1992 compilation of analytical data for rare-earth elements, scandium, yttrium, zirconium and hafnium in twenty-six GSJ reference samples     

Shiro ITOH  Shigeru TERASHIMA  Noboru IMAI  Hikari KAMIOKA  Naoki MITA  Atsushi ANDO 《Geostandards and Geoanalytical Research》1993,17(1):5-79

Abstract: Analytical data for fourteen rare-earth elements, scandium, yttrium, zirconium and hafnium, received by May 1992, have been compiled on twenty-six GSJ (Geological Survey of Japan) reference samples. Seventeen of them are 'Igneous rock series' and nine are "Sedimentary rock series". The reported data including personal communication were evaluated under the consideration on analytical methods and geochemical evidences. No significant difference has been observed between the values obtained by the different analytical methods. Based on the selected available data, 1992 compilation values were tabulated.  相似文献   

Application of distinct element analysis to three simple block models aimed at practical application to toppling failure of fissured rock slopes     

Tsuyoshi Ishida 《Computers and Geotechnics》1990,9(4):341-353

To examine the accuracy and the chracteristics of the Distinct Element Method (DEM) which has non-deformable elements, the results simulated by the DEM were compared to the results of experiments and/or theories for three simple block models of a pillar, a mass and a toppling model. Consequently, it was elucidated that the DEM is a good numerical method which can be effectively applied to toppling failure of real fissured rock slopes.  相似文献   

Elemental Concentrations in Nine New GSJ Rock Reference Samples "Sedimentary Rock Series"     

Shigeru TERASHIMA  Atsushi ANDO  Takashi OKAI  Yutaka KANAI  Masahiro TANIGUCHI  Fuminori TAKIZAWA  Shiro ITOH 《Geostandards and Geoanalytical Research》1990,14(1):1-5

Nine new rock reference samples of the "Sedimentary rock series", Chert JCh-1, Dolomite JDo-1, Lake sediment JLk-1, Limestone JLs-1, Stream sediments JSd-1 to JSd-3, and Slates JS1-1 and JSl-2 have been prepared by the Geological Survey of Japan(GSJ). Thirty major, minor and trace elements were determined using atomic absorption spectrometry, flame emission spectrometry, infrared absorption spectrometry and wet chemical techniques. The results of homogeneity tests showed that almost all elements, with a few exceptions, are considered to be distributed homogeneously in each reference sample.  相似文献   

343 pp., Hardcover, US$ 143.00/Dfl. 250.00E. Juhàcovà, Seismic Effects on Structures, Elsevier (1991).     

Tsuyoshi Ishida 《Engineering Geology》1992,32(4):286-287

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Application of the Distinct Element Method for analysis of toppling observed on a fissured rock slope   总被引：1，自引：0，他引：1  

T. Ishida  M. Chigira  S. Hibino 《Rock Mechanics and Rock Engineering》1987,20(4):277-283

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Agricultural typology and land use: Reeds, L.G., ed. (1973): proceedings of the agricultural typology commission meeting, McMaster University, Hamilton, Ont., 1972. 350 pp., tables, maps and diagrams. $12.00     

H. Ishida 《Geoforum》1975,6(3-4)

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SR isotope geochemistry of voluminous rhyolite of the Tamagawa Welded Tuffs, related rocks and andesite of the young volcanics, in Hachimantai geothermal area, Northeast Japan     

Shigeko Togashi  Teruo Shirahase  Shiro Tamanyu 《Journal of Volcanology and Geothermal Research》1985,24(3-4)

The volcanic rocks from the Hachimantai geothermal area, Northeast Japan, are divided into the following five groups: (1) rhyolite of the Tamagawa Welded Tuffs (about 500 km³, 2.0–1.4 Ma); (2) andesite related to the Tamagawa Welded Tuffs (about 10 km³, 1.5 Ma); (3) andesite of the Matsukawa Andesite (about 100 km³, 1.8-1.2 Ma); (4) dacite of the Kashinai Formation (about 100 km³, 1.1 Ma); and (5) andesite of the Young Volcanics (about 300 km³, younger than 1 Ma). ratios of less-altered samples of the five groups range from 0.7038 to 0.7046. There is no significant difference in ratios among the five groups in spite of differences in age and chemical composition. Therefore, fusion of or contamination by old acidic crust can be ruled out for the genesis of the voluminous acidic magma which produced the rhyolite of the Tamagawa Welded Tuffs and the dacite of the Kashinai Formation.The low ratios and the chemistry suggest two possibilities for the genesis of the acidic rocks. One is a low degree of partial melting of the basic crust, which has a low ratio, under high temperature. Another is a high degree of fractional crystallization from basic magma derived from the mantle.  相似文献   

1996 COMPILATION OF ANALYTICAL DATA ON NINE GSJ GEOCHEMICAL REFERENCE SAMPLES, "SEDIMENTARY ROCK SERIES"     

Noboru IMAI  Shigeru TERASHIMA  Shiro ITOH  Atsushi ANDO 《Geostandards and Geoanalytical Research》1996,20(2):165-216

Analytical data compiled on nine Geological Survey of Japan (GSJ) reference samples, "Sedimentary rock series" received by February 1996 are reported. After excluding outliers and examining critically the analytical procedures employed, the data were evaluated statistically. Recommended or preferable values for fifteen major and sixty minor and trace elements are proposed.  相似文献   

Cooling age record of domal uplift in the core of the Higher Himalayan Crystallines (HHC), southwest Zanskar, India     

Rasoul B. Sorkhabi  Arvind K. Jain  Tetsumaru Itaya  Shiro Fukui  Nand Lal  Ashok Kumar 《Journal of Earth System Science》1997,106(3):169-179

The cooling and tectonic history of the Higher Himalayan Crystallines (HHC) in southwest Zanskar (along the Kishtwar-Padam traverse) is constrained by K-Ar biotite and fission-track (FT) apatite and zircon ages. A total of nine biotite samples yields ages in the range of 14–24 Ma, indicating the post-metamorphic cooling of these rocks through ∼ 300°C in the Miocene. Overall, the ages become younger away from the Zanskar Shear Zone (ZSZ), which marks the basement-cover detachment fault between the HHC and the Tethyan sedimentary zone, towards the core of the HHC. The same pattern is also observed for the FT apatite ages, which record the cooling of the rocks through ∼ 120°C. The apatite ages range from 11 Ma in the vicinity of the ZSZ to 4 Ma at the granitic core of the HHC. This pattern of discordant cooling ages across the HHC in southwest Zanskar reveals an inversion of isotherms due to fast uplift-denudation (hence cooling) of the HHC core, which is, in turn, related to domal uplift within the HHC. The Chisoti granite gneiss is the exposed domal structure along the studied traverse. Cooling history of two granite gneisses at the core of the HHC is also quantified with the help of the biotite, zircon and apatite ages; the time-temperatures thus obtained indicate a rapid pulse of cooling at ∼ 6 Ma, related to accelerated uplift-denudation of the HHC core at this time. Long-term denudation rates of 0.5–0.7 mm/yr are estimated for the high-grade rocks of the Higher Himalaya in southwest Zanskar over the past 4.0–5.5 m.yr.  相似文献   

The determination of Mn,Fe, Ni,Cu and Zn in seawater by atomic absorption spectrometry after coprecipitation with lanthanum hydroxide     

Yoshimasa Toyota  Shiro Okabe  Satoru Kanamori  Yasushi Kitano 《Journal of Oceanography》1983,38(6):357-361

A simple and rapid coprecipitation method for the determination of several trace metals in seawater is presented. These metals are coprecipitated with lanthanum hydroxide, the precipitate is dissolved, and then the metals are determined by atomic absorption spectrometry. Lanthanum hydroxide was chosen as a coprecipitant for the following reasons, (a) lanthanum hydroxide has a sufficiently low solubility and forms an easily filterable flocculate at about 80C, and (b) lanthanum has an absorption wavelength that is sufficiently separated from those of the other elements to be analysed, i.e., Mn, Fe, Ni, Cu and Zn. Experimental results show that these metals are coprecipitated by the present method with excellent recoveries.  相似文献