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Fig. 12 | Progress in Earth and Planetary Science

Fig. 12

From: Experimental simulations of shock textures in BCC iron: implications for iron meteorites

Fig. 12

a The twin density from the top to the bottom of the samples recovered from the impacts at room temperature (Solid squares, Run 011) and 670 K (Open circles, Run 013). The density after annealing at 1070 K (Open squares, Run011H) for 10 min is also shown. The twin distribution is expressed as a linear relation, N (cm−2) = 4.14 × 105–2.34 × 104 × D (mm) (R = 0.908) for the room temperature impact, and N (cm−2) = 4.45 × 105–2.05 × 104 × D (mm) (R = 0.936) for the impact at 670 K, where N is the density of twins in a unit area of 1 cm2, and D is the depth of the sample from the crater surface in mm. (b) The relation between the twin density and pressure (GPa) that was deduced by the iSALE-2D simulation. The relation can be expressed by N (cm−2) = –6.30 × 104 + 4.11 × 104 × P (GPa) (R = 0.905). All data for room temperature (solid squares) and 670 K (open circles) are included for the fitting except a data point (*) at 13 GPa in which the twin density close to the crater may be reduced by increasing pressure and temperature

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