Experimental study for elements distribution in rock forming minerals by the cutting edge electron microscopy

2015 Fiscal Year Final Research Report

• Project/Area Number: 24540526
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geochemistry/Astrochemistry
• Research Institution: Fukuoka University (2013-2015); Kyushu University (2012)
• Principal Investigator: Toh Shoichi 福岡大学, 理学部, 助教 (20380595)
• Co-Investigator(Kenkyū-buntansha): NAKAMUTA Yoshihiro 九州大学, 総合研究博物舘, 准教授 (80128058) ; MIYAKE Akira 京都大学, 大学院理学研究科, 准教授 (10324609)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 分析電子顕微鏡 / ALCHEMI法 / エネルギー分散型X線分光分析 / かんらん石 / 斜方輝石 / HARECXS法

Outline of Final Research Achievements

In late years, upsizing of the detection area of the energy dispersive X-rays spectrometer advanced. Not only we could take in a characteristic X-ray in a short time, but also the detection of the trace element was enabled, too. We investigated possibility to utilize the characteristic of the newly developed detector for the ALCHEMI method which was technique to decide the element distribution in the crystal in this study.
Natural olivine and orthopyroxene were used as sample, and two analytical transmission electron microscopes, JEOL JEM -2100 and JEM-2100F were used in the present study. The elements distribution in crystals have been investigated by the HARECXS method in addition to the ALCHEMI method. As a result, we confirmed that Mn and Ni showed contradicting site selectivity within olivine. In orthopyroxene, both Fe and Mg showed completely disordered nature between the M1 and M2 sites.

Free Research Field

鉱物学