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Temperature derivatives of elastic wave velocities in plagioclase (An51±1) above and below the order-disorder transition temperature
| Content Provider | Semantic Scholar |
|---|---|
| Author | Kono, Yoshio Miyake, Akira Ishikawa, Masahiro Arima, Makoto |
| Copyright Year | 2008 |
| Abstract | 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. |
| Starting Page | 558 |
| Ending Page | 564 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.2138/am.2008.2591 |
| Alternate Webpage(s) | http://www.minsocam.org/msa/ammin/toc/Abstracts/2008_Abstracts/Apr08_Abstracts/Kono_p558_08.pdf |
| Alternate Webpage(s) | https://doi.org/10.2138/am.2008.2591 |
| Volume Number | 93 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
