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Xiaojiahe Formation
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Xiaojiahe Fm base reconstruction

Xiaojiahe Fm

Period: 
Neoproterozoic

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


Province: 
Guizhou

Type Locality and Naming

East Guizhou. The Xiaojiahe Fm was named by the Party of Regional Geological Survey, Guizhou Bureau of Geology in 1974. The naming section is in Xiaojiahe, Yinjiang County, northwest of Fanjing Mountain, Guizhou Province. Lower-middle formation in the Fanjingshan Gr.

Synonym: （肖家河组）


Lithology and Thickness

The formation is of thin-bedded rhythmic layering, composed of grey- green, green- grey and dark grey blasto-sandstone, blasto-siltstone, slate with metamorphosed basic rock and ultrabasic rock. The basic rock is mainly of diabase and diabase olivine pyroxenite, occasionally accompanied with spilite and keratophyre. The total thickness varies from 868 m to 1393 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.]


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

It is in conformable contact with the underlying Yujiagou Fm

Upper contact

It is in conformable contact both with the overlying Huixiangping Fm

Regional extent

East Guizhou. It is developed in northwest of Fanjing Mountain, Guizhou Province.


GeoJSON

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Fossils


Age 

A SHRIMP U-Pb date of 851±4 Ma was acquired from this formation (Gao Linzhi et al., 2014). early-Early Qingbaikouan (early 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: 
0.1

    Beginning date (Ma): 
972.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.15

    Ending date (Ma):  
958.00

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.