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Duoruonuor Gr

Duoruonuor Gr

Period: 
Neoproterozoic

Age Interval: 
Nanhuan-Sinian (latest Tonian-Cryogenian-Ediacaran) Nb-Z (14)


Province: 
Gansu

Type Locality and Naming

Middle Qilian (north-central Gansu-Qinghai border region). The Duoruonuor Gr was named by Qian Jiagi in 1975, and was formally published by Gansu Compiling Group for Regional Stratigraphic Scale in 1980. The typical section is situated in Hongshandaban area, Middle Qilian Mountain, Gansu Province.

Synonym: （多若诺尔群）


Lithology and Thickness

The lower part of the Duoruonuor Gr (Shibandun Fm) is dominated by volcanic rock, chert, siliceous slate, silty slate and chlorite quartz schist intercalated with sandstone. The middle part (Bianmagou Fm) consists of dolomitic clastic rock and tuffaceous sandstone. The upper part (Chaganburgas Fm) is siliceous limestone, marble intercalated with phyllite etc. The thickness is from 2052 to 2700 m.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Its lower part unconformably overlies the underlying Gongcha Gr (Qingbaikouan System).

Upper contact

The top is unconformably overlain by the Middle Devonian (or Upper Devonian to Lower Carboniferous) strata.

Regional extent

Middle Qilian (north-central Gansu-Qinghai border region). It is mainly distributed in Shulenanshan, Duoruonuor, Chaganburgas and Kaokesai areas.


GeoJSON

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Fossils

The Duoruonuor Group yields abundant microplants, especially in the Shibandun Fm


Age 

Nanhuan-Sinian (latest Tonian-Cryogenian-Ediacaran) on schematic stratigraphic column.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
776.00

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
538.80

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.