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Temperature derivatives of elastic wave velocities in plagioclase (An51±1) above and below the order-disorder transition temperature
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April 1, 2015
Abstract
Compressional (vp) and shear (vs) wave velocities of plagioclase (An51±1) were measured up to 900 °C at 1 GPa. The temperature derivatives of vp (∂vp/∂T) and vs (∂vp/∂T) show a discontinuous change at ~400 °C. The ∂vp/∂T is -0.9 × 10-4 km/s/°C below 400 °C and -4.4 × 10-4 km/s/°C above 400 °C. The ∂vp/∂T also increases from -0.7 × 10-4 to -4.1 × 10-4 km/s/°C. These vp and vs show reversible changes between 25 and 700 °C. In contrast, both vp and vs 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 vp, vs, ∂vp/∂T, and ∂vs/∂T to the order-disorder transition of plagioclase at high temperatures.
Received: 2007-2-1
Accepted: 2007-10-9
Published Online: 2015-4-1
Published in Print: 2008-4-1
© 2015 by Walter de Gruyter Berlin/Boston
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