Table 1 Lithium abundance and isotopic composition of bulk rock, groundmass and plagioclase from the Tuff of Knob
Sample | Li (ppm) | δ7Li (‰) | ±2σ | LA-ICPMS Li range (ppm) |
|---|---|---|---|---|
Microcrystalline interior | ||||
Bulk | 15.8 | 14.41 | 0.20 | |
Bulk repeat | 15.5 | 14.44 | 0.19 | |
Groundmass 1 | 13.3 | 17.08 | 0.05 | |
Groundmass 2 | 13.7 | 16.78 | 0.28 | |
Plagioclase 1 | 36.8 | 1.79 | 0.43 | 36.0–47.3 |
Plagioclase 2 | 35.3 | 1.96 | 0.35 | 36.0–47.3 |
Vitrophyre | ||||
Bulk | 20.9 | 7.61 | 0.23 | |
Bulk repeat | 21.7 | 7.67 | 0.24 | |
Glass 1 | 28.7 | 6.22 | 0.25 | 27.9–34.3 |
Glass 2 | 28.5 | 6.46 | 0.15 | 27.9–34.3 |
Plagioclase 1 | 6.7 | 5.21 | 0.14 | 4.1–11.1 |
Plagioclase 2 | 6.5 | 5.70 | 0.23 | 4.1–11.1 |
