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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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Science China Earth Sciences 2005年第11期48卷 1900-1912页

作者： Pedoja Kevin 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

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.

关键词： microbial carbonates reefs and mounds palaeoenvironment palaeoclimate Late Devonian guilin.

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Devonian reef complexes in guilin. Guangxi, South China

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Chinese Science Bulletin 1995年第13期40卷 1110-1114页

作者：俞昌民沈建伟 Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China

The Early and early Middle Devonian deposits (below the varcus Zone) in guilin.are ina clastic neritic facies. By the beginning of the varcus Zone, guilin.began to record a histo-ry of the carbonate deposition in which the reefs and algal limestones constitute the impor-tant lithohorizons. It was not until the Late Famennian and earliest Carboniferous that thereefs were intermittently developed along the margin of carbonate platform, and in somecases, in the interior of the platform. As a whole, the marine Devonian form a megacyclemainly composed of clastics in the lower and carbonates in the upper and contain some hi-atus with different scales which correspond to various bioevents and sedimentary *** features of the reef complexes in guilin.have been described in ref. [1]. Localitiesmentioned in the present note are illustrated in figure 1.

关键词： reef complexes Devonian guilin.

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