High Pressure Earth Science. Determination of the Phase Boundaries of Mantle Minerals using in situ X-ray Diffraction Technique.

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  • 高圧地球科学　　Ｘ線その場観察法によるマントル鉱物相転移境界の決定
  • Xセン ソノバ カンサツホウ ニ ヨル マントル コウブツソウ テンイ キョウカイ ノ ケッテイ

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Abstract

In Situ X-ray diffraction technique has been successfully used to determine the phase transition pressures of mantle minerals at high pressure and high temperature. This technique has an advantage in accurate estimation of pressure using internal pressure standards such as NaCl, Au, and MgO, as well as the simultaneous identification of the phases present at high temperature and high pressure. This paper reviews these studies which attempted to determine the phase boundaries based on in situ X-ray diffraction measurements, including our recent results obtained at the new synchrotron facility, Spring-8. Some technical problems inherent to this technique are discussed on the basis of these currently available experimental data.

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