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Chentangwu Formation
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Chentangwu Fm base reconstruction

Chentangwu Fm

Period: 
Neoproterozoic

Age Interval: 
Late Qingbaikousan (late Tonian); Qb （62）


Province: 
Zhejiang

Type Locality and Naming

North-central Zhejiang. The Chentangwu Fm was named by the Gong Rixiang and Yan Tiezeng in 2009. The typical section is situated in Chengtangwu village in Pujiang County, Zhejiang Province. Coordinate: 27°32.00´ N; 109°58.00´E.

[Figure: The holotype section and column of strata of the Chentangwu Fm in the Zhejiang Province. A-C-Sampling in tuff beds of the Chengtangwu Formation; B-Pillow lava developed in the Mengshan Formation; D-Sampling in the Mengshan Formation in the Chengtangwu reservoir in Pujiang County, Zhejiang Province.]

Synonym: （陈堂坞组）


Lithology and Thickness

The Chentangwu Fm is composed of feldspathic quartz debris siltstone, mudstone with tuff and pebble coarse sandstone, sandy gravel, mud-siliceous rocks with a thickness is over 624 m.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

The Chentangwu Fm is conformably overlying the Mengshan Fm [Not in current Lexicon. " The authors consider that the Mengshan Formation,which is below the Chentangwu Formation,is correlated with the lava pillow and spilite of the Shaoqiwa Formation in Lushan area." [Gao Linzhi and Ding Xiaozhong, 2013, Geol. Bull. China, 32: 988-995]. Regionally, the Chencai Gr (Xu'an Fm) would be the next older unit.

Upper contact

Its top part is a fault contact to Cretaceous sandstone.

Regional extent

The Chentangwu Fm is restrictedly distributed in Chentangwu, Pujiang County, Zhejiang Province.


GeoJSON

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Fossils


Age 

SHRIMP U-Pb dates of 830±6 Ma and 825±8 Ma were measured in the Chentangwu Fm (Gao Linzhi et al., 2013). For graphic purposes, put as uppermost Qingbaikouan.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
804.00

    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.