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Fanjingshan Gr

Fanjingshan Gr

Period: 
Neoproterozoic

Age Interval: 
Early Qingbaikouan (early Tonian), Qb （52, 53, 56）


Province: 
Guizhou

Type Locality and Naming

East Guizou. The Fanjingshan Group was named by the Precambrian Reconnaissance Gr of Hunan-Guizhou-Guangxi Provinces in 1962. The group is vastly developed in Fanjing Mt. (Fanjngshan) region. The reference section is in northwest sector of Fanjing Mountain, Guizhou Province. Coordinate: 27°51.144´ N.; 108°45.998´E.

Synonym: （梵净山群）


Lithology and Thickness

Lower part is composed of interbedding of spilite and stratiform diabase, gabbro-diabase, ultrabasic rock and chert with sandy claystone rocks. Upper part is composed of thin-bedded rhythmic cycles of sandstone, siltstone and tuffaceous sandstone. The group is about 1000 m thick.

[Figure: The stratigraphic column of the Fanjingshan Gr (the group is about 1000 m thick). a. Pillow lava of the Huixiangping Fm.; b. The boundary between the underlying Fanjingshan Gr and the Furongba Fm (= lower Jialu Fm?) which is the basal formation of the Xiajiang Gr.]


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Bottom of lowest formation (Taojinhe Fm) is not seen.

Upper contact

It is unconformably overlain by the Hongzixi Fm of the Banxi Gr, or the Jialu Fm of the Xiajiang Gr.

Regional extent

East Guizou. It developed in Fanjing Mt. region.


GeoJSON

null

Fossils


Age 

SHRIMP U-Pb date of 840±5 Ma from the Huixiangping Fm in the middle of the Fanjiangshan Gr (Gao Linzhi et al., 2014). 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: 
0.4

    Ending date (Ma):  
888.00

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.