Middle and Late Devonian microbial carbonates,reefs and mounds in Guilin,South China and their sequence stratigraphic,paleoenvironmental and paleoclimatic significance |
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| Authors: | Email author" target="_blank">Jianwei?ShenEmail author Jianbin?Teng Pedoja?Kevin |
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| Institution: | South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; Key Laboratory of Marginal Sea Geology, South China Sea, Institute of Oceanology and Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510301,China |
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| Abstract: | Microbial precipitation of calcium carbonate has played a major role in formation of carbonate platforms since the Archean. Also, microbial carbonates and biologically induced ce-ment are important contributors to reef framework volume and rigidity in carbonate platform systems during times of significant environmental change including transgressive events in plat-form environments and the recovery interval following the major biotic crisis. The stratigraphic distribution of different types of microbial carbonates appears to vary within the sequence strati-graphic framework. Reefs and mounds within the Late Devonian carbonate platforms in Guilin, South China are formed primarily by calcimicrobes and biologically induced cement, representing the microbe-dominated and characteristic carbonate buildups within a reefal ecosystem that nearly all reef-building metazoans were absent after the Frasnian/Famennian biotic crisis. Mi-crobial community and microbialite seem to be linked with specific palaeoenvironment and pa-laeoclimate, suggesting that they could be used as indicators of environmental change and biotic events. |
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| Keywords: | microbial carbonates reefs and mounds palaeoenvironment palaeoclimate Late Devonian Guilin |
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