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Progress in Earth and Planetary Science
Fig. 3 | Progress in Earth and Planetary Science

Fig. 3

From: FTIR microspectroscopy of carbonaceous matter in ~ 3.5 Ga seafloor hydrothermal deposits in the North Pole area, Western Australia

Fig. 3

An example of the optical photomicrographs and transmission IR spectra of the analyzed carbonaceous clots. a Optical photomicrograph. The squares indicate the analyzed areas (50 × 50 μm2). The IR spectra of the two analyzed areas (thick-bordered squares A and B) are shown in b and c. b Transmission IR spectra (64 scans) of the carbonaceous clots with (a) and without (b) aliphatic CH moieties. One scale unit on the vertical axis corresponds to an absorbance of 0.2. The IR spectrum in b is representative of those obtained from the white squares in a (without aliphatic CH bonds). c An enlarged view of the IR spectra in b within 3000–2800 cm−1. The range is indicated by the dotted rectangle in b. The arrow represents the IR band at ~ 2925 cm−1. One scale unit on the vertical axis corresponds to an absorbance of 0.02

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