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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
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Title: EPMAによる火山ガラス組成分析:Na損失の検証と分析条件の提案
Other Titles: Analysis of volcanic glass compositions using WDS-EPMA: Examination of Na Migration and Proposal of Analytical condition
Authors: 松本, 亜希子1 Browse this author
宮坂, 瑞穂2 Browse this author
中川, 光弘3 Browse this author →KAKEN DB
Authors(alt): MATSUMOTO, Akiko1
NAKAGAWA, Mitsuhiro3
Issue Date: 19-Mar-2015
Publisher: 北海道大学大学院理学研究院
Journal Title: 北海道大学地球物理学研究報告
Journal Title(alt): Geophysical bulletin of Hokkaido University
Volume: 78
Start Page: 1
End Page: 9
Abstract: We examined the analysis method of the compositions of volcanic glass using WDS-EPMA, focusing on Na migration caused by electron-beam bombardment. As a result of the comparison among the beam current in 10 μm square area, it is concluded that Na migration occurs in any cases at 15 kV. During the first 30 seconds, Na decay is not observed, and therefore, the detection of Na must be finished within the first 30 seconds. Considering the variations of other elements, the 15 kV accelerating voltage and 7 nA beam current with raster scanning of 10 μm square area is the best condition for the determination of volcanic glass compositions. This can prevent “grow-in” of Si and Al, as well as can make smaller the deviations of the minor elements. Using this condition, we can discuss the variations of volcanic glass compositions (except for Na) without any corrections.
Type: bulletin (article)
Appears in Collections:北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第78号

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