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Pargangtag Gr

Pargangtag Gr

Period: 
Neoproterozoic

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


Province: 
Xinjiang

Type Locality and Naming

Kuruktag region. The Pargangtag Group was named by Gao Zhenjia et al. in 1976 and formally published by Xinjiang Compiling Group for Regional Stratigraphic Scale in 1981. The typical section is situated in south slope of Pargangtag Mountain in Shanshan County, Xinjiang Weiwuerzhu Zizhiqu (Xinjiang Uygur Autonomous Region).

Synonym: （帕尔岗塔格群）


Lithology and Thickness

The lower part (Sainartag Fm) is composed of thin-bedded meta-siltstone; silty shale interbedded with quartzite. The upper part (Beisainartag Fm) is composed of thick-bedded stromatolite-bearing dolomitic limestone, crystalline limestone and minor dolomite. The thickness varies from 754 to 2000 m.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

The basal part rests disconformably or conformably on the underlying Aierjigan Gr (Nansainartag Fm) of the uppermost Mesoproterozoic.

Upper contact

The upper part is unconformably overlain by the Nanhuan Beiyixi Fm tillite (lowest formation of the Kuruktag Gr).

Regional extent

Kuruktag region. The Pargangtag Gr is dominantly distributed in Pargangtag, Kuruktag, Xingditag and Yardang Maintain, also exposed in Xingertag, Moqinkuduk and Xishankou of west Kuruktag.


GeoJSON

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Fossils

The upper part yields abundant stromatolites (small reefs) dominated by Inzeria f., Gymnosolen f., Katavia f., in addition Patomia f., Kutuikania f., Jurusania f., Linella f., X in jiangella f., and abundant oncolite Osagia, etc.


Age 

QIngbaikouan (Tonian). The Rb-Sr age of the volcanic rock from overlying Beiyixi Fm is 814 and 773 Ma and the Rb-Sr whole rock age of the granite intruded into the Pargangtag Gr is 920.6±90.9 Ma. In addition, the volcanic intercalations of the underlying Airgigan Group is dated as 1006 Ma by Rb-Sr method. There, the Pargangtag Group is inferred as belonging to the Qingbaikouan with an age of about 1000-850 Ma

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: 
0.6

    Ending date (Ma):  
832.00

Depositional setting


Depositional pattern:  


Additional Information

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Compiler:  

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