Extended Data Fig. 6: Synchrotron XRF element maps of the ISB sample.
From: Reassessing evidence of life in 3,700-million-year-old rocks of Greenland
The distribution of trace elements relative to minerals is shown. a, Photograph of the sample. White squares show map locations. Scale bar, 10 mm. b, Distribution and X-ray intensity of detected elements for map 1. c, Distribution and X-ray intensity of detected elements for map 2. b, c, X-ray intensity variations were used to colour the element maps. Blue, zero X-ray intensity; red, maximum X-ray intensity. X-ray intensity ranges (counts per second (cps)) are shown beneath each map. All maps are for K-shell X-rays except for Ba, which was detected using L-shell X-rays.
