Figure 5 | Scientific Reports

Figure 5

From: Alteration of rocks by endolithic organisms is one of the pathways for the beginning of soils on Earth

Figure 5

NanoSIMS study of the 30 × 30 μm site at the surface of organo-mineral association in combination with SEM-SE/EDX and optical microscopy in reflected light. ROIs – selected regions of interest with different correlations between ions. Optical microscopy initially suggested close links between OM and Fe species. Nitrogen rich OM (higher 12C14N counts) is more frequently directly colocalized with other mineral compounds, mainly containing aluminum (seen at the NanoSIMS 27Al16O/12C14N composite image and ROI 1 ion spectra). Rough and flaky patterns seen in SEM-SE in vicinities of ROIs 1–3 are indicative of clay particles, and these regions are enriched in 12C14N and 32S.

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