Stability and relationship of lower mantle Al–rich phases NAL and CF in MORB⁄eclogite composition

Litasov Konstantin; 大谷 栄治; 佐野 亜沙美

doi:10.14824/jampeg.2004.0.10.0

Abstracts of Papers Presented at the Annual Meeting of The Japanese Association of Mineralogists, Petrologists and Economic Geologists

2004 Annual Meeting

Session ID : G1 P-03

DOI https://doi.org/10.14824/jampeg.2004.0.10.0

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Host: The Japanese Association of Mineralogists, Petrologists and Economic Geologists

G1:Subduction factory

Stability and relationship of lower mantle Al–rich phases NAL and CF in MORB⁄eclogite composition

*Konstantin Litasov, Eiji Ohtani, Asani Sano

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Keywords: lower mantle, high pressure, eclogite

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Abstract

The Al-bearing phases with orthorhombic (phase CF) and hexagonal (phase NAL) structures were observed in the system of average Mid-Ocean Ridge basalt at pressures above 25 GPa. Structure and composition of these two phases are very similar. Moreover, they can coexist in the single experimental sample. Here we report data on chemical composition, structure, and stability fields of the Al-bearing phases NAL and CF and investigate their relationship in the lower mantle.

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