Figure 5
From: Pressure induced elastic softening in framework aluminosilicate- albite (NaAlSi3O8)
Seismic velocity and elastic anisotropy at high pressure.
Compressional wave, VP propagation directions (a) [100], (b)⊥ (010), (c)⊥ (001). LDA and GGA results are represented by filled red and blue symbols. Experimentally measured VP as a function of pressure for albite (An5–8)38 (open white symbols) and oligoclase (An 10–30)39 (filled black symbols) to 1 and 2 GPa respectively. The recent experimental results20 are represented by filled grey symbol. The experimentally measured velocities38,39 are softer compared to the recent experiments20 for ⊥ (010) and ⊥ (001). (d) Bulk compressional wave VP and shear VS velocity as a function of pressure. For comparison, velocities for quartz51, a silicate framework mineral is also shown. (e) AVP, and (f) AVS as a function of pressure. Also shown are the experimentally determined elastic anisotropy for albite20 and quartz47.
