Journal of the Mass Spectrometry Society of Japan
Online ISSN : 1880-4225
Print ISSN : 1340-8097
報文
タクラマカン砂漠の砂の化学組成と138Ce/142Ce, 143Nd/144Nd および 87Sr/86Sr 同位体比について
田中 剛安藤 直行上岡 晃富樫 茂子
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38 巻 (1990) 3 号 p. 133-141

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Cerium, neodymium and strontium isotopes as well as 33 elements were analyzed for Takla Makan desert sand. The results are discussed in comparison with loess, North American Shale Composite and so-called average amounts of the elements in crustal rocks. Elemental abundances in the desert sand are within 0.3 to 2 times of the crustal values. Large Ion Lithophiles (LIL) like rare earth elements are poor in the desert sand, as compared with loess in China. Fine-grained mesostasis rich in LIL are considered to have been transported as loess from the desert sand. Strontium and neodymium isotopic compositions of the desert sand (εSr(0)=+160, εNd(0)=-12.1) are identical with those of loess in China and Hwang-He suspended particles. These values show continental nature of the sand. 138Ce/142Ce ratio, on the other hand, is smaller than that of chondrite. This suggests that the La/Ce ratio integrated into time and space of China is smaller than that of chondrite.

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© 1990 日本質量分析学会
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