Temperature derivatives of elastic wave velocities in plagioclase (An51 1) above and below the order-disorder transition temperature
書誌事項
- 公開日
- 2008-04-01
- DOI
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- 10.2138/am.2008.2591
- 公開者
- Mineralogical Society of America
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説明
Compressional ( v p ) and shear ( v s ) wave velocities of plagioclase (An 51±1 ) were measured up to 900 °C at 1 GPa. The temperature derivatives of v p (∂ v p /∂ T ) and v s (∂ v p /∂ T ) show a discontinuous change at ~400 °C. The ∂ v p /∂ T is −0.9 × 10 −4 km/s/°C below 400 °C and −4.4 × 10 −4 km/s/°C above 400 °C. The ∂ v p /∂ T also increases from −0.7 × 10 −4 to −4.1 × 10 −4 km/s/°C. These v p and v s show reversible changes between 25 and 700 °C. In contrast, both v p and v s increase (0.08 and 0.08 km/s, respectively) at 700–800 °C, and show irreversible changes after heating to 800 and 900 °C. The X-ray powder diffraction analysis shows that the run product heated to 900 °C shows a higher lattice angle γ than the run products obtained on heating up to 700 °C, which is comparable to the lattice angle γ of high and low plagioclase, respectively. We ascribe the discontinuous change in v p , v s , ∂ v p /∂ T , and ∂ v s /∂ T to the order-disorder transition of plagioclase at high temperatures.
収録刊行物
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- American Mineralogist
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American Mineralogist 93 (4), 558-564, 2008-04-01
Mineralogical Society of America
