Table 4 SEM-based x-ray microanalysis results for carbon coated rock varnish extracted from Mn-rich zones expressed as atomic per cent
Element | O | Na | Mg | Al | Si | Mn | Fe | Ca | Mn/Fe |
|---|---|---|---|---|---|---|---|---|---|
X-ray line | Kα | Kα | Kα | Kα | Kα | Lα | Lα | Kα | |
RV 1 | 65.8 | 1.9 | 1.3 | 1.2 | 3.9 | 22.5 | 3.2 | 0.4 | 7.0 |
RV 2 | 66.7 | 1.9 | 1.7 | 1.6 | 5.6 | 18.0 | 4.4 | 0.1 | 4.1 |
RV 3 | 65.7 | 1.5 | 1.0 | 2.4 | 6.5 | 14.1 | 8.9 | 1.6 | |
RV 4 | 67.0 | 1.9 | 1.4 | 1.2 | 4.4 | 19.4 | 4.3 | 0.4 | 4.6 |
RV 5 | 67.0 | 1.9 | 1.4 | 1.4 | 5.8 | 18.1 | 4.0 | 0.4 | 4.5 |
RV 6 | 67.0 | 1.9 | 1.4 | 1.2 | 4.4 | 19.4 | 4.3 | 0.4 | 4.6 |
RV 7 | 68.4 | 1.3 | 1.0 | 0.8 | 3.3 | 17.7 | 6.6 | 0.8 | 2.7 |
RV 8 | 68.5 | 1.7 | 1.2 | 0.7 | 2.8 | 21.5 | 2.9 | 0.8 | 7.4 |
Average | 67.0 | 1.8 | 1.3 | 1.3 | 4.6 | 18.8 | 4.8 | 0.5 | 4.5 |
St dev | 1.0 | 0.2 | 0.2 | 0.5 | 1.2 | 2.4 | 1.8 | 0.2 | 1.8 |
Calc. Si = 0 | 0.0 | 25.6 | 1.3 | 20.2 |