Figure 1
(a) Color CL image of Y-86004. Yellow cross marks indicating the positions in CL-spectral measurement. (b) Parallel-polarizing microscope image of Y-86004 corresponding to the area in Fig. 1a. (c) Color-CL image of Y-86004 indicating boundaries between each zone. Zone 1: blue-CL area, zone 2: light-blue-CL area, zone 3: red-CL area. (d) BSE image of Y-86004 corresponding to the area indicating a square in Fig. 1c. Zone 1: blue-CL area, zone 2: light-blue CL area, zone 3: red-CL area, zone 4: non-CL area (fusion crust). en: enstatite, tri: tridymite, pl: plagioclase and opq: opaque minerals.
Table 1
Chemical compositions on an average of three analyses of the enstatite with different CL colors and fusion crust in each zone. n.d.: not detected.
| Enstatite in zone 1 | Enstatite in zone 2 | Enstatite in zone 3 | Fusion crust in zone 4 | ||
|---|---|---|---|---|---|
| SiO2 | 59.80 | 59.96 | 59.20 | 53.90 | wt.% |
| TiO2 | n.d. | 0.01 | n.d. | n.d. | |
| Al2O3 | 0.11 | 0.10 | 0.07 | 4.24 | |
| FeO | 0.43 | 0.11 | 0.60 | 30.60 | |
| Cr2O3 | 0.02 | n.d. | 0.02 | 0.39 | |
| MnO | n.d. | n.d. | 0.04 | 0.94 | |
| MgO | 39.81 | 39.74 | 39.48 | 5.05 | |
| CaO | 0.26 | 0.28 | 0.24 | 3.55 | |
| NiO | 0.01 | 0.01 | 0.06 | n.d. | |
| Na2O | 0.01 | n.d. | n.d. | 1.41 | |
| K2O | 0.01 | 0.01 | 0.01 | n.d. | |
| Total | 100.46 | 100.22 | 99.73 | 100.00 |
Figure 2
CL spectra for the enstatite indicated by cross marks (Fig. 1a).
Figure 3
Deconvolution of CL spectrum of blue-CL enstatite in energy units by Gaussian curve fitting.
Figure 4
Deconvolution of CL spectrum of light-blue-CL enstatite in energy units by Gaussian curve fitting.
Figure 5
Deconvolution of CL spectrum of red-CL enstatite in energy units by Gaussian curve fitting.
Figure 6
Comparison of theoretical temperature profiles. Heating duration assumed 5–20 seconds.