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한국암석학회 한국암석학회 학술발표회 논문집 2006년도 한국암석학회·한국광물학회 공동학술발표회 논문집
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    초록·키워드

    The effect of water and stress on the lattice-preferred orientation (LPO) of olivine aggregates was investigated through large strain, shear deformation experiments at high pressures and temperatures (P = 0.5 - 2.1 GPa, T = 1470 - 1570 K) under both water-poor and water-rich conditions. The specimens are hot-pressed synthetic olivine aggregates or single crystals of olivine. Water was supplied to the sample by decomposition of a mixture of talc and brucite. Deformation experiments were conducted up to γ (shear strain) ~ 6 using the Griggs apparatus where water fugacity was up to ~13 GPa at the pressure of 2 GPa. The water content in olivine saturated with water increases with increasing pressure and the solubility of water in olivine at P = 0.5 - 2 GPa was ~400 - 1200 ppm H/Si. Several new types of LPO in olivine are found depending on water content and stress. Samples deformed in water-poor conditions show a conventional LPO of olivine where the olivine [100] axis is subparallel to the shear direction, the (010) plane subparallel to the shear plane (type-A). However, three new types (type-B, C, and E) of LPO of olivine were identified depending on the water content and stress. The type-B LPO of olivine which was found at relatively high stress and/or under moderate to high water content conditions is characterized by the olivine [001] axis subparallel to the shear direction, the (010) plane subparallel to the shear plane. The ty ... 전체 초록 보기

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      UCI(KEPA) : I410-ECN-0101-2009-459-014944983