O2 and H2S coexistence in stromatolites |
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Authors: | W E Krumbein H Buchholz P Franke D Giani C Giele K Wonneberger |
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Institution: | 1. Fachbereich IV der Universit?t, D-2900, Oldenburg
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Abstract: | The coexistence of O2 and H2S in recent microbial mats is demonstrated. Oxygen and H2S are not only coexisting in considerable concentrations within recent stromatolites but high concentrations of the respective gases occur in alternating laminae. This “sandwich structure” is produced by alternating populations of oxygenic and anoxygenic photosynthetic bacteria and cyanobaeteria. The finding of such conditions may explain the alternation of oxidized and reduced iron minerals in Precambrian stromatolites and possibly also in the banded iron formations (BIFs). |
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