Cr-rich magnesiokatophorite as an indicator of mantle metasomatism by hydrous Na-rich carbonatite
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- ALI Murad
- Department of Geology, University of Taiz
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- ARAI Shoji
- Department of Earth Sciences, Kanazawa University
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Abstract
Na- and Cr-rich amphibole and clinopyroxene are commonly observed in hydrous mantle xenoliths hosted by Pliocene-Quaternary basalts from Yemen. The amphibole is Cr-rich magnesiokatophorite high in Na2O (3.66-5.65 wt%) and Cr2O3 (2.21-3.09 wt%), relatively low in K2O (0.23-0.66 wt %) and almost free of Cl and F. The clinopyroxene is characterized by high Cr2O3 (up to 5.64 wt%) and Na2O (up to 2.97 wt%), indicating appreciable amounts of kosmochlor. Both minerals show high REE concentrations as well as HFSE depletion, suggesting an involvement of carbonatitic melt in their formation. The magnesiokatophorites and kosmochlor-bearing diopside possibly formed through metasomatism by hydrous Na-rich carbonatite melt. Magnesiokatophorite is an indicator of metasomatism by hydrous Na-rich carbonatite in the upper mantle.
Journal
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- Journal of Mineralogical and Petrological Sciences
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Journal of Mineralogical and Petrological Sciences 108 (4), 215-226, 2013
Japan Association of Mineralogical Sciences
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Details 詳細情報について
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- CRID
- 1390001206546934016
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- NII Article ID
- 10031191341
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- NII Book ID
- AA11460926
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- ISSN
- 13493825
- 13456296
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed