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Chaganburgas Formation
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Chaganburgas Fm base reconstruction

Chaganburgas Fm

Period: 
Neoproterozoic

Age Interval: 
Sinian (Ediacaran), Z （14）


Province: 
Gansu

Type Locality and Naming

Middle Qilian (north-central Gansu-Qinghai border region). The Chaganburgas Fm was named by Qian Jiagi et al. in 1981. The typical section is located in Chaganburgas in Subei Mongolian Autonomous County, Gansu Province. Upper formation of the Duoruonuor Gr.

Synonym: （查干布尔嘎斯组）


Lithology and Thickness

The Chaganburgas Fm is dominantly composed of phyllite, limestone and marble, which is subdivided into three parts. Lower part is composed of dark gray thin-bedded siliceous limestone, thick-bedded siliceous marble interbedded with calcareous slate. Middle part consists of dark gray thick-bedded limestone, siliceous crystalline limestone, carbonaceous limestone intercalated with brown thin-bedded calcareous sandstone and carbonaceous slate. Upper part consists of light gray to gray phyllite, carbonaceous phyllite interbedded with thin-bedded carbonaceous limestone. The Chaganburgas Formation is with thickness from 245 to 508 m.


Lithology Pattern: 
Siliceous limestone


Relationships and Distribution

Lower contact

It overlies conformably the underlying Bianmagou Fm

Upper contact

It unconformably underlies the overlying Devonian or Upper Devonian to Lower Carboniferous.

Regional extent

Middle Qilian (north-central Gansu-Qinghai border region). It is dominantly distributed in Chaganburgas area in Subei County Subei Mongolian Autonomous County, Gansu Province.


GeoJSON

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Fossils

It yields microplants: Asperatopsophosphaera umishanensis, Margominuscula antiqua, Trachysphaeridium rugosum, T. simplex, T. rude, T planum, T. incrassatum etc.


Age 

Sinian (Ediacaran) on schematic stratigraphic column.

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
635.00

    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.