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Zhangqian Formation
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Zhangqian Fm base reconstruction

Zhangqian Fm

Period: 
Neoproterozoic

Age Interval: 
Middle Qingbaikouan (middle Tonian), Qb (60)


Province: 
Anhui

Type Locality and Naming

Southernmost Anhui. The Zhangqian Fm was named by Xia Bangdong in 1962. The naming locality is the Zhangqian Village, Xiuning County, Anhui and the reference section is in Jinzipai Village, Qimen County, Anhui Province. Formerly in lower Shangxi Gr, then transferred to upper Shuangqiaoshan Gr.

Synonym: (章前组)


Lithology and Thickness

Lower part of the formation is composed of grey-green phyllitic siltstone, sandy siltstone intercalated with silty phyllite and phyllite. Upper part is green, grey-green phyllite, sandwiched with minor sericite-chlorite-quartz phyllite, and the top has an interbedding of grey and black siltstone alternating with white banded sandstone. The strata contain disseminated magnetite. The exposed recorded thickness is over 2600 m


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

No base has been seen

Upper contact

The top is in conformable contact with overlying Banqiao Fm.

Regional extent

Southernmost Anhui and northeast Jiangxi. It is distributed around Qimen of southern Anhui Province.


GeoJSON

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Fossils


Age 

Some authors attribute the formation to the Neoproterozoic Erathem. This question of its geologic age is pending further investigation. Middle Qingbaikouan (middle Tonian) implied by relative stratigraphic position. [Not on schematic stratigraphic columns.]

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.2

    Beginning date (Ma): 
944.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.3

    Ending date (Ma):  
916.00

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.