砂漠堆積物の化学組成と風化機構についての一考察 : 中国タクラマカン砂漠の一例(<特集>砂漠地域における応用地質)

概要

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The chemical compositions of the desert sediments collected from Taklimakan Desert, China, were studied and their chemical characteristics are elucidated. 1) Si0_2, Al_20_3, K_20, Na_20 and Ba are abundant in coarser fractions of most of sediments, and CaO. MgO, Fe_20_3, MnO, P_20_5, Cr, Sr, C, S and V are abundant in finer fractions. 2) Effect of sedimentary environment on chemical compositions is not clear, but regional effect is suggested by geochemical map. The chemical composition of finer fraction of dune sand is homogeneous, suggesting that the fine particle is supplied from wide area of the desert. 3) In view of chemical weathering, Na_20 and K_20 might dissolve in water and deposit as chloride or sulfate in the sediments related to river, whereas CaO and MgO might be immobile or retained in fine fractions as salt.
一般社団法人日本応用地質学会の論文
1993-02-10