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Huili Gr

Huili Gr

Period: 
Mesoproterozoic

Age Interval: 
Changchengian-Yuxian (Statherian-Stenian) (Ch-Yx) (35)


Province: 
Sichuan

Type Locality and Naming

Southernmost Sichuan. The Huili Gr was named by Xie Zhenxi et al. in 1964. The type locality is around Huili, Sichuan Province. The group, which belongs to Neoproterozoic Erathem, was subdivided into 6 formations from bottom to top as Hekou-Huili Fm, Tong'an Fm, Tangtang Fm, Limahe Fm, Fengshanying Fm and Tianbaoshan Fm. [Tianbaoshan Fm is not in current Lexicon] Hekou-Huili Fm has an appended "huili" to avoid duplication with "hekou" of Permian age.

Synonym: （会理群）


Lithology and Thickness

In the type locality, it is composed of metamorphosed clastic rock and carbonate rock, intercalated with volcanic rock. [See component formations for details.] The total thickness varies from 15840 m to 16780 m.


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

The contact relation with underlying Kangding Complex Gr (Paleoproterozoic) is unknown.

Upper contact

The top is unconformably overlain by either the Doushantuo Fm or the Dengying Fm (Sinian/Ediacaran). Elsewhere in south Sichuan, the schematic stratigraphic column implies the overlying unit is the Lieguliu Fm volcanics of Nanhuan age (middle Cryogenian).

Regional extent

Southernmost Sichuan. Huili, Sichuan Province.


GeoJSON

null

Fossils


Age 

SHRIMP U-Pb date of 1011.9±8.9 Ma was acquired from the Tianbaoshan Fm (Zhang Jibiao et al., 2020). Schematic stratigraphic section gives span of entire Changchengian-Yuxian (Statherian-Stenian).

Age Span: 

    Beginning stage: 
Statherian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,800.00

    Ending stage: 
Stenian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
1,000.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Huili Gr description is from The Neoproterozoic Erathem (chapter in Stratigraphic Lexicon of China, draft of 2022) by Gao Linzhi, Ding Xiaozhong, Zhang Chuanheng, Zhang Heng; but individual formation descriptions are in The Mesoproterozoic Erathem (chapter by the same authors).