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Cizhuping Formation

Cizhuping Fm

Period: 
Mesoproterozoic

Age Interval: 
Qingbaikouan (earliest Tonian), Qb (Mesoprot 33; Neoprot 45)


Province: 
Sichuan

Type Locality and Naming

Central Sichuan (Leshan). The Cizhuping Fm was named by Yang Xianhe in 1978. The reference section is in Suxiong, Ganluo County, Sichuan Province. Uppermost formation in the Ebian Gr.

Synonym: （茨竹坪组）


Lithology and Thickness

The Cizhuping Fm consists mainly of meta-sedimentary clastic rocks sandwiched with metamorphosed intermediate-acid volcaniclastic rocks. In general the lower part is more coarse-grained, mainly composed of medium- to fine-grained quartz sandstone, intercalated with some meta-conglomerate, carbonaceous slate and schist; upward it changes into meta-sandy slate, interbedded with schist and phyllite, sandwiched or interbedded with intermediate-acid meta-tuff. The thickness of the formation varies from 400 to 1800 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

The base is conformable onto the underlying Lanbaoping Fm.

Upper contact

The top is unconformably overlain by the Suxiong Fm of late Qingbaikouan (middle Tonian)

Regional extent

Central Sichuan (Leshan). The formation is mainly distributed in areas from Wangyinping to Laoyingzui, Ebian County and in Ganluo, Suxiong and Jinyang, Sichuan Province.


GeoJSON

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Fossils

The phyllite yields rich microplants: Trachysphaeridium, Asperatopsophosphaera, Pseudozonosphaera, Polynucella, Leiopsophosphaeridium and Quadratimorpha.


Age 

The schematic stratigraphic column implies it as early Qingbaikouan (early Tonian)

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,000.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
860.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

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