Figure 2: Geochemical trends across the Bruce–Espanola boundary. | Nature Communications

Figure 2: Geochemical trends across the Bruce–Espanola boundary.

From: Osmium evidence for synchronicity between a rise in atmospheric oxygen and Palaeoproterozoic deglaciation

Figure 2

Initial 187Os/188Os values, abundances of redox-sensitive elements, TOC content, carbon isotopic values in TOC (δ13Corg), and total sulphur content are shown. Light grey area represents the sandstone–siltstone interval. The average 192Os concentrations in upper continental crust12 and oceanic basalt20 are shown as dark and light lines, respectively, in the plot showing Os concentration. Dashed lines show average Re, Mo and U concentrations normalized by Al2O3 in upper continental crust34. Initial 187Os/188Os values were obtained based on a depositional age of 2.3±0.2 Ga. The grey line in the plot showing initial 187Os/188Os represents the value of mantle-derived components at the time of deposition20. The errors in the initial 187Os/188Os values are mainly derived from the errors in depositional age. Black circles in the 192Os and Re plots represent the results using inverse aqua regia dissolution media, and red and blue circles represent those using chromium-sulphuric acid.

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