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Gongdong Formation
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Gongdong Fm base reconstruction

Gongdong Fm

Period: 
Neoproterozoic

Age Interval: 
Qb （57）


Province: 
Guangxi

Type Locality and Naming

Northernmost Guangxi. The Gongdong Fm was named by the Guangxi party of regional geological survey in 1966 and was formally published on Guidebook of 1: 200 000 Scale Geological Map of Rongan in 1968. The typical section is situated in Gongdong village, Rongsgui County, Guangxi Zhuangzhu Zizhiqu (Guangxi Zhuang Autonomous Region). Uppermost formation in the Danzhou Gr.

[Figure: Type section of the Gongdong Fm]

Synonym: （拱洞组）


Lithology and Thickness

The Gongdong Fm is composed of gray and grayish green sericite-slate, sericite-phyllite, sericitized quartz-phyllite intercalated with metamorphic sandstone, arkosic sandstone, siltstone. The lower part has more sandstone, in some places even dominated by sandstone, which is locally intercalated with tuffaceous arkose, tuffaceous slate, thin-bedded ferruginous sandstone, conglomerate and lenses of dolomite. The rhythmites composed of meta-sandstone, siltstone, quartz-sericite slate and sericite-slate are very developing and each cyclothem varies from a few centimeters to several meters, with flat and parallel beddings, oblique beddings and cross-beddings, generally with flute cast structures. The Gongdong Formation is dominated by turbidite and the thickness varies from 384 to 1783 m.


Lithology Pattern: 
Gneiss


Relationships and Distribution

Lower contact

The lower part rests conformably on the underlying Hetong Fm

Upper contact

The top is overlain unconformably by the Chang'an Fm (glacial Sturtian)

Regional extent

Northernmost Guangxi.


GeoJSON

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Fossils


Age 

A SHRIMP U-Pb 787±6 Ma date was acquired from the top part of the formation (Gao Linzhi et al., 2014); and a SHRIMP U-Pb 799.8±5.4 Ma date is from the lower part of the formation (Gao Linzhi et al., 2015).

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.65

    Beginning date (Ma): 
818.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
776.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Extracts from The Neoproterozoic Erathem (chapter in Stratigraphic Lexicon of China, draft of 2022) by Gao Linzhi, Ding Xiaozhong, Zhang Chuanheng, Zhang Heng.