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

概要

論文の詳細を見る
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.
日本質量分析学会の論文