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Huangtian Formation
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Huangtian Fm base reconstruction

Huangtian Fm

Period: 
Neoproterozoic

Age Interval: 
early Qingbaikouan (earliest Tonian), (Qb (44)


Province: 
Sichuan

Type Locality and Naming

Southernmost Sichuan. The Huangtian Fm was named by Yang Xianhe in 1976. The type section is in Xinjietian-Xinping, Yanbian County, Sichuan Province. Lowermost formation-level unit of Yanbian Gr.

Synonym: （荒田组）


Lithology and Thickness

In the typical section, the Huangtian Fm is composed of grey green metamorphosed volcanic rock and minor metamorphosed sedimentary rock. Lower part consists of metamorphosed pillow basalt, basaltic volcanic breccia, sandwiched with sericite slate, green schist of 758 m thick. Middle part, 690 m thick, is of siliceous slate, slate, phyllite and chert, occasionally sandwiched with metamorphosed basalt. Upper part, 1490 m thick, consists of metamorphosed basalt (trachybasalt and anamesite [anamesite is a term for basaltic rocks which are between basalt and dolerite in texture]), metamorphosed basalt breccia, with minor siliceous slate. The top consists of metamorphosed andesite, metamorphosed andesitic tuffaceous breccia. It is <3000 thick.


Lithology Pattern: 
Lava


Relationships and Distribution

Lower contact

Bottom is not seen.

Upper contact

The formation is conformably or disconformably overlain by the Yumen Fm.

Regional extent

Southernmost Sichuan. It is distributed mainly around Yumen, Yanbian County, Sichuan Province.


GeoJSON

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Fossils


Age 

early Qingbaikouan (earliest Tonian)

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: 
0.2

    Ending date (Ma):  
944.00

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.