result 47530 件
| JaLCDOI | 10.18926/ESR/13857 |
|---|---|
| Title Alternative | Drilling Research of a high-latiude coral reef in Mage Island, Stsunan Islands, Japan |
| FullText URL | ESR_12_49.pdf |
| Author | Kan, Hironobu| Nakashima, Yosuke| Ohashi, Tomoya| Hamanaka, Nozomu| Okamoto, Takehiro| Nakai, Tatsuo| Hori, Nobuyuki| |
| Abstract | Four drilling cores are observed from a high-latitude coral reef at the northwestern Mage Island (N30゜45' 40"). The thickness of the Holocene reef is around 2.5m in the reef edge and 4m in back reef. The Holocene thickness is relatively thin comparing to the modern reefs in the middle or the southern Ryukyu Islands. The reef structure Acropora facies, reworked coral rubble facies. This zonal structure conforms to the ecological coral-zonation corresponding to the wave-energy gradient. |
| Keywords | Holocene Coral Reef Sedimentary Structure Drilling Southwestem Japan |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2005-12-31 |
| Volume | volume12 |
| Issue | issue1 |
| Start Page | 49 |
| End Page | 58 |
| 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 | 120002310535 |
| JaLCDOI | 10.18926/ESR/13856 |
|---|---|
| Title Alternative | Local wind storm (Hirodo-kaze) in northern Okayama caused by Typhoon 0421 & 0423 |
| FullText URL | ESR_12_39.pdf |
| Author | Kataoka, Fumie| Tsukamoto, Osamu| |
| Abstract | In 2004, ten typhoons had landed over Japan and a lot of damages were reported due to heavy rain, storm surge and wind storms. In the north eastern part of Okayama prefecture, local high wind "Hirodo-kaze" caused severe wind damages due to typhoon passage. During Typhoon 0421, high winds were recoreded in the south foot of Mt.Nagi as typical local wind atrom, " Hirodo-kaze". While, during Typhoon 0423, severe wind damages expanded west of the typical Hirodo-kaze srea as well as a new extreme. In the present report, a lot of surface meteorological data were coollected and compared the meteorological fields among two typhoons. |
| Keywords | Wind Storm Hirodo-kaze Typhoon Local high wind |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2005-12-31 |
| Volume | volume12 |
| Issue | issue1 |
| Start Page | 39 |
| End Page | 47 |
| 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 | 120002310608 |
| JaLCDOI | 10.18926/ESR/13855 |
|---|---|
| Title Alternative | 中国淮河流域付近の入梅前の時期における大気場や陸面状態の季節進行 (1998年の事例解析) |
| FullText URL | ESR_12_31.pdf |
| Author | Ikeda, Shoichiro| Kato, Kuranoshin| Tsukamoto, Osamu| |
| Abstract | Seasonal evolution of atmospheric and land surface conditions around the Huaihe River Basin in China in the pre-Meiyu stage of 1998 were examined, mainly based on the GAME re-analysis data. Around the Huaihe River Basin in China (just to the nront of the Changjiang River Basin), although the air temperature increased rapidly already in early June (the Meuyu front was located to the south of that region), the specific humidity did not increas so much at time. In addition, the latent heat supplied from the ground there decreased from late May to early June, compared to that before early May. The time mean southerly wind component across the low-level baroclinic Zone (although not so strong as in the mature stage of the Meiyu) invaded into Central Cjina during late April to early May. On the other hand, the relatively strong wind region once retreated southward in the middle of May associated with the onset of the Southeast Asian monsoon, and the calm wind region with frequent appearance of the surface high was seen around the Huaihe River Basin from late May to early June. Thus the present study shows that the Huaihe River Basin once experiences the rather drier stage just before the onset stage of the mature Meiyu there. |
| Keywords | arid region in China and the Meiyu front seasonal evlution in East Asia Land surface condition around the Meiyu front |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2005-12-31 |
| Volume | volume12 |
| Issue | issue1 |
| Start Page | 31 |
| End Page | 37 |
| 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 | 120002310602 |
| Author | Hidaka, Hidekuni| |
|---|---|
| Published Date | 1994-10 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume106 |
| Issue | issue9-10 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/ESR/13853 |
|---|---|
| Title Alternative | ガーナ,南部アシャンティ帯の原生代プリンスタウン・グラニトイド岩体に関する主成分地球化学 |
| FullText URL | ESR_12_15.pdf |
| Author | Samuel Dampare| Shibata, Tsugio| Daniel Asiedu| Shiloh Osae| |
| Abstract | The Pateoproterozoic metavolcanic rocks of the southern Ashanti greenstone belt of Ghana are intruded by three major suites of granitoids, locally called Prince's Town, Dixcove and Ketan plutons. The Prince's Town pluton is the largest intrusive body in the Axim area, and tends to separate the Axim volcanic branch from the Cape Three Points branch. The Pluton consists of granitic to dioritic rocks, which are generally massive but occasionally display alignment of ferromagnesian minerals. The rocks contain mainly plagioclase, K-feldspar, quartz, amphibole, biotite and opaques. The feldspars are mostly sericitized and saussuritized, and alteration of amphibole and biotite to epidote and chlorite is common. Accessory minerals include apatite, sphene and zircon. The geochemical data indicate that the rocks are tonalitic to granodioritic in composoition, metaluminous (ASI<1) and have I-type characteristics. The granitoids have the SiO2 content of 63-70% ; total iron, as Fe2 O3 of 3.10-5.80% ; (Na2O+K2O) content of 5.01-6.96% and Na2O/K2O ratios from 1.34 to 2.70 ; and are characterized by Mg# ranging from 53 to 48. The Fe*(=FeOtot/FeOtot+MgO) and modified alkali-lime index (MALI) of the rocks indicate that the Prince's Town pluton is dominantly magnesian and calcic in nature. Higher values in molar CaO/(MgO+FeOtot) coupled with low molar AI2O3/(MgO+FeOtot) may suggest their derivation from partial melting of metabasaltic to metatonalitic sourcc, with a possible contribution from metagreywacke, but preclude any contribution from metapelitic sources. The Birimaian metavolcanic rocks are the likely source material candidate for the rocks. CIPW norm calculations yielded a crystallization temperature of～650-685℃ and a pressure of 4-7kb for the rocks, suggesting a lower crustal souree. The Prince's Town plutonic rocks also show characteristice of plutons emplaced in a volcanic are tectonic setting environment. This observation is largely consistent with previous studies conducted on granitoids from other parts of the southern Ashanti greenstone belt c and the belt-type granitoids of Ghana as a whole. |
| Keywords | Geochemistry tectonic setting granitoids Birimian Ghana |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2005-12-31 |
| Volume | volume12 |
| Issue | issue1 |
| Start Page | 15 |
| End Page | 30 |
| 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 | 120002310649 |
| Author | Hirakawa, Keiichi| |
|---|---|
| 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/13851 |
|---|---|
| Title Alternative | ガーナ, ビルム・ダイヤモンド産地のアクァティア地域に分布する沖積層の重鉱物分析 |
| FullText URL | ESR_12_7.pdf |
| Author | Samuel Dampare| Daniel Asiedu| Bruce Banoeng-yakubo| Shibata, Tsugio| |
| Abstract | Heavy mineral analysis was carried out on Pliocene to Recent alluvial sediments from the Birim diamondiferous field od Ghana. The main objective of the study was to examine the mineral composition of heavy fractions in order to identify : (1) the heavy mineral assenblage that occur in the sediments, (2) particular diamond indicator minerals associated with the diamonds, and (3) the provenance of the alluvial sediments. The heavy minerals are essentially composed of staurolite, ilmenite and magnetite in varying proportions, with trace amounts of leucoxene, rutile, garnet and zircon. The heavy mineral assenblage and chemical composition of ilmenite and gamet suggest their derivation from phyllites and schists which reflect directly the composition of the basement rocks developed in the study area. The absence of diamond indicatior minerals such as apatite, pyrope garmet, chromian spinel, and picroilmenite in the heavy fraction is unlikely to be due to their destruction during intense weathering and/or diagenesis but rarher their non-occurrence in the area. |
| Keywords | Heavy minerals provenance sediments diamonds Ghana |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2005-12-31 |
| Volume | volume12 |
| Issue | issue1 |
| Start Page | 7 |
| End Page | 14 |
| 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 | 120002310657 |
| JaLCDOI | 10.18926/ESR/13850 |
|---|---|
| Title Alternative | 沖縄トラフ第四与那国海丘海底熱水系チムニーの錫を含む黄銅鉱と白金を含む輝蒼鉛鉱 |
| FullText URL | ESR_12_1.pdf |
| Author | Gena, Kaul| Chiba, Hiroshi| Kase, Katsuo| |
| Abstract | The active sulfide chimney ore sampled from the flank of the active Tiger chimney in the Yonaguni Knoll IV hydrothermal system, South Okinawa Trough, consists of anhydrite, pyrite, shalerite, galena, chalcopyrite and bismuthinite. Electron microprobe analyses indicated that the chalcopyrite and bismuthinite contain up to 2.4 wt. % Sn and 1.7 wt. % Pt, respectively. The high Sn-bearing chalcopyrite and Pt-bearing bismuthinite are the first occurrence of such minerals on the submarine hydrothermal systems so far reported. The results confirm that the Sn enters the chalcopyrite as a solid solution towards stannite by the coupled substitution of Sn 4+ Fe 2+ for Fe 3+ Fe 3+ while Pt enters the bismuthinite structure as a solid solution during rapid growth. The homogenization temperature of the fluid inclusions in anhydrite (220-310℃) and metasured end-member temperature of the vent fluids (325℃) indicate that the minerals are precipitated as metastable phases at temperature around 300℃. The Sn-bearing chalcopyrite and Pt-bearing bismuthinite expess the original composition of the minerals deposited from a hydrothermal fluid with temperatures of about 300℃. |
| Keywords | Sn-bearing chalcopyrite Pt-bearing bismuthinite Active sulfide Chimmey Yonaguni Knoll IV Okinawa Trough seafloor hydrothermal system |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2005-12-31 |
| Volume | volume12 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 5 |
| 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 | 120002310444 |
| Author | Murakami, Takuro| |
|---|---|
| Published Date | 1994-10 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume106 |
| Issue | issue9-10 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/ESR/13848 |
|---|---|
| Title Alternative | Eastward extension of the Baiu Front on the surface weather maps in ralation to zonal scale of the area with strong low-level southerly wind toward the front |
| FullText URL | EAR_13_1_19.pdf |
| Author | Nakayama, Yuuki| Owada, Michio| Ikeda, shoichiro| Kato, Kuranoshin| |
| Abstract | Eastward extension of the Baiu front in relation to zonal scale of the area with strong low-level southerly wind toward the front was examined based on the operational surface weather maps and the NCEP/NCAR re-analysis data mainly for the mature Baiu period (15 June to 31 July) from 1991 to 2000. During that period, the Baiu front on the surface weather maps appeared from the Changjiang River Basim to the east of the Japan Islands accompanied by the strong low-level southerly wind toward it in a wide zonal scala(～3500km), in many cases. However, the situations when the appesrance of the Baiu front was limited to the western part of the Japan Islands or limited to its eastern part are sometimes found with relatively narrow zonal acale of the strong low-level southerly wind toward the front, although the appearance frequency of such cases was not so high. As such the present results illustrate the importance of the zonal scale of the subtropical high for the spatial activity of the Baiu front. |
| Keywords | variation of the Baiu front southerly wind in the subtropical high area zonal extension of the Baiu front |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2006-03-31 |
| Volume | volume13 |
| Issue | issue1 |
| Start Page | 19 |
| End Page | 25 |
| 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 | 120006211873 |
| JaLCDOI | 10.18926/ESR/13847 |
|---|---|
| Title Alternative | Geology of Holocene deposits in Mizushima Area, Okayama Prefecture, Japan |
| FullText URL | EAR_13_1_15.pdf |
| Author | Suzuki, Shigeyuki| |
| Abstract | The study srea, Mizushima is occupied by polder and reclaimed land. The ground of this area is composed of the Holocene deposits below the surface. The deposits are mostly 10 to 20m in thickness and composed of 2 units, the B Unit and C&D Unit. The B Unit is composed of muddy sand with 2 to 3m in thickness. This unit is thought to be deposited in the mouth of paleoriver. The C&D Unit is composed of marine mud and sand with 10 to 15m in thickness. This unit is especially soft and will expand ground oscillations during an earthquake. |
| Keywords | Holocene deposits Mizushima Area Ground oscillation |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2006-03-31 |
| Volume | volume13 |
| Issue | issue1 |
| Start Page | 15 |
| End Page | 18 |
| 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 | 120002310562 |
| Author | Furusho, Yoshiaki| Makita, Nobuaki| Ono, Masato| Ishiyama, Takashi| Takahashi, Motoyuki| Motomizu, Shoji| |
|---|---|
| Published Date | 2008-01-29 |
| Publication Title | 分析化学 |
| Volume | volume56 |
| Issue | issue12 |
| Content Type | Journal Article |
| FullText URL | Ana_Sci_24_505.pdf |
|---|---|
| Author | Kunihiko Seno| Kazuki Matsumura| Oshima, Mitsuko| Motomizu, Shoji| |
| Published Date | 2008-04-10 |
| Publication Title | Analytical Sciences |
| Volume | volume24 |
| Issue | issue4 |
| Publisher | 日本分析化学会 |
| Start Page | 505 |
| End Page | 508 |
| ISSN | 0910-6340 |
| NCID | AA10500785 |
| Content Type | Journal Article |
| language | English |
| OAI-PMH Set | 岡山大学 |
| Copyright Holders | 日本分析化学会 |
| File Version | publisher |
| DOI | 10.2116/analsci.24.505 |
| JaLCDOI | 10.18926/ESR/13844 |
|---|---|
| Title Alternative | バングラディシュの更新世台地の地形と地質 |
| FullText URL | EAR_13_1_1.pdf |
| Author | Towhida Rashid| Md. hossain Monsur| Suzuki, Shigeyuki| |
| Abstract | With regards to the origin and evolution of the Pleistocene tracts (Lalmai, Madhupur and Barind tracts) of Bangladesh, two trends of thoughts are common. Most of the authors believed that the Madhupur, Barind and Lalmai tracts represent tectonically uplifted surface. Some researchers have different opinion and they believed that the Lalmai hills and the Madhupur locality represent tectonically uplifted blocks but the whole Barind tract and the major portion of the Madhuput tracts are not tectonically uplifted, rather these are originated by erossional-depositional processes. In order to solve the problems associated with origin and evolution of Pleistocene tracts of Bangladesh, further study is needed. Borehole data may be collected and fusion images can be prepared from aerial photographs and setellite images to detect netectonic imprins and geomorphological signatures of the areas. Elaborate laboratory analysis of sediment deposits, radiocarbon dating my indicate a new dimension about the origin and evolution of these tracts. |
| Keywords | Bangladesh Lalmai Hill Barind Tract Madhupur Tract Neotectonices Aerial photographs Satellite Image Fusion Image |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2006-03-31 |
| Volume | volume13 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 13 |
| 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 | 120002310445 |
| Author | Noguchi, Osamu| Oshima, Mitsuko| Motomizu, Shoji| |
|---|---|
| Published Date | 2008-05-10 |
| Publication Title | Analytical Sciences |
| Volume | volume24 |
| Issue | issue5 |
| Content Type | Journal Article |
| Author | 岡山外科会| |
|---|---|
| Published Date | 1994-02 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume106 |
| Issue | issue1-2 |
| Content Type | Others |
| Author | 岡山骨移植研究会| |
|---|---|
| Published Date | 1994-02 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume106 |
| Issue | issue1-2 |
| Content Type | Others |
| Author | Mizobuchi, Satoshi| |
|---|---|
| Published Date | 1994-10 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume106 |
| Issue | issue9-10 |
| Content Type | Journal Article |
| Author | Sei, Tetsurou| |
|---|---|
| Published Date | 1994-02 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume106 |
| Issue | issue1-2 |
| Content Type | Journal Article |
| Author | Obayashi, Naotsugu| |
|---|---|
| Published Date | 1993-08 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume105 |
| Issue | issue7-8 |
| Content Type | Journal Article |
