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- W2151247014 abstract "Microbial consortia are found in modern stromatolites. It has been uncertain if such microbial consortia already existed in late Archean stromatolites. Stable carbon and sulfur isotope analyses were performed on organic matter and pyrite in stromatolites, cherts and sandstones of the Jeerinah Formation. Fine-grained microscopic pyrite crystals occur predominantly inside the stromatolites. Sulfur isotope compositions of individual pyrite crystals were determined using the Nd-YAG laser microprobe system. Variable δ 34 S values (−2.5 to +5.6‰ (CDT)) of pyrite were found in the examined samples, suggesting that pyrite crystals were formed by either abiotic or biotic sulfate reduction in stromatolite. Geological and petrographic evidence suggest that microbial sulfate reduction was the more likely pathway of the pyrite formation. δ 13 C values of organic matter range from −39.7 to −27.1‰ (PDB). These values indicate that microorganisms capable of photosynthesis were active around stromatolites in addition to the activity of methanotrophic microorganism. These stable isotope data suggest that various type of microorganisms existed during stromatolite formation, although the role of each microorganism in stromatolite accretion is still uncertain." @default.
- W2151247014 created "2016-06-24" @default.
- W2151247014 creator A5031527913 @default.
- W2151247014 creator A5064480945 @default.
- W2151247014 date "2006-07-20" @default.
- W2151247014 modified "2023-09-24" @default.
- W2151247014 title "Sulfur and carbon isotope analyses of 2.7Ga stromatolites, cherts and sandstones in the Jeerinah Formation, Western Australia" @default.
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- W2151247014 doi "https://doi.org/10.1016/j.precamres.2006.03.005" @default.
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