High resolution X–ray computed tomography and scanning electron microscopy studies of multiphase solid inclusions in Oman podiform chromitite: implications for post–entrapment modification
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- YAO Yuan
- Graduate School of Sciences & Technology, Niigata University
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- TAKAZAWA Eiichi
- Department of Geology, Faculty of Science, Niigata University Japan Agency for Marine–earth Science and Technology
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- CHATTERJEE Sayantani
- Department of Geology, Faculty of Science, Niigata University
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- RICHARD Antonin
- Université de Lorraine, CNRS
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- MORLOT Christophe
- Université de Lorraine, CNRS
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- CRÉON Laura
- Sorbonne Université, CNRS, IRD, MNHN
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- AL–BUSAIDI Salim
- Maadin Enterprises LLC
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- MICHIBAYASHI Katsuyoshi
- Graduate School of Environmental Studies, Nagoya University
抄録
<p>We used high–resolution X–ray computed tomography (HRXCT) combined with scanning electron microscopy (SEM) to obtain 3D and 2D images of multiphase solid inclusions within chromite from the Samail ophiolite to investigate post–entrapment modification of the inclusions. Results indicate that the parental melt of the chromitite was supersaturated in chromian spinel. Chromite continued to crystallize on the inner wall of the host chromite after the melt was trapped. Rapid growth caused crystallization of high–Cr#[= Cr/(Cr + Al)] chromite lining around inclusions. The necking–down of originally large melt inclusions probably produced various assemblages of daughter minerals among the inclusions. We report two observations that are consistent with rapid growth of the host chromite: the 3D distribution of inclusions in host chromite and the host chromite showing skeletal morphology. High–temperature homogenization experiment was conducted to obtain the parental melt composition of the inclusions. We found that the homogenized glass does not represent the parental melt trapped in the host chromite because of the remaining of high–Cr# chromite lining and possible residual phases in the experiments.</p>
収録刊行物
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- Journal of Mineralogical and Petrological Sciences
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Journal of Mineralogical and Petrological Sciences 115 (3), 247-260, 2020
一般社団法人 日本鉱物科学会
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詳細情報 詳細情報について
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- CRID
- 1390566775145818752
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- NII論文ID
- 130007863953
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- ISSN
- 13493825
- 13456296
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可