Fig. 4: A-CN-K ternary diagram showing the chemical compositions of the upper Espanola and Serpent formations. | Communications Earth & Environment

Fig. 4: A-CN-K ternary diagram showing the chemical compositions of the upper Espanola and Serpent formations.

From: Incomplete oxidative sulfide weathering and low atmospheric oxygen levels during the Great Oxidation Event

Fig. 4: A-CN-K ternary diagram showing the chemical compositions of the upper Espanola and Serpent formations.

Data from the present study (filled circles) and the previous study45 (open circles) are shown. The white star denotes the chemical composition of unweathered source rocks estimated by the previous study45. The weathering trend is expected to be parallel to the A-CN boundary and to join the source rock compositions. To correct for the effects of K-metasomatism, the raw data are projected back onto the expected weathering trend from the K apex. Filled and open squares represent the corrected data from the present and previous45 studies, respectively.

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