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Suxiong Formation
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Suxiong Fm base reconstruction

Suxiong Fm

Period: 
Neoproterozoic

Age Interval: 
late Qingbaikouan (late Tonian), Qb (45)


Province: 
Sichuan

Type Locality and Naming

South-central Sichuan. The Suxiong Fm was named by the No. 1 Party of Regional Geological Survey, Sichuan Bureau of Geology in 1965 and formally quoted in 1971 on the Guidebook of 1: 200 000 Scale Regional Geological Map of Mabian Sheet. The typical section is situated in Suxiong of Ganluo County, Sichuan Province.

Synonym: （苏雄组）


Lithology and Thickness

The Suxiong Formation is composed of terrestrial basic to acidic volcanic rock and pyroclastic rock. Lower part is greenish gray tuff intercalated with minor basalt and dacite. Middle part is intermediate to acidic lava. Upper part is dominated by tuffaceous sandstone, tuffite and basalt. The thickness varies from over 10 to about 6000 m.

[Figure: Schematic stratigraphic column with dated horizons of the Suxiong Fm, Kaijianqiao Fm, Lieguliu Fm, Guanyingya Fm and Denying Fm in the Ganluo area of Sichuan Province.]


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

The base unconformably overlies the underlying Ebian Gr

Upper contact

The top is a bed of massive compact basalt that is disconformably overlain by the Kaijianqiao Fm

Regional extent

South-central Sichuan. The Suxiong Formation is dominantly distributed in Daxiang Mts., Xiaoxiang Mts, Ganluo and Ebian area, and fragmentarily south of Baoxing and Erlang Mountain, Sichuan Province.


GeoJSON

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Fossils


Age 

A Rb-Sr whole rock date of 812 Ma was from the dacite in the upper part. Other radioisotopic dates are 805.9±4.4 Ma from the middle of the formation (Zuo J.F. et al., 2015) and 802.2±7 near the top (Zhang C.H. et al., 2020) (see figure). Late Qingbaikouan (late Tonian).

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.6

    Beginning date (Ma): 
832.00

    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.