R8: 変成岩とテクトニクス

[R8P-01] Mineralogical Heterogeneity of UHP garnet peridotite in the Bohemian Massif, Czech Republic

*Juliah Wangari Muriuki¹, Daisuke Nakamura¹, Takao Hirajima², Martin Svojtka ³ (1. Okayama Uni., 2. Kyoto Uni. , 3. Institute of Geology CAS)

キーワード：Garnet peridotite, Spinel, Ultra-high pressure

We classified the Nové Dvory garnet peridotites based on the chemical compositions of garnet and constituent minerals. Our petrographic and thermobarometric investigations indicate that the peridotites might have experienced different equilibration stages and the chemical heterogeneity (especially in Cr contents of garnet) may have been created by mechanical mixing of different rock types (i.e., Cr-rich and Cr-poor types) during the compression and/or decompression stage(s).