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Chengjiang Formation
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Chengjiang Fm base reconstruction

Chengjiang Fm

Period: 
Neoproterozoic

Age Interval: 
Early Nanhuan (latest Tonian-early Cryogenian), Nh (46）


Province: 
Yunnan, Sichuan

Type Locality and Naming

Central Yunnan. The Chengjiang Fm was named by P. Misch in 1942. The typical section is located in Fenghuang Mountain north of Chengjiang County, Yunnan Province.

[Figure: The column of the Chengjiang Fm. in Yunxi area, Yunnan Province. a-Heishantou Fm of the Kunyang Gr; b-Conglomerate of the Chengjiang Fm; c-Sandstone of the Chengjiang Fm; d-Boundary between the Chengjiang Fm and Nantuo Fm.]

Synonym: （澄江组）


Lithology and Thickness

The Changjiang Fm is a suite of purplish gray and purplish red terrestrial clastic deposit that is subdivided into three parts. Lower part is composed of white gray medium-bedded lithic quartzose sandstone. Middle part is dominated by purplish gray and purplish red, medium-to thick-bedded, medium-grained lithic sandstone intercalated with lithic quartzose sandstone, fine-grained sandstone and pelitic siltstone. Upper part consists of purple to purplish gray, medium-to thick-bedded lithic sandstone, locally bearing purplish red muddy gravels and quartzitic gravels. The thickness is obviously varied, generally from 200 to 2000 m.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

With a layer of conglomerate or pebbly sandstone, the lower part unconformably rests on the underlying metamorphic-dolomitic Kunyang Gr. Elsewhere in east Yunnan, the schematic stratigraphic column shows a Liubatang Fm (Bajie Gr; Qingbaikouan = Tonian) between.

Upper contact

With an uppermost layer of purplish gray medium-bedded, medium-grained lithic sandstone, the upper part underlies unconformably the purple red tillite of the overlying Nantuo Fm

Regional extent

Central Yunnan to southernmost Sichuan. It is distributed in Jianshui, Yuxi, Kunming, Dongchuan, Yunnan Province and in Huili area, Sichuan Province.


GeoJSON

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Fossils


Age 

A SHRIMP U-Pb date of 782.9±4.9 Ma was acquired from the Chengjiang Formation in Gugeng villege, Jiangchuan County, Yunnan Province (Gao Linzhi et al., 2018). Early Nanhuan (latest Tonian-early Cryogenian) on schematic stratigraphic column.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
776.00

    Ending stage: 
Cryogenian

    Fraction up in the ending stage: 
0.94

    Ending date (Ma):  
640.10

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.