Online ISSN : 2186-490X
Print ISSN : 1346-4272
ISSN-L : 1346-4272
Volume 59 , Issue 9-10
Showing 1-4 articles out of 4 articles from the selected issue
  • Shigeru Terashima, Noboru Imai, Yoshie Tachibana, Ken Ikehara, Hajime ...
    2009 Volume 59 Issue 9-10 Pages 439-459
    Published: March 31, 2009
    Released: August 28, 2013
        In order to characterize the variation of elemental concentrations according to the grain size classification, a total of 795 river and marine sediments were analyzed for major and minor constituents. Almost all the constituents of the river sediments are enriched more in the fine fractions than in the coarse ones, but both K and Ba are often abundant in the coarse fraction of sediments. The K and Ba abundant coarse sediments are commonly derived from the felsic rocks containing a large amounts of potassium feldspar. In the case of some muddy river sediments collected in the plain areas, somehow P, Cu, Zn and C are enriched more in the coarse fraction than in the middle fraction of sediments. In this case, the coarse sediment particles consist mainly by the nodules which composed of small clastic materials, clay minerals and biogenic materials. Although most constituents of the marine sediments are also much dominant in the fine fraction than in the coarse one, Ca, Sr and As are generally enriched in the coarse grain sediments distributed in relatively shallower water depth. There is no clear increasing or decreasing tendency in the abundance of Fe, Co, Ce, U and Y according to the grain size classification. High concentrations more than five times over background abundance are found for Mn and Mo in the fine sediments collected in the deeper water depth of the Japan Sea. The significant amounts of Ca and Sr in the coarse marine sediments are derived from the calcareous materials such as shell and coral fragments and/or calcareous algae. The anomalous behavior of As, Fe, Co, Ce, U, Y, Mn or Mo concentration according to the grain size classification may be caused by the process of weathering and diagenesis in the marine environments.
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  • Hiroaki Nakayama, Hiroko Iijima, Nobuko Nakamura, Hajime Kayanne
    2009 Volume 59 Issue 9-10 Pages 461-466
    Published: March 31, 2009
    Released: August 28, 2013
        Carbon and oxygen isotope ratios (δ13C and δ18O) of calcium carbonate samples are ordinarily translated their raw measurement results into PDB scale by using a working standard, which isotope ratio is calibrated by an international carbonate standard. This study reports the isotope values of carbonate standard materials of JCp-1 and JCt-1 and evaluated them as the working standards of the isotope measurements. The isotope ratios of repeated measurement showed uniform values, δ13CPDB= –1.63±0.03‰, δ18OPDB=–4.71±0.03‰ for JCp-1, and δ13CPDB=+2.79±0.02‰, δ18OPDB=–0.496±0.03‰for JCt-1, and they are appropriate for working standards. We can determine isotope value of sample, which isotope range is –5.01‰<δ13CPDB<1.95‰ and –22.97‰<δ18OPDB< –2.20‰, by using a singlepoint anchoring of JCp-1 or JCt-1.
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