NDLI: A late-devonian (Famennian)Renalcis-Epiphyton reef at Zhaijiang, Guilin, South China

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A late-devonian (Famennian)Renalcis-Epiphyton reef at Zhaijiang, Guilin, South China

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Facies : Volume 36

A late-devonian (Famennian)Renalcis-Epiphyton reef at Zhaijiang, Guilin, South China

Content Provider	Springer Nature Link
Author	Jian wei, Shen Chang min, Yu Hui min, Bao
Copyright Year	1997
Abstract	Microbial reefs, together with stromatolitic mounds and ooid shoals, constitute massive limestones in Famennian platform marginal strata in Guilin, in sharp contrast to the well-known coral-stromatoporoid reefs in the Givetian and Frasnian. Microbes played a significant and important role as stabilizers in the Famennian carbonate deposits of Guilin. A reef at Zhaijiang was constructed byEpiphyton andRenalcis, and is representative of such carbonate buildups. The reef is situated 10 km west of Guilin and corresponds to a microbe-dominated platform margin carbonate complex. Organisms in the Zhaijiang microbial reef are low diversity and dominated by ostracods and two genera of microbes,Epiphyton andRenalcis. Other microbial genera such asSphaerocodium andWetheredella occur in most of reef facies in Guilin, but their role as reef builder is doubtful because they occur only in minor amounts. The same four genera occur in volumetrically significant amounts in the upper Devonian carbonate complexes of Alberta. Canada and Western Australia. However.Epiphyton is more abundant in the Guilin reefs.The Zhaijiang microbial reef developed above Famennian proximal slope faices, as suggested by reef architecture and paleogeographic setting. The facies sequence of the microbial reef can be divided into three parts. The lower part is composed of medium-bedded bioclastic grainstones with a few microbial framestone lithoclasts, representing a proximal slope facies. The middle part consists of thin-bedded mudstone and shale with limestone lenses that are thought to be low stand deposits. In some cross sections, mudstone and shale infilled tidal channels that developed in the bioclastic grainstones.Renalcis-Epiphyton framestone constitutes the upper part with massive stacking patterns. The reef is 35 m thick and over 50 m in width. Nine litho- and biofacies are recognized. Zhaijiang reef provides an example of a binder guild-dominated buildup in the almost vacant reef ecosystem of the Famennian and represents a characteristic kind of reef after the Frasnian/Famennian extinction.
Starting Page	195
Ending Page	209
Page Count	15
File Format	PDF
ISSN	01729179
Journal	Facies
Volume Number	37
Issue Number	1
e-ISSN	16124820
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sedimentology Carbonate rocks Reefs Renalcis-epiphyton reef Microbes China Devonian (Famennian) Biogeosciences Geochemistry Paleontology Ecology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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