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Sainartag Formation
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Sainartag Fm base reconstruction

Sainartag Fm

Period: 
Neoproterozoic

Age Interval: 
early QIngbaikouan (early Tonian), Qb (9)


Province: 
Xinjiang

Type Locality and Naming

Kuruktag region. The Sainartag Fm was named by Zhu Chengshun et al. in 1957 and formally quoted by Gao Zhenjia in 1980. The typical section is situated in Xinggertag (middle Kuruktag) in the north of Yuli County (southwest of Heshuo County), Xinjiang Weiwuerzhu Zizhiqu (Xinjiang Uygur Autonomous Region). Lower formation of the Pargangtag Gr

Synonym: （塞纳塔格组）


Lithology and Thickness

The Sainartag Fm is a suite of dark gray to greenish gray low-grade metamorphic detrital rock. Locally, the basal part is intercalated with an unstable bed of greenish gray epidotized andesite (bearing rubbles). Lower part dominated by schistose phyllitic silty mudstone. Middle part is thin-bedded fine quartzose sandstone intercalated with schistose siltstone and silty mudstone. Upper part is dominated by thin-bedded schistose siltstone interbedded with silty mudstone, intercalated with argillaceous limestone. The total thickness varies from 1010 to 2005 m. In Pargang area, the Sainartag Formation has only 140 m preserved because of the effects of faulting.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

The Sainartag Fm rests disconformably (locally conformably) on the underlying Nansainartag Fm (the Aierjigan Gr of the Jixian System).

Upper contact

It is conformably overlain by the overlying Beisainartag Fm

Regional extent

Kuruktag region. Yuli County (southwest of Heshuo County), Xinjiang


GeoJSON

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Fossils


Age 

Early Qingbaikouan (early Tonian). The Rb-Sr age is 993 Ma, and the volcanic rock from the top of the underlying Aierjigan Gr is dated 1006.35 Ma by Rb-Sr whole rock isochron method. Therefore, the Sainartag Formation is assigned to the Early Qingbaikouan.

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: 
0.35

    Ending date (Ma):  
902.00

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.