地殻岩石試料中のハロゲン元素存在度

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Halogen (F,Cl,Br,I) abundances in Japanese standard rock samples prepared and issued by the Geological Survey of Japan are reviewed. Halogen contents in rock samples are generally fairly to very low; several 100 ppm for F and Cl, several ppm for Br and several 10 ppb for I. Therefore, precise determination of halogens. especially Br and I, in rock samples are considerably difficult, as implied by a limited number of data of these elements for standard rock samples. For Cl, Br and I, radiochemical neutron activation analysis can be applied to rock samples, yielding reliable data of these elements. Although halogens are typical lithophile elements, they behave differently in geochemical processes, possibly due to the difference in volatility. Halogen contents in JB-1 and JB-1a (replacement of JB-1), and JG-1 and JG-1a (replacement of JG-1) are unexpectedly variable, suggesting that halogens are distributed heterogeneously even within the same parental materials. Considering halogen (Cl, Br and I) abundances in crustal rocks and mantle-derived materials and distribution of halogens in the earth, it is suggested that halogen abundances of the earth is different from those of Cl chondrites, from which the solar system abundances of most elements including halogens are derived. If this is the case, such a fractionation among halogens must have occurred during the accretion of the earth at the early stage of the solar system.
特定非営利活動法人日本火山学会の論文
1997-04-25

地殻岩石試料中のハロゲン元素存在度

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