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Baizhu Formation
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Baizhu Fm base reconstruction

Baizhu Fm

Period: 
Neoproterozoic

Age Interval: 
Qb （57）


Province: 
Guangxi

Type Locality and Naming

Northernmost Guangxi. The Baizhu Fm (lower formation of the Danzhou Gr) was named by the Guangxi Party of Regional Geological Survey in 1966. The typical section is situated at Baizhu village in Lindong, Rongshui County, Guangxi Zhuangzhu Zizhiqu (Guangxi Zhuang Autonomous Region). Lowermost formation in the Danzhou Gr.

Synonym: （白竹组）


Lithology and Thickness

The Baizhu Formation is obviously subdivided into two members. The base of the Lower member is composed of gray to greenish gray metamorphic conglomerate, pebbly gritstone and pebbly sericite quartz-phyllite, the lower part is composed of metamorphic sandstone intercalated with phyllite or schist, and the upper part is composed of schist or phyllite, with thickness of 237 to 569 m. Upper member is composed of gray to greenish gray calc-schist, calc-phyllite, sericite-phyllite, and calcareous talc-schist intercalated with limestone, dolomite or marble. The uppermost part in Hetong area of Sanjiang County bears a 4-20 cm band of hematite and the thickness of the upper member varies from 39 to 410 m.

[Figure: The limestone of the Baizhu Fm in Longsheng area, Guangxi Province (photo by Chen Jianshu)]


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

It unconformably overlies the underlying Sipu Gr (Sibao Gr)

Upper contact

The Hetong Fm (middle formation of the Danzhou Gr) conformably overlies the Baizhu Fm.

Regional extent

Northernmost Guangxi. It developed in Rongshui County, Guangxi


GeoJSON

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Fossils


Age 

SHRIMP U-Pb dates of 801±3 Ma in the Baizhu Fm and 834±4 Ma in the underlying Yuxi Formation of the Sipu Group (Gao Linzhi et al., 2010).

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
888.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.55

    Ending date (Ma):  
846.00

Depositional setting

The sedimentary structure of the formation is dominated by flat-beddings, occasionally with lenticular or irregular beddings. The marble in the upper member bears pelitic and calcareous laminae, occasionally with convolute beddings.


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.