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Journal of Palaeogeography
Fig. 9 | Journal of Palaeogeography

Fig. 9

From: Different accretion and diagenetic patterns within the fabrics of the Permian–Triassic boundary microbialites on the Leye isolated carbonate platform, South China Block

Fig. 9

Preservation of PLFs and the carbon isotopic trends of different types of PTBMs at Tianba section (modified after Harwood 2013). Autotrophy microbes are well lithified in stromatolites, but are less well lithified in stromatolitic thrombolites and spotted thrombolites due to the decomposition of heterotrophic bacteria. Anoxic and supersaturated seawater dramatically reduce biomass resulting in biosignature loss in digitate thrombolites. The δ13Ccarb values gradually turn negative with the intensified activities of heterotrophic bacteria

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