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Tiantaishan Formation

Tiantaishan Fm

Period: 
Mesoproterozoic

Age Interval: 
Jixianian (Calymmian) Jx (29)


Province: 
Henan

Type Locality and Naming

Northeast Hubei border to Henan. The Tiantaishan Fm was named by the Party of Regional Geological Survey, Hubei Bureau of Geology in 1973. The type section is from Daijiawan, Yingshan County, Hubei Province to Wangmaowu, Xinxian County, Henan Province. Lower-middle formation (2/4) in Hong'an Gr.

Synonym: （天台山组）


Lithology and Thickness

The Tiantaishan Fm is composed of greyish muscovite albite gneiss, microcline-albite gneiss, microcline albite leuco-leptite or leptite. There is green schist in the base. The top consists of graphite schist and muscovite quartz schist (or quartzite). Thickness varies from 1900 m to 4700 m.


Lithology Pattern: 
Gneiss


Relationships and Distribution

Lower contact

The base is in conformable contact with the underlying Huangmailing Fm.

Upper contact

The top is conformably overlain by the Qijiaoshan Fm.

Regional extent

Northeast Hubei border to Henan. The formation is distributed at Macheng, Dawu, Hong'an, Xiaogan, Huanpi, and Guangshui counties, Hubei Province, and south slope of Tongbai Mountain and Dabie Mountain.


GeoJSON

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Fossils


Age 

Schematic stratigraphic section shows spanning Jixianian (Calymmian).

Age Span: 

    Beginning stage: 
Calymmian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,600.00

    Ending stage: 
Calymmian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
1,400.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Extracts from The Mesoproterozoic Erathem (chapter in Stratigraphic Lexicon of China, draft of 2022) by Gao Linzhi, Ding Xiaozhong, Zhang Chuanheng, Zhang Heng.