur isotope rations of dissolvel sulfate in the thermal waters range from -6.2 ti 59.3% in δ34S. The high δ34S values observed in some thermal waters may be due to bacterial reduction of sulfate. |
| Keywords | Hydrogen isotope ratio Oxygen isotope ratio Sulfur isotope ratio Thermal water Spa Okayama |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 1999-09-20 |
| Volume | volume6 |
| Issue | issue1 |
| Start Page | 39 |
| End Page | 44 |
| ISSN | 1340-7414 |
| language | English |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002310408 |
| JaLCDOI | 10.18926/ESR/13907 |
|---|---|
| Title Alternative | Chemical and Rb-Sr isotopic features of the shock-melted chondrite Yamato-793533 |
| FullText URL | ESR_6_29.pdf |
| Author | Okano, Osamu| Katayama, Hiroko| Nakamura, Noboru| |
| Abstract | 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. |
| Keywords | LL-chondrite Shock-melting Sr isotope |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 1999-09-20 |
| Volume | volume6 |
| Issue | issue1 |
| Start Page | 29 |
| End Page | 38 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002310391 |
| JaLCDOI | 10.18926/ESR/13905 |
|---|---|
| Title Alternative | Measurements of CO2 in air and sea over the Western Pacific-MR98-04 Cruise- |
| FullText URL | ESR_6_13.pdf |
| Author | Kono, Takehiko| Yamashita, Eiji| Nogami, Terumasa| Tsukamoto, Osamu| |
| Abstract | 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. |
| Keywords | Western Pacific pCO2 PCO2 Horizontal distribution CO2 flux Vertical distribution |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 1999-09-20 |
| Volume | volume6 |
| Issue | issue1 |
| Start Page | 13 |
| End Page | 22 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002310525 |
| JaLCDOI | 10.18926/ESR/13904 |
|---|---|
| FullText URL | ESR_6_1.pdf |
| Author | Inoue, Yoshinori| Kase, Katsuo| |
| Abstract | Phlogopite and hornblende were found in amall amounts in the contact-metamorphosed dunite-harzburgite complex at Yanomine. Phlogopite occurs in interstices of silicate minerals in dunite and harzburgite located near the contact with granite. Some phlogopite grains also occur as inclusions in chromian spinel of chromitite bands. Hornblende is present associated with such metamorphic minerals as talc, olivine and orthopyroxene. Interstitial phlogopite is characterized by lower TiO2 and higher K/(K+Na) atomic ratio compared to that included in chromian spined. Hornblende in dunite chages its composition from edenite associated with olivine-talc through edenitic hornblende to Si-poorer magnesio-hastingsitic hornblende and magnesio-hastingsite with olivine or olivine-orhtopyroxene. The interstitial phlogopite is suggested to have been formed intimately connected with fluids generated in ralation to the intrusion of granite. On the other hand, included phlogopite is considered to have crystallized from the incompatible elements-enriched hydrous melt resulted from mantle-melt interaction. Hornblende should be a metamorphic mineral formed under high temperature conditions. |
| Keywords | Phlogopite Hornblende Ultramafic complex Dunite Harzburgite Chromitite Contact metamor-phism Yanomine |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 1999-09-20 |
| Volume | volume6 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 12 |
| ISSN | 1340-7414 |
| language | English |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002310269 |
| Author | Sato, Kyo| |
|---|---|
| Published Date | 1993-02-27 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume105 |
| Issue | issue1-2 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/ESR/13902 |
|---|---|
| FullText URL | ESR_7_47.pdf |
| Author | Yamagiwa Nobuo| Suzuki, Shigeyuki| Okimura Yuji| |
| Abstract | A new rugose coral species, Lithostrotion (Siphonodendron) hinensis is described in this paper. It was collected from the Carboniferous Hina limestone in Okayama Prefecture, Southwest Japan. Judging from the paleontological data, the age indicates probably Late Viaean, Early Carboniferous. |
| Keywords | Early Carboniferous rugosa Lithostrotion (Siphonodendron) Hina Limestone Okayama |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2000-09-20 |
| Volume | volume7 |
| Issue | issue1 |
| Start Page | 47 |
| End Page | 50 |
| ISSN | 1340-7414 |
| language | English |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002310319 |
| JaLCDOI | 10.18926/ESR/13899 |
|---|---|
| FullText URL | ESR_7_27.pdf |
| Author | Henmi, Chiyoko| Kusachi, Isao| Kagetama Tatsuya| |
| Abstract | 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. |
| Keywords | aegirine aegirine-augite diopside pyroxene hybrid rock skarn |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2000-09-20 |
| Volume | volume7 |
| Issue | issue1 |
| Start Page | 27 |
| End Page | 34 |
| ISSN | 1340-7414 |
| language | English |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002310313 |
| Author | Jisho, Takayoshi| |
|---|---|
| Published Date | 1994-12 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume106 |
| Issue | issue11-12 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/ESR/13897 |
|---|---|
| Title Alternative | Water-soluble materials formed by the reaction between a volcanic rock and HCI and/or SO2 gases |
| FullText URL | ESR_7_21.pdf |
| Author | Akagi, Seishi| Yamamoto, Masahiro| |
| Abstract | 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. |
| Keywords | Volcanic gas Volcanic ash Water-soluble material CI/SO4 ratio |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2000-09-20 |
| Volume | volume7 |
| Issue | issue1 |
| Start Page | 21 |
| End Page | 26 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002310554 |
| Author | Joichi, Yasutaka| Narong, Lenghor| Takayanagi, Toshio| Oshima, Mitsuko| Motomizu, Shoji| Ura, Nobuo| |
|---|---|
| Published Date | 2006-11-17 |
| Publication Title | 分析化学 |
| Volume | volume55 |
| Issue | issue9 |
| Content Type | Journal Article |
| Author | Yamagata, Koichi| |
|---|---|
| Published Date | 1993-08 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume105 |
| Issue | issue7-8 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/ESR/13894 |
|---|---|
| Title Alternative | Native gold from Mikawa mine, Niigata Prefecture, Japan |
| FullText URL | ESR_7_19.pdf |
| Author | Yamakawa, Junji| Tanabe, Mitsuo| Shimada, Kazumasa| Henmi, Chiyoko| |
| Abstract | 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. |
| Keywords | Native Gold Mikawa Mine electrum ESO-M01001 |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2000-09-20 |
| Volume | volume7 |
| Issue | issue1 |
| Start Page | 19 |
| End Page | 20 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002310280 |
| JaLCDOI | 10.18926/ESR/13893 |
|---|---|
| FullText URL | ESR_7_15.pdf |
| Author | Oda, Hitoshi| Ito Aki| |
| Abstract | Long-period coda waves were recorded on the vertical-component seismograms of aftershocks of the Hyogo-ken Nanbu earthquake, 1995. We identify the long-period coda waves as Rayleigh wave, because they appear after the S-arrival times and exhibit the normal dispersion that propagation velocity of the coda waves increases with an increase in period. By applying the moving window analysis to the coda waves from nine aftershocks, the group velocities are determined as a function of period within the range of 2 to 8 s. The group velocity dispersion data are inverted to investigate the S-wave velocity structure of the upper crust. The S-wave velocity structure is consistent with those obtained in previous studies using traval time analysis of bood waves. |
| Keywords | surface wave dispersion coda wave S-wave velocity structure upper crust Hyogo-ken |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2000-09-20 |
| Volume | volume7 |
| Issue | issue1 |
| Start Page | 15 |
| End Page | 18 |
| ISSN | 1340-7414 |
| language | English |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002310493 |
| JaLCDOI | 10.18926/ESR/13891 |
|---|---|
| Title Alternative | Automated observation of sea surface eddy flux on a cruising ship |
| FullText URL | ESR_7_1.pdf |
| Author | Takahashi, Satoshi| Tsukamoto, Osamu| Ishida, Hiroshi| Yoneyama, Kunio| |
| Abstract | Sea surface eddy fluxes were evaluated with the eddy correlation method including ship motion correction for the wind vector components. Previous ship motion correction algorithm was revised as a simple scheme setting a motion sensor at the same place with the sonic anemometer. This revised eddy flux system was mounted as a routine continuous measurement system on the R/V 'Mirai' of Japan Marine Science and Technology Center. The first cruise was conducted at the tropical weatern Pacific in June 2000. Continuous sea surface fluxes were obtained and the data quality was checked with some parameters. This system is planned to be developed as a automated data processing system including ship motion correction and real-time flux evaluation system. These eddy fluxes can be integrated with the bulk fluxes and radiation fluxes to understand sea surface heat balance over the global ocean. |
| Keywords | Sea surface fliux Automated observation Eddy correlation method |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2000-09-20 |
| Volume | volume7 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 14 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002310644 |
| Author | Yamamoto, Takako| Akhmad, Sabarudin| Noguchi, Osamu| Takayanagi, Toshio| Oshima, Mitsuko| Motomizu, Shoji| |
|---|---|
| Published Date | 2006-11-17 |
| Publication Title | 分析化学 |
| Volume | volume55 |
| Issue | issue9 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/ESR/13888 |
|---|---|
| Title Alternative | Relationship between the water quality of three main rivers and geology of Okayama Prafecture |
| FullText URL | ESR_8_1_29.pdf |
| Author | Kinoshita, takuya| Matsuda, Toshihiko| |
| Abstract | 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. |
| Keywords | Water quality River water Geology of basin Yoshii River Asahi River Takahashi River Okayama Prefecture |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2001-09-20 |
| Volume | volume8 |
| Issue | issue1 |
| Start Page | 29 |
| End Page | 38 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002310339 |
| JaLCDOI | 10.18926/ESR/13887 |
|---|---|
| Title Alternative | Trace of the Median Tectonic Line in Mima area, eastern Shikoku |
| FullText URL | ESR_8_1_13.pdf |
| Author | Mizui, Yoshinobu| Tachibana, Toru| Suzuki, shigeyuki| |
| Abstract | Tracing outcrops of shear zone were used to describe the geometry and structure of the Median Tectonic Line in Mima area, eastrn Shikoku. A distinct new fault outcrop was discovered between the Mino and Ikuchi Faults at the northern slope of the Mt. Boso. These two faults are regarded as a single continuous fault. The analysis of surface fabrics of quartz in fault in fault gauge has been carried out to determine relative fault activity events. |
| Keywords | surface fabrics fault gauge Mino-Ikuchi Fault Median Tectonic Line |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2001-09-20 |
| Volume | volume8 |
| Issue | issue1 |
| Start Page | 13 |
| End Page | 28 |
| ISSN | 1340-7414 |
| language | Japanese |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002310656 |
