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Mesoproterozoic

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Tekes Gr

Tekes Gr

Period: 
Mesoproterozoic

Age Interval: 
Changchengian (Statherian) Ch


Province: 
Xinjiang

Type Locality and Naming

Western Middle Tianshan. The Tekes Gr was named by Tan Hongbing and Li Yingyi in 1976 and published by Tan Hongbing in 1977. The typical section is on the east bank of Koksu River valley, south of Tekes County, Xinjiang Weiwuerzhu Zizhiqu (Xinjiang Uygur Autonomous Region).

Synonym: （特克斯群）


Lithology and Thickness

The thick Lower part of the group (Toudaoqiao Fm) is composed of low-grade metamorphosed clastic rock, dominated by schist, but the thin Upper part (Machanggou Fm) is dominated by carbonate (dolomitic) rock intercalated with minor clastic rock. The Tekes Group is 3075 m thick


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

Bottom is not seen. Regionally, the next older unit is the Talati Gr (PaleoProterozoic)

Upper contact

The top is in disconformable contact with overlying Koksu Group, and locally in an unconformable contact.

Regional extent

Western Middle Tianshan. The group is distributed on Halajun Mountain, the north slope of Haleiketao Mountain, Tekes and Zhaosu counties, Xinjiang.


GeoJSON

null

Fossils

The carbonate rock bears rich stromatolites, such as Gruneria f., Kussiella f.


Age 

Shown on schematic stratigraphic column as spanning the Changchengian (Statherian)

Age Span: 

    Beginning stage: 
Statherian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,800.00

    Ending stage: 
Statherian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
1,600.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

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