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Taojinhe Formation
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Taojinhe Fm base reconstruction

Taojinhe Fm

Period: 
Neoproterozoic

Age Interval: 
earliest-Early Qingbaikouan (earliest Tonian), Qb (52, 53, 56)


Province: 
Guizhou

Type Locality and Naming

Northeast Guizhou. The Taojinhe Fm was named by the Party of Regional Geological Survey, Guizhou Bureau of Geology in 1974. The type section is around Biaoshuiyan-Taojinhe, Yinjiang County, northwest of Fanjing Mountain, Guizhou Province. It is the lowest formation of the Fanjingshan Gr.

Synonym: （淘金河组）


Lithology and Thickness

Lower part of the formation consists of greyish, grey and grey-green thick-bedded, medium-thick-bedded blasto-sandstone, blasto-siltstone and blasto-tuff sandwiched with slate. The sandstone possesses oblique bedding and erosion surface. Upper part is composed mostly of grey and greyish metamorphosed stratified diabase and gabbroic diabase. The thickness varies from 1000 m to 1330 m.

[Figure: The stratigraphic column of the Fanjingshan Gr (the group is about 1000 m thick). a. Pillow lava of the Huixiangping Fm.; b. The boundary between the underlying Fanjingshan Gr and the Furongba Fm (= lower Jialu Fm?) which is the basal formation of the Xiajiang Gr.]

[Figure: The Taojinhe Formation in Taojinhe river, Fanjingshan, Guizhou Province.]


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

Bottom is not seen.

Upper contact

It is in conformable contact with overlying Yujiagou Fm.

Regional extent

East Guizhou. Biaoshuiyan-Taojinhe, Yinjiang County, northwest of Fanjing Mountain, Guizhou Province.


GeoJSON

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Fossils


Age 

SHRIMP U-Pb date is not older than 870 Ma, which is belongs to Tonian of the Neoproterozoic. earliest-Early Qingbaikouan (earliest Tonian) – the seven formations of the Fanjingshan Gr spanning the early Qingbaikouan (early Tonian) are given semi-equal durations.

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: 
0.05

    Ending date (Ma):  
986.00

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.