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Three-dimensional study by synchrotron radiation computed tomography of melt distribution in samples doped to enhance contrast

Published online by Cambridge University Press:  02 January 2018

Susumu Ikeda ,
Tsukasa Nakano ,
Akira Tsuchiyama ,
Kentaro Uesugi ,
Yoshito Nakashima ,
Koichi Nakamura ,
Hideto Yoshida  and
Yoshio Suzuki
Susumu Ikeda*
Affiliation:
WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan Institute of Mineralogy, Petrology and Economic Geology, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
Tsukasa Nakano
Affiliation:
Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8567, Japan
Akira Tsuchiyama
Affiliation:
Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University, Kitashirakawa Oiwakecho, Kyoto 606–8502, Japan
Kentaro Uesugi
Affiliation:
Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), Mikazuki, Hyogo 679-5198, Japan
Yoshito Nakashima
Affiliation:
Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8567, Japan
Koichi Nakamura
Affiliation:
Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8567, Japan
Hideto Yoshida
Affiliation:
Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Yoshio Suzuki
Affiliation:
Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), Mikazuki, Hyogo 679-5198, Japan
*
*E-mail: [email protected]
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Abstract

The three-dimensional distribution of melt in partially molten synthetic samples compositionally corresponding to diopside (90 wt.%)–anorthite (10 wt.%) and doped with PbO, WO3, MoO3, or Cs2O to enhance contrast was studied by X-ray computed tomography (CT) with synchrotron radiation. The heavy elements were strongly concentrated in the melt and contributed to an increase of the X-ray linear attenuation coefficient (LAC) of it. PbO was found to be compatible with silicate melt (>20 wt.% in solution) and incompatible with diopside crystals. Other oxides WO3 (∼10 wt.%), MoO3 (∼5 wt.%) and Cs2O (< 5 wt.%) are also soluble only in the melt. Such doping is useful not only for LAC control in X-ray CT measurements, but also for systematic control of the structure (wetting properties, distribution and connectivity) of partial melt. This technique gives basic information for discussion of the 3D distribution of partial melt having different wetting properties. As PbO was most effective in visualization of the diopside–anorthite partially molten system, CT images of the PbO-bearing sample were used for further 3D investigation of distribution. A distribution of dihedral angles at solid-melt-solid triple junctions ranging from 22 to 55° was observed with the 3D data. This range in angle distribution was probably caused by anisotropy of crystals and the result supports the argument that there is some limitation in a theoretical framework of stereology which estimates the 3D structure based on 2D observations. Investigators have begun to apply X-ray CT to the study of the 3D distribution of partial melts in rocks using synchrotron radiation. Our study on the effect of doping is one approach for developing a technique to investigate 3D melt distribution.

Keywords

partial meltingX-ray computed tomographysynchrotron radiationdopingcontrast enhancement3D observationsdihedral angles
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 5 , October 2017 , pp. 1203 - 1222
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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