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Shuangxiwu Gr

Shuangxiwu Gr

Period: 
Neoproterozoic

Age Interval: 
Early Qingbaikouan (early Tonian), Qb (61)


Province: 
Zhejiang

Type Locality and Naming

North Zhejiang. The Shuangxiwu Gr was named by Zhang Jiankang, Ma Ruishi et al. in 1973 and published in 1975 by Zhejiang Party of Regional Geological Survey. The type section is in Zhangcun- Shuangxiwu, Fuyang City, Zhejiang Province. Coordinate: 29°53.407´N； 120°02.438´E. Upward succession of Pingshui Fm, Beiwu Fm, Yanshan Fm and Zhangcun Fm (see individual formations for details).

Synonym: （双溪坞群）; The Zhonglu Gr is considered as a synonym of the group

[Figure: The section of the Shuangxiwu Gr in Zhangcun-Shuangxiwu, Fuyang City, Zhejiang Province]


Lithology and Thickness

The Shuangxiwu Gr is dominated by schistose intermediate-basic to acidic volcanic lava and tuff, sandwiched with sandstone, sandy-conglomerate, mudstone and limestone lens, locally with phyllite and sericite quartz schist. The thickness varies from 400 to 3100 m.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

Bottom is not seen.

Upper contact

It is unconformably overlain by the Luojiamen Fm of Heshangzhen Gr

Regional extent

North Zhejiang. The Gr is distributed in Fuyang, Shaoxing and Xiaoshan, northwestern Zhejiang Province.


GeoJSON

null

Fossils


Age 

SHRIMP U-Pb dates of 905±5 Ma, 902±7 Ma, 899±8 Ma and 878±9 Ma are found in the Group (Gao Linzhi et al., 2014). Early Qingbaikouan (early Tonian) on schematic stratigraphic column.

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.