| Position | Detrital composition (%) | Cuttings composition (%) | Mica (%) | ||||
| Quartz | Feldspar | Rock Fragments | Igneous Rock | Metamorphic Rock | Sedimentary Rock | ||
| Chang 81 | 28.25 | 37.77 | 13.32 | 5.04 | 7.43 | 0.59 | 5.89 |
| Chang 82 | 28.09 | 38.98 | 11.54 | 4.18 | 7.06 | 0.3 | 4.88 |