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Likou Gr

Likou Gr

Period: 
Neoproterozoic

Age Interval: 
late-Late Qingbaikouan (late Tonian), Qb (60)


Province: 
Anhui

Type Locality and Naming

Southernmost Anhui. The Likou Gr was named by Xia Bangdong et al. in 1962. The typical section is situated in Likou in Qimen County, Anhui Province.

Synonym: （沥口组）


Lithology and Thickness

The Likou Gr is a suite of low-grade metamorphic volcanic rock and can be subdivided into two formations. The lower one, the Dengjia Fm, is composed of clastic rock with a variable grain size. The upper one, the Puling Fm, is andesite lava. [See those formation entries for details.] Its total thickness is 1087 m.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

It rests unconformably on the underlying Shuangqiaoshan Gr; or conformable on the Shangxi Gr.

Upper contact

It is conformably overlain by the Xiuning Fm

Regional extent

Southernmost Anhui. The Likou Group is considered to correspond to the horizon of the Shangshu Fm or the Luokedong Gr.


GeoJSON

null

Fossils


Age 

A LA-ICP-MS date of 804.2±7.7 Ma was acquired from the Dengjia Fm. (Zeng Yan et al., 2019). late-Late Qingbaikouan (late Tonian) on schematic stratigraphic column.

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.